Sand dollars distribution pattern and abundance at the coast of Cemara Kecil Island, Karimunjawa, Jepara, Indonesia

Abstract

This research is aimed to know the distribution patterns and abundance of sand dollars [Clypeaster subdepressus (Gray, 1840)] at different spatial distances from the coast of Cemara Kecil Island Karimunjawa, Indonesia. The data were collected using purposive sampling and analyzed using cluster analysis PAST-3. The results indicate that the abundance of sand dollar amounts to 2 200 individuals, and the existing species are Laganum centrale, L. laganum, L. fudsiyama, L. depressum, L. retinens, L. boschi, L. depressum tonganense, L dickersoni, L. decagonale rectum, L. joubini and L. decagonale. The cluster analysis using PAST-3 reveals that there are clumped distributions and uniform distributions of L. centrale and Laganum laganum. At a distance of 23 m to 38 m from the coastline the animals form clumped distributions.