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The impact of touristic whale-watching on Delphinus Delphis and Tursiops truncatus in the Algarve Coast: combining acoustic analysis and land observations

2024-12Journal article Open access
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dc.contributor.authorForli, Maria Julia
dc.contributor.authorPeres dos Santos, Rui Pedro
dc.contributor.authorRodrigues, Alfredo
dc.contributor.authorCastilho, Rita
dc.date.accessioned2024-12-09T14:01:46Z
dc.date.available2024-12-09T14:01:46Z
dc.date.issued2024-12
dc.description.abstractTouristic whale watching (WW) is an important socioeconomic activity worldwide. Recently, short and longterm impacts caused by WW have been reported for several cetacean species, including Delphinus delphis and Tursiops truncatus, the two most observed species in Portugal. Most of the operations in mainland Portugal are concentrated on the South Coast (Algarve). However, despite their importance for the region, studies focused on the impact of this activity on the animals are still scarce. We used acoustic behaviour analysis and land-based observations to determine the alterations in the vocalization patterns of these animals caused by WW vessels and the length of exposure to this stressor. We found WW presence significantly altered five out of six acoustic parameters of whistles, whistle rate, and whistle type distribution for D. delphis, whereas T. truncatus exhibited significant changes in three acoustic parameters. Conversely, T. truncatus significantly reduced echolocation click rates, while D. delphis did not show significant changes. We also found that the Central region of this coast is the most affected, with animals exposed to WW vessels for up to 38.9% of daylight hours. Furthermore, 66.7% of the observation time in this area had several vessels that exceeded the limit established by law. These results suggest that our study species are impacted by WW, while D. delphis is more affected during social behaviours, and T. truncatus is more affected during foraging activities. Both behaviours are biologically significant, and their disturbance might, in the long term, lead to adverse effects at the population level by decreasing reproductive success and fitness. A gap in knowledge, inadequate legislation and compliance issues threaten the development of a sustainable WW industry in the Algarve and might endanger local populations, therefore immediate attention is needed.eng
dc.identifier.doi10.1016/j.ocecoaman.2024.107431
dc.identifier.issn0964-5691
dc.identifier.urihttp://hdl.handle.net/10400.1/26425
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationTemporal and spatial distribution of cetaceans in the Azores as a means to define migration and movement patterns and associated biotic and abiotic distributional driving factors.
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofOcean & Coastal Management
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectTursiops truncatus
dc.subjectDelphinus delphis
dc.subjectWhale watching
dc.subjectAcoustic behaviour
dc.subjectLand-based observation
dc.titleThe impact of touristic whale-watching on Delphinus Delphis and Tursiops truncatus in the Algarve Coast: combining acoustic analysis and land observationseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleTemporal and spatial distribution of cetaceans in the Azores as a means to define migration and movement patterns and associated biotic and abiotic distributional driving factors.
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//UI%2FBD%2F151306%2F2021/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.startPage107431
oaire.citation.titleOcean & Coastal Management
oaire.citation.volume259
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameForli
person.familyNamePeres dos Santos
person.familyNameCastilho
person.givenNameMaria Julia
person.givenNameRui Pedro
person.givenNameRita
person.identifier452212
person.identifier.ciencia-id2912-6AF4-751A
person.identifier.ciencia-id0513-0407-A6C1
person.identifier.orcid0009-0002-7564-4014
person.identifier.orcid0000-0003-0727-3688
person.identifier.ridB-6185-2008
person.identifier.scopus-author-id56271196600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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