scholarly journals VERTICAL DISTRIBUTION AND DENSITY OF CORAL FUNGIIDAE ON MALALAYANG WATERS

2013 ◽  
Vol 1 (1) ◽  
pp. 42
Author(s):  
Friska Mampuk ◽  
Hanny Tioho ◽  
Janny D. Kusen
Keyword(s):  
Vertical Distribution ◽  
Reef Flat ◽  
Reef Slope ◽  
Hard Substrate ◽  
Coral Recruitment ◽  
Free Living

Fungiidae known as a solitaire coral, attachment and also free living and has capability of individual move for migrate.  Their mobility allows them to expand the area, providing a hard substrate for coral recruitment and shelter for other invertebrates.  The objective of this study was to examine the density and distribution of fungiid corals in Malalayang waters. The data were collected from September to December 2012 at four different areas.  The results of this study showed that the highest density of fungiid corals were occurred on the front reef study site and mostly by Fungia danai (0,62 ind/m2), compared with other species such as Herpolitha limax (0,25 ind/m2), F. paumotensis (0,19 ind/m2), F. fungites (0,18 ind/m2), F. granulosa (0,18 ind/m2) and with an aggregated pattern of distribution.   Fungiid corals found in this study were mostly relatively more on the reef flat compared to the reef slope.

VERTICAL DISTRIBUTION AND DENSITY OF CORAL FUNGIIDAE ON MALALAYANG WATERS

2013 ◽  
Vol 1 (1) ◽  
pp. 42
Author(s):  
Friska Mampuk ◽  
Hanny Tioho ◽  
Janny D. Kusen
Keyword(s):  
Vertical Distribution ◽  
Reef Flat ◽  
Reef Slope ◽  
Hard Substrate ◽  
Coral Recruitment ◽  
Free Living

Fungiidae known as a solitaire coral, attachment and also free living and has capability of individual move for migrate.  Their mobility allows them to expand the area, providing a hard substrate for coral recruitment and shelter for other invertebrates.  The objective of this study was to examine the density and distribution of fungiid corals in Malalayang waters. The data were collected from September to December 2012 at four different areas.  The results of this study showed that the highest density of fungiid corals were occurred on the front reef study site and mostly by Fungia danai (0,62 ind/m2), compared with other species such as Herpolitha limax (0,25 ind/m2), F. paumotensis (0,19 ind/m2), F. fungites (0,18 ind/m2), F. granulosa (0,18 ind/m2) and with an aggregated pattern of distribution.   Fungiid corals found in this study were mostly relatively more on the reef flat compared to the reef slope.

scholarly journals HARD CORAL (SCLERACTINIA) RECRUITMENT BASED ON THE GEOMORPHOLOGY ZONE IN BINTAN ISLAND WATERS, RIAU ISLANDS

2021 ◽  
Vol 13 (2) ◽  
pp. 269-281
Author(s):  
Nurhasima ◽  
Aditya Hikmat Nugraha ◽  
Dedy Kurniawan
Keyword(s):  
Coral Reef ◽  
Reef Flat ◽  
Sampling Method ◽  
Life Form ◽  
T Test ◽  
Reef Slope ◽  
Hard Coral ◽  
Coral Recruitment ◽  
Line Parallel ◽  
Coral Reef Ecosystems

The health of coral reef ecosystems can be seen through the emergence of coral recruitment. Aim of this research was to compared the scleractinia coral recruitment list based on genus, life form, and variations in size of the scleractinia coral recuit in the waters of Kampung Baru Lagoi and Teluk Bakau Village, Bintan Regency by geomorfology zone. The research was conducted using a Purposive sampling method in consideration of the presence of scleractinia coral in reef flat and reef slope areas using a 1x1 m square frame mounted along a 70 m transverse line parallel to the shoreline. Research has found 164 colonies of 24 genus dominated by Favia and Favites. Based on the most extensive life form of Coral encrusting and Coral massive variations in size 4.5-6 cm or medium category. The results of t test showed that the geomorphological differences in the research locations did not have a significant impact on the abundance of corals recruitment

scholarly journals Pair formation, home range, and spatial variation in density, size and social status in blotched foxfaceSiganus unimaculatuson an Okinawan coral reef

