scholarly journals INDEKS KEANEKARAGAMAN HAYATI IKAN DEMERSAL DI PERAIRAN ARAFURA

2017 ◽  
Vol 14 (3) ◽  
pp. 321
Author(s):  
Suprapto Suprapto
Keyword(s):  
Fish Community ◽  
Diversity Index ◽  
Demersal Fish ◽  
Sampling Location ◽  
Diversity Analysis ◽  
Species Diversity Index ◽  
Arafura Sea ◽  
Evenness Indices ◽  
Swept Area ◽  
Hill Number

Penelitian tentang indeks keanekaragaman hayati ikan demersal telah dilakukan pada periode tahun 2001 sampai dengan 2006 menggunakan sarana kapal riset KM. Mutiara, KM. Bawal Putih I, dan KM. Mandidihang 02. Data spesies ikan demersal dikumpulkan dari hasil pengambilan contoh penangkapan menggunakan alat tangkap jaring pukat dasar dengan metode sapuan area. Pengambilan contoh dilakukan di sub lahan tepian Laut Arafura (sekitar daerah Mappi sampai dengan Dolak) dan sub lahan tengah Laut Arafura (sekitar Kepulauan Aru). Hasil analisis menunjukkan bahwa status kekayaan jenis ikan demersal sampai dengan tahun 2006 memiliki 149 spesies yang tergolong dalam 71 famili. Ikan-ikan yang cenderung memiliki jumlah individu terbanyak adalah kelompok famili ikan petek (Leiognathidae), gerot-gerot (Pomadasyidae), dan gulamah (Scianidae). Tingkat keanekaragaman jenis ikan demersal di perairan Arafura termasuk dalam kategori sedang. Kondisi komunitas bersifat labil dan cenderung mengalami penurunan. Status keanekaragaman hayati sampai dengan tahun 2006 memiliki indeks keanekaragaman jenis Shanon-Wiener (H’) berkisar 2,22 sampai dengan 2,79; indeks kekayaan jenis Margalef (R1 ) berkisar 4,84 sampai dengan 11,23; indeks keragaman Hill number (N1) berkisar 9,2 sampai dengan 16,3 dan indeks kemerataan jenis Pielou (E) berkisar 0,54 sampai dengan 0,56. Study on biodiversity indices of demersal fish was conducted in the period of 2001 until 2006 by using research vessel MV. MUTIARA, MV. BAWAL PUTIH I, and MV. MANDIDIHANG 02. Species data of demersal fish were collected from fishing samples by using bottom trawl with swept area method. Sampling location in the waters shore of Arafura Sea with sub area Mappi to Dolak and middle area of Arafura Sea (around of Aru Island). Result indicates that status of richness species of demersal fish till year 2006 of 149 species belongging to 71 families were recorded. Dominant families were Leiognathidae, Pomadasyidae, and Scianidae. From diversity analysis it also indicates that species diversity index in the Arafura Sea was at mid level. Condition of fish community was likely labile and the trend of it was decreasing. Index of biodiversity up to 2006 Shanon-Wiener (H’) was 2.22 until 2.79; species richness indices of Margalef (R1 ) were 4.84 until 1.23, diversity number Hill (N1) 9.2 until 16.3, and evenness indices of Pielou (E 1) were 0.54 until 0.56.

scholarly journals STRUKTUR KOMUNITAS IKAN PADA AREAL BUDIDAYA RUMPUT LAUT SISTEM LONG LINE DI TELUK EKAS LOMBOK TIMUR

2013 ◽  
Vol 13 (2) ◽  
Author(s):  
Muhammad Sulaiman, Lalu Japa Dan I Putu Artayasa
Keyword(s):  
Community Structure ◽  
Species Diversity ◽  
Fish Community ◽  
Diversity Index ◽  
Sampling Technique ◽  
Fish Community Structure ◽  
Species Diversity Index ◽  
Long Line ◽  
Removal Sampling

