This dataset originates from a standardized benthic surveys conducted between 2006 and 2008 at four coastal locations around the island of São Miguel, Azores (Northeast Atlantic), within the scope of Martins’ PhD studies (Martins 2009). The primary objective of the sampling campaigns was to quantify the abundance and spatial variability of intertidal populations of the patellid limpet Patella candei in two marine protected areas and two non-protected areas around the island. Using consistent field methodologies, the survey generated a robust baseline of limpet density data, enabling comparisons among sites, islands and supporting assessments of level of exploitation at local and regional scales. The dataset provides reference information relevant for ecological assessment and long-term monitoring, including the evaluation of the impact of limpet harvesting over time.
","language":"eng","citation":{"text":"Faria J, Martins G (2026). Rocky intertidal limpet (Patella candei) populations in the Azores: a quadrat-based comparison between partial and full protection regimes (2006-2008). Version 1.5. Universidade dos Açores. Samplingevent dataset. https://ipt.gbif.pt/ipt/resource?r=gusmpa&v=1.5 https://doi.org/10.15468/m2qvj8 accessed via GBIF.org on 2026-10-12.","citationProvidedBySource":true},"contactsCitation":[],"lockedForAutoUpdate":false,"createdBy":"0a80feca-b411-428a-a34e-c5c2fa07cdba","modifiedBy":"crawler.gbif.org","created":"2026-06-17T13:20:09.843+00:00","modified":"2026-09-24T12:59:23.511+00:00","contacts":[{"key":7604987,"type":"ORIGINATOR","primary":true,"userId":[],"firstName":"João","lastName":"Faria","position":[],"email":["joao.fo.santos@uac.pt"],"phone":[],"homepage":[],"organization":"Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO-Açores)","address":["Rua Mãe de Deus"],"city":"Ponta Delgada","country":"PT","postalCode":"9501-801","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-09-24T12:59:23.475+00:00","modified":"2026-09-24T12:59:23.475+00:00"},{"key":7604988,"type":"ORIGINATOR","primary":false,"userId":[],"firstName":"Gustavo","lastName":"Martins","position":[],"email":["gustavo.om.martins@uac.pt"],"phone":[],"homepage":[],"organization":"Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO-Açores)","address":["Rua Mãe de Deus"],"city":"Ponta Delgada","country":"PT","postalCode":"9501-801","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-09-24T12:59:23.479+00:00","modified":"2026-09-24T12:59:23.479+00:00"},{"key":7604989,"type":"METADATA_AUTHOR","primary":true,"userId":[],"firstName":"Gustavo","lastName":"Martins","position":[],"email":["gustavo.om.martins@uac.pt"],"phone":[],"homepage":[],"organization":"Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO-Açores)","address":["Rua Mãe de Deus"],"city":"Ponta Delgada","country":"PT","postalCode":"9501-801","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-09-24T12:59:23.481+00:00","modified":"2026-09-24T12:59:23.481+00:00"},{"key":7604990,"type":"METADATA_AUTHOR","primary":false,"userId":[],"firstName":"João","lastName":"Faria","position":[],"email":["joao.fo.santos@uac.pt"],"phone":[],"homepage":[],"organization":"Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO-Açores)","address":["Rua Mãe de Deus"],"city":"Ponta Delgada","country":"PT","postalCode":"9501-801","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-09-24T12:59:23.483+00:00","modified":"2026-09-24T12:59:23.483+00:00"},{"key":7604991,"type":"ADMINISTRATIVE_POINT_OF_CONTACT","primary":true,"userId":[],"firstName":"Gustavo","lastName":"Martins","position":[],"email":["gustavo.om.martins@uac.pt"],"phone":[],"homepage":[],"organization":"Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO-Açores)","address":["Rua Mãe de Deus"],"city":"Ponta