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1280 ◽  
Author(s):  
Atsushi Nanami
Keyword(s):  
Coral Reef ◽  
Home Range ◽  
Spatial Variation ◽  
Reef Flat ◽  
Pair Formation ◽  
Size Class ◽  
Reef Slope ◽  
Rocky Reef ◽  
Seagrass Bed ◽  
Agonistic Display

The present study examined pair formation, spatial pattern of home range and spatial variation in density, size and social status of blotched foxfaceSiganus unimaculatus(family Siganidae) on an Okinawan coral reef. Of 32 pairs sampled for sexing, 31 (96.9%) were heterosexual and showed size-assortative pairing. Developed ovaries were found in April and July, whereas oocytes were immature in August, September and February. Heterosexual pairing was found in both reproductive and non-reproductive periods. Home range size tended to be positively related to fork length (FL). The degree of home range overlap for same size class pairs was smaller than that for different size class pairs. The intraspecific behavior when two pairs approached each other was categorized as ‘attack,’ ‘agonistic display’ and ‘no interactions,’ and the frequency of agonistic behaviors (“attack” or “agonistic display”) was significantly greater than “no interactions.” Underwater observations at a seagrass bed, a rocky reef flat and a sheltered reef slope revealed that the mean FL was significantly smaller at the sheltered reef slope (4–13 cm) than at the rocky reef flat (>13 cm). No individuals were found in the seagrass bed. Most individuals less than 6 cm FL were solitary, whereas most individuals over 7 cm FL were paired. Density was significantly greater on the sheltered reef slope than on the rocky reef flat.

Population structure and trophic composition of the free-living nematodes inhabiting carbonate sands of Davies Reef, Great Barrier Reef, Australia

1986 ◽  
Vol 37 (5) ◽  
pp. 609 ◽  
Author(s):  
DM Alongi
Keyword(s):  
Population Structure ◽  
Great Barrier Reef ◽  
Reef Flat ◽  
Detrended Correspondence Analysis ◽  
Reef Crest ◽  
Barrier Reef ◽  
Back Wall ◽  
Free Living ◽  
Shallow Lagoon ◽  
Reef Zones

Population structure and trophic composition of free-living nematodes from carbonate sands within different functional zones (reef crest, reef flat and lagoon) of Davies Reef in the Great Barrier Reef were examined. At the reef crest (station C) and at a shallow lagoon area unprotected by the back wall of the reef flat (station G), sediments were subjected to intense wave action and supported significantly (P < 0.05) lower mean nematode densities (<60 individuals per 10 cm2) than sands within the other reef zones (100-400 individuals per 10 cm2). Mean nematode densities and numerical species richness were highest (P < 0.05) in a shallow lagoon habitat protected from hydrodynamic- induced disturbances by the back wall of the reef flat (station H). Differences in population densities among the reef zones were not related to water depth or sediment granulometry. Species diversity was low within the reef, with only six species present in deep lagoon sands co-inhabited by actively bioturbating ghost shrimps (Callianassa spp.). Normal classification, nodal analysis and detrended correspondence analysis indicated that faunal groups were distinct among the different reefal zones. Very coarse to medium sands at the reef crest and across the reef flat were inhabited primarily by omnivorous and epistrate-feeding nematodes. Most nematodes within the very fine to fine sands of the lagoon were non-selective or selective deposit feeders. Nematode community structure from the reef crest to the shallow lagoon appears to be determined primarily by sediment granulometry as controlled by reef hydrodynamics, whereas in the deep lagoon nematode communities are negatively affected by the presence of thalassinid ghost shrimps.

scholarly journals Composition and vertical distribution of free living and plant parasitic nematodes in hop gardens in the Czech Republic

