scholarly journals STRUKTUR KOMUNITAS IKAN KARANG DI PERAIRAN KABUPATEN BANGGAI KEPULAUAN, SULAWESI TENGAH

2017 ◽  
Vol 15 (4) ◽  
pp. 321
Author(s):  
Isa Nagib Edrus ◽  
Guridno Bintar Saputro
Keyword(s):  
Reef Fish ◽  
Diversity Indices ◽  
Fish Diversity ◽  
Habitat Alteration ◽  
Study Objective ◽  
High Category ◽  
Economic Developments ◽  
Study Sites ◽  
Evenness Indices ◽  
A Current

Perubahan habitat karang adalah resiko yang mungkin dihadapi sebagai akibat pembangunan. Keanekaragaman ikan karang merupakan suatu indikator penting yang dapat memberikan gambaran perubahan pada lingkungan perairan karang. Tujuan penelitian ini adalah untuk mengetahui berbagai indeks ekologis komunitas ikan karang. Data ikan karang dikumpulkan dengan metode sensus visual pada daerah seluas l00 m'. Hasil penelitian menunjukkan bahwa indeks kekayaan (R,) ikan karang terkecil 4,47 dan terbesar 16,61. Kondisi keanekaragaman ikan karang masuk pada kategori sedang pada 21 lokasi (dengan indeks H: 2,65-3,44), kategori tinggi pada 11 lokasi (H: 3,48-3,88), dan kategori rendah pada 1 lokasi (H: 2,08). Indeks dominansi (D) masuk pada kategori rendah dan indeks keseragaman (E) masuk pada kategori tinggi untuk semua lokasi. Indeks jumlah koloni (N'l dan N2) relatif besar, variasinya terkecil 8,03 dan 4,81, dan terbesar 48,63 dan 32,58. Kelompok ikan karang mayor mendominansi komunitas ikan karang. Persentase kelompok ikan indikator tergolong kecil, kecuali untuk 1 lokasi. Potensi ikan target niaga cukup tin99i. Kepadatan ikan karang tergolong jarang, yaitu di bawah 10 ind./m'?. Nilai dari Indeks-indeks tersebut menunjukkan bahwa lingkungan perairan karang di Kabupaten Banggai Kepulauan pada umumnya dalam kondisi baik. Economic developments probably lead to habitat alteration isks. Reef fish diversity is a maior indicator to expose a current environmental state of coral reefs. The study objective is to tine out several diversity indices of reef fish communities. The data of reeffish was gathered by using a visualcensus transect method forthe reef sites of 100 square meters in areas. The results show that nchness indices (R1) of reef fish ranged from the lowest of 4.47 to the highest of 16.61. Shannon diversity indicds of reef fish felt in the fair category lot 21 study sites (indices H: 2.65-3.44), in the high category for 11 study sites (H: 3.48 3.88), and in the low category for one study site (H: 2.08). Dominance lndices (D) of reef fish felt in a low category and evenness indices felt in a high category for all study sites. Hill's Diversity numher (Nl and N2) included in high category, the lowest vaied lrom 8.03-4.81 and the highest vaied from 48.63-32,58. The major fish groups were predominant among reef tish communit'. Percentages of indicator fish species felt in low areas for all the study sites, except one the study site.Potencies of marketablelarget fish were high enough. Reef fish densities were grouped in rare areas,especially <10 ind./m2. Generally, the index rates indicated well for reef water environments of theBanggai Archipelago.

scholarly journals KESEHATAN TERUMBU KARANG DAN STRUKTUR KOMUNITAS IKAN DI PERAIRAN PANTAI PANGANDARAN, JAWA BARAT

2016 ◽  
Vol 8 (1) ◽  
pp. 37
Author(s):  
Sri Turni Hartati ◽  
Arip Rahman
Keyword(s):  
Reef Fish ◽  
Diversity Indices ◽  
Fish Diversity ◽  
Visual Technique ◽  
Reef Health ◽  
Economic Developments ◽  
Evenness Indices ◽  
Dominance Indices ◽  
Line Intercept ◽  
A Current

