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Isocline analysis of competition predicts stable coexistence of two amphibians


Gazzola, Andrea; Van Buskirk, Josh (2015). Isocline analysis of competition predicts stable coexistence of two amphibians. Oecologia, 178(1):153-159.

Abstract

We investigated the interaction between larvae of two anuran amphibian species (Rana temporariaand Bufo bufo) to test models of two-species competition. The study had a response surface experimental design with four replicates, each consisting of 24 density combinations. Larval performance—and, by assumption, change in population size—was defined by a linear combination of survival, growth, and development. We fit six competition models from the literature and discovered that density dependence was strongly non-linear, with the highest support for the Hassel–Comins model. Rana temporariawas competitively superior to B. bufo; the impacts of both species on growth and development were about five- to tenfold greater than those on survival. Isocline analysis predicted a stable configuration, which agrees with the observation that these two species are syntopic in nature. The results of this study confirm competition theory by identifying a model structure that agrees with data and making predictions that are broadly supportive of the observations.

We investigated the interaction between larvae of two anuran amphibian species (Rana temporariaand Bufo bufo) to test models of two-species competition. The study had a response surface experimental design with four replicates, each consisting of 24 density combinations. Larval performance—and, by assumption, change in population size—was defined by a linear combination of survival, growth, and development. We fit six competition models from the literature and discovered that density dependence was strongly non-linear, with the highest support for the Hassel–Comins model. Rana temporariawas competitively superior to B. bufo; the impacts of both species on growth and development were about five- to tenfold greater than those on survival. Isocline analysis predicted a stable configuration, which agrees with the observation that these two species are syntopic in nature. The results of this study confirm competition theory by identifying a model structure that agrees with data and making predictions that are broadly supportive of the observations.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2015
Deposited On:16 Jul 2015 08:50
Last Modified:05 Apr 2016 19:18
Publisher:Springer
ISSN:0029-8549
Publisher DOI:https://doi.org/10.1007/s00442-015-3273-y
PubMed ID:25722192
Permanent URL: https://doi.org/10.5167/uzh-111423

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