CD Skripsi
Sebaran Dan Karakteristik Mikrohabitat Kepiting Biola (Ocypodidae) Di Lingkungan Intertidal Pulau Bengkalis, Riau
Fiddler crab is a burrowing fauna that have important ecological role in the intertidal
ecosystem, such as keystone biota and ecosystem engineer. The diverse
characteristics and conditions of the intertidal flats are thought to cause differences in
distribution and microhabitats preference of fiddler crabs species. Bengkalis Islands
have different habitat characteristic and conditions of intertidal flats, especially from
mangrove vegetation cover and soil characteristics. This study aims to reveal the
fiddler crabs spesies, distributions, and their abundance in different habitat types,
characteristic of their microhabitat, and indicate the correlation between species and
environtment charachteristics of their microhabitat. Crabs and environtment factors
observation were conducted in six 1 m x1 m plots at higher, middle, and lower
subzone of three habitat types. Austruca annulipes, Austruca perplexa, and Tubuca
rosea were found in this study. The most abundant species was A. annulipes (76
burrows/m2), whereas A. perplexa and T. rosea were only 5 burrows/m2 each. A.
annulipes can be found in the middle subzone of open sandy coast and the lower
subzone of all three habitat types, A. perplexa was found in the lower subzone of
natural mangrove coast, and T. rosea was found in the middle subzone of mangrove
restoration coast. Cannonical correspondence analysis (CCA) indicates that A.
annulipes has more flexible microhabitat preference than A. perplexa which
correlated to soil bulk density and salinity, and T. rosea was correlated to mangrove
trees coverage. In concusions, the influence of vegetation coverage and soil
characteristics on the selection of fiddler crab microhabitat was relative to different
species.
Keywords: Bengkalis island, distribution, fiddler crab, intertidal flat, microhabitat
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