scholarly journals INVENTARISASI JENIS BULU BABI (Echinoedea) DI ZONA PASANG SURUT PANTAI DESA BUKAAN KECAMATAN LAKEA KABUPATEN BUOL

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Suardi Laheng
Keyword(s):  
Echinometra Mathaei

Penelitian ini bertujuan untuk mengetahui jenis bulu babi yang terdapat di zona pasang surut pantai Desa Bukaan Kecamatan Lakea Kabupaten Buol. Penelitian ini menggunakan tiga titik stasiun pengamatan yang masing-masing stasiun terdapat 3 transek line dan setiap transek terdapat 5 plot yang berukuran 1x1 meter. Hasil penelitian menunjukkan terdapat tiga jenis bulu babi di zona pasang surut pantai Desa Bukaan yaitu Echinometra mathaei, Deadema setosum dan Stomopneustes variolaris. Kata kunci : Inventarisasi, bulu babi, pasang surut

Feeding behaviour and bioerosion: the ecological role of the rock-boring urchin, Echinometra mathaei (de Blainville, 1825), in Okinawa reef flat

2013 ◽  
Vol 1 (1) ◽  
pp. 10
Author(s):  
Noar Muda Satyawan ◽  
Shelly Tutupoho ◽  
Yusli Wardiatno ◽  
Makoto Tsuchiya
Keyword(s):  
Feeding Behaviour ◽  
Reef Flat ◽  
Type A ◽  
Gut Contents ◽  
Biological Processes ◽  
Type B ◽  
Night Time ◽  
Echinometra Mathaei ◽  
Benthic Ecosystems

Erosion rate on corals due to activities of other biota is called bioerosion. The rock-boring urchin, Echinometra mathaei, when it is abundant, plays a significant role in benthic ecosystems, including biological processes like coral erosion. During feeding, E. mathaei erodes calcium carbonate besides grazing on algae living on coral, so it plays an important role in both organic and inorganic carbons in coral reefs. The urchin E. mathaei actively feeds during the night time (nocturnal grazer). Although in Okinawa four types (A-D) of the urchin exist, the research only focused on the types A and B. Type A of E. mathaei produced 0.44951 g feces per day on average while type B produced 0.38030 g feces per day. CaCO3 analysis in feces and gut contents showed bioerosion rate of E. mathaei type A was 0.64492 g/individu/day, and 0.54436 g/individu/day in type B. There were no significant differences in bioerosion impact of E. mathaei type A and B© Laju erosi pada karang yang disebabkan oleh biota, dikenal dengan bioerosi. Bulu babi jenis Echinometra mathaei, ketika melimpah, menjadi sangat berpengaruh terhadap ekosistem bentik termasuk proses biologi seperti erosi karang. Selama aktivitas makan, E. mathaei menggerus kalsium karbonat dalam proporsi yang besar di samping alga yang tumbuh menempel pada karang sehingga memiliki peran penting dalam siklus karbon organik dan anorganik di ekosistem terumbu karang. Bulu babi E. mathaei aktif mencari makan pada malam hari (nocturnal grazer). Meskipun di Okinanawa ada 4 tipe (A-D), pada eksperimen kali ini memfokuskan pada tipe A dan B saja. Tipe A E. mathaei rata-rata memproduksi 0,44951 g feses/hari dan tipe B memproduksi 0,38030 g feses/hari. Berdasarkan analisis CaCO3 yang dilakukan pada feses dan isi lambung, laju bioerosi yang disebabkan oleh E. mathaei tipe A sebesar 0,64492 g/individu/hari sedangkan tipe B sebesar 0,54436 g/individu/hari. Tidak terdapat perbedaan dampak bioerosi yang signifikan antara E. mathaei tipe A dan B©

Reproduction of the sea urchins Echinometra mathaei and Diadema savignyi on the South African eastern coast