2011 ◽  
Vol 48 (2) ◽  
pp. 124-136 ◽  
Author(s):  
V. Čermák ◽  
V. Gaar ◽  
L. Háněl ◽  
K. Široká
Keyword(s):  
Czech Republic ◽  
Vertical Distribution ◽  
Soil Profile ◽  
Parasitic Nematodes ◽  
Soil Nematode ◽  
Plant Parasitic Nematodes ◽  
Free Living ◽  
The Czech Republic ◽  
Nematode Communities ◽  
Plant Parasitic

AbstractComposition and vertical distribution of soil nematode communities within soil profile were investigated in eight hop gardens in Czech Republic. In total, the presence of 78 nematode genera was confirmed. Genus Drilocephalobus (Coomans & Coomans, 1990) is new for fauna of the Czech Republic. The highest abundance of soil nematodes was found at a depth of 0–10 cm and declined with increasing depth of soil profile. The most dominant genus was Bitylenchus, followed by genera Acrobeloides, Ditylenchus, Chiloplacus and Cervidelus. Ten genera of plant parasitic nematodes were recorded: Bitylenchus (with prevalence of B. dubius), Helicotylenchus, Heterodera (with absolute prevalence of H. humuli), Geocenamus, Longidorella, Longidorus (only L. elongatus), Merlinius (with prevalence of M. brevidens), Paratylenchus and Pratylenchus. Low population densities of predators and omnivores, low values of the community indices (MI, ΣMI, SI, and CI), and high values of NCR, EI, and PPI/MI ratio indicated disturbed nematode communities in hop gardens and bacteria-dominated decomposition pathways in the soil food web.

scholarly journals HUBUNGAN KELIMPAHAN IKAN CHAETODONTIDAE DENGAN KONDISI TERUMBU KARANG DI PERAIRAN DESA BUTON, KABUPATEN MOROWALI

2020 ◽  
Vol 5 (2) ◽  
pp. 153
Author(s):  
. Lisna ◽  
La Ode Muhammad Yasir Haya ◽  
Ratna Diyah Palupi
Keyword(s):  
Reef Flat ◽  
Reef Slope ◽  
Line Intercept

Terumbu karang merupakan ekosistem laut dangkal yang sangat produktif dan menjadi habitat berbagai biota laut termasuk Ikan famili Chaetodontidae. Ikan famili Chaetodontidae adalah salah satu ikan indikator pada ekosistem terumbu karang. Penelitian ini bertujuan untuk mengetahui kondisi terumbu karang, kelimpahan ikan Chaetodontidae, serta untuk mengetahui hubungan kelimpahan ikan Chaetodontidae dengan kondisi terumbu karang. Pengambilan data dilakukan pada bulan Maret 2019 berlokasi di Perairan Desa Buton, Provinsi Sulawesi Tengah. Data tutupan karang diperoleh dengan menggunakan metode Line Intercept Transect (LIT), sedangkan data ikan Chaetodontidae diperoleh dengan menggunakan metode Underwater Visual Sensus, dengan luas transek 150 m2, dilakukan pada 2 titik stasiun di zona reef flat dan reef slope, dengan dua kali pengulangan. Hasil study menunjukkan bahwa rata-rata kondisi karang di lokasi penelitian termasuk dalam kategori sedang (44,63%). Kondisi tutupan karang di stasiun-I dikategorikan baik yaitu zona reef flat (73,03%) dan reef slope (74,08%), sedangkan stasiun-II masuk dalam kategori buruk yaitu 15,68% pada reef flat dan 15,75% pada reef slope. Ikan Chaetodontidae yang ditemukan berjumlah 68 individu, yang terdiri atas dua genus dan delapan spesies, antara lain; Chaetodon kleinii, C. lineolatus, C. lunula, C. lunulatus, C. octofasciatus, C. vagabundus, Heniochus chrysostomus, H. varius. Berdasarkan stasiun penelitian, kelimpahan ikan Chaetodontidae tertinggi ditemukan di stasiun-I. Sedangkan berdasarkan zonasi terumbu karang, kelimpahan ikan Chaetodontidae tertinggi ditemukan di zona reef slope. Hubungan kelimpahan ikan Chaetodontidae dengan persentase tutupan karang hidup pada zona reef flat dan reef slope adalah memiliki hubungan yang kuat dengan nilai r = 0,991 (reef flat) dan r = 0,967 (reef slope). Sebaliknya, berdasarkan stasiun penelitian keduanya memiliki hubungan yang lemah dengan nilai r = 0,586 (Stasiun-I) dan r = 0,189 (Stasiun-II).Kata Kunci: Desa Buton, Ikan Chaetodontidae, Kelimpahan, Terumbu Karang.

