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KOBAYASHI Hayao Assistant Professor |
From School 【 display / non-display 】
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Nagasaki University Graduate School of Fisheries Science and Environmental Studies Graduated
2014.04 - 2021.02
Studying abroad experiences 【 display / non-display 】
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2017.12 - 2018.05 Dalhousie University Visiting student
Degree 【 display / non-display 】
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Ph.D (Marine Science) ( 2021.02 Nagasaki University )
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Bachelor (Fisheries science) ( 2014.03 Nagasaki University )
Employment Record in Research 【 display / non-display 】
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Tokyo University of Agriculture Faculty of Bio-Industry Department of Business, Natural Resource and Economic Development Assistant Professor
2024.04
External Career 【 display / non-display 】
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Tokyo University of Agriculture Faculty of Bioindustry, Department of Ocean and Fisheries Sciences Post-doctoral researcher
2022.04 - 2024.03
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Tokyo University of Agriculture Faculty of Bioindustry, Department of Ocean and Fisheries Sciences Post-doctoral researcher
2021.05 - 2022.03
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Nagasaki University Graduate School of Fisheries Science and Environmental Studies
2021.02 - 2021.04
Research Areas 【 display / non-display 】
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Life Science / Ecology and environment
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Life Science / Aquatic life science
Research Interests 【 display / non-display 】
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行動生態学
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社会構造
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海棲哺乳類学
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Marine Tourism
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マッコウクジラ
Papers 【 display / non-display 】
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Daisuke Kondoh, Wataru Tonomori, Ryota Iwasaki, Jumpei Tomiyasu, Yuka Kaneoya, Yusuke K. Kawai, Shun Ikuta, Hayao Kobayashi, Mari Kobayashi
Scientific Reports 14 ( 1 ) 11779 2024.05
Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC
Most terrestrial mammals have a vomeronasal system to detect specific chemicals. The peripheral organ of this system is a vomeronasal organ (VNO) opening to the incisive duct, and its primary integrative center is an accessory olfactory bulb (AOB). The VNO in seals is thought to be degenerated like whales and manatees, unlike otariids, because of the absence of the AOB. However, olfaction plays pivotal roles in seals, and thus we conducted a detailed morphological evaluation of the vomeronasal system of three harbor seals (Phoca vitulina). The VNO lumen was not found, and the incisive duct did not open into the oral cavity but was recognized as a fossa on the anteroventral side of the nasal cavity. This fossa is rich in mucous glands that secrete acidic mucopolysaccharides, which might originate from the vomeronasal glands. The olfactory bulb consisted only of a main olfactory bulb that received projections from the olfactory mucosa, but an AOB region was not evident. These findings clarified that harbor seals do not have a VNO to detect some chemicals, but the corresponding region is a specialized secretory organ.
DOI： 10.1038/s41598-024-62711-x
Other Link： https://www.nature.com/articles/s41598-024-62711-x
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First aerial observation of Sato's beaked whales (Berardius minimus) above the Abashiri Submarine Canyon, Hokkaido, Japan Reviewed International journal
Hayao Kobayashi, Shun Ikuta, Mari Kobayashi
Marine Mammal Science 2024.04
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
Kobayashi, H., Ikuta, S., & Kobayashi, M. (2023). First aerial observation of Sato's beaked whales (Berardius minimus) above the Abashiri Submarine Canyon, Hokkaido, Japan. Marine Mammal Science, 1–8 (Early view). https://doi.org/10.1111/mms.13099
On May 8, 2023, we found three groups of whales that appeared to be Sato's beaked whales around the Abashiri Submarine Canyon, Hokkaido, Japan, and successfully captured aerial videos using UAVs. In this paper, representing the first of its kind, we describe the external morphology of these whales in images captured by UAVs.
A digest of the aerial videos captured during this survey is available on the YouTube channel of the Tokyo University of Agriculture.
https://www.youtube.com/watch?v=XNtY4p1t_5oDOI： 10.1111/mms.13099
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KOBAYASHI Hayao, MAEDA Mitsuhiko, OHKI Erica, TAKANO Nobumichi, IKUTA Shun, KOBAYASHI Mari
Japan Cetology 33 ( 0 ) 25 - 35 2023.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Cetology Study Group of Japan
Throughout the year, various cetaceans appear along the coasts of the Sea of Okhotsk and the Nemuro Strait in Hokkaido, Japan. Since 2006, whale-watching boats have been operating in both areas, providing a valuable platform for studying the ecology of whales. The present study aims to clarify the seasonal patterns and inter-annual variations in sightings of cetaceans in both areas based on records from whale-watching boats. Monthly numbers of sailing days and days on which each species was observed were tallied from the sighting records of whale-watching boats operating off the coast of Abashiri in the Sea of Okhotsk and Rausu in the Nemuro Strait. For species with high numbers of sightings, detection rates were calculated, and seasonal and inter-annual variations were examined for each species in each area. In both areas, minke whales were sighted more frequently in the spring, Dall's porpoises in the summer, and Baird's beaked whales in the autumn. Although Pacific white-sided dolphins were most frequently observed in July, sightings also occurred in September and October off the coast of Abashiri. The period of sightings for minke whales was longer and the detection rate was higher off the coast of Abashiri than off Rausu. Conversely, the period of sightings for Dall's porpoise was longer off the coast of Rausu, and killer and sperm whales, less frequently sighted off the coast of Abashiri, were frequently sighted off Rausu. In recent years, the detection rate of minke whales has decreased in both areas, while that of fin whales has been increasing. Since factors affecting the population dynamics of both species are currently unknown, ongoing monitoring is vital for gaining a better understanding of the dynamics of both populations.
