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Ecological Research : Volume 14, Issue 3, September 1999

Ecological Research : Volume 14, Issue 2, June 1999

Ecological Research : Volume 14, Issue 1, April 1999

Ecological Research : Volume 13

Ecological Research : Volume 12

Selective foraging on terrestrial invertebrates by rainbow trout in a forested headwater stream in northern Japan

Content Provider	Springer Nature Link
Author	Naka, Shigeru Kawaguchi, Yoichi Taniguchi, Yoshiri Miyasaka, Hitoshi Shibata, Yukiyoshi Urabe, Hirokazu Kuhara, Naotoshi
Copyright Year	1999
Abstract	The important contribution of terrestrial invertebrates to the energy budget of drift-foraging fishes has been well documented in many forested headwater streams. However, relatively little attention has been focused on the behavioral mechanisms behind such intensive exploitation. We tested for the hypothesis that active prey selection by fishes would be an important determinant of terrestrial invertebrates contribution to fish diets in a forested headwater stream in northern Japan. Rainbow trout, Oncorhynchus mykiss, were estimated to consume 57.12 mg m$^{−2}$ day$^{−1}$ (dry mass) terrestrial invertebrates, 77% of their total input (73.89 mg m$^{−2}$ day$^{−1}$), there being high selectivity for the former from stream drift. Both the falling input and drift of terrestrial invertebrates peaked at around dusk, decreasing dramatically toward midnight. In contrast, both aquatic insect adults and benthic invertebrates showed pronounced nocturnal drift. Because the prey consumption rates of rainbow trout were high at dawn and dusk, decreasing around midnight, the greater contribution of terrestrial invertebrates to trout diet was regarded as being partly influenced by the difference in diel periodicity of availability among prey categories. In addition, selectivity also depended upon differences in individual prey size among aquatic insect adults, and benthic and terrestrial invertebrates, the last category being largest in both the stream drift and the trout diets. We concluded that differences in both the timing of supplies and prey size among the three prey categories were the primary factors behind the selective foraging on terrestrial invertebrates by rainbow trout.
Starting Page	351
Ending Page	360
Page Count	10
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	14
Issue Number	4
e-ISSN	14401703
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	diel periodicity forest stream prey size selective foraging stream salmonid terrestrial invertebrates Behavioural Sciences Ecology Evolutionary Biology Forestry Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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