The Difference in Abundance of Echinoideas on Coral Ecosystem and Seagrass Beds in Pancuran Belakang, Karimunjawa, Jepara

Abstract

Phyllum of echinoderms has a large role on the ecosystems of coral reefs and seagrass beds, especially their various roles in food
web, which are herbivorous covering, carnivorous, or as detritus eaters. One of the echinoderms which is always found in the coral
reefs region and seagrass beds is the echinoidea. Echinoidea mostly inhabits coral reef ecosystem and seagrass beds and found on
hard substrates, especially in seagrass beds substrates that consist of mixtures of sand and crushed corals. The purpose of this
research was to know the difference in the echinoidea abundances of coral reef ecosystem and seagrass beds in Pancuran Belakang,
Karimunjawa, Jepara in the month of May 2014. Research methodology that was used is a method of direct observation that is by
means of observing the species of echinoidea found in coral reef ecosystems and seagrass beds and water quality conditions as
supporting data. The research results showed that the cover of coral reefs and seagrass beds in Pancuran Belakang Karimunjawa in
the category of good which are of 55.29 % on coarl reef and 61.94 % seagrass. The echinoidea that was found in reefs and seagrass
beds is Diadema setosum (123;36 ind (150 m)-2), Diadema antilarum (63;18 ind(150 m)-2), Echinothrix calamaris (34;22 ind (150
m)-2), Mespilia globulesa (12;0 ind(150 m)-2), and Echinometra mathaei (14;0 ind(150 m)-2), The independent t test with SPSS
significant value of 5 % t table = 2.776 > t calculated = -2.319. Therefore, Ho was accepted that there is a significant difference of
the echinoidea on the coral reefs and seagrass beds.

Keywords : Echinoideas; Coral Reef; Seagrass, Pancuran Belakang and Karimunjawa