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2. Distribution and breeding numbers of a recently split species, the West African Crested Tern Thalasseus albididorsalis

Author

Folmer, Eelke, Mullié, Wim C, Veen, Thor, Manga, Effoleming, Manneh, Lamin, Samb, Moussa, Monteira, Hamilton, Mansali, Valentin, Gomis, Nicolas, Veen, Jan, Diouf, Abdou, Diop, Moussa Sega, Diawara, Yelli, Dallmeijer, Hanneke, Camara, Mohamed, el Agbani, Mohamed Aziz, and Amarejeyat, Ahmed

Subjects
Breeding habitat, conservation threats, population estimate, seabird monitoring, Thalasseus maximus albididorsalis, Ecology, Evolution, Behavior and Systematics
Abstract

This study investigated the distribution, numbers and conservation threats of the West African Crested Tern, which was recently elevated to full species after it was split from the Royal Tern with an American and African subspecies. In the period 1998–2019, a total of 13 West African coastal islands were identified as breeding localities, stretching from Mauritania to Guinea. All the islands are isolated, usually sandy and subject to erosion. There was great yearly variation in the numbers of breeding pairs within and between sites. A complete census of all breeding locations in 2015 and 2019 resulted in estimates of 79 000 and 77 000 pairs, respectively. The threats identified are predation, human disturbance, nest flooding and loss of breeding habitat as a result of coastal erosion. Predation of eggs and chicks by Sacred Ibises and especially Great White Pelicans may heavily impact on the species’ breeding output. Human disturbance is slight because most of the breeding islands are within protected areas. Flooding of nests has increasingly been observed in recent years, occurring at nine of 11 islands occupied by the terns in 2015. Most islands are subject to erosion, which has resulted in substantial loss of suitable breeding habitat over the 22-year study period. Two important islands have become completely unsuitable. We conclude that West African Crested Terns have an uncertain future. Food shortage resulting from industrial fishing is suspected, and the effects of climate change might negatively impact on habitat suitability and food availability. Monitoring of the total population at three-year intervals is recommended.

Published
2022
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4. Distribution and breeding numbers of a recently split species, the West African Crested Tern Thalasseus albididorsalis

Author

Veen, Jan, primary, Amarejeyat, Ahmed, additional, el Agbani, Mohamed Aziz, additional, Camara, Mohamed, additional, Dallmeijer, Hanneke, additional, Diawara, Yelli, additional, Diop, Moussa Sega, additional, Diouf, Abdou, additional, Folmer, Eelke, additional, Gomis, Nicolas, additional, Mansali, Valentin, additional, Monteira, Hamilton, additional, Samb, Moussa, additional, Manneh, Lamin, additional, Manga, Effoleming, additional, Veen, Thor, additional, and Mullié, Wim C, additional

Published
2022
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6. Spatial scales of marine conservation management for breeding seabirds

Author

Oppel, Steffen, Bolton, Mark, Carneiro, Ana P. B., Dias, Maria P., Green, Jonathan A., Masello, Juan F., Phillips, Richard A., Owen, Ellie, Quillfeldt, Petra, Beard, Annalea, Bertrand, Sophie, Blackburn, Jez, Boersma, P. Dee, Borges, Alder, Broderick, Annette C., Catry, Paulo, Cleasby, Ian, Clingham, Elizabeth, Creuwels, Jeroen, Crofts, Sarah, Cuthbert, Richard J., Dallmeijer, Hanneke, Davies, Delia, Davies, Rachel, Dilley, Ben J., Dinis, Herculano Andrade, Dossa, Justine, Dunn, Michael J., Efe, Marcio A., Fayet, Annette L., Figueiredo, Leila, Frederico, Adelcides Pereira, Gjerdrum, Carina, Godley, Brendan J., Granadeiro, Jose Pedro, Guilford, Tim, Hamer, Keith C., Hazin, Carolina, Hedd, April, Henry, Leeann, Hernandez-montero, Marcos, Hinke, Jefferson, Kokubun, Nobuo, Leat, Eliza, Tranquilla, Laura Mcfarlane, Metzger, Benjamin, Militao, Teresa, Montrond, Gilson, Mullie, Wim, Padget, Oliver, Pearmain, Elizabeth J., Pollet, Ingrid L., Putz, Klemens, Quintana, Flavio, Ratcliffe, Norman, Ronconi, Robert A., Ryan, Peter G., Saldanha, Sarah, Shoji, Akiko, Sim, Jolene, Small, Cleo, Soanes, Louise, Takahashi, Akinori, Trathan, Phil, Trivelpiece, Wayne, Veen, Jan, Wakefield, Ewan, Weber, Nicola, Weber, Sam, Zango, Laura, Daunt, Francis, Ito, Motohiro, Harris, Michael P., Newell, Mark A., Wanless, Sarah, Gonzalez-solis, Jacob, Croxall, John, Oppel, Steffen, Bolton, Mark, Carneiro, Ana P. B., Dias, Maria P., Green, Jonathan A., Masello, Juan F., Phillips, Richard A., Owen, Ellie, Quillfeldt, Petra, Beard, Annalea, Bertrand, Sophie, Blackburn, Jez, Boersma, P. Dee, Borges, Alder, Broderick, Annette C., Catry, Paulo, Cleasby, Ian, Clingham, Elizabeth, Creuwels, Jeroen, Crofts, Sarah, Cuthbert, Richard J., Dallmeijer, Hanneke, Davies, Delia, Davies, Rachel, Dilley, Ben J., Dinis, Herculano Andrade, Dossa, Justine, Dunn, Michael J., Efe, Marcio A., Fayet, Annette L., Figueiredo, Leila, Frederico, Adelcides Pereira, Gjerdrum, Carina, Godley, Brendan J., Granadeiro, Jose Pedro, Guilford, Tim, Hamer, Keith C., Hazin, Carolina, Hedd, April, Henry, Leeann, Hernandez-montero, Marcos, Hinke, Jefferson, Kokubun, Nobuo, Leat, Eliza, Tranquilla, Laura Mcfarlane, Metzger, Benjamin, Militao, Teresa, Montrond, Gilson, Mullie, Wim, Padget, Oliver, Pearmain, Elizabeth J., Pollet, Ingrid L., Putz, Klemens, Quintana, Flavio, Ratcliffe, Norman, Ronconi, Robert A., Ryan, Peter G., Saldanha, Sarah, Shoji, Akiko, Sim, Jolene, Small, Cleo, Soanes, Louise, Takahashi, Akinori, Trathan, Phil, Trivelpiece, Wayne, Veen, Jan, Wakefield, Ewan, Weber, Nicola, Weber, Sam, Zango, Laura, Daunt, Francis, Ito, Motohiro, Harris, Michael P., Newell, Mark A., Wanless, Sarah, Gonzalez-solis, Jacob, and Croxall, John

