Avian population and community processes in forest ecosystems: Long-term research in the Hubbard Brook Experimental Forest

Forest Ecology and Management

Volumn 262, Issue 1, 2011, Pages 20-32

  Holmes, Richard T ^a  

^a Dartmouth College ^*  (United States)

Author keywords

Bird fecundity; Drivers of bird population change; Environmental change; Hubbard Brook; Neotropical migrants; Population limitation

Indexed keywords

DRIVERS OF BIRD POPULATION CHANGE; ENVIRONMENTAL CHANGE; HUBBARD; NEOTROPICAL MIGRANTS; POPULATION LIMITATION;

BIRDS; ECOSYSTEMS; FORESTRY; POPULATION DYNAMICS; VEGETATION;

POPULATION STATISTICS;

BIRD; BREEDING POPULATION; DEMOGRAPHIC HISTORY; ENVIRONMENTAL CHANGE; FECUNDITY; FOOD AVAILABILITY; FOREST ECOSYSTEM; FOREST MANAGEMENT; HABITAT QUALITY; HABITAT STRUCTURE; NEOTROPIC ECOZONE; POPULATION DECLINE; POPULATION SIZE; RESEARCH WORK; TEMPERATE FOREST;

BIOLOGICAL POPULATIONS; BIRDS; ECOSYSTEMS; FOREST MANAGEMENT; FORESTRY; MIGRATION; PLANTS; SPECIES IDENTIFICATION; STATISTICS;

HUBBARD BROOK EXPERIMENTAL FOREST; NEW HAMPSHIRE; UNITED STATES;

AVES;

EID: 79957445212     PISSN: 03781127     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.foreco.2010.06.021     Document Type: Article

References (118)

