Patterns of social ecology of Risso's dolphins (Grampus griseus) off Pico Island, Azores

Hartman, Karin Louise

Publication

Patterns of social ecology of Risso's dolphins (Grampus griseus) off Pico Island, Azores

2015-06-01Doctoral thesis

datacite.subject.fos	Ciências Naturais::Ciências Biológicas	pt_PT
dc.contributor.advisor	Azevedo, José Manuel Viegas de Oliveira Neto
dc.contributor.advisor	Hoelzel, A. Rus
dc.contributor.author	Hartman, Karin Louise
dc.date.accessioned	2017-04-07T15:27:27Z
dc.date.available	2017-04-07T15:27:27Z
dc.date.issued	2015-06-01
dc.description	Tese de Doutoramento, Biologia, 1 de junho de 2015, Universidade dos Açores.	pt_PT
dc.description.abstract	This PhD thesis is focusing on the ecology of a medium sized and poorly studied oceanic dolphin species: The Risso’s dolphin (Grampus griseus). […]. In this study, we present for the first time a model for the social structure of Risso’s dolphin (Grampus griseus Cuvier 1812). Over the period 2004-2006, 1028 Risso’s dolphins were identified at Pico Island, Azores. Individuals sighted on 10 or more occasions were included in analysis of social structure (n = 183). High resighting rates indicate strong site-fidelity of at least part of the population. We found that individuals form stable long-term bonds, organised in pairs, or in clusters of 3-12 individuals. Social structure is stratified based on age and sex classes, with strong associations between adult males and adult females. We suggest that clusters form the basic units of Risso’s dolphin society. Thirteen pods consisting solely of adults, likely males, and 3 pods consisting of mother-calf pairs were identified. Males are organised in stable, long-term associations of varying size that occur throughout the complete range of behavioural states observed. For females, associations can be of similar strength, but the time-scale may vary depending on the presence of nursing calves. As subadults, associations also occur (pair-formation), but are less stable than those observed for adults. We propose a new model for Risso’s dolphin societies known as a stratified social organisation, which differs from the fission-fusion and matrilineal society models. […].	en
dc.description.sponsorship	This research was fundamentally supported by the Nova Atlantis Foundation and a Ph.D. grant from Fundo Regional para a Ciência (FRC ref. M3.1.2/F/014/2009). Additional funds and logistic support were provided by CIRN and the European Regional Development Fund (ERDF) through the COMPETE - Operational Competitiveness Programme and national funds through FCT – Foundation for Science and Technology, under the project "PEst-C/MAR/LA0015/2013".	pt_PT
dc.identifier.citation	Hartman, Karin Louise. "Patterns of social ecology of Risso's dolphins (Grampus griseus) off Pico Island, Azores". 2015. 171 p.. (Tese de Doutoramento em Biologia). Ponta Delgada: Universidade dos Açores, 2014. [Consult. Dia Mês Ano]. Disponível em www:<http://hdl.handle.net/10400.3/4074>.	pt_PT
dc.identifier.tid	101545576	pt_PT
dc.identifier.uri	http://hdl.handle.net/10400.3/4074
dc.language.iso	eng	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	Biologia Marinha	pt_PT
dc.subject	Ecologia Marinha	pt_PT
dc.subject	Golfinho de Risso	pt_PT
dc.subject	Ecologia Social (Animal)	pt_PT
dc.subject	Ilha do Pico	pt_PT
dc.subject	Açores	pt_PT
dc.subject	(Grampus griseus)	pt_PT
dc.subject	Dolphin Society	en
dc.subject	Risso's Dolphin	en
dc.title	Patterns of social ecology of Risso's dolphins (Grampus griseus) off Pico Island, Azores	en
dc.type	doctoral thesis
dspace.entity.type	Publication
oaire.awardURI	info:eu-repo/grantAgreement/FCT/COMPETE/PEst-C%2FMAR%2FLA0015%2F2013/PT
oaire.fundingStream	COMPETE
project.funder.identifier	http://doi.org/10.13039/501100001871
project.funder.name	Fundação para a Ciência e a Tecnologia
rcaap.rights	restrictedAccess	pt_PT
rcaap.type	doctoralThesis	pt_PT
relation.isProjectOfPublication	f93f3e48-9db9-4f44-adb4-49298e7dc9b5
relation.isProjectOfPublication.latestForDiscovery	f93f3e48-9db9-4f44-adb4-49298e7dc9b5
thesis.degree.name	Tese de Doutoramento em Biologia	pt_PT