Movement strategies of seed predators as determinants of plant recruitment patterns

American Naturalist

Volumn 172, Issue 5, 2008, Pages 694-711

  Mari, Lorenzo ^a   Casagrandi, Renato ^a   Gatto, Marino ^a   Avgar, Tal ^b,c   Nathan, Ran ^b  

^a POLITECNICO DI MILANO   (Italy)

^b HEBREW UNIVERSITY OF JERUSALEM   (Israel)

^c UNIVERSITY OF GUELPH   (Canada)

Author keywords

Foraging behavior; Ideal free distribution; Janzen connell effect; Partial differential equations model; Postdispersal seed predation

Indexed keywords

ABUNDANCE; COMPARATIVE STUDY; CONSPECIFIC; ECOLOGICAL MODELING; ENVIRONMENTAL CUE; IDEAL FREE DISTRIBUTION; MOVEMENT; RECRUITMENT (POPULATION DYNAMICS); SEED DISPERSAL; SEED PREDATION;

ANIMAL; ARTICLE; BIOLOGICAL MODEL; FEEDING BEHAVIOR; GROWTH, DEVELOPMENT AND AGING; PHYSIOLOGY; PLANT; PLANT SEED; POPULATION DYNAMICS;

ANIMALS; FEEDING BEHAVIOR; MODELS, BIOLOGICAL; PLANTS; POPULATION DYNAMICS; SEEDS;

EID: 54349096366     PISSN: 00030147     EISSN: None     Source Type: Journal    
DOI: 10.1086/591687     Document Type: Article

References (146)

