Diel changes in resource use and diet overlap in temperate stream fishes

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• 作者：Hikaru Nakagawa (1)
  Hideyuki Yamane (1)
  Masaki Yasugi (1)
  Tomohiko Fujita (2)
  Kenichi Yokoi (3)
  Hiroshi Ashiwa (1)
  Naoki Kitada (3)
  Hiroki Takano (4)
  Noriyasu Suzuki (5)
  Junpei Kishimoto (6)
  Hajime Maeda (6)
  Hitomi Yamano (3)
  Takehiko Ito (3)
  Hiroaki Maruyama (5)
  Koji Tominaga (1)
  Emi Hatakeyama (5)
  Motoyasu Goto (1)
  Daisuke Takahashi (7)
  
• 关键词：Temporal niche ; Diel change ; Nocturnal and diurnal ; Stream fish ; Stream community
• 刊名：Ecological Research
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：27
• 期：2
• 页码：417-426
• 全文大小：442KB
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• 作者单位：Hikaru Nakagawa (1)
  Hideyuki Yamane (1)
  Masaki Yasugi (1)
  Tomohiko Fujita (2)
  Kenichi Yokoi (3)
  Hiroshi Ashiwa (1)
  Naoki Kitada (3)
  Hiroki Takano (4)
  Noriyasu Suzuki (5)
  Junpei Kishimoto (6)
  Hajime Maeda (6)
  Hitomi Yamano (3)
  Takehiko Ito (3)
  Hiroaki Maruyama (5)
  Koji Tominaga (1)
  Emi Hatakeyama (5)
  Motoyasu Goto (1)
  Daisuke Takahashi (7)
  
  1. Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, Japan
  2. Civil Engineering and Eco-Technology Consultants, 23-2 Hgashi-ikebukuro 2-chome, Toyoshima-ku, Tokyo, Japan
  3. Kindai University, 204 Naka-machi, Nara, 3327, Japan
  4. University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga, Japan
  5. Mie University, 1577 Kurimamachiya-cho, Tsu-city, Mie, Japan
  6. Osaka Kyoiku University, 698-1 Asahigaoka 1-chome, Kashiwara, Osaka, Japan
  7. Faculty of Tourism and Environmental Studies, Nagano University, 658-1 Shimono-gou, Ueda, Nagano, Japan
  

文摘

Interspecific variation in diel-scale temporal niches is common in natural communities. Such variation changes population dynamics via effects on the growth and reproduction of individuals. Also at the community level, theory predicts that animals can reduce competition for shared resources by changing diel activity in certain situations. However, the role of diel activity at the community-level has not been examined sufficiently. In this study, to examine whether the diel-scale temporal niche act as a competition-mitigating mechanism for stream fishes at the community level, we surveyed diel changes in microhabitat use and foraging, and the pattern of interspecific diet overlap in the middle reaches of a temperate stream where various fish species that seemed to be either nocturnal or diurnal coexisted. Our results suggest that the fishes forage during both daytime and night, but change their foraging mode at different times of the day, so that the foraging habits of these fish species cannot be divided simply into nocturnal and diurnal. Furthermore, fishes appeared to aggregate in the vicinity of common food resources during time zones with high availability of the resources, and therefore, inter-guild diet overlap was high during certain time zones. On the other hand, when inter-guild diet overlap was low, each fish species used foods or microhabitats that did not any have the potential to be used by species of another guild. Therefore, we conclude that variation in diel niche use is influenced by variation in the fundamental niche and food supply or availability rather than by competitive interaction between fishes in the stream fish community.