Abstract
Research on the abundance of plankton in Tebing Tinggi Island waters ecosystem, Meranti Island District, Riau Province was conducted in March 2017. The observations focused on the phytoplankton and zooplankton communities at ten stations. The variations in the abundance of plankton on average between the location groups were 4428 to 1716224 cells/m3 and 23938 individuals/m3 (67.73%), respectively for phytoplankton and zooplankton. The structure of the phytoplankton community was observed to be dominated by 5 diatoms: Coscinodiscus, Chaetoceros, Guinardia, Navicula, and Pseudonitzshia species. However, the pre-dominant genus (>10%) was Coscinodiscus spp. with an abundance of 664,665.97 cells/m3 (99.47%) at station 5. Of the dinoflagellate group, only Ceratium clans were with the highest abundance in station 7 of 324609 cells/m3 with the location to the north of the Black Water Strait, but still in normal condition. The macroplankton community structure is dominated by the copepods group especially Calanoida, Cyclopoida and Nauplius copepods with high densities of more than 50%. On the other hand, information about the mangrove forest ecosystem and associated fauna in the ecosystem in the coastal area of Tebing Tinggi Island is still lacking. It is, therefore, necessary to conduct research that can be used as a basis to create a concept of management of marine resources in the region. Keywords: Plankton, environment condition, Tebing Tinggi Island.
Highlights
The coastal zone is a mixing area between land and sea regimes, as well as forming a dynamic balance of each component
From the results of the research in March 2017 recorded the composition of the phytoplankton clan in the waters of Tebing Tinggi Island, Meranti Islands Regency amounted to 13 genera, consisting of 10 genera diatoms and 3 genera dinoflagellate, composition dominated by diatoms clan
Copepods are always the predominant component of zooplankton, indicating that these waters are potentially enough to support the life of pelagic marine biota. This is supported by expert research, which states that pelagic fishes such as anchovy, bloating (Rastrelliger sp), lemuru (Sardinella lemuru), tembang (Sardinella gibbosa) and even skipjack (Katsuwonus pelamis) are predatory as predators of Copepod and decapod larvae
Summary
The coastal zone is a mixing area between land and sea regimes, as well as forming a dynamic balance of each component. Information about the existence of ecosystems and associated biota in it, including connectivity among ecosystems in the coastal area of Tebing Tinggi Island is very important, because the data is used as a basis in determining the policy and management of the future. To fulfill this information, research that reveals the extent of the mangrove ecosystem and the diversity, density and biota living in it needs to be done. In an effort to anticipate and overcome the occurrence of over-exploitation and improper management, it is necessary to conduct research that can be used as a basis to create the concept of marine resource management in the region
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