1. Betts M.G., Hadley A.S., Rodenhouse N.L., Nocera J.J. Social information trumps vegetation structure in breeding site selection by a migrant songbird. Proc. R. Soc. Lond. B, Biol. Sci. 2008, 275:2257-2263.
2. Betts M.G., Rodenhouse N.L., Sillett T.S., Doran P.J., Holmes R.T. Dynamic occupancy models reveal within-breeding season movement up a habitat quality gradient by a migrant songbird. Ecography 2008, 31:592-600.
3. Bormann F.H., Likens G.L. Pattern and Process in a Forested Ecosystem 1979, Springer-Verlag, New York.
4. Blum J.D., Taliaferro E.H., Holmes R.T. Determining the sources of calcium for migratory songbirds using stable strontium isotopes. Oecologia 2001, 126:569-574.
5. Campbell J.L., Driscoll C.T., Eagar C., Likens G.E., Siccama T.G., Johnson C.E., Fahey T.G., Hamburg S.P., Holmes R.T., Bailey A.S., Buso D.C. Long-term Trends from Ecosystem Research in the Hubbard Brook Experimental Forest. Gen. Tech. Rep. NRS-17 2007, US Department of Agriculture, Forest Service, Northern Research Station, Newtown, PA.
6. Chamberlain C.P., Blum J.D., Holmes R.T., Feng X., Sherry T.W., Graves G.R. The use of isotope tracers for identifying populations of migratory birds. Oecologia 1997, 109:132-141.
7. Chuang-Dobbs H.C., Webster M.S., Holmes R.T. Paternity and parental care in the black-throated blue warbler (Dendroica caerulescens). Anim. Behav. 2001, 62:83-92.
8. Clotfelter E.D., Pedersen A.B., Cranford J.A., Ram N., Snajdr E.A., Nolan V., Ketterson E.D. Acorn mast drives long-term dynamics of rodent and songbird populations. Oecologia 2007, 154:493-503.
9. Cody M.L. Habitat Selection in Birds 1985, Academic Press, London.
10. Confer J.L., Holmes R.T. Neotropical migrants in undisturbed and human-altered forests in Jamaica. Wilson Bull. 1995, 107:577-589.
11. Doran, P.J., 2003. Intraspecific spatial variation in bird abundance: patterns and processes. Ph.D. Dissertation. Dartmouth College, Hanover, N.H.
12. Doran P.J., Holmes R.T. Habitat occupancy patterns of a forest dwelling songbird: causes and consequences. Can. J. Zool. 2005, 83:1297-1305.
13. Faaborg J., Holmes R.T., Anders A.D., Bildstein K.L., Dugger K.M., Gauthreaux S.A., Heglund P., Hobson K.A., Jahn A.E., Johnson D.H., Latta S.C., Levey D.J., Marra P.P., Merkord C.L., Nol E., Rothstein S.I., Sillett T.S., Sherry T.W., Thompson F.R., Warnock N. Recent advances in understanding migration systems of New World landbirds. Ecol. Monogr. 2010, 80:3-48.
14. Faaborg J., Holmes R.T., Anders A.D., Bildstein K.L., Dugger K.M., Gauthreaux S.A., Heglund P., Hobson K.A., Jahn A.E., Johnson D.H., Latta S.C., Levey D.J., Marra P.P., Merkord C.L., Nol E., Rothstein S.I., Sillett T.S., Sherry T.W., Thompson F.R., Warnock N. Conserving migratory landbirds in the NewWorld: Do we know enough?. Ecol. Applic. 2010, 20:398-418.
15. Goetz S.J., Steinberg D., Betts M.G., Holmes R.T., Doran P.J., Dubayah R., Hofton M. Lidar remote sensing variables predict habitat use by a breeding passerine bird. Ecology 2010, 91:1173-1181.
16. Goodbred C.O., Holmes R.T. Factors affecting food provisioning of nestling black-throated blue warblers. Wilson Bull. 1996, 108:467-479.
17. Gosz J.R., Holmes R.T., Likens G.E., Bormann F.H. The flow of energy through a forest ecosystem. Sci. Am. 1978, 238:92-102.
18. Graveland J., Drent R.H. Calcium availability limits breeding success of passerines on poor soils. J. Anim. Ecol. 1997, 66:279-288.
19. Groffman P.M., Driscoll C.T., Likens G.E., Fahey T.J., Holmes R.T., Eagar C., Aber J.D. Neither snow, nor rain, nor heat, nor gloom of night: a new conceptual model for the Hubbard Brook Ecosystem Study. BioScience 2004, 54:139-148.
20. Hames R.S., Rosenberg K.V., Lowe J.D., Barker S.E., Dohndt A.A. Adverse effects of acid rain on the distribution of the wood thrush Hylocichla mustelina in North America. Proc. Nat. Acad. Sci U.S.A. 2002, 99:11235-11240.
21. Hayhoe K., Wake C.P., Huntington T.G., Luo L., Schwartz M.D., Sheffield J., et al. Past and future changes in climate and hydrological indicators in the U.S. Northeast. Clim. Dyn. 2007, 28:381-407.
22. Holmes R.T. Foraging behavior of forest birds: male-female differences. Wilson Bull. 1986, 98:196-213.
