Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay
The ecological functioning of coastal ecosystems is subjected to the synergistic action of climate change and anthropogenic pressures. In Arcachon Bay, the reproductive cycle of the oyster Crassostrea gigas has changed in recent years (e.g. weak gametogenesis, spawning delay). This pattern seems to...
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Other Authors: | , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2017
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Subjects: | |
Online Access: | https://theses.hal.science/tel-01627687 https://theses.hal.science/tel-01627687/document https://theses.hal.science/tel-01627687/file/GASMI_SONIA_2017.pdf |
id |
ftunivnantes:oai:HAL:tel-01627687v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
French |
topic |
Reproduction Hydrodynamics Spatio-temporal variability Nutrition Phytoplankto Stables isotopes Fatty acids Hydrodynamisme Variabilité spatio-temporelle Pool nutritif Phytoplancton Isotopes stables Acides gras [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Reproduction Hydrodynamics Spatio-temporal variability Nutrition Phytoplankto Stables isotopes Fatty acids Hydrodynamisme Variabilité spatio-temporelle Pool nutritif Phytoplancton Isotopes stables Acides gras [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Gasmi, Sonia Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay |
topic_facet |
Reproduction Hydrodynamics Spatio-temporal variability Nutrition Phytoplankto Stables isotopes Fatty acids Hydrodynamisme Variabilité spatio-temporelle Pool nutritif Phytoplancton Isotopes stables Acides gras [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
The ecological functioning of coastal ecosystems is subjected to the synergistic action of climate change and anthropogenic pressures. In Arcachon Bay, the reproductive cycle of the oyster Crassostrea gigas has changed in recent years (e.g. weak gametogenesis, spawning delay). This pattern seems to be associated with global changes in thermal and trophic conditions. The aim of this work was to characterize the spatio-temporal variability in the reproductive investment of oysters in Arcachon Bay. This variability has been investigated in relation to the origin, quantity and quality of the trophic resources. The results revealed important spatial gradients of variability in gonadal development and trophic signal in C. gigas, between inner parts of the bay influenced by river inputs (south-east and north-east) and the external part of the bay, which is influenced by oceanic inputs. Two hydrodynamic factors explained most of the observed variability: immersion time and oceanic water renewal. A comparison of C. gigas gametogenesis and the nutritional value of available food sources between the south-eastern and north-eastern parts of the bay revealed temporal variability in the composition of phytoplankton. This variability was associated with variability in the amounts of essential fatty acids, necessary for gametogenesis. Changes in energy reserves and gamete release cycle were synchronized with the seasonal nutrient variability. These results constitute a first approach in the development of a model predicting the evolution of the energetic needs of C. gigas under the global change in environmental conditions. Le fonctionnement écologique des écosystèmes côtiers est soumis à l’action synergique des changements climatiques et des pressions anthropiques. Au sein du Bassin d’Arcachon, l’huître Crassostrea gigas, montre depuis quelques années une modification du cycle reproductif (i.e. faible formation des gamètes, retard de ponte), qui semble lié aux modifications globales des conditions thermiques et trophiques du ... |
author2 |
UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Université de Bordeaux Gwenaël Abril Valérie David Philippe Soudant |
format |
Doctoral or Postdoctoral Thesis |
author |
Gasmi, Sonia |
author_facet |
Gasmi, Sonia |
author_sort |
Gasmi, Sonia |
title |
Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay |
title_short |
Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay |
title_full |
Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay |
title_fullStr |
Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay |
title_full_unstemmed |
Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay |
title_sort |
trophic ecology and reproduction in the wild population of the pacific oyster crassostrea gigas from a shallow macrotidal ecosystem : case of arcachon bay |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://theses.hal.science/tel-01627687 https://theses.hal.science/tel-01627687/document https://theses.hal.science/tel-01627687/file/GASMI_SONIA_2017.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Crassostrea gigas Pacific oyster |
genre_facet |
Crassostrea gigas Pacific oyster |
op_source |
https://theses.hal.science/tel-01627687 Sciences de la Terre. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0626⟩ |
op_relation |
NNT: 2017BORD0626 tel-01627687 https://theses.hal.science/tel-01627687 https://theses.hal.science/tel-01627687/document https://theses.hal.science/tel-01627687/file/GASMI_SONIA_2017.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766393442402828288 |
spelling |
ftunivnantes:oai:HAL:tel-01627687v1 2023-05-15T15:57:45+02:00 Trophic ecology and reproduction in the wild population of the Pacific oyster Crassostrea gigas from a shallow macrotidal ecosystem : case of Arcachon Bay Ecologie trophique et reproduction d'une population sauvage d'huître creuse Crassostrea gigas dans un écosystème macrotidal, peu profond : cas du Bassin d'Arcachon Gasmi, Sonia UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) Université de Bordeaux Gwenaël Abril Valérie David Philippe Soudant 2017-06-22 https://theses.hal.science/tel-01627687 https://theses.hal.science/tel-01627687/document https://theses.hal.science/tel-01627687/file/GASMI_SONIA_2017.pdf fr fre HAL CCSD NNT: 2017BORD0626 tel-01627687 https://theses.hal.science/tel-01627687 https://theses.hal.science/tel-01627687/document https://theses.hal.science/tel-01627687/file/GASMI_SONIA_2017.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01627687 Sciences de la Terre. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0626⟩ Reproduction Hydrodynamics Spatio-temporal variability Nutrition Phytoplankto Stables isotopes Fatty acids Hydrodynamisme Variabilité spatio-temporelle Pool nutritif Phytoplancton Isotopes stables Acides gras [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2017 ftunivnantes 2023-02-08T09:08:28Z The ecological functioning of coastal ecosystems is subjected to the synergistic action of climate change and anthropogenic pressures. In Arcachon Bay, the reproductive cycle of the oyster Crassostrea gigas has changed in recent years (e.g. weak gametogenesis, spawning delay). This pattern seems to be associated with global changes in thermal and trophic conditions. The aim of this work was to characterize the spatio-temporal variability in the reproductive investment of oysters in Arcachon Bay. This variability has been investigated in relation to the origin, quantity and quality of the trophic resources. The results revealed important spatial gradients of variability in gonadal development and trophic signal in C. gigas, between inner parts of the bay influenced by river inputs (south-east and north-east) and the external part of the bay, which is influenced by oceanic inputs. Two hydrodynamic factors explained most of the observed variability: immersion time and oceanic water renewal. A comparison of C. gigas gametogenesis and the nutritional value of available food sources between the south-eastern and north-eastern parts of the bay revealed temporal variability in the composition of phytoplankton. This variability was associated with variability in the amounts of essential fatty acids, necessary for gametogenesis. Changes in energy reserves and gamete release cycle were synchronized with the seasonal nutrient variability. These results constitute a first approach in the development of a model predicting the evolution of the energetic needs of C. gigas under the global change in environmental conditions. Le fonctionnement écologique des écosystèmes côtiers est soumis à l’action synergique des changements climatiques et des pressions anthropiques. Au sein du Bassin d’Arcachon, l’huître Crassostrea gigas, montre depuis quelques années une modification du cycle reproductif (i.e. faible formation des gamètes, retard de ponte), qui semble lié aux modifications globales des conditions thermiques et trophiques du ... Doctoral or Postdoctoral Thesis Crassostrea gigas Pacific oyster Université de Nantes: HAL-UNIV-NANTES Pacific |