The density of Siasia (Sipunculus nodus) population based on the differences in the substrate of the sea grasses beds on the waters of Saparua Island
Abstract
Sipuncula, a marine biota which is commonly called a peanut worm, is a marine biota that is a little "controversial". Some literature also refers to these animals as "unsegmented marine worms" or unsegmented marine worms. Siasia (Sipunculus nodus) usually lives in coastal areas, especially around seagrass beds, mangrove forests, and coral reefs. These biotas tend to inhabit the bottom of the waters, especially in the substrate, so they are categorized as infauna benthic organisms. Siasia (S. nodus) can inhabit soft and hard substrate areas. Based on its ecological function, seagrass forms associations with various kinds of marine life as food providers, shelters, and places to live, causing high diversity of marine life. The basic substrate in the form of flat stones and gravel is a good living environment for macrozoobenthos because it is rich in organic compounds so it has a big population density and diversity.The bottom of the waters in the form of sand and fine sediment is not a good living environment for benthic animals. Factors affecting density and diversity are environmental conditions, habitat, and diet. The same factors also affect the nutritional content of Siasia (S. nodus). So, it is feared that when the population density of Siasia (S. nodus) becomes high in the water there will be competition for food which will have a direct impact on the nutritional content of Siasia (S. nodus). The population density of each water is different, so it is necessary to research the population density of Siasia (S. nodus) based on differences in the substrate of the seagrass area in the waters of Saparua Island, Maluku Province, Central Maluku Regency. The highest population density value of Siasia (Sipunculus nodus) in Saparua Island waters is found in Siri-sori State and the lowest is in Paperu Country.
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