Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys
AUTHOR CONTRIBUTIONS - Study conception HA and CE; Investigation HA, PCR, jBS, MF, ATP, JMC, JV and CE; Methodology HA, PCR, JBS, JV and CE; Resources HA, JBS, JV and CE; Data curation HA, PCR, JBS, JV; Writing initial draft HA; Writing critical review and commentary of revision HA, PCR, jBS, MF, AT...
Published in: | Ardeola |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
SEO
2022
|
Subjects: | |
Online Access: | http://hdl.handle.net/10400.22/22253 https://doi.org/10.13157/arla.69.2.2022.ra1 |
id |
ftinstpporto:oai:recipp.ipp.pt:10400.22/22253 |
---|---|
record_format |
openpolar |
spelling |
ftinstpporto:oai:recipp.ipp.pt:10400.22/22253 2023-05-15T17:36:31+02:00 Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys Araújo, Hélder Rodrigues, Pedro Bastos-Santos, Jorge Ferreira, Marisa Pereira, Andreia Martínez-Cedeira, José Vingada, José Eira, Catarina 2022 http://hdl.handle.net/10400.22/22253 https://doi.org/10.13157/arla.69.2.2022.ra1 eng eng SEO This work was partly funded by the Portuguese Wildlife Society and projects SafeSea EEA-Grants, FAME (Proj. 2009-1/089) and European Commission’s life Programme (MarPro NAt/Pt/00038). this study was also partly supported by the Portuguese Foundation for Science and technology (FCt) with Grants SFRh/BD/30240/2006 to M. Ferreira, SFRh/BD/122890/2016 to A.t. Pereira and SFRh/ BD/32841/2006 to P.C. Rodrigues. thanks are due to the Foundation of Science and technology/Ministério da Ciência tecnologia e Ensino Superior (FCt/MCtES) for financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020+lA/P/ 0094/202) and to C.E., funded by FCT and by ERDF (COMPEtE2020). http://hdl.handle.net/10400.22/22253 doi:10.13157/arla.69.2.2022.ra1 openAccess Distance Sampling Maxent Morus bassanus article 2022 ftinstpporto https://doi.org/10.13157/arla.69.2.2022.ra1 2023-03-12T18:58:58Z AUTHOR CONTRIBUTIONS - Study conception HA and CE; Investigation HA, PCR, jBS, MF, ATP, JMC, JV and CE; Methodology HA, PCR, JBS, JV and CE; Resources HA, JBS, JV and CE; Data curation HA, PCR, JBS, JV; Writing initial draft HA; Writing critical review and commentary of revision HA, PCR, jBS, MF, ATP, JMC and CE; Supervision PCR, JV and CE; Project Administration JV and CE. Several North Atlantic breeding seabirds, such as the Northern Gannet Morus bassanus, use Western Iberian Waters for wintering and migration. In this study, we aimed at producing absolute population estimates of post-breeding Gannets and evaluating the importance of the study area within the species’ migration range. We performed six aerial surveys in September and/or October each year between 2010 and 2015, covering 74,840km2 in total. Using line transect methodology, 3,672 Gannet sightings were recorded along 10,496.3 nautical miles (nm). Immature individuals and adults comprised approximately 87% of all sightings. Using Distance sampling, overall abundance was estimated at 89,930 birds, ranging from 58,010 individuals in 2014 to 128,140 in 2015. the highest densities per sector areas were recorded in the North and Centre sectors whereas the lowest densities were registered in the Galicia sector, the Spanish region within the study area. Gannets were mostly present in shallow shelf waters of the continental shelf, particularly between 3 and 20 nautical miles offshore. Habitat suitability models for Gannets in the study area were tested using several eco-geographical variables and chlorophyll concentrations were found to contribute most to explaining annual Gannet occurrence probabilities. A global interannual spatial analysis demonstrated the core areas for conservation of the Northern Gannet in Western Iberian Waters. Moreover, our results demonstrate that Western Iberian waters are used by almost 10% of the global Northern Gannet population, corroborating the existence of seabird hotspots during the non-breeding period, along migration ... Article in Journal/Newspaper North Atlantic Instituto Politécnico do Porto: Repositório Científico (RECIPP) Ardeola 69 2 |
institution |
Open Polar |
collection |
Instituto Politécnico do Porto: Repositório Científico (RECIPP) |
op_collection_id |
ftinstpporto |
language |
English |
topic |
Distance Sampling Maxent Morus bassanus |
spellingShingle |
