Ｏ1 Northwest Coast Indians' impressions of killer whales：Resident and transient killer whales in British Colombia, Washington and Southeastern Alaska.Keiko Takahashi (Japanese Society of Ethnology) |
Ｏ2 Resemblance of the trend between cetacean stranding and heavy oil washing ashore (HＡXODKA oil spill accident) on the coast of Niigata District, including Sado Island, in the Sea of Japan.○Yukihiro Nakamura (Johetsu City Aquar.), Yoshiharu Honma (Niigata Univ. Sch. Med.), Akira Aoyagi (Teradomari Town Aquar.), and Kazuhiro Minowa (Kashiwazaki City Mus.) |
Ｏ3 Further report on gonadal histology of the marine mammals stranded on the coastof Toyama (Etchu) and Niigata (Echigo) Prefectures, Sea of Japan-I.○Yoshiharu Honma, Tatsuo Ushiki, Masaei Takeda (3rd Dept.Anat.,Niigata Univ.Sch.Med.), and Junji Shindo (Niigata City Aquar.) |
Ｏ4 Environment of Yamagata area and fossil cetaceansKazuo Nagasawa (Takahata High School) Many fossil cetaceans have been yielded from the Neogene marine sediments distributed in Yamagata Prefecture. More than one hundred fossil records were accumulated from the area so far. However most of those were partial bones and there were very few complete skeletons. Some fossils were important parts of skeleton for taxonomy. Some of features of the fossil records from the area were summarized as follows: The fossils dated back to approximately fifteen to two million years ago in the Neogene period. The number of fossil cetaceans in the area increased chronologically from the Late Miocene period through the Early Pliocene period and decreased suddenly in the Late Pliocene period. The most abundant fossil cetaceans were obtained from the Early Pliocene clastic rocks in the Shinjo Basin in the northern part of Yamagata Prefecture. Few fossils were found from the Ou Backbone Range area which runs along the eastern margin of Yamagata Prefecture from the north to the south. Some specimens were taxonomically examined and were identified as the following taxa: families of Physeteridae, Ziphiidae, Delphinidae, Balaenidae and Balaenopteridae, and genuses of Scaldicetus, Mesoplodon, Orcinus, Balaena, Balaenoptera and Megaptera. |
Ｏ5 Problems in comparative morphology of mysticete skullsMasayuki Oishi (Iwate Prefectural Museum) |
Ｏ6 Classification and geological age of a fossil baleen whale from Teshio-cho, Hokkaido○Eriko Sato (Niigata City), Masaichi Kimura (Sapporo Campus, Hokkaido University of Education), and Akihiko Suzuki (Earth Science， Iwamizawa College, Hokkaido University of Education) |
Ｏ7 Reports on the investigations of marine mammals stranded on the coasts of the Sea of Japan. Jan.1.1999 - Apr.30.2000Yuko Tajima (Graduate School of Agricultural and Life sciences, The University of Tokyo/Department of Zoology, National Science Museum) This study is a report on stranded marine mammals from the coasts of the Sea of Japan during the period of 1. Jan. 1999 and 30. Apr. 2000, with some emphasis on results of pathological investigations. Materials studied are five cetacean and two pinniped species, totaling thirtynine individuals. The results include pulmonary edema and enphysema, severe systemic congection or acute circulatory failure, some ulcer of stomach and focal fibrosis of kidney caused by parasites, severe emaciation and enlargement of certain lymph nodes. Many foreign materials are found in the first and the second chambers of stomach in six out of eleven Stejneger's beaked whales. This investigation is carried out by the National Science Museum, Tokyo. |
Ｏ8 Methods
for Age Determination of Mesoplodon stejnegeri based on Growth Patterns
of Dental Hard Tissues
|
Ｏ9 Rescue and medical treatment of a live stranded Cetacean (Grampus griseus) conducted by Niigata City Aquarium○Noriko Hirano, Junji Shindo, Takashi Nomura, Atsushi Yamato, Hiroya Tamura, Haruhiko Kato, Noriko Yamagiwa, Hiromi Yamazaki, and Izumi Hasegawa (Niigata City Aquarium） |
Ｏ10 The live stranding of large Cetacean in Japan○Michiru Ogino (National Science Museum Friendship Club) and Hajime Ishikawa (Institute of Cetacean Research) We analyzed 325 cases of cetacean live stranding recorded in the Institute of Cetacean Research (ICR) Stranding Database 001201. Of large species, the majority were killer whales Orcinus orca, short-finned pilot whales Globicephala macrorhynchus, false killer whales Pseudorca crassidens and Cuvier's beaked whales Ziphius cavirostris. Of small species, the majority were striped dolphins Stenella coeruleoalba, spotted dolphins Stenella attenuata, Risso's dolphins Grampus griseus, common dolphins Delphinus delphis and Kogia sp. Most of these species are thought to have a well developed social structure. Most of them are subtropical and pelagic. On the other hand, though large numbers of Pacific white-sided dolphins Lagenorhynchus obliquidens and finless porpoises Neophocaena phocaenoides are washed-up, they are rarely stranded alive. Most stranded cetaceans only survive up to 48 hours. The survival rate of stranded cetaceans rescued and cared for in aquariums is under 13% after one year. This suggests that most of the live stranded animals directly released to the sea might die in spite of rescue effort. A case study of a sperm whale Physeter macrocephalus stranded alive in April 2000 suggests that: 1) official action with the support of whale scientists is important in the rescue of large species; 2) human slaughtering of stranded whales should be considered. |
Ｏ11 We need to establish a Stranding Network in JapanTadasu K. Yamada (Dept. of Zoology, National Science Museum, Tokyo) |
Ｏ12 Cetaceans off the Ogasawara Islands: a video presentation of Ziphius spYoshihiro Hayashi (Team Orcas) |
Ｏ13 Physical examination of bottlenose dolphins at Niigata City Aquarium○Michiaki Suzuki, Haruhiko Kato, Takashi Nomura, Junji Shindo, Atsushi Yamato, Teruyo Matsumoto, Hiroya Tamura, Noriko Hirano, Noriko Yamagiwa, and Izumi Hasegawa (Niigata City Aquarium) |
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