23. Holmes R.T. Community structure, population fluctuations, and resource dynamics of birds in temperate deciduous forests. Proc. XIX Int. Ornithol. Congr. 1988, 1318-1327.
24. Holmes R.T. Ecological and evolutionary impact of bird predation on forest insects: an overview. Stud. Avian Biol. 1990, 13:6-13.
25. Holmes R.T. The structure of a temperate deciduous forest bird community: variability in time and space. Biogeography and Ecology of Forest Bird Communities 1990, 121-139. SPB Academic Publications, The Hague. A. Keast (Ed.).
26. Holmes R.T. Food resource availability and use in forest bird communities: a comparative view and critique. Biogeography and Ecology of Forest Bird Communities 1990, 387-394. SPB Academic Publications, The Hague. A. Keast (Ed.).
27. Holmes R.T. Understanding population change in migratory songbirds: long-term and experimental studies of Neotropical migrants in breeding and wintering areas. Ibis 2007, 149(Suppl. 2):2-13.
28. Holmes, R.T., Likens, G.E., 1999. Organisms of the Hubbard Brook Valley, New Hampshire, General Technical Report NE-257, USDA Forest Service, Northeastern Research Station, Radnor, PA.
29. Holmes R.T., Recher H.F. Determinants of guild structure in forest bird communities: an intercontinental comparison. Condor 1986, 88:427-439.
30. Holmes R.T., Robinson S.K. Tree species preferences by foraging insectivorous birds in a northern hardwoods forest. Oecologia 1981, 48:31-35.
31. Holmes R.T., Robinson S.K. Spatial patterns, foraging tactics, and diets of ground-foraging birds in a northern hardwoods forest. Wilson Bull. 1988, 100:377-394.
32. Holmes R.T., Schultz J.C. Food availability for forest birds: effects of prey distribution and abundance on bird foraging. Can. J. Zool. 1988, 66:720-728.
33. Holmes R.T., Sherry T.W. Assessing population trends of New Hampshire forest birds: local versus regional patterns. Auk 1988, 105:756-768.
34. Holmes R.T., Sherry T.W. Site fidelity of migratory warblers in temperate breeding and neotropical wintering areas: implications for population dynamics, habitat selection, and conservation. Ecology and Conservation of Neotropical Migrant Landbirds 1992, 563-575. Smithsonian Press, Washington DC. J.M. Hagan, D.W. Johnston (Eds.).
35. Holmes R.T., Sherry T.W. Thirty-year bird population trends in an unfragmented temperate deciduous forest: importance of habitat change. Auk 2001, 118:589-610.
36. Holmes R.T., Sturges F.W. Annual energy expenditure by the avifauna of a northern hardwoods forest. Oikos 1973, 24:23-38.
37. Holmes R.T., Sturges F.W. Avian community dynamics and energetics in a northern hardwood ecosystem. J. Anim. Ecol. 1975, 44:175-200.
38. Holmes R.T., Black C.P., Sherry T.W. Comparative population bioenergetics of three insectivorous passerines in a deciduous forest. Condor 1979, 81:9-20.
39. Holmes R.T., Bonney R.E., Pacala S.W. The guild structure of the Hubbard Brook bird community: a multivariate approach. Ecology 1979, 60:512-520.
40. Holmes R.T., Marra P.P., Sherry T.W. Habitat-specific demography of breeding black-throated blue warblers (Dendroica caerulescens): implications for population dynamics. J. Anim. Ecol. 1996, 65:183-195.
41. Holmes R.T., Rodenhouse N.L., Sillett T.S. Black-throated blue warbler (Dendroica caerulescens). The Birds of North America 2005, Cornell Laboratory of Ornithology, Ithaca, New York. A. Poole (Ed.).
42. Holmes R.T., Schultz J.C., Nothnagle P.J. Bird predation on forest insects: an exclosure experiment. Science 1979, 206:462-463.
43. Holmes R.T., Sherry T.W., Marra P.P., Petit K.E. Multiple-brooding and productivity of a neotropical migrant, the black-throated blue warbler (Dendroica caerulescens), in an unfragmented temperate forest. Auk 1992, 109:321-333.
44. Holmes R.T., Sherry T.W., Reitsma L.R. Population structure, territoriality, and overwinter survival of two migrant warbler species in Jamaica. Condor 1989, 91:545-561.
45. Holmes R.T., Sherry T.W., Sturges F.W. Bird community dynamics in a temperate deciduous forest: long-term trends at Hubbard Brook. Ecol. Monogr. 1986, 56:201-220.
46. Holmes R.T., Sherry T.W., Sturges F.W. Numerical and demographic responses of temperate forest birds to annual fluctuations in their food resources. Proc. XXth Int. Ornithol. Congr. (Christchurch) 1991, 1559-1567.
