Microbiotic crusts and ecosystem processes

Critical Reviews in Plant Sciences

Volumn 18, Issue 2, 1999, Pages 183-225

  Evans, R D ^a   Johansen, J R ^b  

^a UNIVERSITY OF ARKANSAS   (United States)

^b JOHN CARROLL UNIVERSITY   (United States)

Author keywords

Arid lands; Biodiversity; Carbon cycling; Ecosystem stability; Land use change; Nitrogen cycling

Indexed keywords

EID: 0032919199     PISSN: 07352689     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0735-2689(99)00384-6     Document Type: Review

References (293)

1. Aber, J. D., Nadelhoffer, K. J., Steadler, P., and Melillo, J. M. 1989. Nitrogen saturation in northern forest ecosystems: excess nitrogen from fossil fuel combustion may stress the biosphere. BioScience 39:378-386.
2. Alpert, P. and Oechel, W. C. 1985. Carbon balance limits the microdistribution of Grimmia laevigata, a desiccationtolerant plant. Ecology 66:660-669.
3. Anagnostidis, K. and Komárek, J. 1988. Modern approach to the classification system of the Cyanophytes 3: Oscillatoriales. Algological Studies 53:327-472.
4. Anagnostidis, K. and Komárek, J. 1990. Modern approach to the classification system of the Cyanophytes 5: Stigonematales. Algological Studies 59:1-73.
5. Anderson, D. C. and Rushforth, S. R. 1976. The cryptogamic flora of desert soil crusts in southern Utah. Nova Hedwigia 28:691-729.
6. Anderson, D. C., Harper, K. T., and Holmgren, R. C. 1982a. Factors influencing development of cryptogamic soil crusts in Utah deserts. J. Range Man., 35:180-185.
7. Anderson, D. C., Harper, K. T., and Rushforth, S. R. 1982b. Recovery of cryptogamic soil crusts from grazing on Utah winter ranges. J. Range Man., 35:355-359.
8. Archibald, P. A. and Bold, H. C. 1970. Phycological Studies. XI. The genus Chlorococcum Meneghini. The University of Texas Publication No. 7015.
9. Ashley, J., Rushforth, S. R., and Johansen, J. R. 1985. Soil algae of cryptogamic crusts from the Uintah Basin, Utah, U.S.A. Great Basin Naturalist 45:432-442.
10. Azevedo, M. T. and Sant'Anna, C. L. 1994a. Cyanostylon gelatinosus, a new species (Chroococcaceae, Cyanophyceae) from São Paulo State, Brazil. In: Cyanobacteria, Morphology, Taxonomy, Ecology, Toxicology: Proceedings of the 12th Symposium of the International Association for Cyanophyte Research (IAC), Sjöarp (Sweden) 1992. Cronberg, G., Skulberg, O.M., and Willen, T., Eds., Algological Studies 75:75-78.
11. Azevedo, M. T. and Sant'Anna, C. L. 1994b. Hormothece geitleriana: A new edaphic chroococcal Cyanophyceae from São Paulo State, Brazil. . In: Cyanobacteria, Morphology, Taxonomy, Ecology, Toxicology: Proceedings of the 12th Symposium of the International Association for Cyanophyte Research (IAC), Sjöarp (Sweden) 1992. Cronberg, G., Skulberg, O. M., and Willen, T., Eds., Algological Studies 75:79-83.
12. 2-concentrating mechanisms in lichens containing green algal and cyanobacterial photobionts. Planta 191:57-70.
13. Bailey, D., Mazurak, A. P. and Rosowski, J. R. 1973. Aggregation of soil particles by algae. J. Phycol. 9:99-101.
14. Baker, E. H. and Wright, R. A. 1988. Microbiology of a duneland ecosystem in southern New Mexico, U.S.A. J. Arid Environ. 15:253-259.
15. Bamforth, S. S. 1984. Microbial distributions in Arizona deserts and woodlands. Soil Biol. Biochem. 16:133-137.
16. Belnap, J. 1993. Recovery rates of cryptobiotic crusts: inoculant use and assessment methods. Great Basin Naturalist 53:89-95.
17. Belnap, J. 1995. Surface disturbances: their role in accelerating desertification. Environ. Monitor. Assess. 37:39-57.
18. Belnap, J. 1996. Soil surface disturbances in cold deserts: effects on nitrogenase activity in cyanobacterial-lichen soil crusts. Biol. Fertil. Soils 23:362-367.
19. Belnap, J. and Gardner, J. S. 1993. Soil microstructure in soils of the Colorado Plateau: the role of the cyanobacterium Microcoleus vaginatus. Great Basin Naturalist 53:40-47.
20. Belnap, J. and Gillette, D. A. 1997. Disturbance of biological soil crusts: impacts on potential wind erodibility of sandy desert soils in southeastern Utah, USA. Land Degrad. Dev. 8:355-362.
21. Belnap, J. and Gillette, D. A. 1998. Vulnerability of desert soil surfaces to wind erosion: impacts of soil texture and disturbance. J. Arid Environ. in press.
22. Belnap, J. and Harper, K. T. 1995. Influence of cryptobiotic soil crusts on elemental content of tissue of two desert seed plants. Arid Soil Res. Rehabil. 9:107-115.
23. Beymer, R. J. and Klopatek, J. M. 1991. Potential contribution of carbon by microphytic crusts in Pinyon-Juniper woodlands. Arid Soil Res. Rehabil. 5:187-198.
24. Beymer, R. J. and Klopatek, J. M. 1992. Effects of grazing on cryptogamic crusts in Pinyon-Juniper woodlands in Grand Canyon National Park. Am. Midland Naturalist 127:139-148.
25. Bilger, W., Rimke, S., Schreiber, U. and Lange, O. L. 1989. Inhibition of energy-transfer to photosystem II in lichens by dehydration: different properties of reversibility with green and blue phycobionts. J. Plant Physiol. 134:261-368.
26. Bischoff, H. W. and Bold, H. C. 1963. Phycological Studies. IV. Some soil algae from Enchanted Rock and related algal species. The University of Texas Publication No. 6318.
27. Blackburn, W. H. 1975. Factors influencing infiltration rate and sediment production of semiarid rangelands in Nevada. Water Res. Res. 11:929-937.
28. Bolton, H., Jr., Smith, J. L., and Link, S. O. 1993. Soil microbial biomass and activity of a disturbed and undisturbed shrub-steppe ecosystem. Soil Biol. Biochem. 25:545-552.
29. Bolton, H., Jr., Smith, J. L., and Wildung, R. E. 1990. Nitrogen mineralization potentials of shrubsteppe soils with different disturbance histories. Soil Sci. Soc. Am. J. 54:887-891.
30. Breuss, O. and McCune, B. 1994. Additions to the pyrenolichen flora of North America. Bryologist 97:365-370.
31. Brock, T. D. 1975. Effect of water potential on a Microcoleus (Cyanophyceae) from a desert crust. J.Phycol. 11:316-320.
32. Brooks, S. I. and Pokshishevsky, V. V. 1986. Population problems in the arid and semiarid regions of the world. In: Arid land development and the combat against desertification: an integrated approach, Gerasimov, I. P., Ed., USSR Commission for the United Nations Environment Program, Moscow.