ABSTRAKPenelitian ini bertujuan untuk menggambarkan struktur komunitas ikan pada arealbudidaya rumput laut secara long line di Teluk Ekas Lombok Timur. Metode yangdigunakan adalah metode survei dengan menggunakan jaring sapu. Teknik pengambilan datateknik removal sampling. Analisis data untuk menggambarkan struktur komunitas ikanadalah analisis secara diskriptif pada parameter jumlah jenis ikan, kemelimpahan,keanekaragaman, keseragaman, dan dominansinya. Hasil analisis menunjukkan bahwajumlah spesies yang diperoleh sebanyak 886 yang terdiri dari 19 spesies. Spesies ikan yangpaling melimpah adalah Apogon angustatus diikuti oleh Achreichtys tomentosus dan Histriohistrio. Indeks keanekaragaman spesies termasuk kategori sedang. Sedangkan indekskeseragaman kategori tinggi dan dominansi berada pada katagori rendah. Kesimpulan daripenelitian ini dimana indeks keanekaragaman spesies ikan pada areal budidaya rumput laut diperairan Teluk Ekas secara keseluruhan sebesar 2,55. Nilai keanekaragaman tersebut dapatmenunjukkan bahwa rumput laut memiliki peran yang cukup besar dalam meningkatakanjumlah jenis ikan di lokasi studi.Kata-kata kunci: Kemelimpahan, Keanekaragaman, Keseragaman dan DominansiABSTRACTA research on fish community structure in the area of long line seaweeds mariculture of Ekasbay East Lombok was done. Samplings of fish were conducted during September and October2011. Removal sampling technique was applied in this research. Sample of fishes wereidentified and analyzed for density, diversity, equitability or evenees, and domiancy. Total886 fishes collected were identified as 19 species. Three species with the highest density wereApogon angustatus, Achreichtys tomentosus, and Histrio histrio. Species diversity index offish in Ekas bay was in intermediate category. Furthermore, species index equitability orevenees and dominancy were high and low category, respectively. This means there was nofish species dominated other species. All 19 species of fish recorded in this research were inrelative similar number of individual.Key Words: community structure, fish, seaweeds, Ekas bay

scholarly journals Fish Communities in the Poodří Protected Landscape Area (the Odra River basin)

2011 ◽  
Vol 49 (No. 3) ◽  
pp. 121-130
Author(s):  
B. Lojkásek ◽  
S. Lusk ◽  
K. Hala ◽  
V. Lusková
Keyword(s):  
Native Species ◽  
Fish Community ◽  
Diversity Index ◽  
Hydrological Regime ◽  
Rutilus Rutilus ◽  
Total Biomass ◽  
Species Diversity Index ◽  
Barbus Barbus ◽  
Odra River ◽  
The Individual

The Odra River, 55.2 kmof its length, is winding through the Poodří Protected Landscape Area, which has total area of 81,5 km<sup>2</sup>. More than 80% of its stream has retained the natural character of its riverbed and the hydrological regime with regular floods. Ichthyologic research was carried out in the period 1997–2001. It took place in 7 localities comprising 3 localities situated in main tributaries and 4 localities of former river arms. Gill nets and electrofishing were used for the research on limnetic biotopes. A total of 22 fish species in the streams (Odra, Lubina, Ondřejnice, and Bílovka Rivers) and 4 other species in stagnant water bodies were found. Out of all identified species, Oncorhynchus mykiss, Pseudorasbora parva, and Carassius auratus are not native species. Anglers identified further 7 species in their catches. The studied river sections are inhabited by the Barbus – Chondrostoma fish community. The highest biomass belongs to the most frequent species Leuciscus cephalus, Rutilus rutilus, and Barbus barbus. Total abundance in the individual localities ranged from 2 416 to 20 392 fishes/ha and total biomass was in the range from 174 to 788.8 kg/ha. The species diversity index H’ of ichthyocenoses fluctuated between 2.238 to 3.108 in the area. There were 4–8 species in low numbers in 4 searched pools. The biomass was also low and the diversity index H’ ranged from 1.390 to 1.737.  

