2024-03-29T13:23:19Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1584132022-03-24T15:38:35Zcom_10261_132com_10261_8com_10261_88col_10261_385col_10261_341
DIGITAL.CSIC
author
Genovart, Meritxell
author
Bécares, Juan
author
Igual, José Manuel
author
Martínez-Abraín, Alejandro
author
Escandell, R.
author
Sánchez, A.
author
Rodríguez, Beneharo
author
Arcos, José Manuel
author
Oro, Daniel
funder
Ministerio de Economía y Competitividad (España)
funder
European Commission
2017-12-20T12:32:19Z
2017-12-20T12:32:19Z
2018-03
Global Change Biology 24(3): 1279-1290 (2018)
1466-822X
http://hdl.handle.net/10261/158413
10.1111/gcb.13997
1466-8238
http://dx.doi.org/10.13039/501100003329http://dx.doi.org/10.13039/501100000780
Marine megafauna, including seabirds, are critically affected by fisheries bycatch. However, bycatch risk may differ on temporal and spatial scales due to the uneven distribution and effort of fleets operating different fishing gear, and to focal species distribution and foraging behaviour. Scopoli's shearwater Calonectris diomedea is a long-lived seabird that experiences high bycatch rates in longline fisheries and strong population-level impacts due to this type of anthropogenic mortality. Analyzing a long-term data set on individual monitoring, we compared adult survival (by means of multi-event capture-recapture models) among three close predator-free Mediterranean colonies of the species. Unexpectedly for a long-lived organism, adult survival varied among colonies. We explored potential causes of this differential survival, by: (1) measuring egg volume as a proxy of food availability and parental condition; (2) building a specific longline bycatch risk map for the species; and (3) assessing the distribution patterns of breeding birds from the three study colonies via GPS tracking. Egg volume was very similar between colonies over time, suggesting that environmental variability related to habitat foraging suitability was not the main cause of differential survival. On the other hand, differences in foraging movements among individuals from the three colonies expose them to differential mortality risk, which likely influenced the observed differences in adult survival. The overlap of information obtained by the generation of specific bycatch risk maps, the quantification of population demographic parameters and the foraging spatial analysis should inform managers about differential sensitivity to the anthropogenic impact at mesoscale level and guide decisions depending on the spatial configuration of local populations. The approach would apply and should be considered in any species where foraging distribution is colony-specific and mortality risk varies spatially.
eng
openAccess
Demography
Fisheries bycatch
Capture-recapture
Calonectris diomedea
Mediterranean
Climatic indexes
Remote tracking
Risk map
Adult survival
Differential adult survival at close seabird colonies: the importance of spatial foraging segregation and bycatch risk during the breeding season
artículo
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URL
https://digital.csic.es/bitstream/10261/158413/3/adult_survival.pdf
File
MD5
c7ee15a91744ec88b732b1b5e1789681
475494
application/pdf
adult_survival.pdf