IDENTIFIKASI JENIS KEPITING BIOLA DI HUTAN MANGROVE DUSUN SETINGGA ASINDESA SEBUBUS KECAMATAN PALOH KABUPATEN SAMBAS

The fiddler crab is also known as the kepiting biola is an animal that has broad legs that belong to the Crustacean class. Fiddler crab is a type of crab that has a habitat in intertidal areas, especially around mangrove forests and sandy beaches. This study aims to examine the identification of fiddler crab species found in the Mangrove Sebubus. The method used in this research is purposive sampling method with the use of a square plot size of 1 x 1 meter as many as 30 pieces in 3 research lines. The results showed as many as 7 species of fiddler crabs found there, that is Uca annulipes, Uca rosea, Uca forcipata, Uca bellator, Uca tetragonon, Uca paradussumieri, and Uca acuta.Keywords: Identification, Fiddler Crab, Mangrove Sebubus

JENIS-JENIS CRUSTACEA DI CAGAR ALAM TELUK KLOWE PULAU ENGGANO KABUPATEN BENGKULU UTARA

Mangrove forest in Cagar Alam of Klowe Bay is one of the conservation forest on Enggano Island. Mangroves for serving as an ecological function that can keep from coastal abrasion. Mangroves can also be used as a habitat for water biota, one of which is crustaceans. The aim of this research is identification the types of Crustaceans in Klowe Bay Cagar Alam, Kahyapu Village, Enggano Island, North Bengkulu Regency. This research was conducted in January 2018 with exploration methods and the data were analyzed by descriptive qualitative. Based on theresults of the study, obtained 13 species, with the most genera found in Uca. The species found consist of Coenobita violascens, Uca annulipes, Uca boninensis, Uca crassipes, Uca dussumeiri, Uca tetragonon, Uca

KEANEKARAGAMAN KEPITING BIOLA DI KAWASAN MANGROVE KABUPATEN PURWOREJO, JAWA TENGAH

Mangrove merupakan ekosistem yang khas dan memiliki fungsi penting secara ekologi, sosial-ekonomi, dan pendidikan. Luas kawasan mangrove di Kabupaten Purworejo semakin berkurang akibat adanya penebangan, permukiman, tambak,dan pertanian. Berkurangnya tegakan mangrove akan mempengaruhi keberadaan berbagai fauna yang berasosiasi dengannya. Oleh karena itu dilakukan pada bulan Agustus-September 2016 untuk mengetahui keanekaragaman kepiting biola di kawasan mangrove Kabupaten Purworejo, Jawa Tengah. Ada tiga stasiun, yaitu mangrove lebat (Desa Gedangan), mangrove sedang (Desa Jatikontal), dan mangrove jarang (Desa Ngentak). Dari penelitian didapatkan 7 jenis kepiting biola, yaitu Uca annulipes, U.crassipes, U.paradussumieri, U.rosea, U.tetragonon, U.vocans, dan U.vomeris. Indeks keanekaragaman kepiting biola di kawasan mangrove Kabupaten Purworejo, Jawa Tengah pada stasiun 1 (1,67)dan stasiun 2 (1,90) tergolong sedang. Adapun indeks keanekaragaman kepiting biola di stasiun 3 (0,64) tergolong rendah. Kondisi lingkungan di seluruh stasiun relatif baik untuk kehidupan mangrove dan kepiting biola, yaitu suhu26-30°C, pH 6-8, oksigen terlarut 3,5-6,6 mg/L, salinitas 3-9 ppt, dan substrat lumpur berpasir. Vegetasi mangrove pada stasiun I adalah Rhizophora mucronata, Nypa fruticans, Sonneratia alba, dan Hibiscus tiliaceus. Vegetasi mangrovepada stasiun II adalah Sonneratia caseolaris, Rhizophora stylosa, N.fruticans, H.tiliaceus, dan Morinda citrifolia.Vegetasi mangrove pada stasiun III adalah S.alba, S.caseolaris, N.fruticans, dan R.mucronata. Kerapatan vegetasi mangroveberkaitan dengan kelimpahan jenis (kepadatan) kepiting biola.