1. Abrahams, M. V. 1986. Patch choice under perceptual constraints: a cause for departures from an ideal free distribution. Behavioral Ecology and Sociobiology 19:409-415.
2. Adler, F. R., and H. C. Muller-Landau. 2005. When do localized natural enemies increase species richness? Ecology Letters 8:438-447.
3. Andersson, M. 1981. Central place foraging in the whinchat (Saxicola rubetra). Ecology 62:528-544.
4. Armsworth, P. R., and J. E. Roughgarden. 2005. The impact of directed versus random movement on population dynamics and biodiversity patterns. American Naturalist 165:449-465.
5. Augspurger, C. K. 1983a. Offspring recruitment around tropical trees: changes in cohort distance with time. Oikos 40:189-196.
6. _. 1983b. Seed dispersal of the tropical tree, Platypodium elegans, and the escape of its seedlings from fungal pathogens. Journal of Ecology 71:759-771.
7. _. 1984. Seedling survival of tropical tree species: interactions of dispersal distance, light-gaps, and pathogens. Ecology 65:1705-1712.
8. Augspurger, C. K., and K. Kitajima. 1992. Experimental studies of seedling recruitment from contrasting seed distributions. Ecology 73:1270-1284.
9. Avgar, T., I. Giladi, and R. Nathan. 2008. Linking traits of foraging animals to spatial patterns of plants: social and solitary ants generate opposing patterns of surviving seeds. Ecology Letters 11:224-234.
10. Barone, J. A. 2000. Comparison of herbivores and herbivory in the canopy and understory for two tropical tree species. Biotropica 32:307-317.
11. Barot, S., G. Ginoux, and J. Menaut. 1999. Seed shadow, survival and recruitment: how simple mechanisms lead to dynamics of population recruitment curves. Oikos 86:320-330.
12. Bautista, L. M., J. C. Alonso, and J. A. Alonso. 1995. A field test of ideal free distribution in flock-feeding common cranes. Journal of Animal Ecology 64:747-757.
13. Beauchamp, G., M. Belisle, and L.-A. Giraldeau. 1997. Influence of conspecific attraction on the spatial distribution of learning foragers in a patchy habitat. Journal of Animal Ecology 66:671-682.
14. Berg, H. C. 1993. Random walks in biology. Princeton University Press, Princeton, NJ.
15. Bonanomi, G., M. Rietkerk, S. C. Dekker, and S. Mazzoleni. 2008. Islands of fertility induce co-occurring negative and positive plant-soil feedbacks promoting coexistence. Plant Ecology 197:207-218.
16. Boudreau, S., and M. J. Lawes. 2008. Density- and distance-dependent seedling survival in a ballistically dispersed subtropical tree species Philenoptera sutherlandii. Journal of Tropical Ecology 24:1-8.
17. Buckley, N. J. 1996. Food finding and the influence of information, local enhancement, and communal roosting on foraging success of North American vultures. Auk 113:473-488.
18. _. 1997. Spatial-concentration effects and the importance of local enhancement in the evolution of colonial breeding in seabirds. American Naturalist 149:1091-1112.
19. Burkey, T. V. 1994. Tropical tree species diversity: a test of the Janzen-Connell model. Oecologia (Berlin) 97:533-540.
20. Busher, P. E. 1996. Food caching behavior of beavers (Castor canadensis): selection and use of woody species. American Midland Naturalist 135:343-348.
21. Cartar, R. V., and M. V. Abrahams. 1997. Predicting the distribution of organisms among a few patches: problems with detecting departures from the ideal free distribution. Oikos 78:388-393.
22. Clark, D. A., and D. B. Clark. 1984. Spacing dynamics of a tropical rain forest tree: evaluation of the Janzen-Connell model. American Naturalist 124:769-788.
23. Clark, J. S., E. Macklin, and L. Wood. 1998. Stages and spatial scales of recruitment limitation in southern Appalachian forests. Ecological Monographs 68:213-235.
24. Clark, J. S., M. Silman, R. Kern, E. Macklin, and J. HilleRisLambers. 1999. Seed dispersal near and far: patterns across temperate and tropical forests. Ecology 80:1475-1494.
25. Clode, D. 1993. Colonially breeding seabirds: predators or prey? Trends in Ecology & Evolution 8:336-338.
