NDLI: Trophic polymorphism in bluegill sunfish (Lepomis macrochirus) introduced into Lake Biwa: evidence from stable isotope analysis

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Trophic polymorphism in bluegill sunfish (Lepomis macrochirus) introduced into Lake Biwa: evidence from stable isotope analysis

Content Provider	Springer Nature Link
Author	Uchii, Kimiko Okuda, boru Yonekura, Ryuji Karube, Zin’ichi Matsui, Kazuaki Kawabata, Zen’ichiro
Copyright Year	2007
Abstract	Trophic polymorphism was recently reported in introduced bluegill (Lepomis macrochirus) in Lake Biwa, Japan, where three morphs are specialized in benthic invertebrates (benthivorous type), submerged aquatic plants (herbivorous type), and zooplankton (planktivorous type). We evaluated the long-term effects of food resource utilization by these trophic morphs using stable isotope ratios, δ15N and δ13C. A significant difference in δ15N was found between the benthivorous and planktivorous types. The planktivorous type had the higher δ15N value, which corresponded with the value expected from its prey, zooplankton. The lower δ15N value of the benthivorous type would be derived from the lower δ15N values of benthic prey organisms compared to zooplankton. These results support previous findings that the benthivorous and planktivorous types have different food resource utilization. In contrast, the δ15N and δ13C values of the herbivorous type were distinctly different from the expected values, indicating that this type was unlikely to utilize aquatic plants substantially, contradicting the results of the dietary analysis.
Starting Page	59
Ending Page	63
Page Count	5
File Format	PDF
ISSN	14398621
Journal	Limnology
Volume Number	8
Issue Number	1
e-ISSN	1439863X
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-02-03
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Trophic polymorphism Introduced bluegill Food resource utilization Stable isotope Ecology Environment Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology

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