NDLI: Carbon and nitrogen stable isotope ratios of macroinvertebrates in the littoral zone of Lake Biwa as indicators of anthropogenic activities in the watershed

Content Provider	Springer Nature Link
Author	Karube, Zin’ichi Sakai, Yoichiro Takeyama, Tomohiro Okuda, boru Kohzu, Ayato Yoshimizu, Chikage Nagata, Toshi Tayasu, Ichiro
Copyright Year	2010
Abstract	Carbon and nitrogen stable isotope ratios (δ$^{13}$C and δ$^{15}$N) of macroinvertebrates inhabiting littoral zones of lakes can serve as useful indicators of material loading from the watershed. We collected snails (Semisulcospira spp.) and bivalves (Unio douglasiae biwae Kobelt) from 29 littoral sites in Lake Biwa near the mouths of river tributaries with various human population density (HPD) and land-use patterns. The δ$^{13}$C and δ$^{15}$N signatures were determined for three potential food sources: particulate organic matter in the pelagic zone (PPOM), riverine particulate organic matter from tributaries (RPOM) and epilithic organic matter in the littoral zone (EOM). The stable isotope mixing model revealed that snails relied mainly on EOM, and bivalves on PPOM and RPOM. Multiple regression analysis showed that intersite variation in δ$^{15}$N for snails was best explained by HPD, while variation in δ$^{15}$N of EOM and nitrate was explained to a lesser extent by HPD. Comparison with isotope signatures of their food sources and riverine nutrients revealed that snails assimilated anthropogenic nitrogen from wastewater in the watershed. Our results also showed that the δ$^{13}$C value of bivalves was marginally related to the fraction of paddy fields in the watersheds. In conclusion, the isotope signatures of macroinvertebrates inhabiting the littoral zone can be useful indicators of anthropogenic impacts from the watershed.
Starting Page	847
Ending Page	855
Page Count	9
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	25
Issue Number	4
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2010-04-02
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Material loading Lake Biwa Eutrophication Stable isotope Benthos Forestry Behavioural Sciences Evolutionary Biology Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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