Dynamics of Marine Communities

A special issue of Diversity (ISSN 1424-2818). This special issue belongs to the section "Marine Diversity".

Deadline for manuscript submissions: 31 May 2024 | Viewed by 1550

Special Issue Editor

Korea Institute of Ocean Science and Technology, Geoje 53201, Republic of Korea
Interests: benthic-pelagic coupling; food web; stable isotope ecology; community structure
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In marine ecosystems, benthic and pelagic communities have continuously experienced changes in their species composition, dominant species, and species ecology according to various anthropogenic and environmental influences. If external influences such as climate change and human activities continue, biological communities form new communities through the process of succession, resulting in changes in available biological resources. Therefore, at this point, it is important to identify fluctuations in biological communities in the marine ecosystems and influences of environmental variables, and to predict future changes. In the absence of a baseline from which to compare past and future studies; however, it is impossible to effectively predict the impacts of humans and climate change on the community ecology of the marine habitats. The purpose of this Special Issue is to publish novel and high-quality research with respect to the subjects mentioned below and related ones.

  • Long- and/or short-term dynamics of marine communities;
  • Link environmental and/or anthropogenic influences to the changes in marine communities;
  • Geographical variations in the community structures and ecology of marine species;
  • The role of predators and parasites in marine communities;
  • The effect of species introductions on marine communities;
  • Marine communities and climate change.

Dr. Joo Myun Park
Guest Editor

Manuscript Submission Information

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Published Papers (2 papers)

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Research

15 pages, 5071 KiB  
Article
Assessment of Sessile Benthic Communities in Jeju Island, Republic of Korea, Using Autonomous Reef Monitoring Structures (ARMS)
Diversity 2024, 16(2), 83; https://doi.org/10.3390/d16020083 - 26 Jan 2024
Viewed by 493
Abstract
Assessing the effectiveness of artificial structures as a monitoring tool for benthic diversity in temperate reefs is crucial to determining their relevance in reef conservation and management. In this study, we utilized Autonomous Reef Monitoring Structures (ARMS) to evaluate sessile benthic communities that [...] Read more.
Assessing the effectiveness of artificial structures as a monitoring tool for benthic diversity in temperate reefs is crucial to determining their relevance in reef conservation and management. In this study, we utilized Autonomous Reef Monitoring Structures (ARMS) to evaluate sessile benthic communities that colonized ARMS units after 12 and 34 months of immersion within distinct habitats (coral-dominated and macroalgae-dominated habitats) in Jeju Island, Korea. We used two methods: image analysis of the ARMS plates and DNA metabarcoding of the ARMS units. We found significant differences in the sessile benthic community between the plate faces, installation periods, and habitats. DNA metabarcoding also revealed differences in sessile benthic diversity among habitats. Additionally, we identified the Lithophyllum genus within the crustose coralline algae community, whose dominance might trigger a transition to coral-dominated habitats in Jeju Island. We recommend integrating ARMS image analysis with DNA metabarcoding to enhance and complement studies focusing on benthic diversity. By utilizing ARMS, this study provides valuable information for understanding sessile benthic communities and biodiversity, contributing to an enhanced understanding of the responses of ecological communities to climate change. Full article
(This article belongs to the Special Issue Dynamics of Marine Communities)
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13 pages, 4504 KiB  
Article
Impact of Complex Oceanographic Features on Seasonal Phytoplankton Community and Biodiversity from 2018 to 2020 in the Vicinity of Dokdo (Island), Offshore Korea
Diversity 2023, 15(12), 1166; https://doi.org/10.3390/d15121166 - 23 Nov 2023
Viewed by 770
Abstract
Dokdo, a volcanic island located in offshore waters, is significantly influenced by various currents and the island effect resulting from upwelling events. Despite these factors, there is a limited understanding of the seasonal changes in phytoplankton populations and their relationship with the environmental [...] Read more.
Dokdo, a volcanic island located in offshore waters, is significantly influenced by various currents and the island effect resulting from upwelling events. Despite these factors, there is a limited understanding of the seasonal changes in phytoplankton populations and their relationship with the environmental factors in the waters around Dokdo, even during dramatic shifts in phytoplankton dynamics. We focused on seasonal oceanographic features over three years (2018, 2019, and 2020) to understand the phytoplankton community structure and seasonal species succession. Winter, characterized by thorough mixing, results in high nutrient levels, leading to increased phytoplankton biomass. The dominance of the large-sized diatom Chaetoceros spp. contributes to relatively low diversity (H’: 1.14 ± 0.31). In contrast to the typical coastal waters, spring exhibits dominance by the small nano-flagellates and Cryptomonas spp. associated with a lack of surface nutrients due to increased water temperature. Summer, characterized by strong stratification, shows low phytoplankton biomass but high Chl. a concentrations, possibly influenced by picoplankton and the emergence of dinoflagellates, such as Gyrodinium sp. and Katodinium sp., which increases diversity (H’: 2.18 ± 0.28). In autumn, there is typically a phytoplankton bloom, but in 2019, an unusually low biomass occurred. This was likely due to the intrusion of deep, cold water from the bottom and low-salinity Changjiang diluted water (CDW) from the surface, increasing the water’s stability. This, in turn, led to nutrient depletion, contributing to a rise in diversity (H’: 1.14 ± 0.31). These environmentally complex waters around Dokdo result in a distinct pattern of biodiversity indices, with the highest in summer and the lowest in winter, differing from typical temperate waters. In conclusion, this research highlights the substantial influence of distinctive oceanographic features and nutrient dynamics on the phytoplankton biomass and biodiversity in the Ulleung Basin and Dokdo region. Understanding these patterns is vital for the effective management of marine ecosystems and fisheries resources, emphasizing the necessity for continued long-term monitoring in the vicinity of the Dokdo area. Full article
(This article belongs to the Special Issue Dynamics of Marine Communities)
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