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<p>Climate-driven increases in seawater temperature affect the overall marine ecosystem on account of changes in the species distribution and community structure of marine organisms. We examined the alterations in the community structure and feeding guild composition of macrobenthos, along with their potential food resources (Chl-<i>a</i>, zooplankton density, and macroalgal biomass), in response to the rise in seawater temperature over the past decade (2011–2021) in the rocky subtidal habitats around Gageodo, influenced by the Tsushima Warm Current. The water temperatures in Gageodo increased by 0.22&#xa0;°C/year on average; during the same time frame, the species number and abundance of the macrobenthos community decreased, whereas the biomass increased. In terms of feeding guilds, the ratios of filter feeder and carnivores increased, whereas those of the grazing guild decreased sharply. The decrease in the biomass of grazing guild (from 4.72 to 0.19 g/m<sup>2</sup>) was likely related to the top-down predation effect caused by the increase in the number of carnivorous predators (from 0.32 to 2.86 g/m<sup>2</sup>) preying on grazers, although the abundance of their prey resources (i.e., macroalgae) had increased. It is unclear whether the increase in the ratio of the filter-feeding guild was associated with quantitative changes in their prey items (i.e., phytoplankton and zooplankton). This study provides fundamental information regarding the structural modifications of the macrobenthos community caused by increasing seawater temperature, and emphasizes the importance of expanding and managing marine protected areas to preserve marine ecosystems and protect them against the impacts of climate change.</p>

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Decadal Shifts in Macrobenthic Communities and Feeding Types in the Rocky Subtidal Zone of Gageodo, Southwestern Korea

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Hyun-Jung Kim,
  • Chung Il Lee,
  • Su Jin Lee,
  • Choul-Hee Hwang,
  • Young Yoon Kim,
  • InSeo Hwang,
  • Soo-Yeon Cho,
  • HoJoon Choi,
  • Joo Myun Park

摘要

Climate-driven increases in seawater temperature affect the overall marine ecosystem on account of changes in the species distribution and community structure of marine organisms. We examined the alterations in the community structure and feeding guild composition of macrobenthos, along with their potential food resources (Chl-a, zooplankton density, and macroalgal biomass), in response to the rise in seawater temperature over the past decade (2011–2021) in the rocky subtidal habitats around Gageodo, influenced by the Tsushima Warm Current. The water temperatures in Gageodo increased by 0.22 °C/year on average; during the same time frame, the species number and abundance of the macrobenthos community decreased, whereas the biomass increased. In terms of feeding guilds, the ratios of filter feeder and carnivores increased, whereas those of the grazing guild decreased sharply. The decrease in the biomass of grazing guild (from 4.72 to 0.19 g/m2) was likely related to the top-down predation effect caused by the increase in the number of carnivorous predators (from 0.32 to 2.86 g/m2) preying on grazers, although the abundance of their prey resources (i.e., macroalgae) had increased. It is unclear whether the increase in the ratio of the filter-feeding guild was associated with quantitative changes in their prey items (i.e., phytoplankton and zooplankton). This study provides fundamental information regarding the structural modifications of the macrobenthos community caused by increasing seawater temperature, and emphasizes the importance of expanding and managing marine protected areas to preserve marine ecosystems and protect them against the impacts of climate change.