47. Hunt P.D. Habitat selection by American redstarts along a successional gradient in northern hardwoods forest: evaluation of habitat quality. Auk 1996, 113:875-888.
48. Hunt P.D. Evidence from a landscape population model of the importance of early successional habitat to the American redstart. Conserv. Biol. 1998, 12:1377-1389.
49. Johnson M.D., Geupel G.R. The importance of productivity to the dynamics of a Swainson's thrush population. Condor 1996, 98:133-141.
50. Johnson M.D., Sherry T.W. Effects of food availability on distribution of migratory warblers among habitats in Jamaica. J. Anim. Ecol. 2001, 70:546-560.
51. Johnson M.D., Sherry T.W., Holmes R.T., Marra P.P. Assessing habitat quality for a migratory songbird wintering in natural and agricultural habitats. Conserv. Biol. 2006, 20:1433-1444.
52. Jones J., Doran P.J., Holmes R.T. Climate and food synchronize regional forest bird abundances. Ecology 2003, 84:3024-3032.
53. Jones J., Doran P.J., Holmes R.T. Spatial scaling of avian population dynamics: population abundance, growth rate, and variability. Ecology 2007, 88:2505-2515.
54. Kornan M., Holmes R.T. Konvergencia štruktúry potravných gíld ornitocenóz medzi lesmi dvoch zoogeografi{ligature}ckýchoblastí [Convergence in foraging guild structure of bird assemblages between forests in two zoogeographic regions]. Tichodrama 2009, 21:15-32.
55. Lee P.-Y., Rotenberry J.T. Relationships between bird species and tree species assemblages in forested habitats of eastern North America. J. Biogeogr. 2005, 32:1139-1150.
56. Likens G.E., Driscoll C.T., Buso D.C. Long-term effects of acid rain: response and recovery of a forest ecosystem. Science 1996, 272:244-246.
57. Marra P.P. The role of behavioral dominance in structuring habitat occupancy of a migrant bird during the non-breeding season. Behav. Ecol. 2000, 11:299-308.
58. Marra P.P., Holberton R.L. Corticosterone levels as indictors of habitat quality: Effects of habitat segregation in a migratory bird during the non-breeding period. Oecologia 1998, 116:284-292.
59. Marra P.P., Holmes R.T. Avian removal experiments: do they test for habitat saturation or female availability?. Ecology 1997, 78:947-952.
60. Marra P.P., Holmes R.T. Consequences of dominance-mediated habitat segregation in a migrant passerine bird during the non-breeding season. Auk 2001, 118:94-106.
61. Marra P.P., Hobson K.A., Holmes R.T. Linking winter and summer events in a migratory bird by using stable-carbon isotopes. Science 1998, 282:1884-1886.
62. Marra P.P., Norris D.R., Haig S.M., Webster M., Royle J.A. Migratory connectivity. Connectivity Conservation 2006, 157-183. Cambridge University Press, Cambridge. K.R. Crooks, M. Sanjayan (Eds.).
63. Marra P.P., Sherry T.W., Holmes R.T. Territorial exclusion by a long-distance migrant warbler in Jamaica: a removal experiment with American redstarts (Setophaga ruticilla). Auk 1993, 110:565-572.
64. McPeek M.A., Rodenhouse N.L., Sherry T.W., Holmes R.T. Site dependent population regulation: population-level regulation without individual-level interactions. Oikos 2001, 94:417-424.
65. Nagy L.R., Holmes R.T. Food limits annual fecundity of a migratory songbird: an experimental study. Ecology 2005, 86:675-681.
66. Nagy L.R., Holmes R.T. To double brood or not: individual variation in reproductive effort in black-throated blue warblers (Dendroica caerulescens). Auk 2005, 122:902-914.
67. Newton I. Population limitation in migrants. Ibis 2004, 146:197-226.
68. Nolan V. The ecology and behavior of the prairie warbler Dendroica discolor. Ornith. Monogr. 1978, 26:1-595.
69. Norris D.R., Marra P.P., Kyser T.K., Sherry T.W., Ratcliffe L.M. Tropical winter habitat limits reproductive success on the temperate breeding grounds in a migratory bird. Proc. R. Soc. Lond. B 2004, 271:59-64.
70. Pabian S.E., Brittingham M.C. Terrestrial liming benefits birds in an acidified forest in the Northeast. Ecol. Appl. 2007, 17:2184-2194.
71. Perreault S., Lemon R.E., Kuhnlein U. Patterns and correlates of extra-pair paternity in American redstarts. Setophaga ruticilla. Behav. Ecol. 1997, 8:612-621.