Kelimpahan Relatif dan Preferensi Habitat pada Kepiting Mangrove (Uca spp.) di Kabonga Kecil, Donggala, Sulawesi Tengah

Penelitian ini bertujuan untuk mengetahui kelimpahan relatif dan preferensi habitat kepiting mangrove Famili Ocypodidae (Uca spp.)di zona intertidal di Kabonga Kecil, Donggala, Sulawesi Tengah. Koleksi sampel dilaksanakan pada bulan Januari 2017 menggunakan metode purposive sampling pada 4 stasiun. Hasil penelitian menunjukkan terdapat 6 spesies kepiting genus Uca di Kabonga Kecil yaitu Uca annulipes,U. triangularis, U. perplexa, U. dussumieri, U. demani, dan U. vocans yang tersebar pada 3 tipe habitat yaitu substrat berlumpur, substrat berpasir dan substrat pasirberlumpur.Kelimpahan dari masing-masing spesies adalah U. dussumieri 75%; U. demani100%; U. demani 68,67%; dan 4: U. dussumieri 67,65% berturut-turut dari stasiun 1 sampai 4. Hutan mangrove di Kabonga Kecil memiliki suhu substrat yang berkisar antara 26ºC ‒ 30ºC sedangkan pH berkisar antara 5,0% ‒ 6,1%.

Komunitas Krustasea di Kawasan Mangrove Desa Jangkaran Kabupaten Kulon Progo

The objective of this study was to determine the diversity and abundance of krustaseans in the mangrove area of Jangkaran Village, Temon District, Kulon Progo Regency. Sampling was done bi-weekly from October 2016 to February 2017 on six stations defined by ecological character. Krustasean sampling was done using cest net, trap net and hand picking along the river with the extent of each collection station about 10 m2. The captured krustasean samples were cleaned, stored in ice-cooled boxes and transported to the laboratories to be identified and grouped according to species, then measured by carapace length and individual weight. Observation of aquatic environment was done by measuring temperature, brightness, water depth, current velocity, pH, salinity, dissolved oxygen, and substrate type. The results of the observation obtained 1 order, 7 families, and 26 species. The family krustaseans found were Coenobitidae, Diogenidae, Grapsidae, Ocypodidae, Palaemonoidae, Penaeidae, and Portunidae. The most dominant species of krustaseans were white shrimp (Penaeus merguiensis) as much as 25.06%, hermit crab (Clibanarius sp.) as much as 10.85%, and Uca annulipes as much as 10.59%. The fewest species of krustaseans found were Varuna yui of 0.13% and Ocypode sp. as much as 0.26%. The abundance value was 25.4 ind / m2, indices of diversity 2.60, richess index 0.87 and index of dominance 0.18.

Burrow excavation and mudballing behaviour of the fiddler crab Uca annulipes (H. Milne Edwards, 1837) from southern Thailand

We video-recorded and examined the burrow building behaviour of small and large males and females ofUca annulipes(H. Milne Edwards, 1837). Males took a longer time than females, and larger crabs took a longer time than smaller ones, to build burrows. Higher numbers of mudballs were excavated from inside the burrows during the build of the burrows by males than by females, and by larger crabs than by smaller ones. Crab carapace width was positively correlated with the time required to build burrows, and with the number of mudballs excavated from inside the burrows during the build of these burrows. We observed that 82% of the females placed the mudballs near their burrow entrance, whereas 85% of the males placed the mudballs far from their burrow entrance. After building the burrows, 71% of the females went inside the burrow and plugged the burrow entrance, and 90% of the males foraged for food.

High motivation enables smaller contestants to win the contests in fiddler crabs (Brachyura, Ocypodidae)

We observed the outcomes of fights of smaller contestants against larger opponents during male-male contests in Uca annulipes (H. Milne Edwards, 1837), Uca bengali Crane, 1975, and Uca rosea (Tweedie, 1937). Smaller contestants won 30, 31 and 37% of the contests in U. annulipes, U. bengali and U. rosea, respectively, regardless of body size disadvantages. Smaller contestants won when body size asymmetries were lesser, but took a longer time to win the contests, while with greater size-asymmetries, smaller ones lost the contests in a short time. In U. bengali and U. rosea, most of the smaller winners were residents (burrow owners), but not in U. annulipes. This study shows that longer fighting duration or high motivation enables the smaller contestants, especially the residents, to overcome their inferior fighting ability and win contests against larger opponents.