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The Spanish Oceanographic Institute was created following Royal Decree of 17 April 1914. It is a public research body devoted to research into marine sciences, especially in terms of the scientific knowledge of oceans, sustainability of fisheries resources and the marine environment. IEO depends on the Ministry of Economy and Competitiveness, directly reporting to the Secretariat of State for Research.

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Paper

Written Paper

Distribution and abundance of long-finned pilot whales in the North Atlantic, estimated from NASS-87 and NASS-89 data  [1991]

Buckland, S.T. (Stephen); Bloch, D.; Cattanach, K.L.; Gunnlaugsson, T. (Torvaldur); et al.

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During the summers of 1987 and 1989, large scale transect surveys were conductedthroughout the North Atlantic by several national agencies in Denmark (off Greenland),Faroe Islands, Iceland, Norway and Spain (North Atlantic Sightings Surveys, NASS-87 andNASS-89). This paper analyses the pilot whale (Globicephala melas) survey data collected bythree Icelandic and one Faroese survey vessel in 1987, and four Icelandic, one Faroese andone Spanish vessel in 1989. Norwegian survey vessels operated north and east of this area inboth years, but only five groups (three primary sightings) were observed in 1989 and none in1987. Furthermore, no sightings were made in the area north and northeast of Iceland, thusindicating that the joint surveys covered the northernmost areas of pilot whale distributioneast of 42°W. The area further to the west was not covered in either survey. The coastalEuropean waters between 42-52°N were covered by the Spanish vessel in 1989. Sightingsmade in 1989 by the Icelandic vessels tended to be at the southernmost boundaries of thesurvey area.The present data were examined with respect to several potential stratification factors,namely geographic block, Beaufort (i.e. wind speed), vessel and school size, but sample sizeprecluded stratification by all these factors simultaneously. The encounter rate was generallylower in the 1987 survey than in 1989, but the difference was not statistically significant. Thetotal estimate for the 1989 survey, c
overing a wider area and further to the south than in 1987,was 778,000 (CV=0.295). This is regarded as the best available estimate of the total stock oflong-finned pilot whales in the northeastern North Atlantic Ocean, although small numbersoccur outside the NASS survey areas. The paper discusses potential biases in the abundanceestimates, and the problems of estimating pilot whale abundance from sightings data.

Bibliographic information

Language:
English
Type:
Working Paper
In AGRIS since:
2015
All titles:
"Distribution and abundance of long-finned pilot whales in the North Atlantic, estimated from NASS-87 and NASS-89 data"@eng
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Bibliographic information

Language:
English
Type:
Working Paper
In AGRIS since:
2015
All titles:
"Distribution and abundance of long-finned pilot whales in the North Atlantic, estimated from NASS-87 and NASS-89 data"@eng