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

Content Provider	Springer Nature Link
Author	Nakagawa, Hikaru Yamane, Hideyuki Yasugi, Masaki Fujita, Tomohiko Yokoi, Kenichi Ashiwa, Hiroshi Kitada, Naoki Taka, Hiroki Suzuki, riyasu Kishimoto, Junpei Maeda, Hajime Yama, Hitomi Ito, Takehiko Maruyama, Hiroaki Tominaga, Koji Hatakeyama, Emi Goto, Motoyasu Takahashi, Daisuke
Copyright Year	2011
Abstract	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.
Starting Page	417
Ending Page	426
Page Count	10
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	27
Issue Number	2
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2011-12-29
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Temporal niche Diel change Nocturnal and diurnal Stream fish Stream community Forestry Ecology Behavioural Sciences Evolutionary Biology Zoology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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