72. Reitsma L.R. Is nest predation density dependent? a test using artificial nests. Can. J. Zool. 1992, 70:2498-2500.
73. Reudink M.W., Marra P.P., Kyser T.K., Boag P.T., Langin K.M., Ratcliffe L.M. Non-breeding season events influence sexual selection in a long-distance migratory bird. Proc. R. Soc. B., Biol. Sci. 2009, 276:1619-1626.
74. Reynolds L.V., Ayres M.P., Siccama T.G., Holmes R.T. Climatic effects on caterpillar fluctuations in northern hardwood forests. Can. J. For. Res. 2007, 37:481-491.
75. Ricklefs R.E. An analysis of nestling mortality in birds. Smithson. Contrib. Zool. 1969, 9:1-48.
76. Robinson S.K. Ecological relations and social interactions of Philadelphia and red-eyed vireos. Condor 1981, 83:16-26.
77. Robinson S.K., Holmes R.T. Foraging behavior of forest birds: the relationships among search tactics, diet, and habitat structure. Ecology 1982, 63:1918-1931.
78. Robinson S.K., Holmes R.T. Effects of plant species and foliage structure on the foraging behavior of forest birds. Auk 1984, 101:672-684.
79. Rodenhouse N.L. Potential effects of climatic change on migrant land birds: a simulation model. Conserv. Biol. 1992, 6:263-272.
80. Rodenhouse N.L., Holmes R.T. Effects of experimental and natural food reductions for breeding black-throated blue warblers. Ecology 1992, 73:357-372.
81. Rodenhouse N.L., Matthews S.N., McFarland K.P., Lambert J.D., Iverson L.R., Prasad A., Sillett T.S., Holmes R.T. Potential effects of climate change on birds of the Northeast. Mitig. Adapt. Strat. Glob. Change 2008, 13:517-540.
82. Rodenhouse N.L., Sherry T.W., Holmes R.T. Site-dependent regulation of population size: a new synthesis. Ecology 1997, 78:2025-2042.
83. Rodenhouse N.L., Sillett T.S., Doran P.J., Holmes R.T. Multiple density-dependent mechanisms regulate a migratory bird population during the breeding season. Proc. R. Soc. Lond. B, Biol. Sci. 2003, 270:2105-2110.
84. Rubenstein D.R., Chamberlain C.P., Holmes R.T., Ayres M.P., Waldbauer J.R., Graves G.R., Tuross N.C. Linking breeding and wintering ranges of a Neotropical migrant songbird using stable isotopes. Science 2002, 295:591-593.
85. Sabo S.R., Holmes R.T. Foraging niches and community structure of forest birds in contrasting habitats in the White Mountains. New Hampshire. Condor 1983, 85:121-138.
86. Schmidt K.A., Rush S.A., Ostfeld R.S. Wood Thrush nest success and post fledging survival across a pulse of small mammal abundance in an oak forest. J. Anim. Ecol. 2008, 77:830-837.
87. Schwenk, W.S., 2008. Interactions among birds, insects, trees, and the environment in a northern forest ecosystem. Ph.D. dissertation, University of Vermont, Burlington VT USA.
88. Sherry T.W. Competitive interactions and adaptive strategies of American redstarts and least flycatchers in a northern hardwoods forest. Auk 1979, 96:265-283.
89. Sherry T.W., Holmes R.T. Dispersion and habitat responses of birds in northern hardwoods forest. Habitat Selection in Birds 1985, 283-309. Academic Press, New York. M. Cody (Ed.).
90. Sherry T.W., Holmes R.T. Habitat selection by breeding American redstarts in response to a dominant competitor, the least flycatcher. Auk 1988, 105:350-364.
91. Sherry T.W., Holmes R.T. Age-specific social dominance affects habitat use by breeding American redstarts (Setophaga ruticilla): a removal experiment. Behav Ecol. Sociobiol. 1989, 25:327-333.
92. Sherry T.W., Holmes R.T. Population fluctuations in a long-distance Neotropical migrant: demographic evidence for the importance of breeding season events in the American redstart. Ecology and Conservation of Neotropical Migrant Landbirds 1992, 431-442. Smithsonian Press, Washington D.C. J.M. Hagan, D.W. Johnston (Eds.).
93. Sherry T.W., Holmes R.T. Are populations of Neotropical migrant birds limited in summer or winter? implications for management. Status and Management of Neotropical Migratory Birds. Gen. Tech. Rep. RM-229 1993, 47-57. US Department of Agriculture, Forest Service, Fort Collins, CO. D.M. Finch, P.W. Stangel (Eds.).
94. Sherry T.W., Holmes R.T. Summer versus winter limitation of populations: conceptual issues and evidence. Ecology and Management of Neotropical Migratory Birds: a Synthesis and Review of Critical Issues. 1995, 85-120. Oxford University Press, New York. T. Martin, D. Finch (Eds.).
