RT Journal Article
SR Electronic
T1 Behavior influences range limits and patterns of coexistence across an elevational gradient in tropical bird diversity
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 528950
DO 10.1101/528950
A1 Benjamin G Freeman
A1 Joseph A Tobias
A1 Dolph Schluter
YR 2019
UL http://biorxiv.org/content/early/2019/01/23/528950.abstract
AB Does competition influence patterns of coexistence between closely related taxa? Here we address this basic question in ecology by analyzing patterns of range overlap between related bird species (“sister pairs”) distributed along a Neotropical elevational gradient. We explicitly contrast the behavioral dimension of interspecific competition (interference competition) with similarity in resource acquisition traits (exploitative competition). We find that behavioral interactions are generally important in setting elevational range limits and preventing coexistence of closely related species. Specifically, close relatives that defend year-round territories tend to live in non-overlapping elevational distributions, while close relatives that do not defend territories tend to broadly overlap in distribution. In contrast, neither similarity in beak morphology nor evolutionary relatedness was associated with patterns of range limitation. Our main result is that interference competition can be an important driver of species ranges at the scale of entire diverse assemblages. Consequently, we suggest that behavioral dimensions of the niche should be more broadly incorporated in macroecological studies.