Delgada","country":"PT","postalCode":"9501-801","createdBy":"crawler.gbif.org","modifiedBy":"crawler.gbif.org","created":"2026-09-24T12:59:23.484+00:00","modified":"2026-09-24T12:59:23.484+00:00"}],"endpoints":[{"key":1323173,"type":"DWC_ARCHIVE","url":"https://ipt.gbif.pt/ipt/archive.do?r=gusmpa","createdBy":"0a80feca-b411-428a-a34e-c5c2fa07cdba","modifiedBy":"0a80feca-b411-428a-a34e-c5c2fa07cdba","created":"2026-09-24T12:58:22.701+00:00","modified":"2026-09-24T12:58:22.701+00:00","machineTags":[]},{"key":1323172,"type":"EML","url":"https://ipt.gbif.pt/ipt/eml.do?r=gusmpa","createdBy":"0a80feca-b411-428a-a34e-c5c2fa07cdba","modifiedBy":"0a80feca-b411-428a-a34e-c5c2fa07cdba","created":"2026-09-24T12:58:22.619+00:00","modified":"2026-09-24T12:58:22.619+00:00","machineTags":[]}],"machineTags":[{"key":33138934,"namespace":"crawler.gbif.org","name":"crawl_attempt","value":"15","createdBy":"crawler.gbif.org","created":"2026-10-08T19:10:05.939+00:00"}],"tags":[],"identifiers":[{"key":488739,"type":"UUID","identifier":"8a26c6dc-d210-4021-a9c4-757eba03b3d4","createdBy":"crawler.gbif.org","created":"2026-09-23T15:32:33.487+00:00","primary":false},{"key":469330,"type":"URL","identifier":"https://ipt.gbif.pt/ipt/resource?r=gusmpa","createdBy":"crawler.gbif.org","created":"2026-06-18T07:03:26.422+00:00","primary":false}],"comments":[],"bibliographicCitations":[],"curatorialUnits":[],"taxonomicCoverages":[{"description":"limpets","coverages":[{"scientificName":"Mollusca","rank":{"verbatim":"phylum","interpreted":"PHYLUM"}},{"scientificName":"Patellida","rank":{"verbatim":"order","interpreted":"ORDER"}},{"scientificName":"Gastropoda","rank":{"verbatim":"class","interpreted":"CLASS"}},{"scientificName":"Animalia","rank":{"verbatim":"kingdom","interpreted":"KINGDOM"}},{"scientificName":"Patellidae","rank":{"verbatim":"family","interpreted":"FAMILY"}}]}],"geographicCoverages":[{"description":"This study was conducted on four locations in São Miguel Island, Azores Archipelago (Portugal), located in the Eastern Group of the archipelago. Sampling was carried out at multiple coastal sites distributed around the island, targeting representative rocky intertidal habitats.","boundingBox":{"minLatitude":37.7075,"maxLatitude":37.835458,"minLongitude":-25.625421,"maxLongitude":-25.392053,"globalCoverage":false}}],"temporalCoverages":[{"@type":"range","start":"2006-05-01T00:00:00.000+00:00","end":"2008-09-30T00:00:00.000+00:00"}],"keywordCollections":[{"thesaurus":"NA","keywords":["Macaronesia","Marine","Limpet","Benthos","Azores"]},{"thesaurus":"GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml","keywords":["Samplingevent"]}],"project":{"title":"Rocky intertidal limpet (Patella candei) populations in the Azores: a quadrat-based comparison between partial and full protection regimes (2006-2008)","contacts":[{"type":"ADMINISTRATIVE_POINT_OF_CONTACT","primary":false,"userId":[],"firstName":"Gustavo","lastName":"Martins","position":[],"email":[],"phone":[],"homepage":[],"address":[]}],"funding":"This work was supported by Postgraduate Grant SFRH/BD/22009/2005 awarded to G.M.M. by Fundação para a Ciência e Tecnologia (FCT). S.R.J. and S.J.H. were supported by NERC grants to the Marine Biological Association of the UK.","awards":[],"studyAreaDescription":"The Azores archipelago is located in the North Atlantic Ocean, approximately 1,600 km west of mainland Europe. It comprises nine main islands and several islets of volcanic origin, with a rugged morphology. The coastline is highly indented and shaped by volcanic processes, featuring lava flows, cliffs and extensive rocky shores. Coastal environments are predominantly rocky and provide wide areas of shallow subtidal habitat. In these shallow subtidal zones, benthic habitats are heterogeneous and mainly composed of volcanic substrates, including basaltic bedrock, boulder fields and interspersed sandy patches. This substrate heterogeneity generates a diversity of microhabitats that support rich benthic communities.","designDescription":"The dataset comprises data derived from intertidal surveys conducted at total of 4 locations around the island of São Miguel, Azore. Two locations were inside marine protected areas, and two locations were outside marine protected