26. Condit, R., S. P. Hubbell, and R. B. Foster. 1992. Recruitment near conspecific adults and the maintenance of tree and shrub diversity in a Neotropical forest. American Naturalist 140:261-286.
27. Connell, J. H. 1971. On the role of natural enemies in preventing competitive exclusion in some marine animals and in rain forest trees. Pages 298-312 in P. J. D. Boer and G. R. Gradwel, eds. Dynamics of populations. Pudoc Scientific, Wageningen, Netherlands.
28. Connell, J. H., J. G. Tracey, and L. J. Webb. 1984. Compensatory recruitment, growth, and mortality as factors maintaining rain forest tree diversity. Ecological Monographs 54:141-164.
29. Cosner, C. 2005. A dynamic model for the ideal-free distribution as a partial differential equation. Theoretical Population Biology 67:101-108.
30. Denslow, J. S. 1980. Notes on the seedling ecology of a large-seeded species of Bombacaceae. Biotropica 12:220-222.
31. De Steven, D., and F. E. Putz. 1984. Impact of mammals on early recruitment of a tropical canopy tree, Dipteryx panamensis, in Panama. Oikos 43:207-216.
32. Dwyer, G., and W. F. Morris. 2006. Resource-dependent dispersal and the speed of biological invasions. American Naturalist 167:165-176.
33. Farnsworth, K. D., and A. R. A. Anderson. 2001. How simple grazing rules can lead to persistent boundaries in vegetation communities. Oikos 95:15-24.
34. Flaxman, S. M., and H. K. Reeve. 2006. Putting competition strategies into ideal free distribution models: habitat selection as a tug of war. Journal of Theoretical Biology 243:587-593.
35. Fleming, T. H., and E. R. Heithaus. 1981. Frugivorous bats, seed shadows, and the structure of tropical forests. Biotropica 13:45-53.
36. Forget, P. 1989. La régénération naturelle d'une espèce autochore de la Forêt Guyanaise: Eperua falcata Aublet (Caesalpiniaceae). Biotropica 21:115-125.
37. _. 1992. Regeneration ecology of Eperua grandiflora (Caesalpiniaceae), a large-seeded tree in French Guiana. Biotropica 24:146-156.
38. _. 1993. Post-dispersal predation and scatterhoarding of Dip teryx panamensis (Papilionaceae) seeds by rodents in Panama. Oecologia (Berlin) 94:225-261.
39. _. 1994. Recruitment pattern of Vouacapoua americana (Caesalpiniaceae), a rodent-dispersed tree species in French Guiana. Biotropica 26:408-419.
40. Forget, P., E. Munoz, and E. Giles Leigh Jr. 1994. Predation by rodents and bruchid beetles on seeds of Schelea palms on Barro Colorado Island, Panama. Biotropica 26:420-426.
41. Fragoso, J. M. V. 1997. Tapir-generated seed shadows: scale-dependent patchiness in the Amazon rain forest. Journal of Ecology 85:519-529.
42. Freckleton, R. P., and O. T. Lewis. 2006. Pathogens, density dependence and the coexistence of tropical trees. Proceedings of the Royal Society B: Biological Sciences 273:2909-2916.
43. Fretwell, S. D., and H. L. Lucas. 1969. On territorial behavior and other factors influencing habitat distribution in birds. I. Theoretical development. Acta Biotheoretica 19:16-36.
44. Gilbert, G. S., and D. De Steven. 1996. A canker disease of seedlings and saplings of Tetragastris panamensis (Burseraceae) caused by Botryosphaeria dothidea in a lowland tropical forest. Plant Disease 80:684-687.
45. Gilbert, G. S., K. E. Harms, D. N. Hamill, and S. P. Hubbell. 2001. Effects of seedling size, El Niño drought, seedling density, and distance to nearest conspecific adult on 6-year survival of Ocotea whitei seedlings in Panamá. Oecologia (Berlin) 127:509-516.
46. González-Martínez, S. C., J. Burczyk, R. Nathan, N. Nanos, L. Gil, and R. Alía. 2006. Effective gene dispersal and female reproductive success in Mediterranean maritime pine (Pinus pinaster Aiton). Molecular Ecology 15:4577-4588.
47. Goulson, D., S. A. Hawshon, and J. C. Stout. 1998. Foraging bumble bees avoid flowers already visited by conspecifics or by other bumble bee species. Animal Behaviour 55:199-206.
48. Grau, H. R. 2000. Regeneration patterns of Cedrela lilloi (Meliaceae) in northwestern Argentina subtropical montane forests. Journal of Tropical Ecology 16:227-242.
