Trophic specialisations in alternative heterochronic morphs

被引:34
作者
Denoël, M
Schabetsberger, R
Joly, P
机构
[1] Univ Liege, Dept Life Sci, Behav Biol Unit, Lab Fish & Amphibian Ethol, B-4020 Liege, Belgium
[2] Salzburg Univ, Inst Zool, A-5020 Salzburg, Austria
[3] Univ Lyon 1, Lab Ecol Fluvial Hydrosyst, F-69622 Villeurbanne, France
关键词
D O I
10.1007/s00114-003-0492-6
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Polymorphisms are suspected of reducing competition among conspecifics in heterogeneous environments by allowing differential resource use. However the adaptive significance of alternative morphs has been poorly documented. The aim of this study is to determine food partitioning of two heterochronic morphs of the Alpine newt, Triturus alpestris, in mountain lakes. The morphs differ in the functional morphology of their feeding apparatus. Only paedomorphs are able to expel water during prey suction behind the mouth through gill slits. We observed a substantial trophic differentiation between morphs in all lakes. Paedomorphs preyed mainly on plankton, whereas metamorphs foraged on terrestrial invertebrates that fell upon the water surface. This resource partitioning may facilitate the coexistence of the alternative morphs in lakes devoid of vertebrate competitors. Food diversity may thus favour the evolutionary maintenance of facultative polymorphism in natural populations.
引用
收藏
页码:81 / 84
页数:4
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