Food resources vary in terms of digestibility and constraints in food processing are an essential factor driving the evolution of adaptations to cope with them,for example,a complex morphology of gastric tract,symbios...Food resources vary in terms of digestibility and constraints in food processing are an essential factor driving the evolution of adaptations to cope with them,for example,a complex morphology of gastric tract,symbiosis with microorganisms,enzymatic specialization(McNab 2002).Pellet egestion is an other important adaptation that enables to remove indigestible food particles and is observed in several vertebrate taxa.展开更多
Amphibians produce defensive chemicals which provide protection against both predators and infections.Within species,populations can differ considerably in the composition and amount of these chemical defenses.Studyin...Amphibians produce defensive chemicals which provide protection against both predators and infections.Within species,populations can differ considerably in the composition and amount of these chemical defenses.Studying intraspecific variation in toxins and linking it to environmental variables may help us to identify the selective drivers of toxin evolution,such as predation pressure and infection risk.Recently,there has been a renewed interest in the unique toxins produced by salamanders from the genus Salamandra:the samandarines.Despite this attention,intraspecific variation has largely been ignored within Salamandra-species.The aim of this study was to investigate whether geographic variation in profiles of samandarines exists,by sampling 4 populations of Salamandra atra over its range in the Dinaric Alps.In addition,we preliminary explored whether potential variation could be explained by predation(counting the number of snake species)and infection risk(cultivation and genomic analyses of collected soil samples).Salamanders from the 4 populations differed in toxin composition and in the size of their poison glands,although not in overall toxin quantity.Nor predation nor infection risk could explain this variation,as populations barely differed in these variables.Sampling over a much broader geographic range,using better estimators for predation and infection risk,will contribute to an improved understanding of how environment may shape variation in chemical defenses.Nevertheless,as the 4 populations of S.atra did differ in their toxin profiles,we propose that this species provides an interesting opportunity for further ecological and evolutionary studies on amphibian toxins.展开更多
基金We thank Marcus Clauss and 2 anonymous reviewers for their valuable comments on earlier version of the manuscript.The study was supported by the grant from National Science Centre in Poland(grant no.UMO-2016/21/N/NZ8/00959).
文摘Food resources vary in terms of digestibility and constraints in food processing are an essential factor driving the evolution of adaptations to cope with them,for example,a complex morphology of gastric tract,symbiosis with microorganisms,enzymatic specialization(McNab 2002).Pellet egestion is an other important adaptation that enables to remove indigestible food particles and is observed in several vertebrate taxa.
基金This research was funded by the Federal Ministry of Environmental Protection and Tourism in Sarajevo(grant to ES,grant ID:04-23-1105-IV/16-65-1)by the Fonds Wetenschappelijk Onderzoek Flandres through a Ph.D.fellowship(to GDM,grant ID:1144118N).
文摘Amphibians produce defensive chemicals which provide protection against both predators and infections.Within species,populations can differ considerably in the composition and amount of these chemical defenses.Studying intraspecific variation in toxins and linking it to environmental variables may help us to identify the selective drivers of toxin evolution,such as predation pressure and infection risk.Recently,there has been a renewed interest in the unique toxins produced by salamanders from the genus Salamandra:the samandarines.Despite this attention,intraspecific variation has largely been ignored within Salamandra-species.The aim of this study was to investigate whether geographic variation in profiles of samandarines exists,by sampling 4 populations of Salamandra atra over its range in the Dinaric Alps.In addition,we preliminary explored whether potential variation could be explained by predation(counting the number of snake species)and infection risk(cultivation and genomic analyses of collected soil samples).Salamanders from the 4 populations differed in toxin composition and in the size of their poison glands,although not in overall toxin quantity.Nor predation nor infection risk could explain this variation,as populations barely differed in these variables.Sampling over a much broader geographic range,using better estimators for predation and infection risk,will contribute to an improved understanding of how environment may shape variation in chemical defenses.Nevertheless,as the 4 populations of S.atra did differ in their toxin profiles,we propose that this species provides an interesting opportunity for further ecological and evolutionary studies on amphibian toxins.