49. Gray, R. D., and M. Kennedy. 1994. Perceptual constraints on optimal foraging: a reason for departures from the ideal free distribution. Animal Behaviour 47:469-471.
50. Grünbaum, D. 1999. Advection-diffusion equations for generalized tactic searching behaviors. Journal of Mathematical Biology 38:169-194.
51. Grünbaum, D., and R. Veit. 2003. Black-browed albatrosses foraging on antarctic krill: density-dependence through local enhancement? Ecology 84:3265-3275.
52. Guittet, J., and J.-C. Laberche. 1974. L'implantation du pin sylvestre sur pelouse xérophile en forêt de Fontainebleu. II. Demographie des graines et des plantules au voisinage des vieux arbres. Acta Oecologica-Oecologia Plantarum 9:111-130.
53. Hakoyama, H. 2003. The ideal free distribution when the resource is variable. Behavioral Ecology 14:109-115.
54. Hammond, D. S., and V. K. Brown. 1998. Disturbance, phenology and life-history characteristics: factors influencing distance/density-dependent attack on tropical seeds and seedlings. Pages 51-78 in D. M. Newbery, H. H. T. Prins, and N. D. Brown, eds. Dynamics of tropical communities. Blackwell, Oxford.
55. Hancock, P. A., E. J. Milner-Gulland, and M. J. Keeling. 2006. Modelling the many-wrongs principle: the navigational advantages of aggregation in nomadic foragers. Journal of Theoretical Biology 240:302-310.
56. Harms, K. E., S. J. Wright, O. Calderón, A. Hernández, and E. Allen Herre. 2000. Pervasive density-dependent recruitment enhances seedling diversity in a tropical forest. Nature 404:493-495.
57. Hart, T. B. 1995. Seed, seedling and sub-canopy survival in monodominant and mixed forests of the Ituri Forest, Africa. Journal of Tropical Ecology 11:443-459.
58. Hassell, M. P., and R. M. May. 1974. Aggregation of predators and insect parasites and its effect on stability. Journal of Animal Ecology 43:567-594.
59. Hölldobler, B., and E. O. Wilson. 1990. The ants. Belknap, Cambridge, MA.
60. Holling, C. S. 1959. Some characteristics of simple types of predation and parasitism. Canadian Entomologist 91:385-398.
61. Holmes, E. E., M. A. Lewis, J. E. Banks, and R. R. Veit. 1994. Partial differential equations in ecology: spatial interactions and population dynamics. Ecology 75:17-29.
62. Holyoak, M., R. Casagrandi, R. Nathan, E. Revilla, and O. Spiegel. 2008. Trends and missing parts in the study of movement ecology. Proceedings of the National Academy of Sciences of the USA (forthcoming).
63. Howe, H. F. 1993. Aspects of variation in a Neotropical seed dispersal system. Vegetatio 107/108:149-162.
64. Howe, H. F., and R. B. Primack. 1975. Differential seed dispersal by birds of the tree Casearia nitida (Flacourtiaceae). Biotropica 7:278-283.
65. Howe, H. F., and J. Smallwood. 1982. Ecology of seed dispersal. Annual Review of Ecology and Systematics 13:201-228.
66. Howe, H. F., E. W. Schupp, and L. C. Westley. 1985. Early consequences of seed dispersal for a Neotropical tree (Virola surinamensis). Ecology 66:781-791.
67. Hubbell, S. P. 1979. Tree dispersion, abundance, and diversity in a tropical dry forest. Science 203:1299-1309.
68. _. 1980. Seed predation and the coexistence of tree species in tropical forests. Oikos 35:214-229.
69. Hubbell, S. P., R. Condit, R. B. Foster, P. J. Grubb, and C. D. Thomas. 1990. Presence and absence of density dependence in a Neotropical tree community. Philosophical Transactions of the Royal Society B: Biological Sciences 330:269-281.
70. Hugie, D. M., and T. C. Grand. 1998. Movement between patches, unequal competitors and the ideal free distribution. Evolutionary Ecology 12:1-19.
71. Hulme, P. E., and M. K. Hunt. 1999. Rodent post-dispersal seed predation in deciduous woodland: predator response to absolute and relative abundance of prey. Journal of Animal Ecology 68:417-428.
72. Hyatt, L. A., M. S. Rosenberg, T. G. Howard, G. Bole, W. Fang, J. Anastasia, K. Brown, et al. 2003. The distance dependence prediction of the Janzen-Connell hypothesis: a meta-analysis. Oikos 103:590-602.