<p>Keanekaragaman jenis ikan karang merupakan suatu indikator penting yang dapat menggambarkan perubahan lingkungan perairan karang. Perubahan habitat karang adalah resiko yang mungkin dihadapi sebagai akibat pembangunan.  Penelitian dilakukan di perairan pantai Pangandaran dengan tujuan mengkaji kesehatan terumbu karang dan indeks ekologis komunitas ikan karang. Metode yang digunakan dalam penelitian ini adalah <em>line intercept transect</em> untuk menentukan persen tutupan karang dan metode sensus visual untuk menentukan keanekaragaman ikan karang pada area seluas 250m<sup>2</sup>. Hasil penelitian menunjukkan kesehatan terumbu karang pada kondisi buruk, tutupan karang hidup 11,4 -20,74%. Teridentifikasi 66 jenis ikan karang dengan kriteria kepadatan sangat jarang (0,59 – 0,91) ind/m<sup>2</sup>. Indeks kekayaan ikan karang pada kategori baik (4,60-8,68), keanekaragaman jenis ikan karang termasuk dalam kategori sedang (2,57-3,36). Tidak terjadi dominasi jenis ikan karang tertentu (0,05-0,120) dan kemerataan populasi di lokasi penelitian termasuk tinggi (0,81-0,87).</p><p> </p><p><em>Reef fish diversity is a major indicator to expose a current environmental state of coral reefs. Economic developments probably lead to habitat alteration risks. The research was conducted in Pangandaran Beach Waters, Batu Karas, Pananjung Barat, Pananjung Timur. The research objective was,  to assess the reef health, and to fine out several diversity indices of reef fish communities. Methods used for those are a line intercept transect and census visual technique within area of 250 m<sup>2</sup>. The results showed that all of the area had a poor reef health category(11,4-20,74%), reef fish densities were grouped in very rare areas, especially &lt; 1-5 ind/m<sup>2</sup>. Richnes indices had a good category(4,60-8,68), shannon diversity indices of reef fish felt in the fair category(</em>2,57-3,36), <em>dominance indices of reef fish felt in the low category(0,05-0,120) and evenness indices were felt in a high category(0,81-0,87).</em></p>

scholarly journals STRUKTUR KOMUNITAS IKAN KARANG DI PERAIRAN PESISIR KENDARI SULAWESI TENGGARA

2020 ◽  
Vol 26 (2) ◽  
pp. 59
Author(s):  
Isa Nagib Edrus ◽  
Tri Aryono Hadi
Keyword(s):  
Sea Water ◽  
Reef Fishes ◽  
Diversity Indices ◽  
Fish Diversity ◽  
Study Objective ◽  
Coral Reef Ecosystems ◽  
Fish Group ◽  
Low Levels ◽  
Study Sites ◽  
Evenness Indices

