An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea
The North Sea is heavily impacted by human activities such as overfishing and pollution. Due to their position as top predators in the ocean, marine mammals are becoming increasingly affected by anthropogenic activities. The large-scale surveys SCANS in 1994 and SCANS II in 2005 that were held in th...
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Other Authors: | , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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HAL CCSD
2014
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Online Access: | https://theses.hal.science/tel-01128126 https://theses.hal.science/tel-01128126/document https://theses.hal.science/tel-01128126/file/Mahfouz%20Celine%20thesis%20final.pdf |
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ftunivlcoteopale:oai:HAL:tel-01128126v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université du Littoral Côte d'Opale portail |
op_collection_id |
ftunivlcoteopale |
language |
English |
topic |
stable isotopes fatty acids stomach contents diet chemical contamination southern North Sea harbour porpoise isotopes stable contenus stomacaux acides gras marsouin commun sud mer du Nord contamination chimique régime alimentaire [CHIM.ANAL]Chemical Sciences/Analytical chemistry [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology |
spellingShingle |
stable isotopes fatty acids stomach contents diet chemical contamination southern North Sea harbour porpoise isotopes stable contenus stomacaux acides gras marsouin commun sud mer du Nord contamination chimique régime alimentaire [CHIM.ANAL]Chemical Sciences/Analytical chemistry [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology Mahfouz, Celine An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea |
topic_facet |
stable isotopes fatty acids stomach contents diet chemical contamination southern North Sea harbour porpoise isotopes stable contenus stomacaux acides gras marsouin commun sud mer du Nord contamination chimique régime alimentaire [CHIM.ANAL]Chemical Sciences/Analytical chemistry [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology |
description |
The North Sea is heavily impacted by human activities such as overfishing and pollution. Due to their position as top predators in the ocean, marine mammals are becoming increasingly affected by anthropogenic activities. The large-scale surveys SCANS in 1994 and SCANS II in 2005 that were held in the North Sea to estimate the abundance of small cetaceans highlighted a major shift in the distribution of harbour porpoises (Phocoena phocoena) from the northern parts of the North Sea to its eastern parts. Alongside, over the past few decades harbour porpoises stranding has increased in the southern North Sea particularly along the French and Belgian coastal waters. Since the contaminant exposure presents, among others, a potential threat to harbour porpoises inhabiting the North Sea, the first objective of the present study was to assess the contamination status of this species in the southern North Sea. On the other hand, the distribution and abundance of marine mammals is expected to follow the distribution of their main prey species. Hence, the second objective of this study was to investigate whether the changes in the distribution of porpoises in the southern North Sea may be a result of the changes in prey availability. Moreover, the third objective was to evaluate the interest of combining three methods to investigate the diet of harbour porpoises: stomach contents, stable isotopes (carbon and nitrogen) and fatty acids analyses.First, the contamination status was evaluated through the determination of two components of chemical contaminants (metals and persistent organic pollutants) in tissues of harbour porpoises stranded along the southern North Sea between 2006 and 2013. Several chemical contaminants presented higher concentrations in diseased animals compared to healthy animals. In addition, some metallic contaminants showed bioaccumulation with age. Comparison with previous study suggests that the population status of harbour porpoises in term of chemical concentration has been stable from 1994 to 2013. ... |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) National Center for Marine Sciences Lebanon National Council for Scientific Research = Conseil national de la recherche scientifique du Liban Lebanon (CNRS-L) Université du Littoral Côte d'Opale Rachid Amara Gaby Khalaf |
format |
Doctoral or Postdoctoral Thesis |
author |
Mahfouz, Celine |
author_facet |
Mahfouz, Celine |
author_sort |
Mahfouz, Celine |
title |
An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea |
title_short |
An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea |
title_full |
