Abiotic stress and biotic factors mediate range dynamics on opposing edges
نویسندگان
چکیده
Aim In the face of global change, understanding causes range limits are one most pressing needs in biogeography and ecology. A prevailing hypothesis is that abiotic stress forms cold (upper latitude/altitude) limits, whereas biotic interactions create warm (lower) limits. new framework – Interactive Range-Limit Theory (iRLT) asserts positive factors such as food availability can ameliorate along edges, have a effect mediate (e.g., competition) Location Northeastern United States Taxon Carnivora Methods We evaluated two hypotheses iRLT using occupancy structural equation modeling (SEM) frameworks based on data collected over 6-year period (2014–2019) six carnivore species across broad latitudinal (42.8–45.3°N) altitudinal (3–1451 m) gradient. Results found snow directly populations, but prey or habitat influence dynamics edges. For example, bobcats (Lynx rufus) coyotes (Canis latrans) were limited by deep long winters, had strong effect. Conversely, Canada lynx canadensis), countering negative competition with phylogenetically similar bobcat coyotes, highlighting how climate mediates between species. Main conclusions used an integrated dataset included competitors at same spatial temporal scale. As such, this design, causal (SEM), allowed us to evaluate community-wide macroecological scales identify coarse-scale drivers species' Our study supports underscores need consider direct indirect mechanisms for studying responses change.
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ژورنال
عنوان ژورنال: Journal of Biogeography
سال: 2021
ISSN: ['0305-0270', '1365-2699']
DOI: https://doi.org/10.1111/jbi.14112