Retno Hartati

Similarity microalgal epiphyte composition on seagrass of Enhalus acoroides and Thalasia hemprichii from different waters

The epiphytes are all autotrophic organisms that are permanently attached to rhizomes, roots, and leaves of seagrasses. The epiphyte is an important primary producer for the seagrass ecosystem and contributes significantly to the food chain. This study aims to identify the composition of microepiphyte algae on Enhalus acoroides and Thalassia hemprichii and their similarity levels of both compositions. The 20 leaves samples of E. acoroides and T. hemprichii were observed. The epiphytic microalgae which found on the surface of the seagrass leaves were scrapped, collected in a bottle sample, and fixed with 70 % alcohol and identified into genera. The relation of epiphytic microalgal genera to the location and species of seagrass was analyzed using similarity analysis. The Chrysophyta, Cyanophyta, and Chlorophyta epiphytic microalgal were found. There were similarity variations of the microalgal epiphyte in seagrass of E. acoroides and T. hemprichii and seagrass habitat sites. Morphology and seagrass life affects the abundance and diversity of the epiphytic microalgal attached to the seagrass and it may be associated with the epiphytic lifetime in the seagrass.

The application of Environmental Friendly Technique For Seagrass Transplantation

Many attempts have been made to solve tremendous seagrass losses the marine environment in many area in the world. Artificial transplanting of shoots and spreading of seeds from intact meadows to non-vegetated coastal sediment are the most applied techniques. The study was aimed to apply environmentally seagrass tranplantation techniques in less vegetated area. Frame and small tube made from bamboo were used to do seagrass tranplantation in Jepara Waters. Vegetative shoots (springs) of Enhalus acoroides dan Cymodocea serrulata were collected from a healthy donor bed located nearby the transplantation site, and planted into unvegetated areas. Test transplant survival was assessed every month for three months. The result revealed that the survival rates of transplants were varied with the area. It might have due to difference in sediment characteristics of transplanting sites and transplant technique are discussed.

Re-Deskripsi Teripang Stichopus hermanii Dari Kepulauan Karimunjawa Melalui Analisa Morfologi, Anatomi Dan Spikula (Ossicles)

Holothuroidea atau yang lebih dikenal dengan sebutan teripang laut atau timun laut merupakan salah satu kelas dari Echinodermata. Penampakan morfologi teripang yang hampir mirip satu dengan yang lain mengakibatkan sering terjadi kekeliruan. Penelitian ini bertujuan untuk mengkaji lebih jauh tentang identifikasi Stichopus hermanii berdasarkan morfologi, anatomi serta bentuk dan komposisi spikula yang terdapat pada teripang Stichopus hermanii. Hasil pengamatan morfologi berdasarkan bentuk, corak dan warna serta tipe spikula menunjukkan bahwa Stichopus hermanii berwarna teripang berukuran besar dengan panjang mencapai 50 cm. Teripang ini berwarna kuning-kecoklatan dan pada papila kecil terdapat bercak keabu-abuan di seluruh permukaan tubuh dan bagian dorsal yang berbuku-buku. Bentuk dan komposisi spikula didominasi oleh bentuk roset dan meja dengan bentuk kaki empat. Kata kunci : teripang, Stichopus hermanii, re-deskripsi, morfologi, anatomi, spikula (ossicle) Holothuroidea well-known as sea cucumbers is one class of Echinoderm. Morphology of sea cucumbers are almost similar to each other resulting in frequent error of identification. This study aims to re-describe of Stichopus hermanii based its on morphology, anatomy and the form and composition of the spicules. Results of morphological description based on shape, pattern and color as well as the type of spicules shows that Stichopus hermanii has yelow brownish color. The shape and composition of the spicules is dominated by a rosette shape and a table with four legs form. Keywords : teripang, Stichopus hermanii, re-description, morphology, anatomy, spicule (ossicle)