95. Sherry T.W., Holmes R.T. Winter habitat quality, population limitation, and conservation of Neotropical-Nearctic migrant birds. Ecology 1996, 77:36-48.
96. Sherry T.W., Holmes R.T. American Redstart (Setophaga ruticilla). The Birds of North America 1997, The Academy of Natural Sciences, Philadelphia and The American Ornithologists' Union, Washington D.C. A. Poole, F. Gill (Eds.).
97. Sherry T.W., Johnson M.D., Strong A.M. Does winter food limit populations of migratory birds?. Birds of Two Worlds, The Ecology and Evolution of Migration 2005, 414-425. Johns Hopkins Press, Baltimore. R. Greenberg, P.P. Marra (Eds.).
98. Sillett T.S., Holmes R.T. Variation in survivorship of a migratory songbird throughout its annual cycle. J. Anim. Ecol. 2002, 71:296-308.
99. Sillett T.S., Holmes R.T. Long-term demographic trends, limiting factors, and the strength of density dependence in a breeding population of a migratory songbird. Birds of Two Worlds, The Ecology and Evolution of Migration 2005, 426-436. Johns Hopkins Press, Baltimore. R. Greenberg, P.P. Marra (Eds.).
100. Sillett T.S., Holmes R.T., Sherry T.W. Impacts of a global climate cycle on the population dynamics of a migratory songbird. Science 2000, 288:2040-2042.
101. Sillett T.S., Rodenhouse N.L., Holmes R.T. Experimentally reducing neighbor density affects reproduction and behavior of a migratory songbird. Ecology 2004, 85:2467-2477.
102. Sloan S.S., Holmes R.T., Sherry T.W. Depredation rates and predators at artificial bird nests in an unfragmented northern hardwood forest. J. Wildl. Manage. 1998, 62:529-539.
103. Stamps J.A. Conspecific attraction and aggregation in territorial species. Am. Nat. 1988, 131:329-347.
104. Steele B.B. Habitat selection by breeding black-throated blue warblers (Dendroica caerulescens) at two spatial scales. Ornis Scand. 1992, 23:33-42.
105. Steele B.B. Selection of foraging and nesting sites by black-throated blue warblers: their relative influence on habitat choice. Condor 1993, 95:568-579.
106. Stenning M.J., Harvey P.H., Campbell B. Searching for density-dependent regulation in a population of pied flycatchers Ficedula hypoleuca Pallas. J. Anim. Ecol. 1988, 57:307-317.
107. Strong A.M., Sherry T.W. Habitat-specific effects of food abundance on the condition of ovenbirds wintering in Jamaica. J. Anim. Ecol. 2000, 69:883-895.
108. Strong A.M., Sherry T.W., Holmes R.T. Bird predation on herbivorous insects: indirect effects on sugar maple saplings. Oecologia 2000, 125:370-379.
109. Studds C.E., Kyser T.K., Marra P.P. Natal dispersal driven by environmental conditions interacting across the annual cycle of a migratory bird. Proc. Nat. Acad. Sci. U.S.A. 2008, 105:2929-2933.
110. Sturges F.W., Holmes R.T., Likens G.E. The role of birds in nutrient cycling in a northern hardwoods ecosystem. Ecology 1974, 55:129-155.
111. Stutchbury B.J.M., Tarof S.A., Done T., Gow E., Kramer P.M., Tautin J., Fox J.W., Afansyev V. Tracking long-distance songbird migration by using geolocators. Science 2009, 323:896.
112. Taliaferro E.H., Holmes R.T., Blum J.D. Eggshell characteristics and calcium demands of a migratory bird breeding in two New England forests. Wilson Bull. 2001, 113:94-100.
113. Virolainen M. Breeding biology of the pied flycatcher Ficedula hypoleuca in relation to population density. Ann. Zool. Fenn. 1984, 21:187-197.
114. Webster M.S., Marra P.P. The importance of understanding migratory connectivity and seasonal interactions. Birds of Two Worlds, The Ecology and Evolution of Migration 2005, 199-209. Johns Hopkins Press, Baltimore. R. Greenberg, P.P. Marra (Eds.).
115. Webster M.S., Chuang-Dobbs H.C., Holmes R.T. Microsatellite identification of extra-pair sires in a socially monogamous warbler. Behav. Ecol. 2001, 12:439-446.
116. Webster M.S., Marra P.P., Haig S.M., Bensch S., Holmes R.T. Links between worlds: unraveling migratory connectivity. Trends Ecol. Evol. 2002, 17:76-83.
117. Whelan C.J. Foliage structure influences foraging of insectivorous forest birds: an experimental study. Ecology 2001, 82:219-231.
118. Wiens J.A. The Ecology of Bird Communities 1989, Cambridge University Press, Cambridge.