33. Brotherson, J. D. and Rushforth, S. R. 1983. Influence of cryptogamic crusts on moisture relationships of soils in Navajo National Monument, Arizona. Great Basin Naturalist 43:73-78.
34. Brotherson, J. D., Rushforth, S. R., and Johansen, J. R. 1983. Effects of long-term grazing on cryptogam crust cover in Navajo National Monument, Ariz. J. Range Mang. 36:579-581.
35. Brown, M. C. and Bold, H. C. 1964. Phycological Studies. V. Comparative studies of the algal genera Tetracystis and Chlorococcum. The University of Texas Publication No. 6417.
36. Burris, R. H. 1974. Methodology. pp. 9-93 in Quispel, A., Ed., The Biology of Nitrogen Fixation, North-Holland, Amsterdam.
37. Buttars, S. M., St. Clair, L. L., Johansen, J. R., Sray, J. C., Payne, M. C., Webb, B. L., Terry, R. E., Pendleton, B. K., and Warren, S. D. 1998. Pelletized cyanobacterial soil amendments: laboratory testing for survival, escapability, and nitrogen fixation. Arid Soil Res. Reclam. 12(2):in press.
38. Callison, J., Brotherson, J. D., and Bowns, J. E. 1985. The effects of fire on the blackbrush (Coleogyne ramosissima) community of southwestern Utah. J. Range Mang. 38:535-538.
39. Callison, J. and Brotherson, J. D. 1985. Habitat relationships of the blackbrush community (Coleogyne ramosissima) of southwestern Utah. Great Basin Naturalist 45:321-326.
40. Camburn, K. E. 1982. Subaerial diatom communities in eastern Kentucky. Trans. Am. Microscopical Soc. 101:375-387.
41. Cameron, R. E. 1960. Communities of soil algae occurring in the Sonoran Desert in Arizona. J. Arizona Acad. Sci. 1:85-88.
42. Cameron, R. E. 1961. Algae of the Sonoran Desert in Arizona. Ph.D. Dissertation, University of Arizona, Tucson. 118 pp.
43. Cameron, R. E. 1962. Species of Nostoc Vaucher Occurring in the Sonoran Desert in Arizona. Trans. Am. Microscopical Soc. 81:379-384.
44. Cameron, R. E. 1963. Algae of southern Arizona. I. Introduction - blue green algae. Revue Algologique 6:282-318.
45. Cameron, R. E. 1964a. Algae of southern Arizona. II. Algal Flora (exclusive of bluegreen algae). Revue Algologique 7:151-177.
46. Cameron, R. E. 1964b. Terrestrial algae of southern Arizona. Trans. Am. Microscopical Soc. 83:212-218.
47. Cameron, R. E. 1969. Abundance of microflora in soils of desert regions. Jet Propulsion Laboratory Space Programs Technical Report No. 32-1378:116.
48. Cameron, R. E. 1974. A review of the Russian book Soil Algae by M. M. Gollerbakh and E. A. Shtina, including a translation of the bibliography. Phycologia 13:109-120.
49. Cameron, R. E. and Blank, G. B. 1966. Desert algae: soil crusts and diaphanous substrata as algal habitats. Jet Propulsion Laboratory Technical Report 32-971.
50. Cameron, R. E. and Fuller, W. H. 1960. Nitrogen fixation by some algae in Arizona soils. Soil Sci. Soc. Proc. 24:353-356.
51. Campbell, R. 1977. The structure and dynamics of microbial populations in soil. pp. 63-91. In: Wilkinson, J. F., Ed., Basic Microbiology, Vol. 5. John & Wiley and Sons, New York.
52. Campbell, S. E. 1979. Soil stabilization by a prokaryotic desert crust: implications for precambrian land biotia. Origins of Life 9:335-348.
53. Castenholz, R. W. 1989. Order Oscillatoriales, Order Nostocales, Order Stigonematales. In: Bergey's Manual of Systematica Bacteriology, Vol. 3. Section 19: Oxygenic photosynthetic bacteria. pp. 1771-1799. Staley, J. T., Bryant, M. P., Pfennig, N., and Holt, J. H., Eds., Williams & Wilkins, Baltimore.
54. Castenholz, R. W. 1992. Species usage, concept, and evolution in the cyanobacteria (bluegreen algae). J. Phycol. 28:737-745.
55. Castenholz, R. W. and Waterbury, J. B. 1989. Oxygenic photosynthetic bacteria. Group I. Cyanobacteria. In: Bergey's Manual of Systematic Bacteriolog, Vol. 3. Section 19: Oxygenic Photosynthetic Bacteria. pp. 1710-1728. Staley, J. T., Bryant, M. P., Pfennig, N., and Holt, J. H., Eds., Williams & Wilkins, Baltimore, Maryland.
56. Catcheside, D. G. and Stone, I. G. 1988. The mosses of the Northern Territory, Australia. J. Adelaide Botanic Gardens 11:1-17.
57. Chantanachat, S. and Bold, H. C. 1962. Phycological Studies. II. Some algae from arid soils. The University of Texas Publication No. 6218.
58. Chapin, F. S., III, Torn, M. S., and Tateno, M. 1996. Principles of ecosystem sustainability. Am. Natural. 148:1016-1037.
59. Chapin, F. S., III, Walker, B. H., Hobbs, R. J., Hooper, D. U., Lawton, J. H., Sala, O. E., and Tilman, D. 1997. Biotic control over the functioning of ecosystems. Science 277:500-504.
60. Cloudsley-Thompson, J. L. 1988. Desertification or sustainable yields from arid environments. Environ. Conservation 15:197-204.
61. Cole, D. N. 1990. Trampling disturbance and recovery of cryptogamic soil crusts in Grand Canyon National Park. Great Basin Naturalist 50:321-325.
62. Coxson, D. S. and Kershaw, K. A. 1983a. Nitrogenase activity during chinook snowmelt sequences by Nostoc commune in Stipa-Bouteloa grassland. Can. J. Microbiol. 29:938-944.
63. Coxson, D. S. and Kershaw, K. A. 1983b. Rehydration response of nitrogenase activity and carbon fixation in terrestrial Nostoc commune from Stipa-Bouteloa grassland. Canad. J. Botany 61:2658-2668.
64. Coxson, D. S. and Kershaw, K. A. 1983c. The pattern of in situ summer nitrogenase activity in terrestrial Nostoc commune from Stipa-Bouteloa grassland, southern Alberta. Can. J. Botany 61:2686-2693.
65. Deason, T. R. and Bold, H. C. 1960. Phycological Studies. I. Exploratory studies of Texas soil algae. The University of Texas Publication No. 6022.
66. Deason, T. R., Silva, P. C., Watanabe, S., and Floyd, G. L. 1991. Taxonomic status of the species of the green algal genus Neochloris. Plant System. Evol. 177:213-219.
67. Desikachary, T. V. 1959. Cyanophyta. Indian Council Agricultural Research, New Delhi.
68. 2, chlorophyll a, and light in a cyanobacterial assemblage. Appl. Environ. Microbiol. 55:882-886.
