Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin
International audience Small pelagic fish play a significant role in regulating the foraging activities and population trends of marine top predators in upwelling ecosystems, yet there is little information on oceanographic drivers of fish assemblages at temporal and spatial scales relevant to their...
Published in: | Marine Ecology Progress Series |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-01630751 https://doi.org/10.3354/meps12089 |
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ftccsdartic:oai:HAL:hal-01630751v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Marine top predators Schooling fish Oceanographic processes Acoustic surveys Spheniscus demersus Benguela upwelling Predator-prey interaction · Algoa Bay [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
Marine top predators Schooling fish Oceanographic processes Acoustic surveys Spheniscus demersus Benguela upwelling Predator-prey interaction · Algoa Bay [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] McInnes, Alistair M. Ryan, Peter G. Lacerda, Miguel Deshayes, Julie Goschen, Wayne S. Pichegru, Lorien Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin |
topic_facet |
Marine top predators Schooling fish Oceanographic processes Acoustic surveys Spheniscus demersus Benguela upwelling Predator-prey interaction · Algoa Bay [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience Small pelagic fish play a significant role in regulating the foraging activities and population trends of marine top predators in upwelling ecosystems, yet there is little information on oceanographic drivers of fish assemblages at temporal and spatial scales relevant to their predators. The survival of the Endangered African penguin Spheniscus demersus is closely linked to the availability of pelagic fish prey. This study assesses the influence of oceanographic variables on the spatio-temporal dynamics of pelagic fish in Algoa Bay, South Africa, where half of the world population of African penguins breed on 2 islands, St Croix and Bird. Using small-scale acoustic surveys and an array of underwater oceanographic data recorders spread across the bay during 3 yr, we reveal the complex and variable nature of this system, with fish responding differently to physical processes around each island. Chlorophyll a concentrations were good predictors of relative fish abundance around Bird Island but had little influence around St Croix Island, possibly due to the masking effect of purse-seine fishing around this site. The horizontal distribution of fish schools around Bird Island was more aggregated under upwelling conditions (cooler sea surface temperatures) and the vertical distribution of fish around both islands was strongly influenced by stratification and mean temperatures. Mechanistic drivers of upwelling included northeasterly winds and offshore Natal pulses, both of which are predicted to have an increasingly more significant effect on the suitability of habitat for pelagic fish and associated predators under the influences of climate change and industrial fishing. |
author2 |
DST/NRF Centre of Excellence University of Cape Town-Percy FitzPatrick Institute of African Ornithology Department of Statistical Sciences University of Cape Town Nucleus for European Modeling of the Ocean (NEMO R&D ) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) South African Environmental Observation Network Pretoria (SAEON) |
format |
Article in Journal/Newspaper |
author |
McInnes, Alistair M. Ryan, Peter G. Lacerda, Miguel Deshayes, Julie Goschen, Wayne S. Pichegru, Lorien |
author_facet |
McInnes, Alistair M. Ryan, Peter G. Lacerda, Miguel Deshayes, Julie Goschen, Wayne S. Pichegru, Lorien |
author_sort |
McInnes, Alistair M. |
title |
Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin |
title_short |
Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin |
title_full |
Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin |
title_fullStr |
Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin |
title_full_unstemmed |
Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin |
title_sort |
small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered african penguin |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.archives-ouvertes.fr/hal-01630751 https://doi.org/10.3354/meps12089 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(-55.681,-55.681,51.483,51.483) ENVELOPE(-96.757,-96.757,58.948,58.948) |
geographic |
Bird Island Croix Island St. Croix Island |
geographic_facet |
Bird Island Croix Island St. Croix Island |
genre |
Bird Island |
genre_facet |
Bird Island |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.archives-ouvertes.fr/hal-01630751 Marine Ecology Progress Series, Inter Research, 2017, 569, pp.187-203. ⟨10.3354/meps12089⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12089 hal-01630751 https://hal.archives-ouvertes.fr/hal-01630751 doi:10.3354/meps12089 BIBCODE: 2017MEPS.569.187M |
op_doi |
https://doi.org/10.3354/meps12089 |
container_title |
Marine Ecology Progress Series |
container_volume |
569 |
container_start_page |
187 |
op_container_end_page |
203 |
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1766379056836640768 |
spelling |
ftccsdartic:oai:HAL:hal-01630751v1 2023-05-15T15:44:41+02:00 Small pelagic fish responses to fine-scale oceanographic conditions: implications for the endangered African penguin McInnes, Alistair M. Ryan, Peter G. Lacerda, Miguel Deshayes, Julie Goschen, Wayne S. Pichegru, Lorien DST/NRF Centre of Excellence University of Cape Town-Percy FitzPatrick Institute of African Ornithology Department of Statistical Sciences University of Cape Town Nucleus for European Modeling of the Ocean (NEMO R&D ) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) South African Environmental Observation Network Pretoria (SAEON) 2017 https://hal.archives-ouvertes.fr/hal-01630751 https://doi.org/10.3354/meps12089 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12089 hal-01630751 https://hal.archives-ouvertes.fr/hal-01630751 doi:10.3354/meps12089 BIBCODE: 2017MEPS.569.187M ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.archives-ouvertes.fr/hal-01630751 Marine Ecology Progress Series, Inter Research, 2017, 569, pp.187-203. ⟨10.3354/meps12089⟩ Marine top predators Schooling fish Oceanographic processes Acoustic surveys Spheniscus demersus Benguela upwelling Predator-prey interaction · Algoa Bay [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2017 ftccsdartic https://doi.org/10.3354/meps12089 2021-12-05T02:46:38Z International audience Small pelagic fish play a significant role in regulating the foraging activities and population trends of marine top predators in upwelling ecosystems, yet there is little information on oceanographic drivers of fish assemblages at temporal and spatial scales relevant to their predators. The survival of the Endangered African penguin Spheniscus demersus is closely linked to the availability of pelagic fish prey. This study assesses the influence of oceanographic variables on the spatio-temporal dynamics of pelagic fish in Algoa Bay, South Africa, where half of the world population of African penguins breed on 2 islands, St Croix and Bird. Using small-scale acoustic surveys and an array of underwater oceanographic data recorders spread across the bay during 3 yr, we reveal the complex and variable nature of this system, with fish responding differently to physical processes around each island. Chlorophyll a concentrations were good predictors of relative fish abundance around Bird Island but had little influence around St Croix Island, possibly due to the masking effect of purse-seine fishing around this site. The horizontal distribution of fish schools around Bird Island was more aggregated under upwelling conditions (cooler sea surface temperatures) and the vertical distribution of fish around both islands was strongly influenced by stratification and mean temperatures. Mechanistic drivers of upwelling included northeasterly winds and offshore Natal pulses, both of which are predicted to have an increasingly more significant effect on the suitability of habitat for pelagic fish and associated predators under the influences of climate change and industrial fishing. Article in Journal/Newspaper Bird Island Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Croix Island ENVELOPE(-55.681,-55.681,51.483,51.483) St. Croix Island ENVELOPE(-96.757,-96.757,58.948,58.948) Marine Ecology Progress Series 569 187 203 |