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Udhi Eko Hernawan, Udhi Eko

UPT Loka Konservasi Biota Laut Tual, Lembaga Ilmu Pengetahuan Indonesia

Author-ID : 507614

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Immunology & microbiology Veterinary

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SEAGRASS POPULATION CONNECTIVITY IN THE SOUTH CHINA SEA Hernawan, Udhi Eko
Marine Research in Indonesia Vol 43, No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Seagrass plays important ecological roles and ecosystem services, yet degrading alarmingly in the South China Sea (SCS), one of the largest marginal seas of the Western Pacific. As connectivity is a vital component in population persistence, understanding of connectivity is of importance for effective seagrass conservation management. In the South China Sea, our understanding of connectivity is mainly based on studies in fishes and invertebrates. Connectivity in seagrass populations, on the other hand, is still poorly investigated. In this review, I predict that genetically structured population of seagrass is likely to occur in the SCS. Future research on seagrass connectivity should include (i) investigation on the pattern of connectivity at a local and broader-regional scale, and (ii) investigation on processes involved in the seagrass connectivity. These investigations are aimed to improve our knowledge of seagrass connectivity and to contribute in providing a solid framework for seagrass restoration/transplantation and spatial planning of seagrass management.

SEAGRASS POPULATION CONNECTIVITY IN THE SOUTH CHINA SEA Hernawan, Udhi Eko
Marine Research in Indonesia Vol 43 No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Seagrass plays important ecological roles and ecosystem services, yet degrading alarmingly in the South China Sea (SCS), one of the largest marginal seas of the Western Pacific. As connectivity is a vital component in population persistence, understanding of connectivity is of importance for effective seagrass conservation management. In the South China Sea, our understanding of connectivity is mainly based on studies in fishes and invertebrates. Connectivity in seagrass populations, on the other hand, is still poorly investigated. In this review, I predict that genetically structured population of seagrass is likely to occur in the SCS. Future research on seagrass connectivity should include (i) investigation on the pattern of connectivity at a local and broader-regional scale, and (ii) investigation on processes involved in the seagrass connectivity. These investigations are aimed to improve our knowledge of seagrass connectivity and to contribute in providing a solid framework for seagrass restoration/transplantation and spatial planning of seagrass management.

Reproductive Biology of the Freshwater Clam Pokea (Batissa violacea var. celebensis, von Marten 1897) (Bivalvia: Corbiculidae) in the Pohara River, Southeast Sulawesi, Indonesia Bahtiar, Bahtiar; Anadi, La; Nurgayah, Wa; Hamzah, Muhaimin; Hernawan, Udhi Eko
BIOTROPIA Vol. 28 No. 1 (2021): BIOTROPIA Vol. 28 No. 1 April 2021
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.0.0.0.623

The freshwater clam, locally known as Pokea (Batissa riolacea var. celebensis, von Martens 1897; Bivalvia: Corbulidae), is a popular and widely consumed food in Kendari, Southeast Sulawesi. Despite its popularity, basic information required for conservation management, such as reproductive biology, is lacking. Hence, this study aims to examine the reproductive biology of the clam obtained from the Pohara River, Kendari, Southeast Sulawesi Province, Indonesia. Pokea samples were collected monthly from February 2012 to January 2013. Its reproductive biology, including sex ratio, stage of gonadal maturity, gonadosomatic index (GSI), fecundity, and size at first mature gonad for each sample, was recorded. Data were analyzed using the chi-square test and linear regression in the software package SigmaPlot v.6.0. The Pokea population in the Pohara River was male-biased. The population spawns throughout the year, with the peak spawning season occurring in August–September. Mature gonads were found at small shell sizes, indicating early sexual maturity. This gonadal development in Pokea, which might have been influenced by food availability, provides very relevant baseline information for the conservation of the Pokea population in the Pohara River.

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