Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System

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Tesis (PhD.). -- Université Montpellier. Spécialité : Biologie des populations et écologie
Detalles Bibliográficos
Autor: Alegre Norza Sior, Ana Renza Paola
Formato: tesis de maestría
Fecha de Publicación:2015
Institución:Instituto del Mar del Perú
Repositorio:IMARPE-Institucional
Lenguaje:español
OAI Identifier:oai:repositorio.imarpe.gob.pe:20.500.12958/2344
Enlace del recurso:https://hdl.handle.net/20.500.12958/2344
Nivel de acceso:acceso abierto
Materia:Ecología Trófica
Calamar Gigante
Dosidicus Gigas
Corriente De Humboldt
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spelling Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current SystemAlegre Norza Sior, Ana Renza PaolaEcología TróficaCalamar GiganteDosidicus GigasCorriente De HumboldtTesis (PhD.). -- Université Montpellier. Spécialité : Biologie des populations et écologieThis work provides a contribution to a better understanding of the trophic ecology of important predators in the Northern Humboldt Current System, the jack mackerel (Trachurus murphyi), the chub mackerel (Scomber japonicus) and the jumbo squid (Dosidicus gigas) by the characterization of the highly variable feeding patterns of these species at different spatiotemporal scales. We provided new knowledge on the comparative trophic behaviour of these species, defined as opportunistic in previous investigations. For that purpose we applied a variety of statistical methods to an extensive dataset of 27,188 non-empty stomachs. We defined the spatial organization of the forage fauna of these predators and documented changes in prey composition according to predators’ size and spatiotemporal features of environment. Our results highligh the key role played by the dissolved oxygen. We also deciphered an important paradox on the jumbo squid diet: why do they hardly forage on the huge anchovy (Engraulis ringens) biomass distributed of coastal Peru? We showed that the shallow oxygen minimum zone present off coastal Peru could hamper the co-occurrence of jumbo squids and anchovies. In addition, we proposed a conceptual model on jumbo squid trophic ecology including the ontogenetic cycle, oxygen and prey availability. Moreover we showed that the trophic behaviour of jack mackerel and chub mackerel is adapted to forage on more accessible species such as for example the squat lobster Pleurocondes monodon and Zoea larvae. Besides, both predators present a trophic overlap. But jack mackerel was not as oracious as chub mackerel, contradictorily to what was observed by others authors. Fish diet presented a high spatiotemporal variability, and the shelf break appeared as a strong biogeographical frontier. Diet composition of our fish predators was not necessarily a consistent indicator of changes in prey biomass. El Niño events had a weak effect on the stomach fullness and diet composition of chub mackerel and jack mackerel. Moreover, decadal changes in diet diversity challenged the classic paradigm of positive correlation between species richness and temperature. Finally, the global patterns that we described in this work, illustrated the opportunistic foraging behaviour, life strategies and the high degree of plasticity of these species. Such behaviour allows adaptation to changes in the environment.Université Montpellier. Spécialité2015-09-30T20:11:32Z2015-09-30T20:11:32Z2015info:eu-repo/semantics/masterThesisapplication/pdfhttps://hdl.handle.net/20.500.12958/2344Instituto del Mar del Perú - IMARPERepositorio Digital IMARPEreponame:IMARPE-Institucionalinstname:Instituto del Mar del Perúinstacron:IMARPEspainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/4.0/oai:repositorio.imarpe.gob.pe:20.500.12958/23442021-06-11T08:08:15Z
dc.title.none.fl_str_mv Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
title Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
spellingShingle Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
Alegre Norza Sior, Ana Renza Paola
Ecología Trófica
Calamar Gigante
Dosidicus Gigas
Corriente De Humboldt
title_short Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
title_full Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
title_fullStr Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
title_full_unstemmed Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
title_sort Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
dc.creator.none.fl_str_mv Alegre Norza Sior, Ana Renza Paola
author Alegre Norza Sior, Ana Renza Paola
author_facet Alegre Norza Sior, Ana Renza Paola
author_role author
dc.subject.none.fl_str_mv Ecología Trófica
Calamar Gigante
Dosidicus Gigas
Corriente De Humboldt
topic Ecología Trófica
Calamar Gigante
Dosidicus Gigas
Corriente De Humboldt
description Tesis (PhD.). -- Université Montpellier. Spécialité : Biologie des populations et écologie
publishDate 2015
dc.date.none.fl_str_mv 2015-09-30T20:11:32Z
2015-09-30T20:11:32Z
2015
dc.type.none.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.12958/2344
url https://hdl.handle.net/20.500.12958/2344
dc.language.none.fl_str_mv spa
language spa
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/4.0/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Université Montpellier. Spécialité
publisher.none.fl_str_mv Université Montpellier. Spécialité
dc.source.none.fl_str_mv Instituto del Mar del Perú - IMARPE
Repositorio Digital IMARPE
reponame:IMARPE-Institucional
instname:Instituto del Mar del Perú
instacron:IMARPE
instname_str Instituto del Mar del Perú
instacron_str IMARPE
institution IMARPE
reponame_str IMARPE-Institucional
collection IMARPE-Institucional
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1816344666653589504
score 13.922664
Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System
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