Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey

Detalhes bibliográficos
Autor(a) principal: Cyrne, Ricardo Sousa
Data de Publicação: 2015
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.1/7878
Resumo: Dissertação de mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015
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spelling Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year surveyBiologia marinhaMoluscosGastrópodesMigraçãoZonas intertidaisDomínio/Área Científica::Ciências Naturais::Ciências BiológicasDissertação de mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015Researchers' interest in nudibranch species has grown during the last decades mainly due to their potential in biotechnology and neurobiology. However, a low number of ecological studies have been undertaken on this mollusk group, especially using long-term scales. In certain intertidal and subtidal locations some species of nudibranchs suddenly appear in very large numbers and also suddenly disappear. These seasonal events are observed and explained by several theories, being the most accepted the migration theory – inshore movements to copulate and egg deposition. However, controversy still exists in whether nudibranchs migrate or not. The aim of the present thesis is to study the migration behavior towards the intertidal zone of two nudibranch species, Dendrodoris herytra and D. grandiflora in Sado estuary, Portugal. Here it is shown that Dendrodoris nudibranchs start to appear in the intertidal areas in March and completely disappear around July, reaching pick density between April and May. Possible connections between Dendrodoris migrations with environmental parameters such as salinity, water and air temperature and water turbidity were assessed. The latter environmental factor revealed the strongest association with nudibranchs’ presence in such intertidal areas; i.e. the peak in nudibranch density was consistently observed during the period of higher turbidity. Since most of the individuals were mature and ready to spawn when caught, one may argue that the increased turbidity (as a proxy of increased phytoplankton biomass) should directly enhance the survival rate of planktotrophic larvae. Other possible explanations may include food foraging, as well as predator avoidance. During this long therm survey of five years, the density of emmerged individuals was very consistent. The environmental factors gave clues on what triggers this seasonal events, and how they induce the periodic appearance during spring months. The fact that both species were observed emmerged during low tide increases even more the interest in them and their biology. Nevertheless the great contribution of this research to nudibranchs ecology, studies still need to be undertaken to fully understand the causes behind the occurrence of such episodic events.Teodósio, AlexandraRosa, RuiSapientiaCyrne, Ricardo Sousa2016-03-18T13:39:50Z2015-11-3020152015-11-30T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.1/7878TID:201192470enginfo: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:RCAAP2023-07-24T10:19:03Zoai:sapientia.ualg.pt:10400.1/7878Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:00:08.670311Repositório 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 Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
title Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
spellingShingle Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
Cyrne, Ricardo Sousa
Biologia marinha
Moluscos
Gastrópodes
Migração
Zonas intertidais
Domínio/Área Científica::Ciências Naturais::Ciências Biológicas
title_short Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
title_full Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
title_fullStr Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
title_full_unstemmed Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
title_sort Long-term seasonal changes in the abundance of Dendrodoris nudibranchs: a five-year survey
author Cyrne, Ricardo Sousa
author_facet Cyrne, Ricardo Sousa
author_role author
dc.contributor.none.fl_str_mv Teodósio, Alexandra
Rosa, Rui
Sapientia
dc.contributor.author.fl_str_mv Cyrne, Ricardo Sousa
dc.subject.por.fl_str_mv Biologia marinha
Moluscos
Gastrópodes
Migração
Zonas intertidais
Domínio/Área Científica::Ciências Naturais::Ciências Biológicas
topic Biologia marinha
Moluscos
Gastrópodes
Migração
Zonas intertidais
Domínio/Área Científica::Ciências Naturais::Ciências Biológicas
description Dissertação de mestrado, Biologia Marinha, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015
publishDate 2015
dc.date.none.fl_str_mv 2015-11-30
2015
2015-11-30T00:00:00Z
2016-03-18T13:39:50Z
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/10400.1/7878
TID:201192470
url http://hdl.handle.net/10400.1/7878
identifier_str_mv TID:201192470
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
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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
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