BIODIVERSITY OF MACROALGAE IN COASTAL AREAS OF DRINI ,
YOGYAKARTA, INDONESIA
Zulfikar Achmad Tanjung*, Mei Ria Santi, Yeni Rahmawati,
and Eka Sunarwidhi Prasedya
Marine Study Club, Faculty of Biology, Gadjah Mada University, Yogyakarta
*E-mail : za_tanjung@yahoo.com
Abstract
A comprehensive investigation on macroalgae communities has been conducted in coastal areas of Drini, Yogyakarta on December 2009. Coastal areas of Drini has a unique ecosystem. It has seagrass bed (Thalasia hemprichii) beside seaweed bed. The objectives of the present study were to investigate the biodiversity and frequency of macroalgae species in this coast. Sample taken by combining quadrat plot and line transect (NaGISA protocol). The biodiversity comprised of 15 species from 15 genus and 10 family. In high tide Padina minor have the higest relative abundance that is 45.89% and also have the highest importance index (67.04). In mid tide Padina minor have the higest relative abundance that is 24.74%, and followed Borgesenia forbesii 23.81%, Chaetomorpha linum 15.56%, and Laurencia corallopsis 13.47%. The highest importance index in mid tide is Borgesenia forbesii (40.48). In low tide Laurencia corallopsis have the highest relative abundance that is 17.13%, and followed Chaetomorpha linum 16.15%, Padina minor 15.02%, Valonia aegagropila 13.20%, Borgesenia forbesii 12.5%, and Gellidiela sp. 10.53%. The highest importance index in low tide is Borgesenia forbesii (27.92). In 1 m depth, Borgesenia forbesii have the higest relative abundance that is 28.49%, and followed Laurencia corallopsis 23.65%, Chaetomorpha linum 23.47%, and Valonia aegagropila 13.08%. The highest importance index in 1 m depth is Borgesenia forbesii (49.64).
Key words: biodiversity, macroalgae, Drini, seagrass bed