An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea |
title_fullStr |
An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea |
title_full_unstemmed |
An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea |
title_sort |
assessment of the chemical contamination and the diet changes of the harbour porpoise (phocoena phocoena) stranded along the southern north sea |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://theses.hal.science/tel-01128126 https://theses.hal.science/tel-01128126/document https://theses.hal.science/tel-01128126/file/Mahfouz%20Celine%20thesis%20final.pdf |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_source |
https://theses.hal.science/tel-01128126 Analytical chemistry. Université du Littoral Côte d'Opale, 2014. English. ⟨NNT : ⟩ |
op_relation |
tel-01128126 https://theses.hal.science/tel-01128126 https://theses.hal.science/tel-01128126/document https://theses.hal.science/tel-01128126/file/Mahfouz%20Celine%20thesis%20final.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1802645208646549504 |
spelling |
ftunivlcoteopale:oai:HAL:tel-01128126v1 2024-06-23T07:53:30+00:00 An assessment of the chemical contamination and the diet changes of the harbour porpoise (Phocoena phocoena) stranded along the southern North Sea Evaluation de la contamination chimique et changement du régime alimentaire des marsouins communs (Phocoena phocoena) échoués au sud de la mer du Nord Mahfouz, Celine Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) National Center for Marine Sciences Lebanon National Council for Scientific Research = Conseil national de la recherche scientifique du Liban Lebanon (CNRS-L) Université du Littoral Côte d'Opale Rachid Amara Gaby Khalaf 2014-11-26 https://theses.hal.science/tel-01128126 https://theses.hal.science/tel-01128126/document https://theses.hal.science/tel-01128126/file/Mahfouz%20Celine%20thesis%20final.pdf en eng HAL CCSD tel-01128126 https://theses.hal.science/tel-01128126 https://theses.hal.science/tel-01128126/document https://theses.hal.science/tel-01128126/file/Mahfouz%20Celine%20thesis%20final.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01128126 Analytical chemistry. Université du Littoral Côte d'Opale, 2014. English. ⟨NNT : ⟩ stable isotopes fatty acids stomach contents diet chemical contamination southern North Sea harbour porpoise isotopes stable contenus stomacaux acides gras marsouin commun sud mer du Nord contamination chimique régime alimentaire [CHIM.ANAL]Chemical Sciences/Analytical chemistry [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology info:eu-repo/semantics/doctoralThesis Theses 2014 ftunivlcoteopale 2024-06-06T23:35:57Z The North Sea is heavily impacted by human activities such as overfishing and pollution. Due to their position as top predators in the ocean, marine mammals are becoming increasingly affected by anthropogenic activities. The large-scale surveys SCANS in 1994 and SCANS II in 2005 that were held in the North Sea to estimate the abundance of small cetaceans highlighted a major shift in the distribution of harbour porpoises (Phocoena phocoena) from the northern parts of the North Sea to its eastern parts. Alongside, over the past few decades harbour porpoises stranding has increased in the southern North Sea particularly along the French and Belgian coastal waters. Since the contaminant exposure presents, among others, a potential threat to harbour porpoises inhabiting the North Sea, the first objective of the present study was to assess the contamination status of this species in the southern North Sea. On the other hand, the distribution and abundance of marine mammals is expected to follow the distribution of their main prey species. Hence, the second objective of this study was to investigate whether the changes in the distribution of porpoises in the southern North Sea may be a result of the changes in prey availability. Moreover, the third objective was to evaluate the interest of combining three methods to investigate the diet of harbour porpoises: stomach contents, stable isotopes (carbon and nitrogen) and fatty acids analyses.First, the contamination status was evaluated through the determination of two components of chemical contaminants (metals and persistent organic pollutants) in tissues of harbour porpoises stranded along the southern North Sea between 2006 and 2013. Several chemical contaminants presented higher concentrations in diseased animals compared to healthy animals. In addition, some metallic contaminants showed bioaccumulation with age. Comparison with previous study suggests that the population status of harbour porpoises in term of chemical concentration has been stable from 1994 to 2013. ... Doctoral or Postdoctoral Thesis Harbour porpoise Phocoena phocoena Université du Littoral Côte d'Opale portail |