73. Itoh, A., T. Yamakura, K. Ogino, H. Seng Lee, and P. S. Ashton. 1997. Spatial distribution patterns of two predominant emergent trees in a tropical rainforest in Sarawak, Malaysia. Plant Ecology 132:121-136.
74. Jackson, A. L., S. Humphries, and G. D. Ruxton. 2004. Resolving the departures of observed results from the ideal free distribution with simple random movements. Journal of Animal Ecology 73:612-622.
75. Janzen, D. H. 1970. Herbivores and the number of tree species in tropical forests. American Naturalist 104:501-528.
76. _. 1971a. Escape of juvenile Dioclea megacarpa (Leguminosae) vines from predators in a deciduous tropical forest. American Naturalist 105:97-112.
77. _. 1971b. Seed predation by animals. Annual Review of Ecology and Systematics 2:465-492.
78. _. 1972. Escape in space by Sterculia apetala seeds from the bug Dysdercus fasciatus in a Costa Rican deciduous forest. Ecology 53:350-361.
79. _. 1976. Why bamboos wait so long to flower. Annual Review of Ecology and Systematics 7:347-391.
80. Janzen, D. H., G. A. Miller, J. Hackforth-Jones, C. M. Pond, K. Hooper, and D. P. Janos. 1976. Two Costa Rican bat-generated seed shadows of Andira inermis (Leguminosae). Ecology 57:1068-1075.
81. Kacelnik, A., J. R. Krebs, and C. Bernstein. 1992. The ideal free distribution and predator-prey populations. Trends in Ecology & Evolution 7:50-55.
82. Kareiva, P., and G. Odell. 1987. Swarms of predators exhibit "preytaxis" if individual predators use area-restricted search. American Naturalist 130:233-270.
83. Katul, G. G., A. Porporato, R. Nathan, M. Siqueira, M. B. Soons, D. Poggi, H. S. Horn, and S. A. Levin. 2005. Mechanistic analytical models for long-distance seed dispersal by wind. American Naturalist 166:368-381.
84. Kitajima, K., and C. K. Augspurger. 1989. Seed and seedling ecology of a monocarpic tropical tree, Tachigalia versicolor. Ecology 70:1102-1114.
85. Koops, M. A., and M. V. Abrahams. 2003. Integrating the roles of information and competitive ability on the spatial distribution of social foragers. American Naturalist 161:586-600.
86. Levin, S. A., H. C. Muller-Landau, R. Nathan, and J. Chave. 2003. The ecology and evolution of seed dispersal: a theoretical perspective. Annual Review of Ecology, Evolution, and Systematics 34:575-604.
87. Mazzoleni, S., G. Bonanomi, F. Giannino, M. Rietkerk, S. C. Dekker, and F. Zucconi. 2007. Is plant biodiversity driven by decomposition processes? an emerging new theory on plant diversity. Community Ecology 8:103-109.
88. McCanny, S. J. 1985. Alternatives in parent-offspring relationships in plants. Oikos 45:148-149.
89. McCanny, S. J., and P. B. Cavers. 1987. The escape hypothesis: a test involving a temperate, annual grass. Oikos 49:67-76.
90. Meiners, S. J., and E. W. Stiles. 1997. Selective predation on the seeds of woody plants. Journal of the Torrey Botanical Society 124:67-70.
91. Moorcroft, P. R., S. W. Pacala, and M. A. Lewis. 2006. Potential role of natural enemies during tree range expansions following climate change. Journal of Theoretical Biology 241:601-616.
92. Muller-Landau, H. C., S. J. Wright, O. Calderón, S. P. Hubbell, and R. B. Foster. 2002. Assessing recruitment limitation: concepts, methods and case-studies from a tropical forest. Pages 35-53 in D. J. Levey, W. R. Silva, and M. Galetti, eds. Seed dispersal and frugivory: ecology, evolution and conservation. CABI, Wallingford, UK.
93. Muller-Landau, H. C., S. A. Levin, and J. E. Keymer. 2003. Theoretical perspectives on evolution of long-distance dispersal and the example of specialized pests. Ecology 84:1957-1967.
94. Murray, J. D. 2004. Mathematical biology II: spatial models and biomedical applications. Springer, New York.
95. Naef-Daenzer, B. 2000. Patch time allocation and patch sampling by foraging great and blue tits. Animal Behaviour 59:989-999.
96. Nathan, R., and R. Casagrandi. 2004. A simple mechanistic model of seed dispersal, predation and plant establishment: Janzen-Connell and beyond. Journal of Ecology 92:733-746.
97. _. 2005. A simple mechanistic model of seed dispersal, predation and plant establishment: Janzen-Connell and beyond (erratum). Journal of Ecology 93:852.
