Article (Scientific journals)
Newt life after fish introduction: extirpation of paedomorphosis in a mountain fish lake and newt use of satellite pools
Denoël, Mathieu; Scime, Patrick; Zambelli, Nicola
2016In Current Zoology, 62 (1), p. 61-69
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Keywords :
Fish introduction; Introduced fish; Invasive species; Alien species; Conservation; mountain lake; alpine lake; pool; amphibian decline; alpine newt; Ichthyosaura alpestris alpestris; facultative paedomorphosis; metapopulation; spatial autocorrelation; ecological modelling; spatial GLMM; ecology; habitat; salmonids; Swiss; Alps; Val Maggia; Val Verzasca; Tessin; Ticino; mountain pool; occupancy; abundance
Abstract :
[en] Fish introduction is one of the main causes of amphibian decline worldwide. It affects particularly rare aquatic phenotypes such as paedomorphs, which retain gills during the adult stage. In this context, we determined whether small wetlands, such as pools surrounding fished and fishless lakes, could sustain paedomorphic and metamorphic newts. To this end, we surveyed lakes known historically to sustain Alpine newts (Ichthyosaura alpestris) as well as 35 nearby pools. On the basis of the published records, the only known population exhibiting paedomorphosis in the Swiss Alps was found to be extirpated by salmonid introductions. However, the metamorphs persisted in peripheral pools, paedomorphosis was discovered at a new locality, and overwintering larvae were still present in one of the lakes. These results show the importance of conserving varied aquatic habitats such as pools in mountainous environments where the main resources can become unsuitable for amphibians because of fish introductions. Pools may also function as reservoirs in maintaining newt populations until programs to remove fish from lakes can be carried out. It is not known if paedomorphs could reappear after fish removal. However, the combined resilience of amphibians after fish removal and the genetic basis for paedomorphosis highlighted in other taxa by previous studies suggest that there is the potential to maintain this intraspecific case of diversity even after its disappearance.
Research Center/Unit :
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Denoël, Mathieu  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale
Scime, Patrick
Zambelli, Nicola;  Museo Cantonale di Storia Naturale, Lugano, Switzerland
Language :
English
Title :
Newt life after fish introduction: extirpation of paedomorphosis in a mountain fish lake and newt use of satellite pools
Publication date :
2016
Journal title :
Current Zoology
ISSN :
1674-5507
eISSN :
2396-9814
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
62
Issue :
1
Pages :
61-69
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ULiège FSR - Université de Liège. Fonds spéciaux pour la recherche
F.R.S.-FNRS - Fonds de la Recherche Scientifique
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