69. Dor, I. and Baldinger, I. 1994. Life history of Leptopogon galilaeus n. sp. (Stigonematales) from the shallow littoral of Lake Kinneret, Israel. In: Cyanobacteria, Morphology, Taxonomy, Ecology, Toxicology: Proceedings of the 12th Symposium of the International Association for Cyanophyte Research (IAC), Sjöarp (Sweden) 1992. Cronberg, G., Skulberg, O. M. and Willen, T., Eds., Algological Studies 75:101-109.
70. Downing, A. J. and Selkirk, P. M. 1993. Bryophytes on the calcareous soils of Mungo National Park, an arid area of southern central Australia. Great Basin Naturalist 53:13-23.
71. Drouet, F. 1968. Revision of the Classification of Oscillatoriaceae. Monographs of the Academy of Natural Sciences, Philadelphia 15:1-370.
72. Drouet, F. 1973. Revision of the Nostocaceae with Cylindrical Trichomes. Hafner Press, Macmillan, New York.
73. Drouet, F. 1978. Revision of the Nostocaceae with Constricted Trichomes. Beiheft Nova Hedwigia 57:1-258.
74. Drouet, F. 1981. Revision of the Stigonemataceae with a summary of the classification of the bluegreen algae. Beiheft Nova Hedwigia 66:1-221.
75. Drouet, F. and Daily, W. A. 1956. Revision of the coccoid Myxophyceae. Butler University Bot. Stud.12:1-218.
76. Drouet, F. and Daily, W. A. 1957. Revision of the coccoid Myxophyceae: additions and corrections. Trans. Am. Microscopical Soc. 76:219-222.
77. Dunne, J. 1989. Cryptogamic soil crusts in arid ecosystems. Rangelands 11:180-182.
78. Durrell, L. W. 1959. Algae in Colorado soils. Am. Midland Natural. 61:322-328.
79. Durrell, L. W. 1962. Algae of Death Valley. Trans. Am. Microscopical Soc. 81:267-278.
80. Eckert, R. E., Peterson, F. F., Meurisse, M. S., and Stephens, J. L. 1986. Effects of soil-surface morphology on emergence and survival of seedlings in Big Sagebrush communities. J. Range Mang. 39:414-420.
81. Egan, R. S. 1972. Catalog of the lichens of New Mexico. Bryologist 75:7-35.
82. Ehleringer, J. R., Evans, R. D., and Williams, D. 1998. Assessing sensitivity to change in desert ecosystems - a stable isotope approach. In: Stable Isotopes, in press, Griffiths, H., Ed., BIOS Scientific Publishers, Oxford.
83. Ehleringer, J. R. and Rundel, P. W. 1988. Stable Isotopes: history, units and instrumentation. In: Stable Isotopes in Ecological Research. pp. 1-15. Rundel, P. W., Ehleringer, J. R., and Nagy, K. A., Eds., Springer-Verlag, New York.
84. Eldridge, D. J. 1993a. Cryptogams, vascular plants and soil hydrological relations: some preliminary results from the semiarid woodlands of eastern Australia. Great Basin Naturalist 53:48-58.
85. Eldridge, D. J. 1993b. Cryptogam cover and soil surface condition: effects on hydrology on a semiarid woodland soil. Arid Soil Res. Rehabil. 7:203-217.
86. Eldridge, D. J. 1996. Distribution and floristics of terricolous lichens in soil crusts in arid and semi-arid New South Wales, Australia. Austr. J. Bot. 44:581-599.
87. Eldridge, D. J. 1998. Soil crust lichens and mosses on calcretedominant soils at Maralinga in arid South Australia. J. Adelaide Botanic Gardens (in press).
88. Eldridge, D. J. and Tozer, M. E. 1996. Distribution and floristics of bryophytes in soil crusts in semi-arid and arid eastern Australia. Austr. J. Bot. 44:223-247.
89. Eldridge, D. J. and Greene, R. S. B. 1994a. Microbiotic soil crusts: a review of their roles in soil and ecological processes in the rangelands of Australia. Austr. J. Soil Res. 32:389-415.
90. Eldridge, D. J. and Greene, R. S. B. 1994b. Assessment of sediment yield by splash erosion on a semi-arid soil with varying cryptogam cover. J. Arid Environ. 26:221-232.
91. Eldridge, D. J. and Kinnell, P. I. A. 1997. Assessment of erosion rates from microphyte-dominated calcareous soils under rain-impacted flow. Austr. J. Soil Res.
92. Eldridge, D. J. and Tozer, M. E. 1996. Distribution and floristics of bryophytes in soil crusts in semi-arid and arid eastern Australia. Austr.J. Bot. 44:223-247.
93. Eldridge, D. J., Tozer, M. E., and Slangen, S. 1997. Soil hydrology is independent of microphytic crust cover: Further evidence from a wooded semiarid Australian rangeland. Arid Soil Res. Rehabil. 11:113-126.
94. Elwan S. H. and Diab, A. 1976. Actinomycetes of an Arabian desert soil. Egypt. J. Bot. 19:111-114.
95. Eskew, D. L. and Ting, I. P. 1978. Nitrogen fixation by legumes and blue-green algal-lichen crusts in a Colorado Desert environment. Am. J. Bot. 65:850-856.
96. Ettl, H. and Gärtner, G. 1995. Syllabus der Boden, Luft und Flechtenalgen. Gustav Fischer Verlag, Stuttgart.
97. Evans, R. D. and Belnap, J. 1999. Long-term consequences of disturbance on nitrogen dynamics in an arid ecosystem. Ecology 80:150-160.
98. Evans, R. D. and Boyd, G. 1998. Ammonia volatilization and dark respiration by microbiotic crusts (in review).
99. 15N of soils. Oecologia 94:314-317.
100. Evans, R. D. and Ehleringer, J. R. 1994. Water and nitrogen dynamics in an arid woodland. Oecologia 99:233-242.
101. Falchini, L., Sparvoli, E., and Tomaselli, L. 1996. Effect of Nostoc (Cyanobacteria) inoculation on the structure and stability of clay soils. Biol. Fertil. Soils 23:346-352.
102. Farrar, J. F. 1976. The lichen as an ecosystem: observation and experiment. In: Lichenology: Progress and Problems, pp. 385-406. Brown, D. H., Hawksworth, D. L., and Bailey, R. H., Eds., Academic Press, New York.
103. Farrar, J. F. and Smith, D. C. 1976. Ecological physiology of the lichen Hypogymnia physodes. III. The importance of the rewetting phase. New Phytologist, 77:115-125.
104. Flechtner, V. R. Enigmatic desert soil algae. In: Enigmatic Algae from Extreme Environments. Seckbach, J. and Kluwer, E. D., Eds., Academic Publishers (in press).
105. Flechtner, V. R., Johansen, J. R., and Clark, W. H. Algal composition of microbiotic crusts from the central desert of Baja California, Mexico. Great Basin Naturalist (in press).
106. Fletcher, J. E. and Martin, W. P. 1948. Some effects of algae and molds in the rain-crust of desert soils. Ecology 29:95-100.
107. Flowers, S. 1973. Mosses: Utah and the West. Brigham Young University Press, Provo, Utah.
108. Floyd, G. L., Watanabe, S., and Deason. T. R. 1993. Comparative ultrastructure of the zoospores of eight species of Characium (Chlorophyta). Archiv für Protistenkunde 143:6373.
