NHKアーカイブス保存映像の中の鯨類ストランディング 論文要旨 Abstract

Yoshikazu Uni, Akiko Yatabe, and Hajime Ishikawa. 2015. Cetacean strandings in the moving images of the NHK archives collections. Japan Cetology, 25: 1–6.

 内訳を見ると、種別では、ヒゲクジラはコククジラ1件のみ、残りはハクジラで、マッコウクジラ1、コマッコウ2、ツチクジラ属1、アカボウクジラ7、イチョウハクジラ2、シャチ2、コビレゴンドウ4、オキゴンドウ1、カズハゴンドウ1、ハナゴンドウ4、ハンドウイルカ1、マダライルカ1、セミイルカ1、カマイルカ1の14種と、種不明小型ハク ジラ1が得られ、アカボウクジラが最も多かった。複数の種が一度に見られる事例はなかった。地域別では9道県、北海道1、茨城県3、千葉県8、神奈川県14、三重県1、愛知県1、兵庫県1、長崎県1、宮崎県1の記録があり、神奈川県が半数近くを占めた。記録地域の偏りはストランディングの頻度よりも、取材と放送の都合を反映していると考えられた。また、得られた記録のうち14件は新たに学会に報告されるものであった。

We found 31 cetacean stranding events of 32 programs in the NHK Archives Collections (Kawaguchi City, Saitama Prefecture, Japan) from 1957 to 1989.
One baleen whale and 14 toothed whale species (number) were identified from the events: gray whale Eschrichtius robustus (1), sperm whale Physeter macrocephalus (1), pygmy sperm whale Kogia breviceps (2), Cuvier's beaked whale Ziphius cavirostris (7), ginkgo-toothed beaked whale Mesoplodon ginkgodens (2), killer whale Orcinus orca (2), short-finned pilot whale Globi- cephala macrorhynchus (4), false killer whale Pseudorca crassidens (1),melon-headed whale Pepono- cephala electra (1), Risso's dolphin Grampus griseus (4), bottlenose dolphin Tursiops truncatus (1), pantropical spotted dolphin Stenella attenuata (1), northern right whale dolphin Lissodelphis borealis (1) and Pacific white-sided dolphin Lagenorhynchus obliquidens (1). One Berardius sp. was also recorded. These events occurred in 9 prefectures; Hokkaido (1), Ibaraki (3), Chiba (8), Kanagawa (14), Mie (1), Aichi (1), Hyogo (1), Nagasaki (1) and Miyazaki (1). Cuvier's beaked whale was the most frequent and all events of this species were recorded in Kanagawa prefecture. It seems the numbers in locality dose not reflect frequency distribution of the events because the data source (NHK Archives Collections) has principally collected Kanto area local news. Of 31 events, 14 were not listed in the stranding database of Whale Labora- tory, Institute of Cetacean Research and National Museum of Nature and Science.
Except for the stranding events, rare pygmy killer whales Feresa attenuata were recorded in dolphin fishery in Futo in Shizuoka and in Taiji in Wakayama prefectures.

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