Penelitian dilakukan di Desa Raya, Kecamatan Berastagi, Kabupaten Karo, Sumatera Utara dan di Laboratorium Sistematika Hewan Depatermen Biologi, Universitas Sumatera Utara, Medan pada bulan januari - februari 2013. Penelitian dilakukan secara purposive random sampling dengan menggunakan metode kuadrat dan hand sorting. Hasil penelitian ditemukan 1 spesies famili Glocossicidae (P. corethrurus) dan 3 spesies famili Megascolidae (Amynthas sp., Megascolex sp. dan Pheretima sp.). Kepadatan cacing tanah pada pertanian organik (128,000 ind/m2) dan anorganik (73,600 ind/m2). Ada perbedaan komposisi komunitas cacing tanah pada lahan pertanian organik (Pheretima sp. 50,833%, P. corethrurus 40,000%, Amynthas sp. 7,500%, Megascolex sp. 1,667%) dan anorganik (P. corethrurus 49,275%, Pheretima sp. 46,377%, Amynthas sp. 4,384%). P. corethrurus dan Pheretima sp. merupakan jenis cacing tanah yang karakteristik pada lahan pertanian organik dan anorganik. Kata Kunci: Anorganik, Cacing Tanah, Kabupaten Karo, Komunitas dan Organik ABSTRACT This study had been done in Raya subdistrict, Berastagi district, Karo, Sumatera Utara in Animal Systematics Laboratory of Biology Department University of Sumatera Utara on January to February 2013. The sample for this study taken by purposive random sampling using the least squares and hand sorting method. The results of the research found that there were one family of Glocossicidae (namely species P. corethrurus) and 3 species of family Megascolidae (namely: Amynthas sp., Megascolex sp., and Pheretima sp.). The density of eartworm in organic farming was 128,000 ind/m2 and in inorganic one was 73,600 ind/m2. There were differences in community composition of earthworms on organic farms, they were Pheretima sp. 50,833%, P. corethrurus 40,000%, Amynthas sp. 7,500%, Megascolex sp. 1,667%, meanwhile, in inorganic farms were P. corethrurus 49,275%, Pheretima sp. 46,377%, Amynthas sp. 4,348%. P. corethrurus and Pheretima sp. were the characteristic of earthworms species in organic and inorganic agricultural land. Keywords: Community, Earthworms, Inorganic and Organic
Shorebirds are bird group that depend on coastal area which classified into two family, Charadriidae and Scolopacidae. Pantai Baru which lies in Deli Serdang Regency is occupied by the shorebirds as stop over area before continue the migration. This area then established as Important Bird Area (IBA) due to its ecological function for the migratory bird. The wetland type of this area are consisted of ponds, mangroves, and mudflat that occupied by shorebirds both for feeding and resting area. This study aimed to analyze the diversity and potential food of shorebirds Pantai Baru area. Concentration count method and Corer methord were used to collect the shorebirds and macrozoobenthos data. The study found 19 species of shorebirds and 21 species of macrozoobenthos. The diversity index of shorebirds ranged from 1.89 to 2.50 on medium category with the evenness index ranged from 0.84 to 0.97 with high category, while diversity index of macrozoobenthos was 1.09 on medium category with evenness index 0.36 on small category.
A study on the community structure of sandpipers (Charadriiformes: Scolopacidae) has been conducted from February to March 2014. Scolopacidae is a large family of shorebirds inhabiting the mudflat of Percut Sei Tuan district. The site was also documented as a transitory habitat during migration in each year during September and April. The aim of this study was to obtain the community structure and population of Scolopacidae species in the area. The method used to calculate the shorebirds was the concentration count and block method to estimate the number of population. The study documented 16 species and 2573 individuals, all dispersed within three sub-sites namely Bagan Percut, Pematang Lalang, and Tanjung Rejo. The total Shannon’s diversity index (H’) was obtained lower (1.672) in this study than the previous report in 2012 (1.865). The species, Numenius madagascariensis was the dominant population with a number of 1,156 individuals.
The occurrence of shorebirds is strongly influenced by environmental factors, especially food availability. Shorebirds are closely linked to their habitat conditions, so they seek out feeding sites according to their life cycle. Coastal conditions that have changed due to human activities may affect the assemblage of shorebird community. The aim of this study is to determine the diversity of shorebird species and the factors that influence them. Bird observations were made for three days using the point count method while the number of individuals was estimated by using “block method”. The results revealed 17 shorebird species from the families, Charadriidae, Scolopacidae and Sternidae. The dominant species were Charadrius mongolus, Pluvialis fulva and Sterna hirundo. The number of species in the morning observations was higher than in the afternoon. The diversity index for migratory birds ranges from 1.16 to 1.96, which is relatively low. This study showed that mudflats in Bagan Serdang Beach, Pantai Labu District is occupied by shorebirds in this region.
Cormorant is one of waterbirds which inhabit Tanjung Rejo mangrove as breeding site and feeding ground. This research is aimed to obtain economic potential of cormorant eggs as an alternative source of animal protein to coastal communities with limited economic efforts. The research was conducted during February to May 2018. Observation of cormorant nest was focused on 5 nests. Observations were conducted every two days from the first egg laying until nestlings, consisted of breeding season, clucth size, and egg morphology. Data were analyzed descriptively using MS. Excel. The results showed that the breeding season of cormorant occurred in two periods: February to May and August to December. The clutch sizes ranged from 1 to 4 eggs. Egg-laying varied on 2 to 4 d of interval and incubation began after the first egg laying. The eggs hatched after being incubated for 21-25 d. In conclusion, the eggs are one of the most important cycle for breeding succes of cormorant.
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