109. Friedl, T. 1995. Inferring taxonomic positions and testing genus level assignments in coccoid green lichen algae: a phylogenetic analysis of 18s ribosomal RNA sequences from Dictyochloropsis reticulata and from members of the genus Myrmecia (Chlorophyta, Trebouxiophyceae Cl. Nov.). J. Phycol. 3:632-639.
110. Friedl, T. and Zeltner, C. 1994. Assessing the relationships of some coccoid green lichen algae and the Microthamniales (Chlorophyta) with 18S ribosomal RNA gene sequence comparisons. J. Phycology 30:500-506.
111. Friedmann, E. I. and Galun, M. 1974. Desert algae, lichens, and fungi. In: Desert Biology. pp. 165-212. Brown, G. W., Ed., Academic Press, New York.
112. Friedmann, I., Lipkin, Y., and OcampoPaus, R. 1967. Desert algae of the Negev (Israel). Phycologia 6:185-196.
113. Garcia-Pichel, F. and Belnap, J. 1996. Microenvironments and microscale productivity of cyanobacterial desert crusts. J. Phycology 32:774-782.
114. Geitler, L. 1930-32. Cyanophyceae. Koeltz Scientific Books. Königstein, Germany.
115. Gollerbakh, M. M. and Shtina, E. A. 1969. Soil Algae. Nauka Publishing House, Leningrad (in Russian).
116. Graetz, R. D. and Tongway, D. J. 1986. Influence of grazing management on vegetation, soil structure and nutrient distribution and the infiltration of applied rainfall in a semi-arid chenopod shrubland, Austr. J. Ecol. 11:347-360.
117. Greene, R. S. B., Chartres, C. J. and Hodgkinson, K. C. 1990. The effects of fire on the soil in a degraded semi-arid woodland. I. Cryptogam cover and physical and micromorphological properties. Austr. J. Soil Res. 28:755-777.
118. Groover, R. D. and Bold, H. C. 1969. Phycological Studies. VIII. The taxonomy and comparative physiology of the Chlorosarcinales and certain other edaphic algae. The University of Texas Publication No. 6907.
119. Gutnecht, K. W. 1991. Desert crusts: irreplaceable veneer or ecological frosting? Utah Science 52(2):44-46.
120. Harper, K. T. and Marble, J. R. 1988. A role for nonvascular plants in management of arid and semiarid rangelands. In: Vegetation Science Applications for Rangeland Analysis and Management. pp. 135-169. Tueller, P. T., Ed., Kluwer Academic Publishers, Boston.
121. Harper, K. T. and Pendleton, R. L. 1993. Cyanobacteria and cyanolichens: can they enhance availability of essential minerals for higher plants? Great Basin Naturalist 53:59-72.
122. Harthill, M. P., Long., D. M., and Mishler, B. D. 1979. Preliminary list of Southern California mosses. Bryologist 82:260-267.
123. Haynes, R. J. and Sherlock, R. R. 1986. Gaseous losses of nitrogen. In: Mineral Nitrogen in the Plant-Soil System. pp. 242-302. Haynes, R. J., Eds., Academic Press, New York.
124. HernandézMariné, M. and Canals, T. 1994. Herpyzonema pulverulentum (Mastigocladaceae), a new cavernicolous atmophytic and limeincrusted cyanophyte. In: Cyanobacteria, Morphology, Taxonomy, Ecology, Toxicology: Proceedings of the 12th Symposium of the International Association for Cyanophyte Research (IAC), Sjöarp (Sweden) 1992. Cronberg, G., Skulberg, O. M., and Willen, T., Eds., Algological Studies 75:123-136.
125. Houghton, J. T., Jenkins, G. J., and Ephraums, J. J. 1990. Climate Change: the IPCC Scientific Assessment. Cambridge University Press, Cambridge.
126. Howarth, L. 1983. The ecology of perennial moss species in chenopod shrublands of Middleback Station, South Australia. B.Sc. Honours Thesis, University of Adelaide.
127. Hunt, C. D. and Durrell, L. W. 1966. Distribution of fungi and algae. U.S. Geological Survey Professional Paper 509:55-66.
128. Huss, V. A. R. and Sogin, M. L. 1990. Phylogenetic position of some Chlorella species within the Chlorococcales based upon complete smallsubunit ribosomal RNA sequences. J. Mol. Evolut.31:432-442.
129. Hyde, M. K. 1994. A vegetation survey of disused railway corridors in the mid-north region of south Australia, July-November 1992. Nature Conservation Society of South Australia.
130. Jackson, R. B. and Caldwell, M. M. 1983. The scale of nutrient heterogeneity around individual plants and its quantification with geostatistics. Ecology 74:612-614.
131. Jeffries, D. L. and Klopatek, J. M. 1987. Effects of grazing on the vegetation of the Blackbrush Association. J. Range Mang. 40:390-392.
132. Jeffries, D. L., Klopatek, J. M., Link, S. O., and Bolton, H. 1992. Acetylene reduction of cryptogamic crusts from a blackbrush community as related to resaturation and dehydration. Soil Biol. Biochem. 24:1101-1105.
133. 2 fluxes of cryptogamic crusts. I. response to resaturation. New Phytol. 125:163-173.
134. 2 fluxes of cryptogamic crusts. II. response to dehydration. New Phytol. 125:391-396.
135. Jenny, H. 1941. Factors of Soil Formation. McGraw-Hill, New York.
136. Johansen, J. R. 1993. Cryptogamic crusts of semiarid and arid lands of North America. J. Phycol. 29:140-147.
137. Johansen, J. R. and Rushforth, S. R. 1985. Cryptogamic soil crusts: seasonal variation in algal populations in the Tintic Mountains, Juab County, Utah. Great Basin Naturalist 45:14-21.
138. Johansen, J. R. and St. Clair, L. L. 1986. Cryptogamic soil crusts: recovery from grazing near Camp Floyd State Park, Utah, USA. Great Basin Naturalist 46:632-640.
139. Johansen, J. R., Ashley, J., and Rayburn, W. R. 1993. Effects of rangefire on soil algal crusts in semiarid shrub-steppe of the lower Columbia basin and their subsequent recovery. Great Basin Naturalist 53:73-88.
140. Johansen, J. R., Javakul, A., and Rushforth, S. R. 1982. Effects of burning on the algal communities of a high desert soil near Wallsburg, Utah. J. Range Mang. 35:598-600.
141. Johansen, J. R., Rushforth, S. R., and Brotherson, J. D. 1981. Subaerial algae of Navajo National Monument, Arizona. Great Basin Naturalist 41: 433-439.
142. Johansen, J. R., St. Clair, L. L., Webb, B. L., and Nebeker, G. T. 1984. Recovery patterns of cryptogame soil crusts in desert rangelands following fire disturbance. The Bryologist 87:238-243.
143. Kasper, K. A. 1994. The effects of rangefire and trampling upon algal soil crusts of a greasewood community in the West Desert of Utah. M.S. Thesis, John Carroll University, University Heights, Ohio,.
