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Direct Effects of Sea Urchins (Echinoderms) on Coral Reefs
Coral reef ecosystems are part of an important marine ecosystem because they are a
source of life for a wide variety of marine biota
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Sea urchins are found from the intertidal area to a depth of 10 meters and are true inhabitants
of the sea, with a tolerance limit of salinity between 30-34 ppt
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The
presence of sea urchins is very important, especially in the food web, because these
organisms are generally detritus eaters and predators
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Echinodermata mathaei is a type of
sea urchin that is only found in rock crevices or coral rubble
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setosum, which can be found in almost all areas, ranging from sand flats, seagrass beds, coral
flats, and cliffs, to rocky areas, Sea urchins play an important role in the ecosystem balance
of their habitat
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Sea urchins feed mostly on algae
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The decline in the population of sea urchins is thought to cause
the death of coral reefs because the macroalgae population will increase drastically, so that
the macroalgae will dominate and cover the corals
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Reducing the number of sea urchins as
herbivorous biota and increasing nutrients will result in an abundance of macroalgae
(blooming) and will certainly have a negative impact on coral life
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While macroalgae are competitors for coral
animals in fighting over space resources (sunlight), Other examples, such as the role of
Diadema antillarum for coral reefs, include the fact that an increase in the population of this
species results in the death of larvae or young corals
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The presence of Diadema antillarum populations is
important for coral reefs as a counterweight
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While the mass death of Diadema antillarum has resulted in a
significant decrease in coral cover, algae can also dominate coral reefs
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Sea urchins will damage the
environment without macroalgae and faunal associations
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Each increase in the percentage

of coral reef cover in the intertidal area will be followed by an increase in the density of sea
urchins
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The mass death of sea urchins has resulted in a drastic reduction in
live coral cover
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, A
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Irawan
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Hubungan antara bulu babi, makroalgae dan
karang di perairan daerah Pulau Pucung
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Sari, T
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, A
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As-syakur
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Suteja dan D
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Wiyanto
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Hubungan kepadatan bulu
babi (Echinoidea) dan tutupan terumbu karang pada kawasan intertidal Pantai
Sanur
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3(2): 134-141

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