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Understanding the Risk to Neotropical Migrant Bird Species of Multiple Human-Caused Stressors: Elucidating Processes Behind the Patterns. Ecology and Society
Hames, Ralph S.; Cornell Laboratory of Ornithology; rsh5@cornell.edu; Lowe, James D.; Cornell Laboratory of Ornithology; jdl6@cornell.edu; Swarthout, Sara Barker; Cornell Laboratory of Ornithology; sb65@cornell.edu; Rosenberg, Kenneth V.; Cornell Laboratory of Ornithology; kvr2@cornell.edu.
Ubiquitous human-caused changes to the environment act as multiple stressors for organisms in the wild, and the effects of these stressors may be synergistic, rather than merely additive, with unexpected results. However, understanding how focal organisms respond to these stressors is crucial for conservation planning for these species. We propose a paradigm that alternates extensive, broadscale data collection by volunteer collaborators to document patterns of response, with intensive fine-scale studies by professional researchers, to elucidate the processes underlying these patterns. We demonstrate this technique, building on our existing work linking patterns of population declines in the Wood Thrush (Hylocichla mustelina) to synergistic effects of acid...
Tipo: Peer-Reviewed Reports Palavras-chave: Multiple scales; Synergistic effects; Citizen science; Habitat fragmentation; Acid rain; Forests; Anthropogenic change; Soil; Calcium; Invertebrates.
Ano: 2006
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Fish habitat associations along a longitudinal gradient in a preserved coastal Atlantic stream, Brazil Rev. Bras. Zool.
Wolff,Luciano Lazzarini; Hahn,Norma Segatti.
ABSTRACT Habitat conditions at multiple scales are one of the major factors structuring ichthyofauna. Thus, we analyzed the fish habitat associations along the headwater-mouth gradient of a coastal Atlantic stream. We categorized the sampling sites into habitat units, so that in the middle reach these categories were statistically differentiated into riffles, runs and pools. Samplings were carried out quarterly from May 2009 to February 2010 using electrofishing. Principal component analysis (PCA) indicated an environmental gradient from higher water velocity and rocky bottom to deeper and sandy areas in the headwater-mouth direction. A total of 1,495 individuals belonging to 27 species were captured, being 13, 18 and 22 from headwater, middle and mouth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abiotic gradient; Diversity; Ichthyofauna; Mesohabitat; Multiple scales.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100335
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