Population estimation of Pacific white-sided dolphins Lagenorhynchus obliquidens in Tsugaru Strait, Japan

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Other Title
  • 津軽海峡におけるカマイルカの来遊個体数推定
  • ツガル カイキョウ ニ オケル カマイルカ ノ ライユウ コタイスウ スイテイ

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Abstract

<p>Pacific white-sided dolphin (PWS) Lagenorhynchus obliquidens is the most common cetacean species found in the Tsugaru Strait, Japan. This paper estimates the population of PWS migrated in the strait. The sighting records were collected from the sighting survey in the strait between 2004 and 2010. The PWS population was estimated by using the line transect method for two periods; March to July and May, which is responds to the migration season and mostly observed season. From the limitation of the number of data, the all data from 2004 to 2010 were pooled and estimated the average population. In for March to June, the average estimated population was 4,482 (CV=0.192) and effective strip width was 111.75m. In May the total estimated population of PWS was 9,592 (CV=0.251) and effective strip width was 109.45m. Comparing to the result of the previously reported studies, it was suggested that part of PWS at the coast of both Sea of Japan and Pacific migrate to Tsugaru Strait and most of them use different routes. </p>

Journal

  • Japan Cetology

    Japan Cetology 21 (0), 15-18, 2011

    The Cetology Study Group of Japan

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