Munasik, Munasik (2016) Composition of Juvenile Corals in Different Morphotypes of Substrate at Karimunjawa Archipelago, Indonesia. ILMU KELAUTAN Undip.

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Abstract

Patterns of coral recruitment are partially explained by fitness consequences of substrate selection, and may be
affected by substrate morphology. This study examined juvenile coral assemblages on morphologically different
dead coral substrate in shallow water reefs (4-5 m) at Karimunjawa Island, Java Sea (Indonesia). Surveys on
juvenile corals were performed using 0.5×0.5 m transects on two different morphotypes of natural substrate;
tabular dead corals (stable) and branching dead corals (unstable). Results showed that the morphological
characteristics of dead coral substrate had a significant influence on the generic composition of juvenile corals.
Coral recruits on tabular dead coral substrate (stable) which composed micro-cervices was more diverse than on
branching dead coral substrate (unstable). Juvenile corals of the genus Acropora were dominant on (exposed
microhabitats of) tabular dead coral substrate, while those of the genus Fungia and Montipora were dominant on
(cryptic microhabitats of) branching dead coral substrate. These results suggest that Acroporid juveniles can be
settled to the various morphotype of the substrate, thus the distribution pattern of juvenile corals in shallow reef
Karimunjawa maybe correlated with the distribution pattern of natural substrates.

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