98. Nathan, R., and H. C. Muller-Landau. 2000. Spatial patterns of seed dispersal, their determinants and consequences for recruitment. Trends in Ecology & Evolution 15:278-285.
99. Nathan, R., U. N. Safriel, I. Noy-Meir, and G. Schiller. 2000. Spatiotemporal variation in seed dispersal and recruitment near and far from Pinus halepensis trees. Ecology 81:2156-2169.
100. Nathan, R., U. N. Safriel, and I. Noy-Meir. 2001. Field validation and sensitivity analysis of a mechanistic model for tree seed dispersal by wind. Ecology 82:374-388.
101. Nathan, R., W. M. Getz, E. Revilla, M. Holyoak, R. Kadmon, D. Saltz, and P. E. Smouse. 2008. A movement ecology paradigm for unifying organismal movement research. Proceedings of the National Academy of Sciences of the USA (forthcoming).
102. Nemeth, E., P. Bossew, and C. Plutzar. 2005. A distance-dependent estimation of foraging ranges of neighbouring bird colonies. Ecological Modelling 182:67-73.
103. Norghauer, J., J. R. Malcolm, B. L. Zimmerman, and J. M. Felfili. 2006. An experimental test of density- and distant-dependent recruitment of mahogany (Swietenia macrophylla) in southeastern Amazonia. Oecologia (Berlin) 148:437-446.
104. Notman, E., D. L. Gorchov, and F. Cornejo. 1996. Effect of distance, aggregation, and habitat on levels of seed predation for two mammal-dispersed Neotropical rain forest tree species. Oecologia (Berlin) 106:221-227.
105. Okubo, A. 1980. Diffusion and ecological problems: mathematical models. Springer, Berlin.
106. Okubo, A., and S. A. Levin. 2001. Diffusion and ecological problems. Springer, New York.
107. Okuda, T., N. Kachi, S. K. Yap, and N. Manokaran. 1997. Tree distribution pattern and fate of juveniles in a lowland tropical rain forest implications for regeneration and maintenance of species diversity. Plant Ecology 131:155-171.
108. Packer, A., and K. Clay. 2000. Soil pathogens and spatial patterns of seedling mortality in a temperate tree. Nature 404:278-281.
109. Patlak, C. S. 1953. Random walk with persistence and external bias. Bulletin of Mathematical Biophysics 15:311-338.
110. Pöysä, H. 1992. Group foraging in patchy environments: the importance of coarse-level local enhancement. Ornis Scandinavica 23:159-166.
111. Prince, P. J., and J. R. Dorman. 1981. High order embedded Runge-Kutta formulae. Journal of Computational and Applied Mathematics 7:67-75.
112. Ramirez, N., and M. K. Arroyo. 1987. Variación espacial y temporal en la depredación de semillas de Copaifera publiflora Benth. (Leguminosae: Caesalpinioideae) en Venezuela. Biotropica 19:32-39.
113. Ribbens, E., J. A. Silander Jr., and S. W. Pacala. 1994. Seedling recruitment in forests: calibrating models to predict patterns of tree seedling dispersion. Ecology 75:1794-1806.
114. Rosenberg, D. K., and K. S. McKelvey. 1999. Estimation of habitat selection for central place foraging animals. Journal of Wildlife Management 63:1028-1038.
115. Ruxton, G. D., and P. Rohani. 1999. Fitness-dependent dispersal in metapopulations and its consequences for persistence and synchrony. Journal of Animal Ecology 67:643-660.
116. Schupp, E. W. 1988. Factors affecting post-dispersal seed survival in a tropical forest. Oecologia (Berlin) 76:525-530.
117. Schupp, E. W., and M. Fuentes. 1995. Spatial patterns of seed dispersal and the unification of plant population ecology. Ecoscience 2:267-275.
118. Segel, L. A. 1977. A theoretical study of receptor mechanisms in bacterial chemotaxis. SIAM Journal of Applied Mathematics 32:653-665.
119. Serrano, J. M., J. A. Delgado, F. Lopez, F. J. Acosta, and S. G. Fungairino. 2001. Multiple infestation by seed predators: the effect of loculate fruits on intraspecific insect larval competition. Acta Oecologica- International Journal of Ecology 22:153-160.
120. Shochat, E., Z. Abramsky, B. Pinshow, and M. A. E. Whitehouse. 2002. Density-dependent habitat selection in migratory passerines during stopover: what causes the deviation from IFD? Evolutionary Ecology 16:469-488.
