| Abstrak/Abstract |
Crabs has been known inhabiting diverse habitat. Crabs were found in the sea, and some otherspecies were found in terrestrial or freshwater. Crabs is one of the important biotic components ofthe aquatic ecosystem as detrivore. Opak River is one of the major rivers in the Daerah IstimewaYogyakarta (DIY), which has a various conditions and direct impact on biodiversity including thediversity of crabs. Up to now, there is no database of crab species from Yogyakarta. The aim of thisresearch was to determine the diversity of crabs from Opak River. Research were carried out for 5months between June and October 2013. Samples were characterized and identifiedmorphologically. The results show that there are five species of crabs in Opak River. Parathelphusaconvexa (De Man, 1879) was commonly found from upstream to downstream. Varuna litterata(Fabricius, 1798) was found in downstream to estuary (brackish water). The other three specieswere only found in the estuary area viz. Ocypode ceratophthalma (Pallas, 1772), Episesarmaversicolor (Tweedie, 1940), and Scylla serrata (Forsskål, 1775). It can be concluded that diversityof crabs in the Opak River estuary area is higher than the upstream and downstream areas. |
