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Gen Nakamura
Tokyo University of Marine Science and Technology
17Publications
5H-index
64Citations
Publications 17
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#1Gen Nakamura (Tokyo University of Marine Science and Technology)H-Index: 5
Last.Tore HaugH-Index: 34
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#1Ayumi Hirose (Tokyo University of Marine Science and Technology)H-Index: 1
#2Takushi Kishida (Kyoto University)H-Index: 8
Last.Gen Nakamura (Tokyo University of Marine Science and Technology)H-Index: 5
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#1Nozomi Kobayashi (Tokyo University of Marine Science and Technology)H-Index: 1
#2Haruna OkabeH-Index: 1
Last.Senzo UchidaH-Index: 3
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The distribution and local movement patterns of humpback whales in waters off the west coast of Okinawa Island, southwest Japan, were investigated using line transect and photo-identification methodologies. Line transect surveys were conducted from 2011 to 2014 and photo-identification survey from 2006 to 2012. During the surveys, humpback whales aggregated in the areas around Ie and Kerama Islands, and tended to travel along the inshore coast of Okinawa Island when they move locally between tho...
1 CitationsSource
#1Takeharu BandoH-Index: 6
#2Gen NakamuraH-Index: 5
Last.Hidehiro KatoH-Index: 3
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Developmental changes in the body proportions of western North Pacific Bryde’s whales (Balaenoptera edeni) were investigated by examining the proportion of each body part to the total body length. The head and chest region increased to a certain body length; subsequently, the length of head region stabilized, and that of the chest region decreased. The length of the abdominal region remained constant to a certain body length and subsequently showed a marked increase, and that of the tail region ...
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#1Gen NakamuraH-Index: 5
#2Hiroshi KatsumataH-Index: 3
Last.Hidehiro KatoH-Index: 3
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The coast of Japan is a migratory corridor for the western stock of the gray whales (Eschrichtius robustus), which was once considered as extinct and remains endangered. According to the historical records, from 1955 to 2014, only 21 gray whales occurrence has been recorded in 59 years. However, from 2015 to 2016, intensive occurrence including the seven sightings and the two strandings were noted. In this paper, we found that those sightings were re-sightings of the same individual, which was i...
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#1Kazutoshi AraiH-Index: 3
#2Gen NakamuraH-Index: 5
Last.Hidehiro KatoH-Index: 3
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This report describes growth and annual reproductive cycle of female harbour porpoise (Phocoena phocoena) rescued from Japanese water in 2007. The maximum body length was 179 cm and body weight was 69.8 kg. The average daily food consumption was 7.0 kg (ranging 3.7 - 9.9 kg), 11.8% of the body weight. In this report, the porpoise was kept in 17 °C water annually and the blubber thicknesses showed almost constant throughout the year (average 18 mm, range 13 - 22 mm). Therefore, we added new evide...
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#1Gen NakamuraH-Index: 5
#2Ichiro KadowakiH-Index: 1
Last.Hidehiro KatoH-Index: 3
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Past studies have indicated that there are two different stocks (J and O stocks) in the North Pacific common minke whale Balaenoptera acutorostrata population. These two stocks differ from each other in certain characteristics, such as body size, conception dates, and genetics. However, till date, few studies have investigated differences in the external body appearance between the two stocks. Therefore, in the present study, we focused on the unique white patch on the flipper of this whale spec...
1 CitationsSource
#1Naoko MiyakawaH-Index: 1
#2Toshiya KishiroH-Index: 3
Last.Hidehiro KatoH-Index: 12
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Little is known about the morphology of the pelvic girdle of modern cetaceans, although many species have a vestigial pelvis (pelvic bone) and part of the hind limb bones inside the body. Previous studies have focused almost exclusively on hard tissues as well, despite the fact that the bones are comprised of cartilaginous tissue, especially in the case of femur. In the present study, we characterized the pelvic bones and searched for vestigial femurs among 43 North Pacific common minke whales (...
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#1Ayumi Hirose (Tokyo University of Marine Science and Technology)H-Index: 1
#2Gen NakamuraH-Index: 5
Last.Hidehiro Kato (Tokyo University of Marine Science and Technology)H-Index: 3
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The arrangement of cranial bones in cetaceans in both Odontoceti and Mysticeti has evolved to enable better adaptation to aquatic habitats, and as a result, cetacean skulls differ from those of terrestrial mammals. Their unique skull morphology has been studied to the extent that it is now known Odontoceti have unusual asymmet­ ric cranial bone structures, whereas Mysticeti have sym­ metric structures similar to other mammals (Miller 1923). Ness (1967) measured the asymmetry of odontocete skulls...
3 CitationsSource
#1Gen Nakamura (Tokyo University of Marine Science and Technology)H-Index: 5
#2Hidehiro Kato (Tokyo University of Marine Science and Technology)H-Index: 3
We investigated growth-related and sex-related morphological changes in the skulls of 144 North Pacific common minke whales Balaenoptera acutorostrata. Measurement was conducted at 39 points on the skull and mandible to extract individual allometric equations relating the length and zygomatic width of the skull. The results revealed no significant differences in skull morphology by sex except for width of occipital bone. The size relative to the skull of the anatomical parts involved in feeding,...
10 CitationsSource
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