Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour

Detalhes bibliográficos
Autor(a) principal: Gomes, Matilde Juliana Duarte
Data de Publicação: 2022
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/58323
Resumo: Tese de mestrado, Ecologia Marinha , 2022, Universidade de Lisboa, Faculdade de Ciências
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spelling Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviourHippocampus hippocampusonda de calor marinhahipóxiacomportamentometabolismoTeses de mestrado - 2022Departamento de Biologia AnimalTese de mestrado, Ecologia Marinha , 2022, Universidade de Lisboa, Faculdade de CiênciasSeahorses are teleost fish with unusual anatomical and behavioural characteristics, that make them one of the most unique and enigmatic animals. They are recognized as flagship species for several conservation issues. Unfortunately, seahorses’ populations have been declining worldwide, mainly due to anthropogenic pressure. Their unique lifestyle, namely, their reduced swimming ability, small distribution, high site fidelity and monogamy, constrains their ability to migrate, adapt and evolve in future climate scenarios, especially when exposed to short-term extreme events such as marine heatwaves and acute hypoxia. Yet, seahorses inhabit shallow coastal waters that display daily or seasonal fluctuations of temperature and oxygen, which suggests that these animals may show some phenotypic plasticity to these environmental changes. Within this context, the objective of this dissertation was to test the individual and combined effects of a category II (strong) marine heatwave (21.5°C) and an extreme hypoxia exposure (~27% dissolved oxygen) on the metabolism, behaviour and food intake of the temperate seahorse Hippocampus hippocampus. Concomitantly, the impact of the marine heatwave on the number and size of seahorses oocytes was also examined. Regarding metabolism, hypoxia exposure, alone or accompanied by the marine heatwave, led to a significant reduction in metabolic and ventilation rates. The metabolic rates under the combined treatment were slightly higher than that of those exposed to hypoxia, which may indicate a temperature compensation in relation to oxygen depletion. The marine heatwave treatment led to a significant increase in ventilation rates and food intake, but did not change seahorse behavioural patterns. In contrast, seahorses showed signs of movement lethargy whenever there was oxygen depletion. The number and size of the oocytes increased significantly with increasing temperature. The results show that, although seahorses may have some adaptation elasticity to heat stress, an extreme decrease in dissolved oxygen results in metabolic and behavioural changes that may jeopardize the development and survival of these iconic organisms. The two stressors together have similar impacts to those observed in the hypoxia treatment, which suggests that oxygen depletion elicits greater biological effects than strong marine heatwaves.Pimentel, MartaRosa, Rui Afonso Bairrão da, 1976-Repositório da Universidade de LisboaGomes, Matilde Juliana Duarte2023-12-30T01:31:38Z202220222022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10451/58323enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-01T01:16:29Zoai:repositorio.ul.pt:10451/58323Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:08:37.081385Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
title Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
spellingShingle Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
Gomes, Matilde Juliana Duarte
Hippocampus hippocampus
onda de calor marinha
hipóxia
comportamento
metabolismo
Teses de mestrado - 2022
Departamento de Biologia Animal
title_short Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
title_full Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
title_fullStr Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
title_full_unstemmed Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
title_sort Impacts of marine heatwaves and acute hypoxia on the short-snouted seahorse metabolism and behaviour
author Gomes, Matilde Juliana Duarte
author_facet Gomes, Matilde Juliana Duarte
author_role author
dc.contributor.none.fl_str_mv Pimentel, Marta
Rosa, Rui Afonso Bairrão da, 1976-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Gomes, Matilde Juliana Duarte
dc.subject.por.fl_str_mv Hippocampus hippocampus
onda de calor marinha
hipóxia
comportamento
metabolismo
Teses de mestrado - 2022
Departamento de Biologia Animal
topic Hippocampus hippocampus
onda de calor marinha
hipóxia
comportamento
metabolismo
Teses de mestrado - 2022
Departamento de Biologia Animal
description Tese de mestrado, Ecologia Marinha , 2022, Universidade de Lisboa, Faculdade de Ciências
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022-01-01T00:00:00Z
2023-12-30T01:31:38Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/58323
url http://hdl.handle.net/10451/58323
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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