INVESTIGADORES
MARIANO Y JELICICH Rocio
artículos
Título:
Environmental and operational variability affecting the mortality of Black-browed Albatrosses associated with long-liners in Argentina
Autor/es:
GÓMEZ LAICH, AGUSTINA; FAVERO, MARCO; MARIANO-JELICICH, ROCÍO; BLANCO, GABRIEL; CAÑETE, GUILLERMO; ARIAS, ALEJANDRO; SILVA RODRÍGUEZ, PATRICIA; BRACHETTA, HUGO
Revista:
Emu
Editorial:
CSIRO
Referencias:
Año: 2006 vol. 106 p. 21 - 28
ISSN:
0158-4197
Resumen:
The effects of different environmental and operational factors on the incidental capture of Black-browed
Albatross (Thalassarche melanophris) in long-line fishing operations were analysed. This is the most commonly
captured seabird by Argentine long-line fishing vessels, and significant decreases in its populations have been
mainly attributed to long-line fishing practices. The estimated mean rate ± s.d. of by-catch for the analysed period
(1999–2003) was 0.03 ± 0.39 birds per 1000 hooks. Black-browed Albatrosses were mainly caught during day
settings. Higher capture rates were observed during autumn and winter. The effect of the length of long-lines on the
incidental capture of Black-browed Albatrosses was also analysed, showing that higher capture rates occurred when
short long-lines were deployed. Seasonal differences in the distribution of captures were observed, being widely
distributed to the north of the shelf-break during autumn–winter (i.e. non-breeding season) and mostly concentrated
in southernmost latitudes, closer to the presumed breeding area in the Malvinas (Falkland) Islands during
spring–summer. Mortalities during winter were mainly associated with the Patagonian Toothfish (Dissostrichus
eleginoides) fishery, while those observed during summer were associated with long-liners targeting Kingklip
(Genypterus blacodes) on the Patagonian Shelf.