Biology

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Browsing Biology by Subject "Abundance"

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    DISTRIBUSI DAN KELIMPAHAN KOMUNITAS GASTROPODA PADA EKOSISTEM HUTAN MANGROVE DI KECAMATAN MERBAU KABUPATEN KEPULAUAN MERANTI
    (2016-01-28) Maharani, Dewi; Gunawan, Haris; Titrawani
    Mangrove is a habitat for many species of flora and fauna one of them, is the gastropods. Changes in ecosystem condition is thought to affect the existence of species of gastropods. This study aims to determine the distribution and abundance of gastropod communities and analyze the effect of different mangrove zonation on the distribution and abundance of Gastropods communities in two different locations. This study was conducted from November to December 2014 in two different mangrove areas, ie. natural mangrove and rehabilitation-mangrove area, of Merbau District, Meranti Islands Regency. The method used in this research was survey method. Sampling was conducted only one period, during low tide, using 10m x 10m plot which includes five 1m x 1m subplot. There were 6 and 5 families of Gastropod species found in the natural mangrove and rehabilitation-mangrove area of Merbau District. Analysis data showed that the distribution of gastropods for both observation stations was spreading evenly. Gastropod species richness was highest on the first zonation (Avicennia spp.) with the abundance of Cerithidea obtusa 74 ind. / m2 and the lowest in the second zonation (Rhizophora spp.) with the abundance of Nerita furniculata 0.6 ind / m2. The test of 2 x 3 contingency showed the presence of a significant effect on the distribution and abundance of gastropods.
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    KELIMPAHAN MEIOFAUNA DI KAWASAN MANGROVE DESA BASILAM BARU DUMAI, PROVINSI RIAU
    (2013-07-16) Neri, Elfi; Mahatma, Radith; Khairijon
    The information of meiofauna abundance from Indonesia mangrove is still scarce. This research aimed to know the abundance of meiofauna from mangrove area in Basilam Baru village. Samples were collected using corer from sediment that dominated four different mangrove vegetations i.e. Rhizopora apiculata, Xylocarpus granatum, sonneratia alba and Avicennia alba. A total of 4144 meiofauna which consisted of Copepoda, Nematoda, Nemertina, Olygochaeta, Ostracoda, Polichaeta and Thermosbaenacea were found in this study. The total of meiofauna abundance that found in mangrove area of Basilam Baru village was 682,03 ind/10cm2. The average abundance of meiofauna within the four different mangrove vegetations was significantly different (P<0,05). The most dominant meiofauna was Nematode followed by Copepode. The highest abundance of meiofauna was found around Avicennia alba and the lowest abundance was found around Xylocarpus granatum.
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    STRUKTUR KOMUNITAS MAKROFAUNA DI KAWASAN MANGROVE DESA TANJUNG LEBAN DAN BUKIT BATU, KABUPATEN BENGKALIS
    (2016-01-28) Afrimaini; Mahatma, Radith; Khairijon
    Information on community structure of macrofauna in Indonesian mangrove areas is still limited. The aimed of this research was to assess the community structure and abundance of macrofauna in Tanjung Leban and Bukit Batu, Bengkalis Regency. Sampling of macrofauna was conducted on September 2014. Samples ware collected using corer in 10 plots for each mangrove area with 3 replications on each plot. The result showed that the macrofauna composition was about 1277 individuals consisted of taxa namely Nematoda, Gastropoda, Copepoda, Bivalva, Polychaeta, Oligochaeta, Tardigrada, Insecta, Holothuroidea, Ostracoda dan Syncarida. The total abundance of macrofauna was3347,49 ind/m2. Macrofauna taxa which most dominant in this area research were Nematoda, Gastropoda and Copepoda. ANOVA analysis on each plots showed the result was not significantly different (Tanjung Leban Fhit=0,96; P>0,05, Bukit Batu Fhit=0,86 P>0,05). Test-t analysis on the average abundance of macrofauna between these two mangrove areas wasalso not significantly different (P>0,05).