121. Skellam, J. G. 1951. Random dispersal in theoretical populations. Biometrika 38:196-218.
122. Slaa, E. J., J. Wassenberg, and J. C. Biesmeijer. 2003. The use of field-based social information in eusocial foragers: local enhancement among nestmates and heterospecifics in stingless bees. Ecological Entomology 28:369-379.
123. Sork, V. L. 1987. Effects of predation and light on seedling establishment in Gustavia superba. Ecology 68:1341-1350.
124. Stephens, D. W., and J. R. Krebs. 1986. Foraging theory. Princeton University Press, Princeton, NJ.
125. Sutherland, W. J. 1983. Aggregation and the ideal free distribution. Journal of Animal Ecology 52:821-828.
126. Sutherland, W. J., J. A. Gill, and K. Norris. 2002. Density-dependent dispersal in animals: concepts, evidence, mechanisms and consequences. Pages 134-151 in J. M. Bullock, R. E. Kenward, and R. S. Hails, eds. Dispersal ecology. Blackwell, Malden, MA.
127. Takeuchi, Y., and T. Nakashizuka. 2007. Effect of distance and density on seed/seedling fate of two dipterocarp species. Forest Ecology and Management 247:167-174.
128. Terborgh, J., and S. J. Wright. 1994. Effects of mammalian herbivores on plant recruitment in two Neotropical forests. Ecology 75:1829-1833.
129. Thompson, D. B., J. H. Brown, and W. D. Spencer. 1991. Indirect facilitation of granivorous birds by desert rodents: experimental evidence from foraging patterns. Ecology 72:852-863.
130. Traveset, A. 1990. Post-dispersal predation of Acacia farnesiana seeds by Stator vachelliae (Bruchidae) in Central America. Oecologia (Berlin) 84:506-512.
131. Turchin, P. 1998. Quantitative analysis of movement. Sinauer, Sunderland, MA.
132. Turchin, P., and P. Kareiva. 1989. Aggregation in Aphis varians: an effective strategy for reducing predation risk. Ecology 70:1008-1011.
133. Turner, E. R. A. 1964. Social feeding in birds. Behaviour 24:1-46.
134. Utne, A. C. W., D. L. Aksnes, and J. Giske. 1993. Food, predation risk and shelter: an experimental study on the distribution of adult two-spotted goby Gobiusculus flavescens (Fabricius). Journal of Experimental Marine Biology and Ecology 166:203-216.
135. van der Goes van Naters, W., and J. R. Carlson. 2006. Insects as chemosensors of humans and crops. Nature 444:302-307.
136. Vergassola, M., E. Villermaux, and B. I. Shraiman. 2007. Infotaxis as a strategy for searching without gradients. Nature 445:406-409.
137. Wenny, D. G. 2000. Seed dispersal, seed predation, and seedling recruitment of a Neotropical montane tree. Ecological Monographs 70:331-351.
138. Wilby, A., and M. Shachak. 2004. Shrubs, granivores and annual plant community stability in an arid ecosystem. Oikos 106:209-216.
139. Wills, C., R. Condit, R. B. Foster, and S. H. Hubbell. 1997. Strong density- and diversity-related effects help to maintain tree species diversity in a Neotropical forest. Proceedings of the National Academy of Sciences of the USA 94:1252-1257.
140. Wills, C., K. E. Harms, R. Condit, D. King, J. Thompson, F. He, H. C. Muller-Landau, et al. 2006. Nonrandom processes maintain diversity in tropical forests. Science 311:527-531.
141. Willson, M. F. 1993. Dispersal mode, seed shadows, and colonization patterns. Vegetatio 107/108:261-280.
142. Willson, M. F., and A. Traveset. 2000. The ecology of seed dispersal. Pages 85-110 in M. Fenner, ed. Seeds: the ecology of regeneration in plant communities. CAB International, Wallingford.
143. Wilson, D. E., and D. H. Janzen. 1972. Predation on Scheelea palm seeds by bruchid beetles: seed density and distance from the parent palm. Ecology 53:954-959.
144. Wright, S. J. 1983. The dispersion of eggs by a bruchid beetle among Scheelea palm seeds and the effect of distance to the parent palm. Ecology 64:1016-1021.
145. _. 2002. Plant diversity in tropical forests: a review of mechanisms of species coexistence. Oecologia (Berlin) 130:1-14.
146. Wyatt, J., and M. R. Silman. 2004. Distance-dependence in two Amazonian palms: effects of spatial and temporal variation in seed predator communities. Oecologia (Berlin) 140:26-35.