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Stereotypical diel movement and dive pattern of male sperm whales in a submarine canyon revealed by land-based and bio-logging surveys Reviewed International journal
Masao Amano, Kagari Aoki, Hayao Kobayashi, Shingo Minamikaw, Katsufumi Sato, Tsunemi Kubodera
Frontiers in Marine Science 10 1150308 2023.11
Language：English Publishing type：Research paper (scientific journal)
Male sperm whales are under pressure to grow larger in order to increase their mating opportunities, which could lead them to more efficiently forage in high latitude feeding grounds. Movement patterns of male sperm whales in Nemuro Strait, Japan, were investigated horizontally and vertically using land-based observation and bio-logging methods to determine how they facilitate foraging in the narrow submarine canyon. Eleven tagged whales showed the distinct diel pattern for dive depth, as it was deeper at night than during the day. Five-year data of land-based observation and GPS data from six tagged whales revealed the tendency of whales to change the north-south direction of their horizontal movement every 4–6 h, and this movement direction was not related to the direction of the current. Their periodic heading change is thought to be a consequence of the whales making two round trips each day within the foraging area, one during the day to shallow layers and one during the night to deep layers. These tactics may help the whales to search for prey in this narrow submarine canyon efficiently. Most whales changed their direction of movement in a similar manner, which is probably due to the whales’ tendency to stay close enough to each other to obtain information about the prey environment using the echolocation clicks of other whales. The results emphasize the ability of male sperm whales to adapt their foraging tactics according to the prey environment of their habitat and intense pressure to grow faster may be the drive for this ability. The importance of social cohesion among foraging male sperm whales was also suggested.
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Hayao KOBAYASHI, Tsuyoshi KUWAHARA, Tomomi KIMURA, Masao AMANO
Japanese Journal of Ornithology 71 ( 2 ) 203 - 205 2022.10
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：{JStage} (Ornithological Society of Japan)
DOI： 10.3838/jjo.71.203
Misc 【 display / non-display 】
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大阪湾で発見されたマッコウクジラの調査概要 -調査1. ハクジラ類の年齢と成長段階 Invited
小林 駿
国立科学博物館 特別展「海 ー生命のみなもとー」(図録) 2023.07
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other)
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A Deep Learning Approach for Identification of Individual Sperm Whales (Physeter macrocephalus) with Fluke Contour Information
Masami Komeda, Teijiro Isokawa, Kagari Aoki, Koki Tsujii, Katsufumi Sato, Kentaro Sakamoto, Takashi Iwata, Hayao Kobayashi, Masao Amano, Naotake Kamiura
FIIS-23-579 1 - 4 2023.03
Language：Japanese Publishing type：Internal/External technical report, pre-print, etc.
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種子島に座礁したマッコウクジラ -大きなクジラとちっぽけな私たち- Invited
小林 駿, 桑原 剛志, 武内 一真
セトケンニューズレター 40 1 - 3 2022.05
Authorship：Lead author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other)
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Long-term relationships between male sperm whales Invited
Megaptera 87 3 - 4 2021.07
Authorship：Lead author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)
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マッコウクジラの社会と行動 -長期観察が明らかにした怪物の素顔 Invited
小林 駿
生物の科学 遺伝 75 ( 4 ) 336 - 343 2021.06
Authorship：Lead author Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
Presentations 【 display / non-display 】
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五島海底谷の鯨類について Invited
小林駿
日本セトロジー研究会第33回（佐世保）大会 2023.06
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Seasonal patterns of hole-out sites by harbor seals using photo-identification
2022.10
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Possibility of photo identification of the around dorsal fin of fin whales, off Abashiri, Hokkaido
2022.10
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Habitat use pattern of fin whales off Abashiri, Hokkaido, Japan
2022.10
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Vocalization and behavior of ribbon seals in captivity during the breeding and molting seasons
2022.10
Teaching Experience 【 display / non-display 】
Social Activities 【 display / non-display 】
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ワイルドライフスペシャル (4K国際共同制作) 流氷からの贈リ物
Role(s)： Filming support
NHK 2023.02
Type：TV or radio program
Media Coverage 【 display / non-display 】
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遊覧船近くで約20分も…潮吹き泳ぐ"マッコウクジラ"現る シャチ100頭に続く圧巻の光景 羅臼沖 TV or radio program
UHB北海道文化放送 みんテレ 2021.07
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The Bro Bonds of Sperm Whales Internet
Hakai magazine https://hakaimagazine.com/news/the-bro-bonds-of-sperm-whales/ 2021.04
Author：Other
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男女群島とクジラの寝姿 TV or radio program
ケーブルにっぽん(長崎ケーブルメディア制作) ケーブルにっぽんプレミアム 壮観劇場 2021.01
Author：Other