Ekosistem terumbu karang di Kawasan Pesisir Kendari sangat dipengaruhi oleh aktivitas pembangunan di daratan utama seperti sedimentasi yang berkepanjangan. Hal ini dapat berpengaruh pada tutupan karang dan kecerahan air laut, dan sebagai konsekuensinya adalah terjadinya perubahan struktur komunitas ikan karang. Keanekaragaman ikan karang diasumsikan akan menurun ketika terjadi kerusakan yang meluas pada terumbu karang dan dalam waktu yang panjang. Tujuan penelitian adalah untuk mengidentifikasi kondisi sumberdaya ikan karang melalui kajian struktur komunitas ikan karang. Penelitian ini dilakukan pada bulan September 2018 di perairan karang pesisir Kendari, Sulawesi Tenggara. Metode yang digunakan dalam kegiatan ini adalah sensus visual bawah air dengan transek sabuk pada 10 lokasi penelitian. Hasil penelitian menemukan 195 spesies ikan karang yang terdiri dari 93 spesies kelompok mayor, 89 jenis kelompok ikan target, dan 13 jenis kelompok ikan indikator. Dari 10 lokasi transek, hanya 4 stasiun yang memiliki nilai indeks keanekaragaman antara 3,0 – 3,6, indeks dominansi antara 0,04 – 0,10 dan indeks keseragaman antara 0,8 – 0,9, serta 5 stasiun memiliki indeks kekayaan jenis antara 7,8 hingga 10,5. Keanekaragaman jenis ikan termasuk rendah, komunitas didominasi oleh kelompok ikan mayor, dan kepadatan stok ikan karang tergolong rendah pada semua stasiun. Coral reef ecosystems in Kendari coastal area were affected by mainland development as well as long-term sedimentation.Those activities influencing coral coverage and sea water tranparency lead to the changes in reef fish structure communities. The study objective is to identify the condition of reef-fishes by analyzing theirin terms of a community structures. This study was carried out in September 2018 at the adjacent Kendari’s reef waters, Southeast Sulawesi. The method used in this study was the underwater visual cencus using belt transects at ten study sites. The results of the study successfully identified about 195 species of reef fishes, consisted of 93 species of major-fish group, 89 species of target-fish group, and 13 species of indicator-fish group. Species compositions among the study sites ranged from 39 species to 74 species. Among the 10 transect sites, four sites had fish diversity indices ranging from 3.0 to 3.6, dominance indices ranging from 0.04 – 0.1, and evenness indices ranging from 0.8 to 0.9, whereas 5 transect sites had species richness levels ranging from 7.8 to 10.5. For all study sites, the reef fishes diversities were in low levels, reef fishes communities were dominated by major-fish groups, and the density of fish stocks were classified in low levels.

scholarly journals SUMBER DAYA IKAN KARANG DI TAMAN WISATA ALAM GILI MATRA, LOMBOK BARAT

2017 ◽  
Vol 22 (4) ◽  
pp. 225
Author(s):  
Isa Nagib Edrus ◽  
Sasanti Retno Suharti
Keyword(s):  
Reef Fish ◽  
Fish Diversity ◽  
Fish Length ◽  
Study Objective ◽  
Fish Resources ◽  
Parupeneus Multifasciatus ◽  
Marine Park ◽  
Target Fish ◽  
Mulloidichthys Flavolineatus ◽  
Scarus Ghobban

