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タイトル: | Laboratory video recordings and underwater visual observations combined to reveal activity rhythm of red-spotted grouper and banded wrasse, and their natural assemblages |
著者: | Masuda, Reiji https://orcid.org/0000-0002-2184-1533 (unconfirmed) Matsuda, Katsuhiro Tanaka, Masaru |
著者名の別形: | 益田, 玲爾 |
キーワード: | Crepuscular activity Diel variation Epinephelus akaara Fish assemblages Twilight Underwater visual census |
発行日: | Nov-2012 |
出版者: | Springer Netherlands |
誌名: | Environmental Biology of Fishes |
巻: | 95 |
号: | 3 |
開始ページ: | 335 |
終了ページ: | 346 |
抄録: | The diel activity rhythm of red-spotted grouper Epinephelus akaara was studied both in captivity and in the wild. Behavior of solitary grouper (58 to 397 mm in total length) in a tank was video recorded using infrared illuminators under 11L/10D and two 1.5-h twilight transition periods, and was compared to that of banded wrasse Halichoeres poecilopterus, a typical diurnal fish. Underwater observations using SCUBA were also conducted in their natural habitat to reveal the behavioral activity together with a visual census of adjacent fish and crustacean assemblages. Red-spotted grouper showed a strong nocturnal activity in a tank regardless of body size as opposed to the strongly diurnal banded wrasse. Activity of groupers in natural waters was high at dawn and dusk, low at noon, and only a few individuals were observed at night. Visual census in the habitat revealed that fish abundance and species richness was highest at noon, lowest at night, and intermediate at dawn and dusk. The opposite trend was found in crustacean assemblages. Absence of groupers at night may reflect their nocturnal feeding migration away from the study area. Alternatively, the crepuscular activity of groupers in the wild is suggested to be an adaptation to feed on small fishes that shift between daytime activity and nighttime rest and/or on nocturnal crustaceans that show the opposite activity pattern. |
著作権等: | The final publication is available at www.springerlink.com この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/160388 |
DOI(出版社版): | 10.1007/s10641-012-0006-5 |
出現コレクション: | 学術雑誌掲載論文等 |
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