Soil Calcium and Forest Birds: Indirect Links Between Nutrient Availability and Community Composition
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Calcium is an important nutrient that can be limiting in many forest ecosystems, where acid deposition and other natural and anthropogenic activities have resulted in significant soil calcium depletion. Calcium’s critical role in physiological and structural processes and its limited mobility and storage in many organisms, make it a potential driver of ecosystem structure and function, but little is known about how changes in soil calcium affect community composition, especially in terrestrial vertebrates. The aim of this study was to establish relationships between the abundances of forest songbird species and soil calcium and to elucidate linking mechanisms by establishing simultaneous relationships with trophic and habitat variables. We measured soil calcium and pH, calcium-rich invertebrate abundances, vegetation, and songbird abundances at 14 interior forest sites across central Pennsylvania representing a range of soil calcium levels. Bird community composition varied with soil calcium and pH, with 10 bird species having the highest abundances in forests with high calcium soils, and five species having the highest abundances with low calcium soils. Bird species associated with low-calcium soils were associated with high densities of mountain laurel (Kalmia latifolia), an acid-loving shrub, whereas bird species associated with high-calcium soils were associated with high densities of saplings and high basal area of acid-sensitive tree species. Homogenization of soil conditions through land-use patterns and soil calcium depletion pose the risk of reducing the beta diversity of bird species across forest areas because community composition varied with soil calcium.
Keywordscommunity birds forest calcium soils acidic deposition millipedes snails
The authors thank W. Tzilkowski and E. Smithwick for their advice, and D. Behrend, S. Chiavacci, C. Coverstone, D. Grear, J. Kauffman, T. Keller, P. Manning, L. Sisitki, G. Stokke, E. Stuber, T. Weidman, and T. Wertz for assistance in the field. Funding was provided by the Pennsylvania’s Wild Resource Conservation Program, and the Pennsylvania State University Agricultural Experiment Station. The use of field sites for this study was permitted by the PA Department of Conservation and Natural Resources and the PA Game Commission.
- Brooks M. 1940. The breeding warblers of the central Allegheny Mountain region. Wilson Bull 52:249–66.Google Scholar
- Eckert D, Thomas Sims J. 1995. Recommended soil pH and lime requirement tests. In: Thomas Sims J, Wolf A, Eds. recommended soil testing procedures for the Northeastern United States, Northeast Regional Bulletin #493. Newark, DE: Agricultural Experiment Station, University of Delaware. p 11–6.Google Scholar
- Ellison WG. 1992. Blue-gray Gnatcatcher (Polioptila caerulea). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/023. Ithaca (NY): Cornell Laboratory of Ornithology.
- Evans M, Gow E, Roth RR, Johnson MS, Underwood TJ. 2011. Wood Thrush (Hylocichla mustelina). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/246. Ithaca (NY): Cornell Laboratory of Ornithology.
- Graveland J, van Gijzen T. 1994. Arthropods and seeds are not sufficient as calcium sources for shell formation and skeletal growth in passerines. Ardea 82:299–314.Google Scholar
- Grubb Jr. TC, Pravasudov VV. 1994. Tufted titmouse (Baeolophus bicolor). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/086. Ithaca (NY): Cornell Laboratory of Ornithology.
- Hanners LA, Patton SR. 1998. Worm-eating Warbler (Helmitheros vermivorum). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/367. Ithaca (NY): Cornell Laboratory of Ornithology.
- Holmes RT, Rodenhouse NL, Sillett TS. 2005. Black-throated Blue Warbler (Setophaga caerulescens). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/087. Ithaca (NY): Cornell Laboratory of Ornithology.
- Lepš J, Šmilauer P, Eds. 2003. Multivariate analysis of ecological data using CANOCO. New York: Cambridge University Press.Google Scholar
- Mänd R, Tilgar V, Leivits A. 2000. Reproductive response of Great Tits, Parus major, in a naturally base poor forest habitat to calcium supplements. Can J Zool 75:509–17.Google Scholar
- Martin TE, Paine CR, Conway CJ, Hochochka WM, Allen P, Jenkins W. 1997. BBIRD field protocol. Montana: Montana Cooperative Wildlife Research Unit, University of Montana, Missoula.Google Scholar
- McCoy KD. 1999. Sampling terrestrial gastropod communities: using estimates of species richness and diversity to compare two methods. Malacologia 41:271–81.Google Scholar
- Nykvist N. 2002. How common are calcium-poor soils in the tropics? Ambio 31:445–7.Google Scholar
- Pabian SE, Rummel SM, Sharpe WE, Brittingham MC. 2012. Terrestrial liming as a restoration technique for acidified forest ecosystems. Int J For Res 2012:976809.Google Scholar
- Poole A, Ed. 2009. The birds of North America Online: http://bna.birds.cornell.edu/BNA/. Ithaca (NY): Cornell Laboratory of Ornithology.
- R development core team. 2009. R: a language and environment for statistical computing. Vienna: R Foundation for Statistical Computing. ISBN 3-900051-07-0. URL: http://www.R-project.org.
- Rummel SM. 2006. Short-term effects of forest liming on soil chemistry and terrestrial macroinvertebrates. MS Thesis. University Park (PA): The Pennsylvania State University.Google Scholar
- Sherry TW, Holmes RT. 1997. American Redstart (Setophaga ruticilla). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/277. Ithaca (NY): Cornell Laboratory of Ornithology.
- Simkiss K, Ed. 1967. Calcium in reproductive physiology. London and New York: Chapman and Hall.Google Scholar
- Stenger J. 1958. Food habits and available food of ovenbirds in relation to territory size. Auk 75:335–46.Google Scholar
- ter Braak CJF, Šmilauer P. 2002. CANOCO version 4.5 biometrics. Wageningen: Plant Research International.Google Scholar
- Wasson MF. 2002. Causes and consequences of calcium limitation in breeding passerine birds. PhD Dissertation. Ithaca (NY): Cornell University.Google Scholar
- Wherry ET. 1920. Observations on the soil acidity of Ericaceae and associated plants in the Middle Atlantic States. Proc Acad Natl Sci Phila 72:84–111.Google Scholar
- Whitehead DR, Taylor, T. 2002. Acadian Flycatcher (Empidonax virescens). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/614. Ithaca (NY): Cornell Laboratory of Ornithology.
- Winkler DW, Hallinger KK, Ardia DR, Robertson RJ, Stutchbury BJ, Cohen RR. 2011. Tree Swallow (Tachycineta bicolor). In: Poole A, Ed. The birds of North America Online: http://bna.birds.cornell.edu/bna/species/011. Ithaca (NY): Cornell Laboratory of Ornithology.
- Wolf AM, Beegle DB. 1995. Recommended soil tests for macronutrients: phosphorus, potassium, calcium, and magnesium. In: Thomas Sims J, Wolf A, Eds. Recommended soil testing procedures for the Northeastern United States. Northeast Regional Bulletin #493. Newark (DE): Agricultural Experiment Station, University of Delaware. p 25–34.Google Scholar
- Woods AJ, Omernik JM, Brown DD. 1999. Level III and IV ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia. Corvallis (OR): U.S. Environmental Protection Agency, National Health and Environmental Effects Research Laboratory.Google Scholar