Distribution and Seasonal Changes of Fisheries Resources  in the Gwangyang bay

Kim, Heung-Yun; Han, Inwoo; Oh, Wooseok; Choi, Jong-Soo; Lee, Kyounghoon

doi:10.13000/jfmse.2018.12.30.6.2163

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Estuarine and coastal nekton communities are generally characterized by many rare species (Magurran and Henderson, 2003) and spatiotemporally distributed species assemblages (Whitfield et al, 2012;Rees et al, 2018). The low species abundance and the spatial pattern in community composition found here were very similar to other studies in GYB and surrounding coastal areas (Seo et al, 2013;Kim et al, 2018). However, we observed inconclusive seasonal patterns in species composition, which could arise from the highly random distribution of species, very low numbers of seasonal migrants, and stable prey communities for resident species.…”

Section: Discussionsupporting

confidence: 85%

Phytoplankton Fuel Fish Food Webs in a Low-Turbidity Temperate Coastal Embayment: A Stable Isotope Approach

Kundu

Kim

et al. 2021

Front. Mar. Sci.

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Trophic contributions of diverse OM sources to estuarine and coastal food webs differ substantially across systems around the world, particularly for nekton (fish, cephalopods, and crustaceans), which utilize basal resources from multiple sources over space and time because of their mobility and feeding behaviors at multiple trophic levels. We investigated the contributions of putative OM sources to fish food webs and assessed the spatiotemporal patterns, structures, and trophic connectivity in fish food webs across four seasons from three closely spaced (10–15 km) sites: an estuarine channel (EC), a deep bay (DB), and an offshore (OS) region in Gwangyang Bay, a high-productivity, low-turbidity estuarine embayment off the Republic of Korea. While nearly all previous studies have focused on few representative species, we examined δ13C and δ15N values of whole nekton communities along with dominant benthic macro-invertebrates, zooplankton, and their putative primary food sources. The δ13C and δ15N values coupled with MixSIAR, a Bayesian mixing model, revealed that these communities utilized multiple primary producers, but phytoplankton comprised the primary trophic contributor (46.6–69.1%). Microphytobenthos (15.8–20.4%) and the seagrass Zostera marina (8.6–19.8%) made substantial contributions, but the role of river-borne terrestrial organic matter was negligible. Spatially different species composition and stable isotope values, but higher utilization of coastal phytoplankton by estuarine fish, indicated disparate food webs structures between the EC and DB/OS coastal areas, with considerable trophic connectivity. Greater overlaps in fish and cephalopod isotopic niches than among other consumers and a higher estimated carbon trophic enrichment factor for EC nekton confirmed feeding migration-mediated biological transport of coastal OM sources to the estuary. Further, the seasonally consistent structures and resource utilization patterns indicate that fish food webs are resilient to changes at lower trophic levels. Our results contrast with those for other highly turbid coastal systems depending highly on diversified basal sources, including exported terrestrial and wetland detritus alongside autochthonous phytoplankton. Finally, this study provides a novel perspective on the role of OM sources in such low turbidity and highly productive coastal embayments and enhances our understanding of marine ecosystems.

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Section: Discussionsupporting

confidence: 85%

Phytoplankton Fuel Fish Food Webs in a Low-Turbidity Temperate Coastal Embayment: A Stable Isotope Approach

Kundu

Kim

et al. 2021

Front. Mar. Sci.

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show abstract

Section: Discussionsupporting

confidence: 85%

Data_Sheet_1.docx

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“…The observed seasonal succession of the deep-bay assemblages, although not great, seems to be attributed to the addition of a few seasonal (or temporary) migrants. As a result, the nekton assemblages were characterized by rare species in the estuarine channel and by the predominance of year-round resident species, which occupied over 80% of the total abundances 51 , 52 , with a few transient migrants in the deep bay.…”

Section: Discussionmentioning

confidence: 99%

Identifying patterns in the multitrophic community and food-web structure of a low-turbidity temperate estuarine bay

Kang

Kim

et al. 2020

Sci Rep

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Food web dynamics outline the ecosystem processes that regulate community structure. Challenges in the approaches used to capture topological descriptions of food webs arise due to the difficulties in collecting extensive empirical data with temporal and spatial variations in community structure and predator–prey interactions. Here, we use a Kohonen self-organizing map algorithm (as a measure of community pattern) and stable isotope-mixing models (as a measure of trophic interaction) to identify food web patterns across a low-turbidity water channel of a temperate estuarine-coastal continuum. We find a spatial difference in the patterns of community compositions between the estuarine and deep-bay channels and a seasonal difference in the plankton pattern but less in the macrobenthos and nekton communities. Dietary mixing models of co-occurring dominant taxa reveal site-specific but unchanging food web topologies and the prominent role of phytoplankton in the trophic base of pelagic and prevalent-detrital benthic pathways. Our approach provides realistic frameworks for linking key nodes from producers to predators in trophic networks.

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Distribution and Seasonal Changes of Fisheries Resources in the Gwangyang bay

Cited by 3 publications

References 12 publications

Phytoplankton Fuel Fish Food Webs in a Low-Turbidity Temperate Coastal Embayment: A Stable Isotope Approach

Phytoplankton Fuel Fish Food Webs in a Low-Turbidity Temperate Coastal Embayment: A Stable Isotope Approach

Data_Sheet_1.docx

Identifying patterns in the multitrophic community and food-web structure of a low-turbidity temperate estuarine bay

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