Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic
International audience Harbor porpoises exhibit early maturation, relatively short gestation/lactation periods and a faster rate of reproduction as compared to other cetacean species. Intrinsic and extrinsic factors can influence both population vital rates and population structure, which ultimately...
Published in: | Frontiers in Marine Science |
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ftsorbonneuniv:oai:HAL:hal-03095224v1 2024-09-15T18:24:42+00:00 Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic Murphy, Sinéad Petitguyot, Marie Jepson, Paul Deaville, Rob Lockyer, Christina Barnett, James Perkins, Matthew Penrose, Rod Davison, Nicholas Minto, Cóilín National University of Ireland Galway (NUI Galway) Sorbonne Université - UFR d'Ingénierie (UFR 919) Sorbonne Université (SU) Zoological Society of London University of Exeter Scotland's Rural College (SRUC) 2020-11-26 https://hal.sorbonne-universite.fr/hal-03095224 https://hal.sorbonne-universite.fr/hal-03095224/document https://hal.sorbonne-universite.fr/hal-03095224/file/fmars-07-502352.pdf https://doi.org/10.3389/fmars.2020.502352 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2020.502352 hal-03095224 https://hal.sorbonne-universite.fr/hal-03095224 https://hal.sorbonne-universite.fr/hal-03095224/document https://hal.sorbonne-universite.fr/hal-03095224/file/fmars-07-502352.pdf doi:10.3389/fmars.2020.502352 info:eu-repo/semantics/OpenAccess ISSN: 2296-7745 Frontiers in Marine Science https://hal.sorbonne-universite.fr/hal-03095224 Frontiers in Marine Science, 2020, 7, ⟨10.3389/fmars.2020.502352⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftsorbonneuniv https://doi.org/10.3389/fmars.2020.502352 2024-07-25T23:47:56Z International audience Harbor porpoises exhibit early maturation, relatively short gestation/lactation periods and a faster rate of reproduction as compared to other cetacean species. Intrinsic and extrinsic factors can influence both population vital rates and population structure, which ultimately cause changes in dynamics within and between populations. Here, we undertook a retrospective analysis of mortality data collected over a 24-year period for assessing life history traits of the North-east Atlantic harbor porpoise population. We use time-period specific models for key life history relationships that considered cause of death of individuals (as a proxy for health status), sex and management unit (MU). Sexual variation in asymptotic length, asymptotic age, average length at 50% maturity (L50) and average age at 50% maturity (A50) were observed, with females attaining a larger asymptotic length, larger L50, and delaying attainment of both sexual and physical maturity, compared to males. While females are constrained in their minimum body size due to giving birth to proportionally larger offspring, males exhibited more plasticity in size at sexual maturity, enabling re-allocation of available energy resources toward reproduction. Data were then used to compare biological parameters among two porpoise MUs in United Kingdom waters, both of which in the current study exhibited reduced reproductive rates compared to other geographic regions. In both MUs, females significantly increased their A50 and males significantly declined in their L50. An increase in the age at asymptotic length was also observed in both sexes, along with a significant decline in the Gompertz growth rate parameter that was more apparent in the female data. While availability of suitable prey resources may be a limiting factor, a combination of other factors cannot be ruled out. Porpoises in the Celtic and Irish Seas MU were significantly larger in their maximum length, asymptotic length and L50 compared to porpoises in the North Sea MU ... Article in Journal/Newspaper North East Atlantic HAL Sorbonne Université Frontiers in Marine Science 7 |
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HAL Sorbonne Université |
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ftsorbonneuniv |
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English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Murphy, Sinéad Petitguyot, Marie Jepson, Paul Deaville, Rob Lockyer, Christina Barnett, James Perkins, Matthew Penrose, Rod Davison, Nicholas Minto, Cóilín Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Harbor porpoises exhibit early maturation, relatively short gestation/lactation periods and a faster rate of reproduction as compared to other cetacean species. Intrinsic and extrinsic factors can influence both population vital rates and population structure, which ultimately cause changes in dynamics within and between populations. Here, we undertook a retrospective analysis of mortality data collected over a 24-year period for assessing life history traits of the North-east Atlantic harbor porpoise population. We use time-period specific models for key life history relationships that considered cause of death of individuals (as a proxy for health status), sex and management unit (MU). Sexual variation in asymptotic length, asymptotic age, average length at 50% maturity (L50) and average age at 50% maturity (A50) were observed, with females attaining a larger asymptotic length, larger L50, and delaying attainment of both sexual and physical maturity, compared to males. While females are constrained in their minimum body size due to giving birth to proportionally larger offspring, males exhibited more plasticity in size at sexual maturity, enabling re-allocation of available energy resources toward reproduction. Data were then used to compare biological parameters among two porpoise MUs in United Kingdom waters, both of which in the current study exhibited reduced reproductive rates compared to other geographic regions. In both MUs, females significantly increased their A50 and males significantly declined in their L50. An increase in the age at asymptotic length was also observed in both sexes, along with a significant decline in the Gompertz growth rate parameter that was more apparent in the female data. While availability of suitable prey resources may be a limiting factor, a combination of other factors cannot be ruled out. Porpoises in the Celtic and Irish Seas MU were significantly larger in their maximum length, asymptotic length and L50 compared to porpoises in the North Sea MU ... |
author2 |
National University of Ireland Galway (NUI Galway) Sorbonne Université - UFR d'Ingénierie (UFR 919) Sorbonne Université (SU) Zoological Society of London University of Exeter Scotland's Rural College (SRUC) |
format |
Article in Journal/Newspaper |
author |
Murphy, Sinéad Petitguyot, Marie Jepson, Paul Deaville, Rob Lockyer, Christina Barnett, James Perkins, Matthew Penrose, Rod Davison, Nicholas Minto, Cóilín |
author_facet |
Murphy, Sinéad Petitguyot, Marie Jepson, Paul Deaville, Rob Lockyer, Christina Barnett, James Perkins, Matthew Penrose, Rod Davison, Nicholas Minto, Cóilín |
author_sort |
Murphy, Sinéad |
title |
Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic |
title_short |
Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic |
title_full |
Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic |
title_fullStr |
Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic |
title_full_unstemmed |
Spatio-Temporal Variability of Harbor Porpoise Life History Parameters in the North-East Atlantic |
title_sort |
spatio-temporal variability of harbor porpoise life history parameters in the north-east atlantic |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.sorbonne-universite.fr/hal-03095224 https://hal.sorbonne-universite.fr/hal-03095224/document https://hal.sorbonne-universite.fr/hal-03095224/file/fmars-07-502352.pdf https://doi.org/10.3389/fmars.2020.502352 |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
ISSN: 2296-7745 Frontiers in Marine Science https://hal.sorbonne-universite.fr/hal-03095224 Frontiers in Marine Science, 2020, 7, ⟨10.3389/fmars.2020.502352⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2020.502352 hal-03095224 https://hal.sorbonne-universite.fr/hal-03095224 https://hal.sorbonne-universite.fr/hal-03095224/document https://hal.sorbonne-universite.fr/hal-03095224/file/fmars-07-502352.pdf doi:10.3389/fmars.2020.502352 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/fmars.2020.502352 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
_version_ |
1810465102929854464 |