Seabird and marine-mammal attendance and by-catch in semi-industrial trawl fisheries in near-shore waters of northern Argentina

Seabird and marine-mammal attendance and by-catch in mid-water and bottom otter semi-industrial coastal pair-trawl fisheries were assessed for the first time in northern Argentina. Observers were placed onboard trawlers between autumn 2007 and autumn 2008. Fifteen marine top-predator species were as...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Pon, J.P.S., Copello, S., Moretinni, A., Lértora, H.P., Bruno, I., Bastida, J., Mauco, L., Favero, M.
Formato: JOUR
Lenguaje:English
Materias:
fishery-
marine top predators
pair-trawl coastal fisheries
South America.
top predator interactions
abundance
bycatch
ecological impact
marine mammal
mortality
nearshore environment
predator
seabird
seasonality
trawling
vessel
wind direction
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13231650_v64_n3_p237_Pon
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Seabird and marine-mammal attendance and by-catch in mid-water and bottom otter semi-industrial coastal pair-trawl fisheries were assessed for the first time in northern Argentina. Observers were placed onboard trawlers between autumn 2007 and autumn 2008. Fifteen marine top-predator species were associated with the vessels. The most abundant and frequent seabirds (trawl fisheries combined) were the kelp gull, Larus dominicanus (∼70% of total birds and >96% occurrence), and the Olrog's gull, L. atlanticus (∼12% and >50%, respectively). Other seabird taxa such as Procellariiforms and Sphenisciforms, among others, were represented in very low numbers. The only mammal species recorded was the South American sea lion, Otaria flavescens (1% and 2%, respectively). Analysis of environmental and operational variability affecting the abundance of gulls indicated a significant increase in abundance with fishing depth, time of day, seasonality, wind intensity and wind direction. Incidental mortality of top predators was low and comprised only Magellanic penguins, Spheniscus magellanicus, in the mid-water gear. The results of the present study showed that the semi-industrial trawl fisheries operating in coastal waters in northern Argentina may a have a relatively minor impact on marine top-predator populations, at least in terms of incidental capture. © CSIRO 2013.

Ejemplares similares