areas. Sampling was done twice in three years: once in May and once in September. At each location, ten 25 × 25 cm quadrats (meters apart) were haphazardly placed at two sites (10’s of m apart) at mid shore levels. The number of limpets in each quadrat was visually counted.","relatedProjects":[],"abstract":"This dataset originates from a standardized benthic surveys conducted between 2006 and 2008 at four coastal locations around the island of São Miguel, Azores (Northeast Atlantic), within the scope of Martins’ PhD studies (Martins 2009). The primary objective of the sampling campaigns was to quantify the abundance and spatial variability of intertidal populations of the patellid limpet Patella candei in two marine protected areas and two non-protected areas around the island. Using consistent field methodologies, the survey generated a robust baseline of limpet density data, enabling comparisons among sites, islands and supporting assessments of level of exploitation at local and regional scales. The dataset provides reference information relevant for ecological assessment and long-term monitoring, including the evaluation of the impact of limpet harvesting over time."},"samplingDescription":{"studyExtent":"The study encompasses four coastal locations (two protected vs two unprotected) around São Miguel island, Azores archipelago, situated in the Northeast Atlantic Ocean. Surveys were conducted exclusively in rocky intertidal habitats at mid shore heights, in wave-exposed, gentle sloping and well-drained basaltic bedrock areas. These habitats are representative of the predominant coastal environments of the island.","sampling":"Sampling was carried out in 2006, 2007 and 2008 . At each sampling location, ten 25 × 25 cm quadrats were haphazardly deployed on each of two sites. Individuals of Patella candei were visually recorded in situ, allowing rapid, repeatable, and non-destructive assessment of population density.","qualityControl":"Field surveys were conducted by trained benthic ecologist. Care was taken to place quadrats on representative, well-drained and undisturbed substrates without any obvious features (cracks, rock pools) to estimate animal abundances consistently across sites and shore heights.","methodSteps":["Fieldwork and Laboratory Procedures: Field work was conducted during May and September 2006-2008. On each of the 4 locations, 2 sites were selected comprising a 30 m stretch of the shore. Locations were selected at random but with the proviso that they had similar environmental conditions (e.g. slope, exposure to wave action). Two locations were within marine protected areas, two locations were outside marine protected areas. At each site, limpets were counted within 10 replicate 25 × 25 cm2 quadrats, and their abundance was expressed as the number of individuals per quadrat.","Data Preparation and Standardization\nField observations were compiled into a structured dataset organized by year, season, level or protection, location, site and replicate. The resulting dataset provides a consistent baseline for spatial comparisons and long-term monitoring of rocky intertial populations of Patella candei in the Azores."]},"countryCoverage":[],"collections":[],"dataDescriptions":[],"dataLanguage":"eng","acknowledgements":"This work was supported by Postgraduate Grant SFRH/BD/22009/2005 awarded to G.M.M. by Fundação para a Ciência e Tecnologia (FCT). S.R.J. and S.J.H. were supported by NERC grants to the Marine Biological Association of the UK. Funding to put data open access in AZORES BIOPORTAL was obtained from the project “Upgrading the Azorean Biodiversity Portal Infrastructure (AZORES BIOPORTAL- PORBIOTA) to Boost Biodiversity Research, Management, and Education -PORBIOTA” (DRCID, ACORES2030-FEDER-03420600). Data transformation and publication was funded by the European Union under the Horizon Europe Programme with Grant Agreement No. 101112823 (DTO-BioFlow) through an FSTP call.
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