scholarly journals PEMETAAN ZONA GEOMORFOLOGI DAN HABITAT BENTIK DI PULAU KOTOK BESAR MENGGUNAKAN KLASIFIKASI BERBASIS OBJEK

2018 ◽  
Vol 8 (2) ◽  
pp. 209-219
Author(s):  
Ike Dori Candra ◽  
Vicentius P. Siregar ◽  
Syamsul B. Agus
Keyword(s):  
Image Analysis ◽  
Reef Flat ◽  
Reef Slope ◽  
Reef Crest ◽  
Object Based Image Analysis ◽  
Object Based ◽  
Level 3 ◽  
Level 1 ◽  
Multiresolution Segmentation ◽  
Level 2

Penelitian ini menggunakan citra satelit resolusi tinggi worldview-2 akuisisi 5 Oktober 2013. Tujuan dari penelitian ini adalah untuk mengkaji kemampuan citra satelit resolusi tinggi worldview-2 dalam memetakan zona geomorfologi dan habitat bentik perairan dangkal di Pulau Kotok Besar. Metode yang digunakan adalah metode klasifikasi Object Based Image Analysis (OBIA). Metode ini mampu mendefinisikan kelas-kelas objek berdasarkan aspek spektral dan spasial. Segmentasi citra menggunakan algoritma multiresolution segmentation dengan parameter skala yang berbeda untuk setiap level, baik level 1, level 2 dan level 3. Shape dan compactness juga disesuaikan untuk setiap level. Penentuan kelas pada level 1 menghasilkan tiga kelas yaitu daratan, perairan dangkal dan perairan dalam. Penentuan kelas pada level 2 untuk zona geomorfologi menghasilkan tiga kelas yaitu reef flat, reef crest dan reef slope. Klasifikasi habitat bentik pada level 3 menghasilkan 7 kelas dengan akurasi keseluruhan yaitu 66.40 %.

The coral communities of Yongle atoll: status, threats and conservation significance for coral reefs in South China Sea

2016 ◽  
Vol 67 (12) ◽  
pp. 1888 ◽  
Author(s):  
Meixia Zhao ◽  
Kefu Yu ◽  
Qi Shi ◽  
Hongqiang Yang ◽  
Bernhard Riegl ◽  
...  
Keyword(s):  
South China Sea ◽  
Coral Reefs ◽  
South China ◽  
Reef Flat ◽  
Coral Cover ◽  
Reef Slope ◽  
Xisha Islands ◽  
China Sea ◽  
Marine Habitats ◽  
Coral Communities

Xisha Islands are in the central South China Sea and form one of the four large island groups in this region. They include more than 40 islands, reefs and cays, and have considerable ecological and biodiversity value, both intrinsically and as a source of larvae for coastal ecosystems throughout the South China Sea. Yongle atoll is the biggest and one of the most important atolls in the Xisha Islands. The detailed surveys of the marine habitats in the Yongle atoll were conducted from June to July 2013. This baseline survey revealed coral communities in a relatively healthy condition. Mean coral cover of different geomorphic habitats varied from 2 to 29%. Branching corals were most important, followed by encrusting and massive growth forms (48, 29 and 17% of coral cover). Pocillopora (29% of total cover in line transects), Porites (19%), Acropora (17%) and Montipora (16%) were the four dominant genera. Communities differentiated into four clusters, namely, lower reef slope, upper reef slope, outer reef flat, and inner reef flat and lagoon slope. This baseline investigation highlighted the ecological value of these reefs. Destructive fishing and overfishing are presently the most serious threats for these coral reefs. They should receive much more scientific and conservation attention.

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