Differences in subtidal macrobenthic community structures and influencing factors between Jindo and Jeju Islands in South Korea

Although islands in South Korea have been significantly impacted by human activities, marine ecological studies focusing on island coasts have been limited. Due to their distinct characteristics, Macrobenthos are extensively utilized to assess the impact of anthropogenic influences on the marine environment. In August 2010, August 2011, and September 2012, samples of macrobenthic communities, bottom water, and sediment were collected from the subtidal zones around southern Jindo and northern Jeju Islands. Macrobenthos were identified to the species level using a stereomicroscope. Bottom seawater quality was evaluated, with a focus on dissolved heavy metal concentrations (As, Cr, Cd, Cu, Pb, and Zn). Additionally, we measured the organic matter content and mean grain size of the sediment. There were marked differences in macrobenthic community structures between the two islands, including the number of species, species abundance, species richness index, and Pielou’s evenness index (p<..., Sampling Collection and Processing
Sample collection occurred in August 2010, August 2011, and September 2012, establishing fourteen sampling sites in Jindo (S1-S7) and Jeju Islands (S8-S14) for each collection period. At each site, sediment and macrobenthic samples were gathered using a 0.1 m² Van Veen grab; the former covering an area of 0.1 m² and the latter 0.2 m². Additionally, bottom water samples were collected using a Rosette sampler, and parameters such as temperature, salinity, pH, and dissolved oxygen (DO) were measured using a YSI 6920 multiparameter sonde (YSI Inc., Yellow Springs, OH, USA). Each site's macrobenthic samples were sieved through a 0.5 mm mesh and preserved in 10% neutral formalin solution, while sediment samples were stored in a deep freezer for subsequent analysis. A 2 L sample of bottom water was stored directly in the freezer, and an additional 2 L sample was filtered using glass-fiber filter papers. Both the filtered water and the filter paper were kept i..., , # Differences in subtidal macrobenthic community structures and influencing factors between Jindo and Jeju Islands in South Korea

[https://doi.org/10.5061/dryad.3j9kd51vd](https://doi.org/10.5061/dryad.3j9kd51vd)

## Description of the data and file structure

Sample collection occurred in August 2010, August 2011, and September 2012, establishing fourteen sampling sites in Jindo (S1-S7) and Jeju Islands (S8-S14) for each collection period (Figure 1). At each site, sediment and macrobenthic samples were gathered using a 0.1 m² Van Veen grab; the former covering an area of 0.1 m² and the latter 0.2 m². Additionally, bottom water samples were collected using a Rosette sampler, and parameters such as temperature, salinity, pH, and dissolved oxygen (DO) were measured using a YSI 6920 multiparameter sonde (YSI Inc., Yellow Springs, OH, USA). Each site's macrobenthic samples were sieved through a 0.5 mm mesh and preserved in 10% neutral formalin solution, while sediment samples were stored i...