Seabird observations during fishing longline operations in the Antarctic region (Statistical Subareas 48.1, 48.2 and 88.3)
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1999
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Abstract
En febrero y marzo de 1998 se efectuó un crucero de 43 días de duración con el buque
espinelero factoría Tierra del Fuego, como parte de los Proyectos de Nuevas Pesquerías desarrollado por Chile en la Antártica (Subáreas estadísticas 88.3, 48.1 Y 48.2). Durante dicha investigación se adoptaron todas las medidas vigentes para impedir la mortalidad incidental de aves, realizándose además observaciones de aves marinas en cada uno de los 52 lances realizados con espineles de diseño español. No se registró captura y mortalidad incidental de aves durante las faenas de pesca realizadas. En todo el crucero se observó un total de 436
aves, siendo la mas abundante Thulassarche melanophrys con 204 avistamientos, seguida de Oceanities oceanicus con 77, Catharacta lonnbergi con 40 y Thalassarche chrysostoma con 37. La Subárea que presentó una mayor abundancia relativa en avistamientos fue la 48.1 con 11.1 aves/lance, seguida por la 48.2 y la 88.3 con 7.6 y 5.0 aves/lance. La distribución de especies fue diferente en cada Subárea, siendo la mas abundante la Subárea 48.1 con un total de 10 especies observadas y la menos abundante la 48:2, con sólo 4 especies presentes.
A 43-day cruise on FV Tierra del Fuego took place in February and March 1998, as part of the New Fisheries Project developed by Chile in the Antarctic (Statistical Subareas 88.3, 48.1 and 48.2). During this research study every measure currently in force was used to prevent incidental seabird mortality, carrying out bird observations in each one of the 52 settings with Spanish-designed longlines as well. Neither bird capture nor mortality was reported during the fishing activities. During the entire cruise a total of 436 birds were observed. The most abundant was Thalassarche melanophrys, with 204 sightings, followed by Oceanities oceanicus, with 77; Catharacta lonnbergi, with 40; and Thalassarche chrysostoma, with 37. The highest relative abundance was found in Subarea 48.1 with 11.1 birds/haul, followed by Subareas 48.2 and 88.3 with 7.6 and 5.0 birds/haul, respectively. The highest number of species was found in Subarea 48.1 with 19 species observed and the least in Subarea 48.2 with the presence of only 4 species.
A 43-day cruise on FV Tierra del Fuego took place in February and March 1998, as part of the New Fisheries Project developed by Chile in the Antarctic (Statistical Subareas 88.3, 48.1 and 48.2). During this research study every measure currently in force was used to prevent incidental seabird mortality, carrying out bird observations in each one of the 52 settings with Spanish-designed longlines as well. Neither bird capture nor mortality was reported during the fishing activities. During the entire cruise a total of 436 birds were observed. The most abundant was Thalassarche melanophrys, with 204 sightings, followed by Oceanities oceanicus, with 77; Catharacta lonnbergi, with 40; and Thalassarche chrysostoma, with 37. The highest relative abundance was found in Subarea 48.1 with 11.1 birds/haul, followed by Subareas 48.2 and 88.3 with 7.6 and 5.0 birds/haul, respectively. The highest number of species was found in Subarea 48.1 with 19 species observed and the least in Subarea 48.2 with the presence of only 4 species.
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Aves marinas
Citation
Serie Científica, nº 49, pp. 23-28, 1999