scholarly journals KERAGAMAN SPESIES DAN PERSEBARAN FAUNA ANURA DI CAGAR ALAM DAN TAMAN WISATA ALAM TELAGA WARNA

EKOLOGIA ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 73-79
Author(s):  
Wawan Setiawan ◽  
Wahyu Prihatini ◽  
Sri Wiedarti
Keyword(s):  
Species Diversity ◽  
Nature Reserve ◽  
Diversity Index ◽  
Population Control ◽  
Natural Habitat ◽  
Insect Population ◽  
Sampling Location ◽  
Species Diversity Index ◽  
Nature Park

Anura includes frogs and toads, playing an important role as ecosystem quality bioindicators, as well as insect population control. Anura is very sensitive to changes in the environment, since its egg stadium. Disruption to its natural habitat, can threaten Anura's survival. This research is done in the Nature reserve area and Telaga Warna Natural Nature Park. Observations using the Visual Encounter Survey (VES) method. Analyses conducted include the calculation of the species diversity index of Shannon-Wienner, the frequency of species meetings, and the density of species. The results of the research gained 11 species of Anura from 5 families, namely Megophryidae, Microhylidae, Ranidae, Dicroglossidae, and Rhacoporidae. The level of diversity of Anura species in the research site is moderate (H ' = 0.152). Density ranged from 0.07 to 0.24 tails/m2, and the highest density is demonstrated by the Rhacophorus margaritifer. The frequency of meetings at a sampling location ranges from 0.01 to 3.6%, with the highest frequency being Rana chalconota. Generally, the quality of the ecosystem of Telaga Warna is good, especially in the area of Gayung Swamp

Dissolved oxygen and temperature best predict deep-sea fish community structure in the Gulf of California with climate change implications

2020 ◽  
Vol 637 ◽  
pp. 159-180
Author(s):  
ND Gallo ◽  
M Beckwith ◽  
CL Wei ◽  
LA Levin ◽  
L Kuhnz ◽  
...  
Keyword(s):  
Climate Change ◽  
Community Structure ◽  
Community Composition ◽  
Environmental Conditions ◽  
Deep Sea ◽  
Gulf Of California ◽  
Fish Community ◽  
Demersal Fish ◽  
Fish Community Structure ◽  
Explained Variance

Natural gradient systems can be used to examine the vulnerability of deep-sea communities to climate change. The Gulf of California presents an ideal system for examining relationships between faunal patterns and environmental conditions of deep-sea communities because deep-sea conditions change from warm and oxygen-rich in the north to cold and severely hypoxic in the south. The Monterey Bay Aquarium Research Institute (MBARI) remotely operated vehicle (ROV) ‘Doc Ricketts’ was used to conduct seafloor video transects at depths of ~200-1400 m in the northern, central, and southern Gulf. The community composition, density, and diversity of demersal fish assemblages were compared to environmental conditions. We tested the hypothesis that climate-relevant variables (temperature, oxygen, and primary production) have more explanatory power than static variables (latitude, depth, and benthic substrate) in explaining variation in fish community structure. Temperature best explained variance in density, while oxygen best explained variance in diversity and community composition. Both density and diversity declined with decreasing oxygen, but diversity declined at a higher oxygen threshold (~7 µmol kg-1). Remarkably, high-density fish communities were observed living under suboxic conditions (<5 µmol kg-1). Using an Earth systems global climate model forced under an RCP8.5 scenario, we found that by 2081-2100, the entire Gulf of California seafloor is expected to experience a mean temperature increase of 1.08 ± 1.07°C and modest deoxygenation. The projected changes in temperature and oxygen are expected to be accompanied by reduced diversity and related changes in deep-sea demersal fish communities.

