Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper)
The Pyrenean brook newt (Calotriton asper) is a salamandrid that mostly lives in fast running and cold mountainstreams, although some populations are also found in lakes. In the present work, we report in detail on the occurrence of facultative paedomorphosis traits in a population from a Pyrenean high altitude lake.We compare its morphology, life history traits and mitochondrial DNA variation with a nearby lotic metamorphic population. Our results indicate that the lacustrine newts are smaller and present a less developed sexual dimorphism, smooth skin, and that 53% of the adults retain gills at different degrees of development, but not gill slits. Although both populations and sexes have the same age at sexual maturity (four years), the lacustrine population presents higher longevity (12 and 9 years for males and females, respectively) than the one living in the stream (8 and 9 years). The variation on the climatic conditions at altitudinal scale is probably the main cause of the differences in life history traits found between the two populations. The food availability, which could to be limiting in the lacustrine population, is another factor that can potentially affect body size. These results are congruent with the significant mitochondrial DNA genetic isolation between populations, probably a consequence of the lack of juvenile dispersal.We found low cytochrome b variability and significant genetic structuring in the lake population that is very remarkably considering the short distance to the nearby stream population and the whole species' pattern. We suggest that a bottleneck effect and/or phenotypic plasticity may have resulted in the appearance of a paedomorphic morph in the lake. © 2014 Koninklijke Brill NV, Leiden.
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Brill Academic Publishers
2014
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Subjects: | Calotriton asper, Skeletochronology, Paedomorphosis, Age structure, |
Online Access: | http://hdl.handle.net/10261/113650 http://dx.doi.org/10.13039/501100010067 |
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dig-ibe-es-10261-1136502018-09-27T07:29:46Z Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) Oromi, Neus Amat, Fèlix Sanuy, Delfi Carranza, Salvador Gobierno de Aragón Calotriton asper Skeletochronology Paedomorphosis Age structure The Pyrenean brook newt (Calotriton asper) is a salamandrid that mostly lives in fast running and cold mountainstreams, although some populations are also found in lakes. In the present work, we report in detail on the occurrence of facultative paedomorphosis traits in a population from a Pyrenean high altitude lake.We compare its morphology, life history traits and mitochondrial DNA variation with a nearby lotic metamorphic population. Our results indicate that the lacustrine newts are smaller and present a less developed sexual dimorphism, smooth skin, and that 53% of the adults retain gills at different degrees of development, but not gill slits. Although both populations and sexes have the same age at sexual maturity (four years), the lacustrine population presents higher longevity (12 and 9 years for males and females, respectively) than the one living in the stream (8 and 9 years). The variation on the climatic conditions at altitudinal scale is probably the main cause of the differences in life history traits found between the two populations. The food availability, which could to be limiting in the lacustrine population, is another factor that can potentially affect body size. These results are congruent with the significant mitochondrial DNA genetic isolation between populations, probably a consequence of the lack of juvenile dispersal.We found low cytochrome b variability and significant genetic structuring in the lake population that is very remarkably considering the short distance to the nearby stream population and the whole species' pattern. We suggest that a bottleneck effect and/or phenotypic plasticity may have resulted in the appearance of a paedomorphic morph in the lake. © 2014 Koninklijke Brill NV, Leiden. We thank the Department of Environment and Research and the Gobierno de Aragón for their financial support to our research. Scientific capture permits were gently provided by INAGA, Gobierno de Aragón (EHV 24/2011/1470 and EHV 24/2010/9550). Peer Reviewed 2015-04-14T11:28:47Z 2015-04-14T11:28:47Z 2014 2015-04-14T11:28:47Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1163/15685381-00002921 e-issn: 1568-5381 issn: 0173-5373 Amphibia-Reptilia 35(1): 53-62 (2014) http://hdl.handle.net/10261/113650 10.1163/15685381-00002921 http://dx.doi.org/10.13039/501100010067 http://dx.doi.org/10.1163/15685381-00002921 Sí none Brill Academic Publishers |
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Calotriton asper Skeletochronology Paedomorphosis Age structure Calotriton asper Skeletochronology Paedomorphosis Age structure |
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Calotriton asper Skeletochronology Paedomorphosis Age structure Calotriton asper Skeletochronology Paedomorphosis Age structure Oromi, Neus Amat, Fèlix Sanuy, Delfi Carranza, Salvador Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) |
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The Pyrenean brook newt (Calotriton asper) is a salamandrid that mostly lives in fast running and cold mountainstreams, although some populations are also found in lakes. In the present work, we report in detail on the occurrence of facultative paedomorphosis traits in a population from a Pyrenean high altitude lake.We compare its morphology, life history traits and mitochondrial DNA variation with a nearby lotic metamorphic population. Our results indicate that the lacustrine newts are smaller and present a less developed sexual dimorphism, smooth skin, and that 53% of the adults retain gills at different degrees of development, but not gill slits. Although both populations and sexes have the same age at sexual maturity (four years), the lacustrine population presents higher longevity (12 and 9 years for males and females, respectively) than the one living in the stream (8 and 9 years). The variation on the climatic conditions at altitudinal scale is probably the main cause of the differences in life history traits found between the two populations. The food availability, which could to be limiting in the lacustrine population, is another factor that can potentially affect body size. These results are congruent with the significant mitochondrial DNA genetic isolation between populations, probably a consequence of the lack of juvenile dispersal.We found low cytochrome b variability and significant genetic structuring in the lake population that is very remarkably considering the short distance to the nearby stream population and the whole species' pattern. We suggest that a bottleneck effect and/or phenotypic plasticity may have resulted in the appearance of a paedomorphic morph in the lake. © 2014 Koninklijke Brill NV, Leiden. |
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Gobierno de Aragón |
author_facet |
Gobierno de Aragón Oromi, Neus Amat, Fèlix Sanuy, Delfi Carranza, Salvador |
format |
artículo |
topic_facet |
Calotriton asper Skeletochronology Paedomorphosis Age structure |
author |
Oromi, Neus Amat, Fèlix Sanuy, Delfi Carranza, Salvador |
author_sort |
Oromi, Neus |
title |
Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) |
title_short |
Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) |
title_full |
Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) |
title_fullStr |
Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) |
title_full_unstemmed |
Life history trait differences between a lake and a stream-dwelling population of the Pyrenean brook newt (Calotriton asper) |
title_sort |
life history trait differences between a lake and a stream-dwelling population of the pyrenean brook newt (calotriton asper) |
publisher |
Brill Academic Publishers |
publishDate |
2014 |
url |
http://hdl.handle.net/10261/113650 http://dx.doi.org/10.13039/501100010067 |
work_keys_str_mv |
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