Distance Sampling Maxent Morus bassanus Araújo, Hélder Rodrigues, Pedro Bastos-Santos, Jorge Ferreira, Marisa Pereira, Andreia Martínez-Cedeira, José Vingada, José Eira, Catarina Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys |
topic_facet |
Distance Sampling Maxent Morus bassanus |
description |
AUTHOR CONTRIBUTIONS - Study conception HA and CE; Investigation HA, PCR, jBS, MF, ATP, JMC, JV and CE; Methodology HA, PCR, JBS, JV and CE; Resources HA, JBS, JV and CE; Data curation HA, PCR, JBS, JV; Writing initial draft HA; Writing critical review and commentary of revision HA, PCR, jBS, MF, ATP, JMC and CE; Supervision PCR, JV and CE; Project Administration JV and CE. Several North Atlantic breeding seabirds, such as the Northern Gannet Morus bassanus, use Western Iberian Waters for wintering and migration. In this study, we aimed at producing absolute population estimates of post-breeding Gannets and evaluating the importance of the study area within the species’ migration range. We performed six aerial surveys in September and/or October each year between 2010 and 2015, covering 74,840km2 in total. Using line transect methodology, 3,672 Gannet sightings were recorded along 10,496.3 nautical miles (nm). Immature individuals and adults comprised approximately 87% of all sightings. Using Distance sampling, overall abundance was estimated at 89,930 birds, ranging from 58,010 individuals in 2014 to 128,140 in 2015. the highest densities per sector areas were recorded in the North and Centre sectors whereas the lowest densities were registered in the Galicia sector, the Spanish region within the study area. Gannets were mostly present in shallow shelf waters of the continental shelf, particularly between 3 and 20 nautical miles offshore. Habitat suitability models for Gannets in the study area were tested using several eco-geographical variables and chlorophyll concentrations were found to contribute most to explaining annual Gannet occurrence probabilities. A global interannual spatial analysis demonstrated the core areas for conservation of the Northern Gannet in Western Iberian Waters. Moreover, our results demonstrate that Western Iberian waters are used by almost 10% of the global Northern Gannet population, corroborating the existence of seabird hotspots during the non-breeding period, along migration ... |
format |
Article in Journal/Newspaper |
author |
Araújo, Hélder Rodrigues, Pedro Bastos-Santos, Jorge Ferreira, Marisa Pereira, Andreia Martínez-Cedeira, José Vingada, José Eira, Catarina |
author_facet |
Araújo, Hélder Rodrigues, Pedro Bastos-Santos, Jorge Ferreira, Marisa Pereira, Andreia Martínez-Cedeira, José Vingada, José Eira, Catarina |
author_sort |
Araújo, Hélder |
title |
Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys |
title_short |
Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys |
title_full |
Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys |
title_fullStr |
Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys |
title_full_unstemmed |
Monitoring Abundance and Distribution of Northern Gannets Morus bassanus in Western Iberian Waters in Autumn by Aerial Surveys |
title_sort |
monitoring abundance and distribution of northern gannets morus bassanus in western iberian waters in autumn by aerial surveys |
publisher |
SEO |
publishDate |
2022 |
url |
http://hdl.handle.net/10400.22/22253 https://doi.org/10.13157/arla.69.2.2022.ra1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
This work was partly funded by the Portuguese Wildlife Society and projects SafeSea EEA-Grants, FAME (Proj. 2009-1/089) and European Commission’s life Programme (MarPro NAt/Pt/00038). this study was also partly supported by the Portuguese Foundation for Science and technology (FCt) with Grants SFRh/BD/30240/2006 to M. Ferreira, SFRh/BD/122890/2016 to A.t. Pereira and SFRh/ BD/32841/2006 to P.C. Rodrigues. thanks are due to the Foundation of Science and technology/Ministério da Ciência tecnologia e Ensino Superior (FCt/MCtES) for financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020+lA/P/ 0094/202) and to C.E., funded by FCT and by ERDF (COMPEtE2020). http://hdl.handle.net/10400.22/22253 doi:10.13157/arla.69.2.2022.ra1 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.13157/arla.69.2.2022.ra1 |
container_title |
Ardeola |
container_volume |
69 |
container_issue |
2 |
_version_ |
1766136024343248896 |