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http://dx.doi.org/10.35399/ISK.32.2.7

Isotopic Evidence for Ontogenetic Shift in Food Resource Utilization during the Migration of the Slipmouth Leiognathus nuchalis in Gwangyang Bay, Korea  

Choi, Bohyung (Fisheries Science Institute, Chonnam National University)
Jo, Hyunbin (Fisheries Science Institute, Chonnam National University)
Park, Kiyun (Fisheries Science Institute, Chonnam National University)
Kwak, Ihn-Sil (Fisheries Science Institute, Chonnam National University)
Publication Information
Korean Journal of Ichthyology / v.32, no.2, 2020 , pp. 84-90 More about this Journal
Abstract
We investigated carbon and nitrogen isotope ratios (δ13C and δ15N) of the slipmouth Leiognathus nuchalis to reveal the effects of body size, feeding strategy and spatial distribution on the food resource utilization during the migration in the Seomjin estuary and Gwangyang Bay. The δ13C values of L. nuchalis caught in the Seomjin estuary where the salinity is lower than 30 psu were much lower than those in the deep-bay area of Gwangyang Bay. Such a spatial heterogeneity in δ13C values of the L. nuchalis clearly indicates active feeding within the estuarine habitat. In contrast, the δ15N values of L. nuchalis showed a consistency among sites, indicating that this species occupies identical trophic level across the whole area. The slipmouth distributed throughout the bay area, reflecting its euryhaline characteristics. However, the distribution pattern appeared to be separated according to body size into smaller individuals in the low-saline estuary and larger ones in the deep bay. Overall results support the plastic feeding strategy of the slipmouth from zooplanktonic (estuarine habitat) to epibenthic (deep-bay habitat) feeder during the migration between estuarine to deep-bay habitats.
Keywords
Leiognathus nuchalis; estuary; stable isotope; habitat properties;
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