1995 ◽  
Vol 46 (4) ◽  
pp. 751 ◽  
Author(s):  
AE Drummond
Keyword(s):  
South African ◽  
Sea Urchins ◽  
Gonad Index ◽  
Extended Period ◽  
Eastern Coast ◽  
The South ◽  
Annual Cycles ◽  
Echinometra Mathaei ◽  
Reproductive Cycles

The reproductive cycles of Echinometra mathaei and Diadema savignyi on the South African eastern coast were investigated by means of gonad index and histological methods. Both species showed annual cycles, with spawning occurring during the summer months (December to March-April), but the degree of gametogenic synchrony differed markedly between the two species. In D. savignyi, gametogenesis within and between sexes was in close synchrony and there was evidence suggesting that repeated spawning with a monthly rhythm occurred. In contrast, gametogenesis in E. mathaei was poorly synchronized and spawning occurred over an extended period.

scholarly journals Actuopaleontological investigations of shallow water Red Sea echinoids

1992 ◽  
Vol 6 ◽  
pp. 220-220
Author(s):  
James H. Nebelsick
Keyword(s):  
Grain Size ◽  
Red Sea ◽  
Distribution Patterns ◽  
Close Correlation ◽  
Time Averaging ◽  
Multivariate Statistical ◽  
Cryptic Habitats ◽  
Echinometra Mathaei ◽  
Grain Size Parameters ◽  
Diadema Setosum

The regular and irregular echinoid fauna of the Northern Bay of Safaga (Red Sea, Egypt) has been investigated within the framework of an actuopaleontological study of the flora, fauna, sediments and facies. The distribution of echinoids has been compared to grain size parameters as well as to the distribution of other organisms.The study area (ca. 10 × 7 km) was investigated using SCUBA-diving techniques along 55 transects with a total length of 126 km. Echinoid presence was quantified using weights of fragments (2 mm) originating from 67 standardized bulk samples distributed throughout the Bay. The complex morphology of the echinoid test and the spines allow the identification of fragmented material upon comparison to complete specimens. The resulting data was analyzed using correlation techniques as well as Q and R-mode multivariate statistical analysis. This method counters the difficulties originating from the cryptic habitats and patchy distributions.The results of the analysis show that echinoid distribution can be analyzed for both regular and irregular wchinoid taxa despite taphonomic bias and restrictions imposed by the analytic method. Time averaging in fact counters the difficulties arising from the patchy distributions of echinoids. There is a close correlation of echinoid distribution to sedimentary and bottom facies as well as to grain size parameters and other environmental factors. The distribution of irregular echinoids is highly differentiated with coarse coastal sand dominated by Clypeaster sp., Echinodiscus auritus, Fibularia ovulum, and Lovenia elongata; muddy sands by Laganum depressum, Clypeaster sp. and Echinocyamus crispus; and muds by members of the Schizasteridae. Regular echinoids, mostly Eucidaris metularia, Echinometra mathaei, Tripneustes gratilla, Heterocentrotus mammillatus and Diadema setosum, dominate the sediments found within, or near reefs, coral carpets and patch reefs.The methodology used in this actuopaleontological investigation should be useful in recognizing the distribution patterns of ancient echinoid faunas, especially in light of the significance of regular echinoids in the bioerosion of reefs and irregular echinoids in the bioturbation of sediments.

scholarly journals Impact Test Size and Type of Echinometra mathaei as Agent of Bioerosion on Reef Flat (Pengaruh Ukuran dan Tipe Echinometra mathaei pada Bioerosi Karang)

2014 ◽  
Vol 19 (2) ◽  
pp. 75 ◽  
Author(s):  
Cristiana Manullang ◽  
Makoto Tsuchiya ◽  
Ambariyanto Ambariyanto ◽  
Diah Permata
Keyword(s):  
Sea Urchin ◽  
Type Species ◽  
Reef Flat ◽  
Impact Test ◽  
Type A ◽  
Inorganic Materials ◽  
Type B ◽  
Gut Content ◽  
Test Size ◽  
Echinometra Mathaei