Keanekaragaman dan kelimpahan ikan karang adalah indikator yang baik untuk menilai secara dini adanya dampak pada ekosistem terumbu karang dari sebab kegiatan manusia yang tinggal di sekitar Taman Wisata Alam Laut. Tujuan penelitian ini adalah untuk mengindentifikasi sumber daya ikan karang yang ditinjau dari sisi keanekaragaman jenis, kepadatan individu, komposisi dan biomassa ikan karang dari kelompok fungsional ikan karang. Penelitian dilakukan pada September 2014 dengan metode sensus visual bawah air. Berat ikan didapat dengan cara mensubsitusikan panjang ikan ke rumus panjang berat (W= aXb). Hasil penelitian menunjukkan bahwa terdapat sedikitnya 27 spesies ikan indikator dan 84 spesies ikan target dari 16 famili. Kelompok ikan herbivora dijumpai 36 spesies dari 3 famili, ikan karnivora dijumpai 43 spesies dari 10 famili dan ikan planktivora 5 spesies dari 3 famili. Urutan dari 10 terbesar ikan karang yang dijumpai terdiri dari Ctenochaetus striatus (13 ekor/350m2), Mulloidichthys flavolineatus (10,25 ekor/350m2), Acanthurus olivaceus (8,4 ekor/350m2), Parupeneus multifasciatus (6,5 ekor/350m2), Myripristis kuntee (5,5 ekor/350m2), Kyphosus cinerascens (5,25 ekor/350m2), Lutjanus kasmira (5,13 ekor/350m2), Acanthurus leucocheilus (4,9 ekor/350m2), Scarus ghobban (4,6 ekor/350m2), Parupeneus bifasciatus (4,6 ekor/350m2). Rata-rata kelimpahan ikan karang tertinggi 0,46 individu/m2 dan terendah 0,06 individu/m2. Rata-rata biomassa ikan karang 81,2 kg/350m2 dan terendah 4,69 kg/350m2. Ikan karang target tersedia 1.126 kg per hektar. Reef fish diversity and abundance are good indicators to assess early for impacts on coral reefs ecosystem resulted from human activities living in the adjacent waters of the Gili Matra Tourism Marine Park. The study objective is to identify reef fish resources with regards to species deversity, density, composition and biomass of reef fish functional groups. The work was carried out in September 2014 with a census visual method. Body weight is derived from putting in fish length to weight-length formula (W=aLb). The results show that there were at least 27 species of coralivorous fishes and 84 species of target fish belong to 16 families. There were 36 herbivorous fishes of three families, 43 carnivorous fishes of ten families, and 5 planktivorous fishes of three families. The ten greatest of reef fish biomass were consisted of Ctenochaetus striatus (13 individual/350m2), Mulloidichthys flavolineatus (10.25 individual/350m2), Acanthurus olivaceus (8.4 individual/350m2), Parupeneus multifasciatus (6.5 individual/350m2), Myripristis kuntee (5.5 individual/350m2), Kyphosus cinerascens (5,25 individual/350m2), Lutjanus kasmira (5.13 individual/350m2), Acanthurus leucocheilus (4.9 individual/350m2), Scarus ghobban (4.6 individual/350m2), Parupeneus bifasciatus (4.6 individual/350m2). The abundance of individual reef fish was ranged from the highest of 0.46 individu/m2 to the lowest of 0.06 individual/m2. The biomass of reef fish was ranged from the highest of 81.2 kg/350m2 to the lowest of 4.69 kg/350m2. The target fish was available for 1.126 kg per hectar. 

scholarly journals Abundance, diversity and distribution of macrophyte communities in neighboring lakes of different trophic states and morphology in north-central Greece

2011 ◽  
Vol 63 (3) ◽  
pp. 763-774 ◽  
Author(s):  
Chrisoula Pirini ◽  
Vasiliki Karagiannakidou ◽  
Savvas Charitonidis
Keyword(s):  
Environmental Factors ◽  
Aquatic Vegetation ◽  
Floristic Composition ◽  
Diversity Indices ◽  
North Central ◽  
Wetland Ecosystems ◽  
Central Greece ◽  
Clear Differentiation ◽  
Evenness Indices

The role of aquatic vegetation in wetland ecosystems is closely related with their abundance, diversity and distribution, which in turn represents synergy of various environmental factors. The floristic composition of the aquatic vegetation in two neighboring lakes (Vegoritida and Petron) in north-central Greece was investigated by means of 160 relev?s, which were recorded using the Braun-Blanquet method. The analysis of relev?s based on TWINSPAN clustering showed the existence of 10 plant communities from the Lemnetea, Potametea, Phragmito-Magnocaricetea and Juncetea maritimi classes. The most important environmental factors for the vegetation differentiation in the study area, according to the ordination diagram, are light intensity and water depth of the habitats. The plant species diversity was quantified with species richness, Shannon Diversity and evenness indices at a scale of each relev?, with a sampling size of 20 m2. There was a clear differentiation between the relev?s at the more eutrophic Petron Lake and those at Vegoritida Lake. The mean plot diversity was also calculated for each plant community, to enable comparison of the diversity indices among the communities at the plot level.

scholarly journals DYNAMICS OF FRUIT FLIES POPULATIONS IN TWO MANGO PRODUCTION ZONES (KORHOGO AND FERKÉ) IN NORTHERN CÔTE D’IVOIRE