Carabidae of Barnaul city parks: ecological characteristics and species composition

2018 ◽  
Vol 8 (2) ◽  
pp. 348-353
Author(s):  
E. A. Kuchina ◽  
N. D. Ovcharenko ◽  
L. D. Vasileva
Keyword(s):  
Species Composition ◽  
Diversity Index ◽  
Similarity Index ◽  
Life Forms ◽  
Ground Beetles ◽  
Forest Steppe ◽  
Ecological Groups ◽  
Dominant Group ◽  
Species Diversity Index ◽  
Steppe Species

<p>Anthropogenic impact on the population of ground beetles leads to a change in their numbers, structure of dominance, density, species composition, spectrum of life forms. This makes the beetles Carabidae a convenient and informative bioindicator of the ecological state of biocenoses. The material for this work was the Carabidae collections conducted in June-August 2016-2017 in the park zone of different regions of Barnaul, differing in location, area, hydrological regime, vegetation cover, purpose and anthropogenic load. When processing the material, the quantitative, species and generic composition of the carabidae was determined, calculations were made for such indicators as the Berger-Parker dominance index, the Shannon species diversity index (Hs), and the Jacquard species similarity index. The fauna (Coleoptera, Carabidae) of the park zone of Barnaul is represented by 55 species belonging to 20 genera. The dominant group is represented by species belonging to steppe, forest and polyzonal groups. Forest-steppe species of ground beetles as dominants have not been identified in any of the investigated territories. The greatest variety of ecological groups was noted on the territory of the Yubileyny рark, which is explained by the presence of zones with various microclimatic conditions, the presence of a birch grove that flows through the park with the Pivovarka River, and a wide log in the park. Registered species belong to eight groups of life forms belonging to two classes - zoophagous and myxophytophagous. On the numerical and species abundance, zoophages predominate. The spectrum of life forms corresponds to the zonal spectrum characteristic of the forest-steppe zone.</p><p> </p>

scholarly journals Carbon stocks of homestead forests have a mitigation potential to climate change in Bangladesh

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tarit Kumar Baul ◽  
Tajkera Akhter Peuly ◽  
Rajasree Nandi ◽  
Lars Holger Schmidt ◽  
Shyamal Karmakar
Keyword(s):  
Species Diversity ◽  
Stand Structure ◽  
Diversity Index ◽  
Carbon Stocks ◽  
Small Scale ◽  
Species Diversity Index ◽  
C Stocks ◽  
Homestead Forests ◽  
C Stock ◽  
Low Altitude

AbstractA total of 176 homestead forests at three altitudes in the Chittagong Hill Tracts, Bangladesh were randomly surveyed to estimate carbon (C) stocks and how stand structure affects the biomass C. All woody vegetations were measured, and litter and soil (0–30 cm depth) were sampled. The tree biomass C stock in the top two altitude forests was up to 37–48% higher than in low altitude, owing to significantly higher tree density and species diversity. An increase in species diversity index by one unit increased the biomass stock by 23 Mg C ha−1. The C stock of litterfall in low altitude forests was 22–28% higher than in the top two altitude due to the deposition of litters downslope and deliberate use of mulch for soil improvement and conservation, resulting in up to 5% higher total soil C. The topsoil C was 10–25% higher than the deeper soil, depending on the altitude. The forest stored 89 Mg C ha−1, indicating a potential for C sequestration in trees outside forest. This study would help policymakers to strengthen the recognition of small-scale forests for mitigation in REDD + (reducing emissions from deforestation and forest degradation, the role of conservation, sustainable management of forests, and enhancement of forest carbon stocks) and support owners through C credits from sustainably managed forests.

scholarly journals Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community

2012 ◽  
Vol 69 (1) ◽  
pp. 8-22 ◽  
Author(s):  
Simon P. R. Greenstreet ◽  
Helen M. Fraser ◽  
Stuart I. Rogers ◽  
Verena M. Trenkel ◽  
Stephen D. Simpson ◽  
...  
Keyword(s):  
North Sea ◽  
Fish Community ◽  
Size Structure ◽  
Demersal Fish ◽  
Community Size ◽  
The North ◽  
Management Objectives ◽  
The North Sea ◽  
Composition Structure ◽  
And Function

