Isotopic Variation of Macroinvertebrates and Their Sources of Organic Matter Along an Estuarine Gradient

  • Changseong Kim
  • Hee Yoon Kang
  • Young-Jae Lee
  • Sung-Gyu Yun
  • Chang-Keun KangEmail author
Special Issue: Climate Change and Anthropogenic Change around Korean Peninsula


Spatiotemporal patterns in the basal resources fueling the macrobenthic food web of a temperate coastal embayment subject to a low-turbidity riverine discharge (Gwangyang Bay, Korea) were evaluated using carbon and nitrogen stable isotopes. This study examined trophic links of macrobenthic food web with primary production in diverse wetland habitats along the riverine–estuarine–coastal marine continuum. δ13C and δ15N values of macrobenthic assemblages collected along the salinity gradient of the main channel and their putative sources of organic matter (i.e., riverine particulate organic matter (RPOM), Phragmites australis, microphytobenthos (MPB), phytoplankton, and Zostera marina) were determined. A permutational analysis of variance test showed seasonal uniformity in the isotopic niches of the macrobenthic community within different channel locations. In contrast, isotopic nestedness calculated for the microbenthic community emphasized clearly different trends in its isotopic niches among locations. The δ13C values of phytoplankton, suspended and sedimentary organic matter, and macrobenthic community displayed a consistently positive relationship with salinity, characterizing an important contribution of local phytoplankton to the nutrition of macrobenthic community. The isotope mixing model revealed that Phragmites-derived organic matter contributed considerably to the nutrition in the estuarine channel, whereas MPB and Zostera provided trophic subsidies to the deep bay and offshore communities. The nutritional importance of RPOM was minimal at all sites. Overall results suggest that phytoplankton production is a major nutritional contributor to the macrobenthic community in the main channel and that trapping POM originated from neighboring wetlands leads to a longitudinal isotopic niche shift in the macrobenthic community.


Trophic niche Macrobenthos Low-turbidity Coastal embayment Stable isotopes Food web 



This research was a part of the project titled “Long-term change of structure and function in marine ecosystems of Korea,” funded by the Ministry of Oceans and Fisheries, Korea.

Supplementary material

12237_2019_543_MOESM1_ESM.pdf (327 kb)
Supplementary Figure 1 Hierarchical clustering of abundances for macroinvertebrates using Bray–Curtis dissimilarity. Dashed line represents a 20% resemblance level. (PDF 327 kb)
12237_2019_543_MOESM2_ESM.docx (62 kb)
Supplementary Table 1 (DOCX 62 kb)
12237_2019_543_MOESM3_ESM.docx (40 kb)
Supplementary Table 2 (DOCX 40 kb)


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Copyright information

© Coastal and Estuarine Research Federation 2019

Authors and Affiliations

  • Changseong Kim
    • 1
  • Hee Yoon Kang
    • 1
  • Young-Jae Lee
    • 1
  • Sung-Gyu Yun
    • 2
  • Chang-Keun Kang
    • 1
    Email author
  1. 1.School of Earth Sciences and Environmental EngineeringGwangju Institute of Science and TechnologyGwangjuRepublic of Korea
  2. 2.Department of Science EducationDaegu UniversityGyeongsanRepublic of Korea

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