NDLI: Interspecific dominance and asymmetric competition with respect to nesting habitats between two snowfinch species in a high-altitude extreme environment

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Interspecific dominance and asymmetric competition with respect to nesting habitats between two snowfinch species in a high-altitude extreme environment

Content Provider	Springer Nature Link
Author	Zeng, Xianhai Lu, Xin
Copyright Year	2008
Abstract	Interference competition over shared resources is expected to be intensive in harsh environments between phylogenetically and morphologically similar species. We document interspecific dominance and nest habitat selection by two pika-burrow nesting Montifringilla species, white-rumped snowfinches M. taczanowskii (WRS), and rufous-necked snowfinches M. ruficollis (RNS), which commonly inhabit alpine meadows in the northeastern Tibetan plateau. Relative to the critical point (<0.60) for coexistence, high overlaps (0.68–0.86) between the two species in egg-laying date, nest site distribution and nesting burrow attributes suggested strong interspecific competition over these niches. This is also predicted by the ratios of inter-species body mass (1.4) and linear dimensions (1.1–1.2) below the minimum value (2.0 and 1.3) for stable coexistence of closely related species. Larger-sized WRS was behaviorally dominant over pikas and over small-sized RNS. Being dominant, WRS established nesting territories in areas with moderately steep slopes from which they required most of the food resources during the breeding season; in contrast, RNS exhibited no territoriality and had to nest at margins between WRS’s territories and fed at dispersed sites. For the same reason, WRS mainly used active, and RNS used inactive, pika burrows. The asymmetric competition over nesting habitats could contribute to the relatively high nesting success and breeding density of the superior species. We argue that there is a spectrum in interspecific competition strength, from stable coexistence to complete exclusion along a gradient of increased environmental harshness, and the guild of the two snowfinch species is at a mediate position of the spectrum.
Starting Page	607
Ending Page	616
Page Count	10
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	24
Issue Number	3
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2008-07-16
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alpine meadow Asymmetric competition Body size Interspecific dominance Nest site selection Snowfinch Tibetan plateau Forestry Behavioural Sciences Evolutionary Biology Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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