Abstract Greenstreet, S. P. R., Fraser, H. M., Rogers, S. I., Trenkel, V. M., Simpson, S. D., and Pinnegar, J. K. 2012. Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community. – ICES Journal of Marine Science, 69: 8–22. Broader ecosystem management objectives for North Sea demersal fish currently focus on restoring community size structure. However, most policy drivers explicitly concentrate on restoring and conserving biodiversity, and it has not yet been established that simply restoring demersal fish size composition will be sufficient to reverse declines in biodiversity and ensure a generally healthy community. If different aspects of community composition, structure, and function vary independently, then to monitor all aspects of community general health will require application of a suite of metrics. This assumes low redundancy among the metrics used in any such suite and implies that addressing biodiversity issues specifically will require explicit management objectives for particular biodiversity metrics. This issue of metric redundancy is addressed, and 15 metrics covering five main attributes of community composition, structure, and function are applied to groundfish survey data. Factor analysis suggested a new interpretation of the metric information and indicated that a minimum suite of seven metrics was necessary to ensure that all changes in the general health of the North Sea demersal fish community were monitored properly. Covariance among size-based and species-diversity metrics was low, implying that restoration of community size structure would not necessarily reverse declines in species diversity.

Carbon stock assessment through above-ground biomass of trees at different forest composition in Mt. Malindawag, Lubilan, Naawan, Misamis Oriental, Philippines

2021 ◽  
Vol 11 (01) ◽  
pp. 100-113
Author(s):  
M. G. Origenes ◽  
R. L. Lapitan
Keyword(s):  
Carbon Stock ◽  
Diversity Index ◽  
Stock Assessment ◽  
Mixed Forest ◽  
Forest Composition ◽  
Above Ground Biomass ◽  
Plantation Forest ◽  
Species Diversity Index ◽  
Ground Biomass ◽  
Number Of Individuals

It is documented that the amounts of carbon stored and its level of degradation in different forests compositions and different types of forest is mostly unknown, Philippines is no exemption as little was done in some places of this country. This study was conducted to assess carbon stock through above ground biomass of trees at different forest composition in Mt. Malindawag. There were three (3) 20m x 20m sample plots (quadrats) (400m2 equivalent to 0.04 ha) established as replicate plots provided with 50m intervals. Forest composition such as the Agroforestry area, mixed forest area and the Plantation forest were assessed in terms of the number of individuals, number of species, diameter, and height to calculate the biomass, tree biomass density as well as the carbon stock. Based on the results of the study conducted in different forest compositions of Mt. Malindawag, plantation forest has the highest carbon stocking rate. However, these results were not significantly different from the other forest composition. This was associated with a higher accumulated diameter, which resulted in higher biomass and eventually carbon stock. Species found in this forest composition are productive and have lesser number of individuals; therefore, there is lesser competition for resources such as light. Such a mechanism might contribute to the higher biomass and carbon stock. However, the result may not be right to other areas due to uncontrollable factors, anthropogenic and environmental factors. Hence, it is recommended to have further studies on areas where trees have similar age, species diversity index as well as stand development and site productivity for a more accurate and quantifiable carbon stock.

scholarly journals Tintinnids (Ciliophora, Oligotrichea) within power plant discharge and marine protected areas in Masinloc-Oyon Bay

Check List ◽  
2021 ◽  
Vol 17 (6) ◽  
pp. 1533-1539
Author(s):  
Jane Abigail Santiago ◽  
Ma Carmen Ablan-Lagman
Keyword(s):  
Power Plant ◽  
Protected Areas ◽  
Marine Protected Areas ◽  
Diversity Index ◽  
Thermal Power ◽  
The Philippines ◽  
Field Sampling ◽  
Species Diversity Index ◽  
Philippine Sea ◽  
West Philippine Sea

There are only five studies on tintinnids of the Philippines. We present a checklist of tintinnids (Ciliophora, Oligotrichea) from Masinloc-Oyon Bay, Province of Zambales, West Philippine Sea. Masinloc-Oyon Bay is a unique in having both marine protected areas and a coal-fired thermal power plant within the same bay. Field sampling was performed in July 2017, which recorded 10 species belonging to one order, six families, and seven genera. Station 1 inside the power plant&rsquo;s outfall had the lowest diversity, whereas the stations within marine protected areas had a relatively higher species diversity index. Our new data are the first records of tintinnid species in Masinloc-Oyon Bay. These records add to the regional checklist of the Philippine Sea.

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