2019 ◽  
Vol 7 (7) ◽  
pp. 256-264
Author(s):  
Minhibo Magloire Yves ◽  
Akpesse Akpa Alexandre Moïse ◽  
Coulibaly Tenon ◽  
Koua K Hervé ◽  
Coulibaly Adama
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Diversity Indices ◽  
Fruit Flies ◽  
Shannon Index ◽  
Bactrocera Dorsalis ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Set Up ◽  
Study Sites

Fruit flies are a major constraint to the production and export of mangoes by causing the rot of mangoes. The objective of this work is to follow the fluctuation of population of flies in the northern part of Côte d'Ivoire between May 2015 and October 2016. A network of trapping flies using food baits (the Torula and Ceratrap) and sexual attractants (Methyl Eugenol and Trimedlure) were set up in Korhogo and Ferké mango orchards with the forest Diabaté Kamonon and the forest Petit Clerc as reference area. During trapping, 11 species of fruit flies were identified at all study sites. Among these species, Bactrocera dorsalis and Ceratitis cosyra, were the most abundant in the area. In general, diversity indices were low. The Ferké’s Forest has the highest Shannon index (H = 1.20). This index was higher than the index found in Ferke's orchards (0.9398). At Korhogo the Shannon index in orchards (H = 0.84) is higher than in the forest (H = 0.41). It has been observed that the genus Bactrocera swarmed on mango orchards when precipitation was plentiful. While the genus Cerartitis only appeared when precipitation was low. In addition, knowledge of the ecology and fluctuation of fruit flies, will allow to develop a site monitoring device through a trapping system with sexual and food attractants.

Larval fish diversity on the Scotian Shelf

2000 ◽  
Vol 57 (9) ◽  
pp. 1747-1760 ◽  
Author(s):  
N L Shackell ◽  
K T Frank
Keyword(s):  
Larval Fish ◽  
Diversity Indices ◽  
Fish Diversity ◽  
Calanoid Copepods ◽  
Scotian Shelf ◽  
Genus Richness ◽  
Using Data ◽  
Negative Exponential ◽  
Number Of Individuals ◽  
The Relationship

We examined larval fish diversity on the Scotian Shelf using data, representing 91 genera, collected during the Scotian Shelf Ichthyoplankton Program from 1978 to 1982. Two diversity indices (genus richness (GR) and Shannon's entropy (H)) were relatively lower from December to February-March and relatively higher and stable from April to September-October. Taxon composition changed seasonally. Total median log abundance (log10(number of individuals + 1)·1000 m-3) was low from December to February, increased in March, was stable from April to June, and declined from July to October. Our results suggest that the abundance trends of most taxa were not coincident with either a spring or fall bloom of calanoid copepods. Log GR was significantly positively related to H (r = 0.62, p < 0.001, n = 1853). A negative exponential best described the relationship between log GR and log abundance (R2 = 0.77; log GR = 1.37(1 – e-(1.13)(log abundance)), p < 0.001, n = 2357). Shannon's H was not related to log abundance in winter or in summer-fall and was negatively correlated in spring-summer (r = -0.12, p = 0.003, n = 593). Thus, diversity increases with abundance but the composition is dominated by relatively fewer genera at higher levels of abundance. Western - Sable Island banks had higher levels of GR and abundance in all seasons. Additional banks were diverse and productive during warmer months.

