Anthropogenic influences on benthic food web dynamics by interrupted freshwater discharge in a closed Geum River estuary, Korea SCIE SCOPUS

Cited 8 time in WEB OF SCIENCE Cited 8 time in Scopus
Title
Anthropogenic influences on benthic food web dynamics by interrupted freshwater discharge in a closed Geum River estuary, Korea
Author(s)
Noh, Junsung; Yoon, Seo Joon; Kim, Hosang; Lee, Changkeun; Kwon, Bong-Oh; Lee, Yeonjung; Hong, Seongjin; Kim, Jaeseong; Ryu, Jongseong; Khim, Jong Seong
KIOST Author(s)
Lee, Yeonjung(이연정)
Publication Year
2019-10
Abstract
Stable isotope analysis was used to investigate the benthic food web dynamics in the Geum River estuary where continuous river flow has been blocked by a sea dike over the past 25 years. In order to address the dike effect(s) on distribution of food sources (i.e., organic matters and microphytobenthos) and their utilization by marine predators, a three years monitoring survey (total of 30 surveys) was seasonally conducted at four fixed locations at both inside of dike and outer tidal flats. All the collected biota (total of 19 species;> 1100 individuals and microphytobenthos) and abiotic (n = 118) samples were analyzed for carbon (delta C-13) and nitrogen (delta N-15) stable isotopes. In particular, two dominant marine bivalves inhabiting outer reach of tidal flats, Mactra veneriformis and Cyclina sinensis, were targeted to identify their feeding strategies that being related to a year-round population growth. In general, the stable isotopic signatures of samples indicated dissimilarity in distribution of organic matters between inside and outside of dike, supporting geographical and/or trophic isolation. The taxa-dependent trophic levels are also evidenced in consistent manner, with two to three levels being positioned over the years. Meantime, their dietary contributions varied in time, i.e., seasonal chances in compositions of major food sources (microphytobenthos and particulate organic matters) were observed for two target bivalves. Such temporal variations could be further linked to selective feedings that evidenced by age(size)-dependent and/or tissue specific distributions. Altogether, the present study suggested seasonality, diet preference, and growth dependent food web dynamics in the Geum River estuary. Overall, the present study suggested that the stable isotopic technique could be a powerful tool for characterizing the long-term anthropogenic influences of a sea dike on marine food-web dynamics.
ISSN
0160-4120
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40326
DOI
10.1016/j.envint.2019.104981
Bibliographic Citation
ENVIRONMENT INTERNATIONAL, v.131, 2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
TERRESTRIAL ORGANIC-MATTER; NITROGEN STABLE-ISOTOPES; TIDAL FLAT; CERASTODERMA-EDULE; CRASSOSTREA-GIGAS; TROPHIC POSITION; YELLOW SEA; CARBON; DELTA-C-13; MICROPHYTOBENTHOS
Keywords
Stable isotopes; Tidal flats; Sea dike; Dam; Yellow Sea; Marine invertebrates
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Marine biogeochemistry,Stable isotope ecology,해양생지화학,안정동위원소 생태학

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