Abstract

Knowing the spatial scales at which effective management can be implemented is fundamental for conservation planning. This is especially important for mobile species, which can be exposed to threats across large areas, but the space use requirements of different species can vary to an extent that might render some management approaches inefficient. Here the space use patterns of seabirds were examined to provide guidance on whether conservation management approaches should be tailored for taxonomic groups with different movement characteristics. Seabird tracking data were synthesised from 5419 adult breeding individuals of 52 species in ten families that were collected in the Atlantic Ocean basin between 1998 and 2017. Two key aspects of spatial distribution were quantified, namely how far seabirds ranged from their colony, and to what extent individuals from the same colony used the same areas at sea. There was evidence for substantial differences in patterns of space-use among the ten studied seabird families, indicating that several alternative conservation management approaches are needed. Several species exhibited large foraging ranges and little aggregation at sea, indicating that area-based conservation solutions would have to be extremely large to adequately protect such species. The results highlight that short-ranging and aggregating species such as cormorants, auks, some penguins, and gulls would benefit from conservation approaches at relatively small spatial scales during their breeding season. However, improved regulation of fisheries, bycatch, pollution and other threats over large spatial scales will be needed for wide-ranging and dispersed species such as albatrosses, petrels, storm petrels and frigatebirds.

Published
2018
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7. Spatial scales of marine conservation management for breeding seabirds

Author

Oppel, Steffen, primary, Bolton, Mark, additional, Carneiro, Ana P.B., additional, Dias, Maria P., additional, Green, Jonathan A., additional, Masello, Juan F., additional, Phillips, Richard A., additional, Owen, Ellie, additional, Quillfeldt, Petra, additional, Beard, Annalea, additional, Bertrand, Sophie, additional, Blackburn, Jez, additional, Boersma, P. Dee, additional, Borges, Alder, additional, Broderick, Annette C., additional, Catry, Paulo, additional, Cleasby, Ian, additional, Clingham, Elizabeth, additional, Creuwels, Jeroen, additional, Crofts, Sarah, additional, Cuthbert, Richard J., additional, Dallmeijer, Hanneke, additional, Davies, Delia, additional, Davies, Rachel, additional, Dilley, Ben J., additional, Dinis, Herculano Andrade, additional, Dossa, Justine, additional, Dunn, Michael J., additional, Efe, Marcio A., additional, Fayet, Annette L., additional, Figueiredo, Leila, additional, Frederico, Adelcides Pereira, additional, Gjerdrum, Carina, additional, Godley, Brendan J., additional, Granadeiro, José Pedro, additional, Guilford, Tim, additional, Hamer, Keith C., additional, Hazin, Carolina, additional, Hedd, April, additional, Henry, Leeann, additional, Hernández-Montero, Marcos, additional, Hinke, Jefferson, additional, Kokubun, Nobuo, additional, Leat, Eliza, additional, Tranquilla, Laura McFarlane, additional, Metzger, Benjamin, additional, Militão, Teresa, additional, Montrond, Gilson, additional, Mullié, Wim, additional, Padget, Oliver, additional, Pearmain, Elizabeth J., additional, Pollet, Ingrid L., additional, Pütz, Klemens, additional, Quintana, Flavio, additional, Ratcliffe, Norman, additional, Ronconi, Robert A., additional, Ryan, Peter G., additional, Saldanha, Sarah, additional, Shoji, Akiko, additional, Sim, Jolene, additional, Small, Cleo, additional, Soanes, Louise, additional, Takahashi, Akinori, additional, Trathan, Phil, additional, Trivelpiece, Wayne, additional, Veen, Jan, additional, Wakefield, Ewan, additional, Weber, Nicola, additional, Weber, Sam, additional, Zango, Laura, additional, Daunt, Francis, additional, Ito, Motohiro, additional, Harris, Michael P., additional, Newell, Mark A., additional, Wanless, Sarah, additional, González-Solís, Jacob, additional, and Croxall, John, additional

Published
2018
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