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Seabird Distribution Patterns by Sighting Survey in the East Sea in Spring  

Kim, Hyun-Woo (Cetacean Research Institute, NFRDI)
Kim, Zang-Geun (Fisheries Resources Research Division, NFRDI)
Choi, Seok-Gwan (Cetacean Research Institute, NFRDI)
Publication Information
Korean Journal of Environment and Ecology / v.25, no.2, 2011 , pp. 123-131 More about this Journal
Abstract
Seabird distribution in the East Sea was studied from April to May 2007 using line transect counts. We observed a total of 1,379 individuals of 23 species including 14 species of seabird. The overall seabird sighting rate was 2.5 birds $km^{-2}$. The Streaked shearwater(Calonectris leucomelas)(74.5%) was the numerically dominant species. Ancient murrelets(Synthliboramphus antiquus)(8.3%), red-throated divers(Gavia stellata)(5.0%), common terns(Sterna hirundo)(2.1%), Pacific divers(Gavia pacifica)(2.0%), and black-tailed gulls (Larus crassirostris)(1.1%) were also frequently observed. The sightings of seabirds was highest between $36^{\circ}N$ and $37^{\circ}N$ of the coastal area of the Korean peninsular. However, the index of species diversity(H') was higher between $35^{\circ}N$ and $36^{\circ}N$. The sighting rates of most observed species decreased with distance from the coastline. The distribution patterns of Streaked shearwater were linked to the variation in the distribution pattern of minke whales(Balaenoptera acutorostrata). Also, spatial segregation was found in the distributions of the two species of divers(Gavia spp.).
Keywords
LINE TRANSECT COUNTS; SIGHTING RATES; DOMINANT SPECIES; INDEX OF SPECIES DIVERSITY;
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