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Intraguild Predation on Congeners Affects Size, Aggression, and Survival among Ambystoma Salamander Larvae
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Intraguild Predation on Congeners Affects Size, Aggression, and Survival among Ambystoma Salamander Larvae

著者： Robert Brodman
版本/格式： 文章 文章 : 英语
刊登在：Journal of Herpetology, Mar., 2004, vol. 38, no. 1, p. 21-26
数据库：JSTOR
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文件类型： 文章
所有的著者/提供者： Robert Brodman
ISSN:0022-1511
OCLC号码： 480381748
语言注释： English
注意： Fig. 1. Mean SVL ± SE (mm) of Ambystoma opacum, Ambystoma jeffersonianum, and Ambystoma tiginum larvae after seven days in the food supplement experiment. The F- and P-values from separate one-way ANOVA tests of control versus treatment (α = 0.0167 after Bonferroni adjustment) are F<sub>1,79</sub> = 291.2, P = 0.0001 (A. opacum); F<sub>1,79</sub> = 43.9, P = 0.0001 (A. jeffersonianum); and F<sub>1,79</sub> = 110.8, P = 0.0001 (A. tigrinum).
Fig. 2. Mean SVL growth ± SE (mm) of treatment Ambystoma opacum, Ambystoma jeffersonianum, and Ambystoma tiginum larvae after seven days in the food supplement experiment. The F- and P-values from separate one-way ANOVA tests of treatment larvae that ate a congener versus treatment larvae that did not eat a congener (α = 0.0167 after Bonferroni adjustment) are F<sub>1,79</sub> = 21.8, P = 0.0003 (A. opacum); F<sub>1,79</sub> = 41.3, P = 0.0001 (A. jeffersonianum); and F<sub>1,79</sub> = 24.0, P = 0.0001 (A. tigrinum).
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摘要：

I designed laboratory and mesocosm experiments to test the hypotheses that consumption of a congener as supplemental food can increase the size variance, size, aggression rates, and mortality of intraguild predator populations. Experimental populations of Marbled Salamander (Ambystoma opacum), Jefferson Salamander (Ambystoma jeffersonianum) and Tiger Salamander (Ambystoma tigrinum) larvae that were initially fed a smaller congener Spotted Salamander (Ambystoma maculatum) as a food supplement developed larger SVL and size variation after seven days than control larvae that were not fed a congener. Experimental treatment populations had greater initial size variation because some larvae ate a congener and others did not. Treatment larvae had increased SVL, aggression rates and mortality after 60 days compared to control populations. These results suggest that intraguild predation on a congener can affect fitness and population dynamics of predator populations. I hypothesize that intraguild predation on congeners results in size variation and then increased aggression and mortality caused by cannibalism.

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