Bioerosi adalah aktivitas berbagai organisme yang menyebabkan terjadinya erosi dan kerusakan misalnya pada kalsium karbonat karang. Aktivitas ini merupakan faktor utama yang mempengaruhi morfologi terumbu karang. Bioerosi dipengaruhi oleh tiga variabel yakni jenis spesies, ukuran dan kelimpahan spesies tersebut. Tujuh puluh lima persen dari bioerosi disebabkan oleh landak laut. Perbedaan pada ukuran dan jenis landak laut memberikan dampak signifikan terhadap daerah yang terjadi bioerosi. Penelitian ini bertujuan untuk menguji pengaruh ukuran dan jenis landak laut E. mathaei (tipe A dan B) pada komposisi CaCO3 dalam isi usus dan tinja organisme tersebut sebagai agen bioersi. Landak laut yang digunakan diperoleh dari ekosistem karang di pantai Minatogawa, Okinawa-Jepang. Masing-masing tipe landak laut dibedakan berdasarkan ukuran ≥30 mm dan <30mm. Penelitian dilakukan dengan tiga ulangan. Pemeliharaan ini dilakukan di laboratorium dengan analisis komposisi CaCO3 pada tinja dan konten usus. Hasil penelitian membuktikan bahwa komposisi CaCO3 disebabkan karena aktivitas bioerosi harian dari E. mathaei. Landak laut dengan ukuran diameter ≥30 mm terbukti lebih aktif dibandingkan dengan diameter <30mm. Disamping itu landak laut tipe B lebih aktif dibandingkan tipe A dengan ukuran yang sama. Persentase CaCO3 dalam usus selama pemeliharaan di laboratorium adalah 73% dan sisa 27% berupa bahan organik dan anorganik. Bierosion harian E. mathaei tipe A ≥ 30 mm 166,70 mg.hari-1, tipe A <30 mm 77.78 mg.hari-1, tipe B ≥ 30 mm 126,30 mg.hari-1, tipe B <30 mm 116,17 mg.hari-1. Tingkat bioerosion harian E. mathaei dipengaruhi oleh jenis, spesies, kecepatan menggiling, dan ukuran landak laut. Kata kunci: ukuran; Echinometra mathaei; bioerosi; karang Bioerosion is an activity of various organisms such as erosion and destruction of coral calcium carbonate and become a major factor influencing coral reefs morphology. Bioerosion is influenced by three variables: type of species, size of species and abundance. Seventyfive percent of bioerosion caused by sea urchin. Differences on size and type of sea urchin gave a significant impact to the bioerosion area. This study aimed to examine the influence of the size and the type of sea urchin E. mathaei (type A and type B) on the composition of CaCO3 in the gut content and feces as bioersion agent on the reef flat in Minatogawa Coast, Okinawa-Japan. The organisms used were E. mathaei type A and type B with each type distinguished by size ≥ 30 mm and < 30 mm with three replications. The maintenance was carried out at laboratory for 3 days by observing analysis of the composition of CaCO3 on feces and gut content. It indicates that the composition of CaCO3 as daily bioerosion was caused by E. mathaei. The results showed E. mathaei with diameter ≥ 30 mm was more active than those with diameter of < 30mm and type B was more active than type A in each of the same size. Percentage of CaCO3 in the gut during maintenance in the laboratory was 73% and the other 27% consist of organic and inorganic materials. Daily bierosion E. mathaei type A ≥ 30 mm 166.70 mg.day-1 , type A < 30 mm 77.78 mg.day-1 , type B ≥ 30 mm 126.30 mg.day-1 , type B < 30 mm 116.17 mg.day-1. Daily bioerosion rate E. mathaei was influenced by the type, species, speed of grind, and the size of the sea urchin. Keywords: size; Echinometra mathaei; bioerosion; reef flat

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