144. Kassas, M. 1995. Desertification: a general review. J. Arid Environ. 30:115-128.
145. Kates, R. W., Turner, B. L., and Clark, W. C. 1990. The great transformation. In: The Earth as Transformed by Human Action: Global and Regional Changes in the Biosphere Over the Past 300 Years. pp. 1-17. Turner, B. L., Ed., Cambridge, New York.
146. Kershaw, K. A. 1985. Physiological Ecology of Lichens. Cambridge University Press, New York.
147. Kieft, T. L. 1991. Soil microbiology in reclamation of arid and semiarid lands. In: Semiarid Lands and Deserts: Soil Resource and Reclamation. pp. 209-256. Skujins, J., Ed., Marcel Decker, New York.
148. Killian, C. and Feher, D. 1935. Recherches sur les phénomènes microbiologiques des sols sahariens. Ann. Inst. Pasteur 55:573-623.
149. Killian, C. and Feher, D. 1938. Le rôle et l'importance de l'exploration microbiologique des sols sahariens. In: La Vie dans la Region Desertique Nordtropicale de l'Ancien Monde. pp. 81-106. Société de Biogeographie, Paris.
150. Killian, C. and Feher, D. 1939. Recherches sur la microbiologie des sols désertiques. Encycl. Biol. (Paris).
151. Kinzig, A. P. and Socolow, R. H. 1994. Human impacts on the nitrogen cycle. Physics Today 4: 24-31.
152. Kleiner, E. F. 1983. Successional trends in an ungrazed, arid grassland over a decade. J. Range Mang. 36:114-118.
153. Kleiner, E. F. and Harper, K. T. 1972. Environment and community organization in grasslands of Canyonlands National Park. Ecology 53:299-309.
154. Kleiner, E. F. and Harper, K. T. 1977. Soil properties in relation to cryptogamic groundcover in Canyonlands National Park. J. Range Mang. 30:202-205.
155. 2-fixation in arid soil crusts. Soil Biol. Biochem. 12:229-236.
156. Klubek, B., Eberhardt, P. J., and Skujins, J. 1978. Ammonia volatilization from Great Basin Desert soils. In: Nitrogen in Desert Ecosystems. pp. 107-129. West, N. E. and Skujins, J. J., Eds., Dowden, Hutchinson and Ross, Inc, Stroudsburg.
157. Knutsen, G. and Metting, B. 1991. Microalgal mass culture and forced development of biological crusts in arid lands. In: Semiarid Lands and Deserts: Soil Resource and Reclamation. pp. 487-506. Skujins, J., Eds., Marcel Dekker, New York.
158. Koch, G. W. and Mooney, H. A. 1996. Carbon Dioxide and Terrestrial Ecosystems. Academic Press, New York.
159. Komárek, J. 1994a. Current trends and species delimitation in the cyanoprokaryote taxonomy. In: Cyanobacteria, Morphology, Taxonomy, Ecology, Toxicology: Proceedings of the 12th Symposium of the International Association for Cyanophyte Research (IAC), Sjöarp (Sweden) 1992. Cronberg, G., Skulberg, O. M., and Willen, T., Eds., Algological Studies 75:11-29.
160. Komárek, J. 1994b. Microchaete robinsonii sp. nov., a new heteropolar cyanoprokaryote (cyanophyte, cyanobacterium) from southern Manitoba, Canada. Can. J. Bot. 72:597-600.
161. Komárek, J. and Anagnostidis, K. 1986. Modern approach to the classification system of cyanophytes. II. Chroococcales. Algological Studies 43: 157-226.
162. Komárek, J. and Anagnostidis, K. 1989. Modern approach to the classification system of cyanophytes. IV. Nostocales Algological Studies 56: 247-345.
163. Komárek, J. and Fott, B. 1983. Chlorococcales. In: Das Phytoplankton des Süßwassers, Volume 7. pp. 11043. HuberPestalozzi, G., Ed., Schweizerbart, Stuttgart.
164. 2 exchange of lichens. I. influence of temperature on moisture-dependent net photosynthesis and dark respiration in Ramalina maciformis. Oecologia 45:82-87.
165. Lange, O. L. 1988. Ecophysiology of photosynthesis: performance of poikilohydric lichens and homoiohydric Mediterranean sclerophylls. J. Ecol. 76:915-937.
166. 2 exchange. Flora 192:1-15.
167. Lange, O. L., Büdel, B., Meyer, A., and Kilian, E. 1993. Further evidence that activation of net photosynthesis by dry cyanobacterial lichens requires liquid water. Lichenologist 25:175-189.
168. Lange, O. L., Green, T. G. A., and Ziegler, H. 1988. Water status related photosynthesis and carbon isotope discrimination in species of the lichen genus Pseudocyphellaria with green or blue-green photobionts and in photosymbiodemes. Oecologia 75:494-501.
169. Lange, O. L., Kidron, G. J., Büdel, B., Meyer, A., Kilian, E., and Abeliovich, A. 1992. Taxonomic composition and photosynthetic characteristics of the 'biological soil crusts' covering sand dunes in the western Negev Desert. Functi. Ecol. 6:519-527.
170. Lange, O. L., Kilian, E., and Ziegler, H. 1986. Water vapor uptake and photosynthesis of lichens: performance differences in species with green and blue-green algae as phycobionts. Oecologia 71:104-110.
171. Lange, O. L., Meyer, A., and Büdel, B. 1994a. Net photosynthesis activation of a desiccated cyanobacterium without liquid water in high air humidity alone. Experiments with Microleus sociatus isolated from a desert soil crusts. Funct. Ecol. 8:52-57.
172. Lange, O. L., Meyer, A., Ullmann, I., and Zellner, H. 1991. Microclimate conditions, water content and photosynthesis of lichens in the coastal fog zone of the Namib Desert: measurements in the fall. Flora 185:233-266.
173. Lange, O. L., Meyer, A., Zellner, H., and Heber, U. 1994b. Photosynthesis and water relations of lichen soil crusts: field measurements in the coastal fog zone of the Namib Desert. Funct. Ecol. 8:253-254.
174. Lange, O. L., Meyer, A., Zellner, H., Ullmann, I., and Wessels, D. C. J. 1990. Eight days in the life of a desert lichen: water relations and photosynthesis of Teloschistes capensis in the coastal fog zone of the Namib Desert. Madoqua 17:17-30.
175. 2 exchange of lichens. Laboratory experiments with soil crusts species from local xerothermic steppe formations in Franconia, Germany. In: Contributions to Lichenology in Honour of Gerhard Follman. pp. 139-153. Daniels, F. J. A., Schulz, M., and Peine, J., Eds., University of Cologne, Cologne.
176. 2 gas exchange and water metabolism of crustose and foliose lichens in their natural habitat during the summer dry period. Flora 159:525-538.
177. 2 exchange of lichens. II. depression of net photosynthesis in Ramalina maciformis at high water content is caused by increased thallus carbon dioxide diffusion resistance. Oecologia 51:426-429.
178. Lange, O. L. and Tenhunen, J. D. 1982. Water relations and photosynthesis of desert lichens. J. Hattori Botan. Lab. 53:309-313.
179. Lange, O. L. and Ziegler, H. 1986. Different limiting processes of photosynthesis in lichens. In: Biological Control of Photosynthesis. Adaptation, Lichens and Mosses, Resurrection Plants, Ferns. Vol. 147-161, Marcelle, R., Clijsters, H. and Van Poucke, M., Eds., Martinus Nijhoff, Dordrecht.
