التفاصيل البيبلوغرافية
| العنوان: |
DEMOGRAPHICS OF LAYSAN PHOEBASTRIA IMMUTABIL1S AND BLACK-FOOTED P. NIGRIPES ALBTROSS CAUGHT AS BYCATCH IN ALASKAN GROUNDFISH AND HAWAIIAN LONGLINE FISHERIES. |
| المؤلفون: |
NEVINS, HANNAHROSE M., BECK, JESSIE, MICHAEL, PAMELA E., HESTER, MICHELLE, PESCHON, JOHN, DONNELLY-GREENAN, ERICA, FITZGERALD, SHANNON |
| المصدر: |
Marine Ornithology; Oct2018, Vol. 46 Issue 2, p187-196, 10p |
| مصطلحات موضوعية: |
LAYSAN albatross, FISHERY management, MARINE ecology, ALBATROSSES, ENDANGERED species |
| Abstract (English): |
In fisheries, incidental bycatch of non-target species, including seabirds, is the result of complex interactions between species and fishing effort. While understanding the magnitude of bycatch is essential to understanding its impact on incidentally caught species, a full characterization requires describing the demographic composition of bycatch and formulating effective mitigation responses. We characterized the body condition, sex, and reproductive maturity of Laysan Albatross Phoebastria immutabilis and Black-footed Albatross P. nigripes collected by fishery observers in the US Alaskan groundfish and halibut fisheries (n = 129: 83 Laysan. 46 Black-fooled; 2006-2014) and the US Hawaiian longline fisheries (n = 529: 206 Laysan, 323 Black-footed; 2010-2016). Across species and regions, there was a highly significant bias toward bycatch of sexually mature birds, and most birds were in good body condition. Whereas bycatch in the Alaska region was significantly male-biased for both species, bycatch in the Hawai'i region was slightly male-biased for Laysan Albatross and moderately female-biased for Black-footed Albatross. Overall, assessment of bycalch demographics across species, regions, and seasons provides valuable information for managers and modelers who assess the impacts of bycatch on wildlife populations. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): |
En la pesca, la capture incidental (o bycatch) de especies no objetivo, incluidas aves marinas, es el resultado de interacciones complejas entre las especies y el esfuerzo pesquero. Si bien la comprension de la magnitud de la capture incidental es esencial para comprender su impacto en las especies capturadas incidentalmente, una caraeterizacion complela requiere describir la composicion demografica de la capture incidental y formular respuestas efeclivas de mitigacion. Caracterizamos la composicion corporal, el sexo y la madurez reproductiva del Albatros de Laysan Phoebastria immutabilis y el Albatros de Patas negras P. nigripes recoleclados por observadores cientiflcos en dos pesquerfas de EE.UU: las pesquerfas de peces de fondo y Halibut de Alaska (n = 129: 83 Laysan, 46 Patas negras; 2006-2014) y las pesquerias de palangre en Hawai (n = 529: 206 Laysan, 323 Patas negras; 2010-2016). Para las dos especies y regiones estudiadas, se verifico un sesgo altamente significative por la capture de aves sexualmente maduras, y en buenas condiciones corporales. A pesar que el bycatch en la region de Alaska evidencio un elevado sesgo hacia machos en ambas especies, las de Hawai fueron ligeramente sesgadas hacia machos en los Laysan y moderadamente sesgadas hacia hembras en los de Patas negras. En general, la evaluation de la demografi'a dc la capture incidental a traves de especies, regiones y estaciones proporciona information valiosa para los administradores de pesquerfas y los modeladores que evaluan los impactos de la capture incidental en las poblaciones de vida silvestre. [ABSTRACT FROM AUTHOR] |
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