Different reproductive strategies in a sex-changing coral reef fish Centropyge bicolor (Pomacanthidae)

1986 ◽  
Vol 37 (3) ◽  
pp. 353 ◽  
Author(s):  
JM Aldenhoven
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Reproductive Strategies ◽  
Field Data ◽  
Dominant Male ◽  
Initial Cost ◽  
Natural Density ◽  
Study Sites ◽  
Better Than

A model is developed which evaluates the reproductive advantage of staying female or changing sex and becoming a male, using field data for the angelfish C. bicolor. Changing sex can lead immediately to taking over a territory and mating with a harem, or it may involve a period of time as a bachelor which waits for a territory vacancy. Bachelor males carry an initial cost of little or no reproduction but on the death of a dominant male have a better chance than females of acquiring territories and haremmating success. The model predicts that to be a bachelor is better than to stay female up to a certain density of bachelors. The predicted frequency of bachelors agrees with their natural density in the area in which they occur. The model also predicts that under some conditions there will be no advantage in becoming a bachelor; this agrees with observations at three study sites.

scholarly journals Reef Fishes Colonization Rate Around Artificial Reef in Putus-putus Island, South-East Minahasa District

2017 ◽  
Vol 5 (1) ◽  
pp. 21
Author(s):  
Laurentius T. X. Lalamentik ◽  
Unstain N. W. J. Rembet ◽  
Adnan S. Wantasen
Keyword(s):  
Reef Fish ◽  
Fish Species ◽  
Research Effort ◽  
Artificial Reef ◽  
Environmental Parameters ◽  
Reef Fishes ◽  
Artificial Reefs ◽  
Colonization Rate ◽  
Study Sites ◽  
Number Of Individuals

A comprehensive research effort was directed to increase the ecological role of Putus-Putus island coral reefs. This study was an implementation of artificial reef technology as fish colonization locality. The artificial reefs were made of 20x20x100 cm-concrete blocks placed in 6 levels and located at the depth of 8-10 m. Reef fish observations were done three times in two locations. Environmental parameters, such as temperature, salinity and visibility, were also measured. Environmental parameters (temperature, salinity a. Water temperature (29.65oC and 29.64oC) supported the coral growth as well. Salinity distribution  was not significantly different among the study sites.  This study also found 37 reef fish species belonging to 18 families. Number of species varied with observed time and localities. Total number of individuals increased with number of fish species. Mean number of individuals and species of reef fish in locality B were higher than those in locality A. Moreover, the reef fish colonization rate in the study site followed the model y = 4.3801e0.5249x with R2= 0.9297 in the strait and y = 5.0397e0.5493x  with R2= 0.9297 for the Bay. Keywords: Artificial reefs, reef fish. Abstrak Suatu upaya penelitian yang komprehensif diarahkan untuk peningkatan fungsi ekologi terumbu karang Pulau Putus-Putus. Penelitian ini berupa penerapan teknologi terumbu buatan sebagai tempat hunian ikan. Terumbu buatan terbuat dari balok cor beton berukuran 20x20x100 cm bersusun 6 dan ditempatkan pada kedalaman 8-10 m. Pengamatan ikan karang dilakukan 3 kali di 2 lokasi berbeda. Parameter lingkungan, seperti suhu, salinitas, dan kecerahan, juga diukur.    Hasil pengukuran yang diperoleh (29,65 oC dan 29,64 oC) termasuk suhu yang optimal untuk pertumbuhan karang. Dari hasil penelitian, ditemukan 37 spesies yang masuk dalam 18 famili ikan karang. Jumlah spesies yang ditemukan bervariasi pada setiap waktu dan lokasi pengamatan. Pengambilan spesies ikan karang dilakukan pada 2 lokasi dengan masing-masing lokasi dilakukan 3 kali pengambilan sampel. Berdasarkan hasil yang diperoleh (tabel 03) dapat dilihat bahwa jumlah individu bertambah seiring dengan banyaknya jumlah spesies ikan karang yang didapat. Rata-rata jumlah individu dan jumlah spesies ikan karang pada lokasi B lebih banyak. Laju hunian ikan karang di lokasi penelitian mengikuti model y = 4.3801e0.5249x dengan R2= 0,9297 untuk lokasi Selat dan y = 5.0397e0.5493x  dengan R2= 0,9297 untuk lokasi Teluk. Kata kunci : Terumbu buatan, ikan karang

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