180. Lange, W. 1974. Chelating agents and bluegreen algae. Canadian Journal of Microbiology 20:1311-1321.
181. Lange, W. 1976. Speculations on a possible essential function of the gelatinous sheath of bluegreen algae. Can. J. Microbiol 22:1181-1185.
182. Lesica, P. and Shelly, S. J. 1992. Effects of cryptogamic soil crust on the population dynamics of Arabis fecunda (Brassicaceae). Am. Midland Naturalist 128:53-60.
183. Lewis, L. A. 1997. Diversity and phylogenetic placement of Bracteacoccus Tereg (Chlorophyceae, Chlorophyta) based on 18S ribosomal RNA gene sequence data. J. Phycol 33:279-285.
184. Lewis, L. A., Wilcox, L. W., Fuerst, P. A., and Floyd, G. L. 1992. Concordance of molecular and ultrastructural data in the study of zoosporic chlorococcalean green algae. J. Phycol. 28:375-380.
185. Loope, W. L. and Gifford, G. F. 1972. Influence of a soil microfloral crust on select properties of soils under pinyon-juniper in southeastern Utah. J. Soil Water Conservation 27:164-167.
186. Lubchenco, J. 1991. The sustainable biosphere initiative - an ecological research agenda - a report from the Ecological Society of America. Ecology 72:371-412.
187. MacFarlane, J. D., Maikawa, E., Kershaw, K. A., and Oaks, A. 1976. Environmental-physiological interactions in lichens. I. The interaction of light/dark periods and nitrogenase activity in Peltigera polydactyla. New Phytol. 77:705-711.
188. Macgregor, A. N. and Johnson, D. E. 1971. Capacity of desert algal crusts to fix atmospheric nitrogen. Soil Sci. Soc. Am. Proc. 35:843-844.
189. Mack, R. N. and Thompson, J. N. 1982. Evolution in steppe with few large, hooved mammals. American Naturalist 119:757-773.
190. Magill, R. E. 1982. Bryophytes of the southwestern United States. In: pp. 461-465. Bryophyte Taxonomy. pp. 461-465. Geissler, P., and Greene, S. W., Eds., Nova Hedwigia, Beiheft 71:461-465.
191. 2-concentrating mechanisms and diffusion limitation. Planta 196:95-102.
192. Máguas, C., Griffiths, H., Ehleringer, J., and Serôdio, J.
193. Mayland, H. F. and McIntosh, T. H. 1966. Availability of biologically fixed atmospheric nitrogen-15 to higher plants. Nature 209:421-422.
194. Mayland, H. F., McIntosh, T. H., and Fuller, W. H. 1966. Fixation of isotopic nitrogen on a semiarid soil by algal crust organisms. Soil Sci. Soc. Am. Proc. 30:56-60.
195. McKenna-Neuman, C., Maxwell, C. D., and Boulton, J. W. 1996. Wind transport of sand surfaces crusted with photoautotrophic microorganisms. Catena 27:229-247.
196. Melillo, J. M., McGuire, A. D., Kicklighter, D. W., Moore, B., III, Vorosmarty, C. J., and Schloss, A. L. 1993. Global climate change and terrestrial net primary production. Nature 363:234-240.
197. Melkonian, M. 1978. Structure and significance of cruciate flagellar root systems in green algae: comparative investigations in species of Chlorosarcinopsis (Chlorosarcinales). Plant Syst. Evol. 130:265-292.
198. Metting, B. 1991. Biological surface features of semiarid lands and deserts. In: Semiarid Lands and Deserts: Soil Resource and Reclamation. Skujins, J, Ed., pp. 257-293. Marcel Dekker, New York.
199. Mishler, B. D. 1994. Tortula. In: Sharp, A., Crum, H., and Eckel, P., Eds., The Moss Flora of Mexico, Pt. 1. Mem. N. Y. Bot. Gar. 69:319-350.
200. Mishler, B. D. and Oliver, M. J. 1991. Gametophytic phenology of Tortula ruralis, a desiccationtolerant moss, in the Organ Mountains of Southern New Mexico. Bryologist 94:143-153.
201. Mollenhauer, D., Büdel, B., and Mollenhauer, R. Approaches to species delimitations in the genus Nostoc Vaucher 1803 ex Bornet et Flahault 1888. In: Cyanobacteria, Morphology, Taxonomy, Ecology, Toxicology. Cronberg, G., Skulberg, O. M., and Willen, T., Eds., Proceedings of the 12th Symposium of the International Association for Cyanophyte Research (IAC), Sjöarp (Sweden) 1992. Analogical Studies 75:189-209.
202. Nakayama, T., Watanabe, S., Mitsui, K., Uchida, H., and Inouye, I. 1996. The phylogenetic relationships between the Chlamydomonadales and Chlorococcales inferred from 18S rDNA sequence data. Phycol. Res. 44:47-56.
203. Nash, T. H., III. and Johnson, A. B. 1975. Catalog of the lichens of Arizona. Bryologist 78:7-24.
204. Nash, T.H., III., White, S. L., and Marsh, J. E. 1977. Lichen and moss distribution and biomass in hot desert ecosystems. Bryologist 80:470-479.
205. Newberry, C. C. 1991. Lichens of the Uinta Mountains and adjacent intermountain North America. Master's Thesis, Brigham Young University, Provo, Utah.
206. NovichkovaIvanova, L. N. 1980. Soil Algae of the SaharaGobi Desert Region. Nauka Publishing House, Leningrad (in Russian).
207. Noy-Meir, E. 1979. Structure and function of desert ecosystems. Israel J. Bot. 28:1-19.
208. 2-concentrating mechanism. Planta 191:48-56.
209. 2 in lichen photobionts. Symbiosis 18:95-109.
210. 2 concentrating mechanism in cyanobacterial lichens. Cryptogamic Bot. 4:218-226.
211. Peterjohn, W. T. and Schlesinger, W. H. 1991. Factors controlling denitrification in a Chihuahuan Desert ecosystem. Soil Sci. Soci. Am. J. 55:1694-1701.
212. Petersen, J. B. 1935. Studies on the biology and taxonomy of soil algae. Danske Botanisk Arkiv 8(9):1-180.
213. Proctor, M. C. F., Raven, J. A., and Rice, S. K. 1992. Stable carbon isotope discrimination measurements in Sphagnum and other bryophytes: physiological and ecological implications. J. Bryol 17:193-202.
214. Rajvanshi, V., St. Clair, L. L., Webb, B. L., and Newberry, C. C. The terricolous lichen flora of the San Rafael Swell, Emery County, Utah, U.S.A. Bryologist. (in press).
215. Ramsey, H. P. 1984. Census of New South Wales mosses. Telopea 2:455-534.
216. Rao, A. V. and Venkateswarlu, B. 1983. Microbial ecology of the soils of the Indian desert. Agric. Ecosyst. Environ. 10:361-369.
217. Raven, J. A. 1991. Implications of inorganic carbon utilization: ecology, evolution and geochemistry. Can. J. Bot. 69:908-924.
