Life histories and evolution: insights from notothenioids (Teleostei, Perciformes)
ABSTRACT Organisms show an extraordinary variation in their life history traits, both at inter- and intraspecific level, exhibiting phenotypic variations among populations inhabiting different habitat. The variability in life history traits has been related to environmental conditions, as a result o...
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ftunivpadovairis:oai:www.research.unipd.it:11577/3424747 2024-04-14T08:02:21+00:00 Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) Riginella, Emilio Pilastro, Andrea Riginella, Emilio 2015 http://hdl.handle.net/11577/3424747 eng eng Università degli studi di Padova numberofpages:189 alleditors:Pilastro, Andrea http://hdl.handle.net/11577/3424747 info:eu-repo/semantics/openAccess Evoluzione tratti dei cicli biologici pesci antartici nototenioidei riproduzione in pesci. Evolution life history traits Antarctic fish notothenioids fish reproduction Settore BIO/06 - Anatomia Comparata e Citologia Settore BIO/05 - Zoologia info:eu-repo/semantics/doctoralThesis 2015 ftunivpadovairis 2024-03-21T20:00:03Z ABSTRACT Organisms show an extraordinary variation in their life history traits, both at inter- and intraspecific level, exhibiting phenotypic variations among populations inhabiting different habitat. The variability in life history traits has been related to environmental conditions, as a result of selective processes or phenotypic response to them. In addition to the huge diversity in life history traits, several trade-offs among them have been recognized. The variability in life history traits and in their trade-offs related to environmental conditions represents a key aspect in the study of evolutionary processes. A wide variation in life history traits is documented among teleost fishes, both among and within species, reflecting the effects of evolutionary forces acting on them over time and across environmental conditions. Several life history traits, such as growth rate, age at sexual maturity, fecundity, reproductive investment, egg size, hatching size, are strongly influenced by temperature and food availability. Notothenioid fish represent a unique example of fish adaptive radiation in marine environment. They dominate the waters surrounding the Antarctic continent both by species number, with over 120 species (47%), and biomass (90-95%). Notothenioids distribution is limited exclusively to the Antarctic and sub-Antarctic regions (South America, New Zealand and South East Australia). Variability in their life history traits at inter- and intra-specific levels has been described, with a latitudinal trends in some reproductive traits. In this framework, despite the availability of recent phylogenies of notothenioids, a comparative analysis aimed at studying habitat dependent evolution of reproductive strategies has not yet been performed. Given the particular characteristics of their habitats and the uniqueness of notothenioid fishes, they can be considered an excellent taxon model to investigate the evolution of life history traits in relation to environmental factors. The aim of this PhD project was ... Doctoral or Postdoctoral Thesis Antarc* Antarctic antartic* Padua Research Archive (IRIS - Università degli Studi di Padova) Antarctic The Antarctic New Zealand |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
Evoluzione tratti dei cicli biologici pesci antartici nototenioidei riproduzione in pesci. Evolution life history traits Antarctic fish notothenioids fish reproduction Settore BIO/06 - Anatomia Comparata e Citologia Settore BIO/05 - Zoologia |
spellingShingle |
Evoluzione tratti dei cicli biologici pesci antartici nototenioidei riproduzione in pesci. Evolution life history traits Antarctic fish notothenioids fish reproduction Settore BIO/06 - Anatomia Comparata e Citologia Settore BIO/05 - Zoologia Riginella, Emilio Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) |
topic_facet |
Evoluzione tratti dei cicli biologici pesci antartici nototenioidei riproduzione in pesci. Evolution life history traits Antarctic fish notothenioids fish reproduction Settore BIO/06 - Anatomia Comparata e Citologia Settore BIO/05 - Zoologia |
description |
ABSTRACT Organisms show an extraordinary variation in their life history traits, both at inter- and intraspecific level, exhibiting phenotypic variations among populations inhabiting different habitat. The variability in life history traits has been related to environmental conditions, as a result of selective processes or phenotypic response to them. In addition to the huge diversity in life history traits, several trade-offs among them have been recognized. The variability in life history traits and in their trade-offs related to environmental conditions represents a key aspect in the study of evolutionary processes. A wide variation in life history traits is documented among teleost fishes, both among and within species, reflecting the effects of evolutionary forces acting on them over time and across environmental conditions. Several life history traits, such as growth rate, age at sexual maturity, fecundity, reproductive investment, egg size, hatching size, are strongly influenced by temperature and food availability. Notothenioid fish represent a unique example of fish adaptive radiation in marine environment. They dominate the waters surrounding the Antarctic continent both by species number, with over 120 species (47%), and biomass (90-95%). Notothenioids distribution is limited exclusively to the Antarctic and sub-Antarctic regions (South America, New Zealand and South East Australia). Variability in their life history traits at inter- and intra-specific levels has been described, with a latitudinal trends in some reproductive traits. In this framework, despite the availability of recent phylogenies of notothenioids, a comparative analysis aimed at studying habitat dependent evolution of reproductive strategies has not yet been performed. Given the particular characteristics of their habitats and the uniqueness of notothenioid fishes, they can be considered an excellent taxon model to investigate the evolution of life history traits in relation to environmental factors. The aim of this PhD project was ... |
author2 |
Pilastro, Andrea Riginella, Emilio |
format |
Doctoral or Postdoctoral Thesis |
author |
Riginella, Emilio |
author_facet |
Riginella, Emilio |
author_sort |
Riginella, Emilio |
title |
Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) |
title_short |
Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) |
title_full |
Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) |
title_fullStr |
Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) |
title_full_unstemmed |
Life histories and evolution: insights from notothenioids (Teleostei, Perciformes) |
title_sort |
life histories and evolution: insights from notothenioids (teleostei, perciformes) |
publisher |
Università degli studi di Padova |
publishDate |
2015 |
url |
http://hdl.handle.net/11577/3424747 |
geographic |
Antarctic The Antarctic New Zealand |
geographic_facet |
Antarctic The Antarctic New Zealand |
genre |
Antarc* Antarctic antartic* |
genre_facet |
Antarc* Antarctic antartic* |
op_relation |
numberofpages:189 alleditors:Pilastro, Andrea http://hdl.handle.net/11577/3424747 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1796314280699625472 |