218. Rayburn, W. R., Mack, R. N., and Metting, B. 1982. Conspicuous algal colonization of the ash from Mount St. Helens. J. Phycol. 18:537-543.
219. Redon, J. and Lange, O. L. 1983. Epiphytic lichens in the region of a Chilean "Fog Oasis" (Fray Jorge). I. Distributional patterns and habitat conditions. Flora 174:213-243.
220. Rippka, R., Deruelles, J., Waterbury, J., Herdman, M., and Stanier, R. 1979. Generic assignments, strain histories and properties of pure cultures of cyanobacteria. J. Gen. Microbiol. 111:1-61.
221. Rogers, R. W. and Lange, R. T. 1971. Lichen populations on arid soil crusts around sheep watering places in South Australia. Oikos 22:93-100.
222. Rosentretter, R. 1993. Vagrant lichens of North America. Bryologist 96:333-338.
223. Rosentretter, R. 1997. Conservation and management of vagrant lichens in the Northern Great Basin, USA. In: Conservation and Management of Native Plants and Fungi. pp. 242-248. Kaye, T. N., Liston, A., Love, R. M., Luoma, D. L., Meinke, R. J., and Wilson, M. V., Eds., Native Plant Society of Oregon, Corvallis, Oregon.
224. Rosentretter, R. and McCune, B. 1992. Vagrant Dermatocarpon in western North America. Bryologist 95:15-19.
225. Rundel, P. W. and Lange, O. L. 1980. Water relations and photosynthetic response of a desert moss. Flora 169:329-335.
226. Rundel, P. W., Stichler, W., Zander, R. H., and Ziegler, H. 1979. Carbon and hydrogen isotope ratios of bryophytes from arid and humid regions. Oecologia 44:91-94.
227. Rychert, R., Skujins, J., Sorensen, D., and Porcella, D. 1978. Nitrogen fixation by lichens and free-living microorganisms in deserts. In: Nitrogen in Desert Ecosystems. pp. 20-30. West, N. E. and Skujins, J. J., Eds., Dowden, Hutchinson and Ross, Inc., Stroudsburg.
228. Rychert, R. C. and Skujins, J. 1974. Nitrogen fixation by blue-green algae-lichen crusts in the Great Basin Desert. Soil Sci. Soc. Am. Proc. 38:768-771.
229. Schlesinger, W. H. and Peterjohn, W. T. 1991. Processes controlling ammonia volatilization from Chihuahuan Desert soils. Soil Biol. Biochem. 23:637-642.
230. Schlesinger, W. H., Raikes, J. A., Hartley, A. E., and Cross, A. E. 1996. On the spatial pattern of soil nutrients in desert ecosystems. Ecology 77:364-374.
231. Schlesinger, W. H., Reynolds, J. F., Cunningham, G. L., Heunneke, L. F., Jarrell, W. M., Virginia, R. A., and Whitford, W. G. 1990. Biological feedbacks in global desertification. Science 247:1043-1048.
232. Schroeder, N. E., Schroeder, J. G., and Anderegg, D. E. 1975. Catalog of the lichens of Idaho. Bryologist 78:32-43.
233. Schulten, J. A. 1985. Soil aggregation by cryptogams of a sand prairie. Am. J. Bot. 72:1657-1661.
234. Schulze, E-D. 1989. Air pollution and forest decline in a spruce (Picea abies) forest. Science 244:776-783.
235. Scott, G. A. M. 1982. Desert bryophytes. In: Bryophyte Ecology. pp. 105-122. Smith, A. J. E., Eds., Chapman and Hall, London.
236. Shachak, M., Pickett, S. T. A., Boeken, B., and Zaady, E. Managing patchiness, ecological flows, productivity and diversity in the Negev Desert. In: Management of Dry Lands - Toward Ecological Sustainability. Hoekstra, T. and Shachak, M., Eds. (in press).
237. Shields, L. M. and Durrell, L. W. 1964. Algae in relation to soil fertility. Bot. Rev. 30:92-128.
238. Shields, L. M. and Drouet, F. 1962. Distribution of terrestrial algae within the Nevada Test Site. Am J. Bot. 49:547-554.
239. Shields, L. M., Mitchell, C., and Drouet, F. 1957. Alga- and lichen-stabilized surface crusts as soil nitrogen sources. Am.J. Bot. 44:489-498.
240. Shushan, S. and Anderson, R. A. 1969. Catalog of the lichens of Colorado. Bryologist 72:451-483.
241. Skujins, J. 1984. Microbial ecology of desert soils. Adv. Microbial Ecol. 7:49-92.
242. 2-concentrating mechanism and carbon isotope discrimination in lichens and bryophytes. Planta 198:6-16.
243. Snyder, J. M. and Wullstein, L. H. 1973. The role of desert cryptogams in nitrogen fixation. Am. Midland Naturalist 90:257-265.
244. Spence, J. R. 1988. Checklist of the mosses of the Intermountain West, USA. Great Basin Naturalist 48:394-401.
245. St. Clair, L. L. and Johansen, J. R. 1993. Introduction to the symposium on soil crust communities. Great Basin Naturalist, 53:1-4.
246. St. Clair, L. L., Johansen, J. R., and Rushforth, S. R. 1993. Lichens of soil crust communities in the Intermountain Area of the western United States. Great Basin Naturalist 53:5-12.
247. St. Clair, L. L., Johansen, J. R., and Webb, B. L. 1986. Rapid stabilization of firedisturbed sites using a soil crust slurry: inoculation studies. Reclam. Reveget. Res. 4:261-269.
248. St. Clair, L. L. and Newberry, C. C. 1991. Preliminary lichen biomonitoring program and air quality baseline in Selected Class I Wilderness areas of Coronado, Coconino, Kiabab, Prescott, and Tonto National Forests Arizona. Final Report, Chiricahua Wilderness Area, National Forest Service.
249. St. Clair, L. L. and Warrick, R. B. 1987. Acarospora nodulosa (Duf.) Hue. var. nodulosa: a new record for North America. Bryologist 90:48-49.
250. St. Clair, L. L., Webb, B. L., Johansen, J. R., and Nebeker, G. T. 1984. Cryptogamic soil crusts: enhancement of seedling establishment in disturbed and undisturbed areas. Reclam. Reveget. Res. 3:129-136.
251. Stal, L. J. 1995. Physiological ecology of cyanobacteria in microbial mats and other communities. New Phytol. 131:1-32.
252. Stark, L. R. 1996. The status of Weissia sweetii, a species endemic to the southwestern United States. Bryologist 99:345-348.
253. Stark, L. R. 1997. Phenology and reproductive biology of Syntrichia inermis (Bryopsida, Pottiaceae) in the Mojave Desert. Bryologist 100:13-27.
254. Stark, L. R. and Castetter, R. C. 1987. A gradient analysis of bryophyte populations in a desert mountain range. Mem. N.Y. Botan. Garden 45:186-197.
255. Stark, L. R. and Castetter, R. C. 1995. Phenology of Trichostomum perligulatum (Pottiaceae, Bryopsida) in the Chihuahuan Desert. Bryologist 98: 389-397.
256. 2 fixation: A strategy for meeting nitrogen requirements of marine and terrestrial cyanobacterial mats. FEMS Microbiol. Ecol. 21:149-156.
257. Stewart, W. D. P. 1967. Transfer of biologically fixed nitrogen in a sand dune slack region. Nature 214:603-604.
258. Stoermer, E. F. 1962. Notes on Iowa diatoms. II. Species distribution in a subaerial habitat. Iowa Acad. Sci. Proc. 69:87-91.
259. Stoneburner, A. 1985. Variation and taxonomy of Weissia in the southwestern United States. II. Taxonomic treatment. Bryologist 88:293-314.
260. Stoneburner, A. and Wyatt, R. 1985. Variation and taxonomy of Weissia in the southwestern United States. I. Biometrical analyses. Monogr. Syst. Bot.. Miss.Botanical Garden 11:175-185.
261. Stoneburner, A., Wyatt, R., Catcheside, D. G., and Stone, I. G. 1993. Census of the mosses of western Australia. Bryologist 96:86-101.
262. Teeri, J. A. 1981. Stable carbon isotope analysis of mosses and lichens growing in xeric and moist habitats. Bryologist, 84:82-84.
263. Thomson, J. W. 1987. The lichen genera Catapyreneum and Placidiopsis in North America. Bryologist 90:27-39.
264. Thomson, J. W. 1989. Additions and a revised key to Catapyreneum in North America. Bryologist 92:190-193.
265. Timdal, E. 1986. A revision of Psora (Lecideaceae) in North America. Bryologist 89:253-275.
266. Timdal, E. 1990. Gypsoplacaceae and Gypsoplaca, a new family and genus of squamiform lichens. Bibliotheca Lichenologica 38:419-427.
267. Verstraete, M. M. and Schwartz, S. A. 1991. Desertification and global change. Vegetatio 91:3-13.
268. Virginia, R. A., Jarrell, W. M., and Franco-Vizcaino, E. 1982. Direct measurement of denitrification in a Prosopis (Mesquite) dominated Sonoran Desert ecosystem. Oecologia 53:120-122.
269. Vitousek, P. M. 1994. Beyond global warming: ecology and global change. Ecology 75:1861-1876.
270. Vitousek, P. M., Aber, J. D., Howarth, R. W., Likens, G. E., Matson, P. A., Schindler, D. W., Schlesinger, W. H., and Tilman, D. G. 1997. Human alteration of the global nitrogen cycle: Sources and consequences. Ecol.Appl. 7:737-750.
271. Vitousek, P. M., Mooney, H. A., Lubchenco, J., and Melillo, J. M. 1997. Human domination of Earth's ecosystems. Science 277:494-499.
272. Vollmer, A. T., Au, F., and Bamberg, S. A. 1977. Observations on the distribution of microorganisms in desert soil. Great Basin Naturalist 37:81-86.
273. Watanabe, S. and Floyd, G. L. 1989. Comparative ultrastructure of the zoospores of nine species of Neochloris (Chlorophyta). Plant Syst. Evol. 168:195-219.
274. Watanabe, S. and Floyd, G. L. Considerations on the Systematics of Coccoid Green Algae and Related Organisms Based on the Ultrastructure of Swarmers. SPB Academic Publishing, Amsterdam, The Netherlands (in press).
275. Waterbury, J. B. 1989. Order Pleurocapsales Geitler 1925, emend. Waterbury and Stanier 1978. In: Bergey's Manual of Systematica Bacteriology, Vol. 3. Section 19. pp. 1746-1770. Oxygenic Photosynthetic Bacteria, Staley, J. T., Bryant, M. P., Pfennig, N., and Holt, J. H., Eds., Williams & Wilkins, Baltimore.
276. Waterbury, J. B. and Rippka, R. 1989. Order Chroococcales Wettstein 1924, emend. Rippka, et al., 1979. In: Bergey's Manual of Systematica Bacteriology, Vol. 3. Section 19. pp. 1728-1746. Oxygenic Phototsynthetic Bacteria, Staley, J. T., Bryant, M. P., Pfennig, N., and Holt, J. H., Eds., Williams & Wilkins, Baltimore.
277. Weber, W. A. 1973. Guide to the mosses of Colorado. Occasional Papers of the Institute of Arctic Alpine Research 6.
278. West, N. E. 1990. Structure and function of microphytic soil crusts in wildland ecosystems of arid to semi-arid regions. Adv. Ecol. Res. 20:179-223.
279. West, N. E. and Skujins, J. 1977. The nitrogen cycle in North American cold-winter semi-desert ecosystems. Ecologia Plantarum 12:45-53.
280. Westerman, R. L. and Tucker, T. C. 1979. In situ transformations of Nitrogen-15 labeled materials in Sonoran Desert soils. Soil Sci. Soc. Am. J. 43:95-100.
281. Wheeler, C. C., Flechtner, V. R., and Johansen, J. R. 1993. Microbial spatial heterogeneity in microbiotic crusts in Colorado National Monument. II. Bacteria. Great Basin Naturalist 53:31-39.
282. Wilcox, L. W., Lewis, L. A., Fuerst, P. A., and Floyd, G. L. 1992. Assessing the relationships of autosporic and zoosporic chlorococcalean green algae with 18s rDNA sequence data. J. Phycol. 28:381-386.
283. Williams, J. D., Dobrowolski, J. P., and West, N. E. 1995b. Microphytic crust influence on interrill erosion and infiltration capacity. Trans. Am. Soc. Agric. Eng. 38:139-146.
284. Williams, J. D., Dobrowolski, J. P., West, N. E., and Gillette, D. A. 1995a. Microphytic crust influence on wind erosion. Trans. Am. Soc. Agric. Eng. 38:131-137.
285. Willis, J. H. 1970. The vegetation of Hattah Lakes National Park. Australia National Parks Authority, Victoria.
286. Wilmotte, A. and Golubic, S. 1991. Morphological and genetic criteria in the taxonomy of Cyanophyta/Cyanobacteria. Algological Studies 64:1-24.
287. Yair, A. 1990. Runoff generation in a sandy area - the Nizzana sands, western Negev, Israel. Earth Surface Processes and Landforms 15:597-609.
288. Yair, A. and Lavee, H. 1982. Factors affecting the spatial variability of runoff generation over arid hillsides, Southern Israel. Israel J. Earth Sci. 31:133-143.
289. Yair, A. and Shachak, M. 1987. Studies in watershed ecology of an arid area. In: Progress in Desert Research. pp. 145-193. Berkofsky, L. and Wurtele, M. G., Eds., Rowman and Littlefield, Totowa, New Jersey.
290. Zaady, E., Groffman, P. M., and Shachak, M. 1996. Litter as a regulator of N and C dynamics in macrophytic patches in Negev desert soils. Soil Biol. Biochem. 28:39-46.
291. Zaady, E., Gutterman, Y., and Boeken, B. 1997. The germination of mucilaginous seeds of Plantago coronopus, Reboudia pinnala, and Carrichtera annua on cyanobacterial soil crust from the Negev Desert.
292. Zander, R. H. 1993. Genera of the Pottiaceae: mosses of harsh environments. Bull. Buffalo Society of Nat. Sci. 32:1-378.
293. Zander, R. H., Stark, L. R., and MarrsSmith, G. 1995. Didymodon nevadensis, a new species for North America, with comments on phenology. Bryologist 98:590-595.