scholarly journals Population structure of giant clams (tridacnidae) in Aceh Besar district waters

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
M Rizki Fazillah ◽  
Chitra Octavina ◽  
Muhammad Agustiar ◽  
Muhammad Akhyar
Keyword(s):  
Population Structure ◽  
Coral Reef ◽  
Distribution Pattern ◽  
Diversity Index ◽  
Similarity Index ◽  
Giant Clam ◽  
Giant Clams ◽  
Coral Reef Area ◽  
The Individual ◽  
Index Value

Giant clams have an essential ecological role in the coral reef ecosystem. Given the decreasing number of giant clams in nature, the status of giant clams as protected animals, and there is still little information about giant clams, data or information is needed to make policies regarding giant clam conservation management. This study aimed to determine the population structure of giant clams (Tridacnidae) in the coral reef area of Aceh Besar District. The research was conducted in May 2018, located in Aceh Besar Regency waters with six observation stations. Observation of giant clams is carried out using a visual census technique with the belt transect method. The observations showed that the giant clams found in Aceh Besar waters consisted of 2 species, namely Tridacna maxima and Tridacna crocea. Overall stations, the individual density of giant clams is 0.041 ind. m-2. The diversity index of giant clams shows a value ranging from 0–0.97, classified in the low diversity category. The similarity index value of giant clams is classified into the stressed to stable similarity category with values ranging from 0–0.97. The dominance index value of giant clams is classified in the medium to high dominance category with values ranging from 0.52 to 1. The distribution pattern of the two giant clam species found in the waters of Aceh Besar District has a uniform distribution pattern with values ranging from 0.20–0.29. The overall population structure of Tridacnidae is in unstable condition.

scholarly journals KEANEKARAGAMAN JENIS TUMBUHAN PAKU-PAKUAN (PTERIDOPHYTA) DAN KONDISI TEMPAT TUMBUHNYA PADA HUTAN RAWA GAMBUT SEKUNDER DAN LAHAN GAMBUT TERBUKA

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Furwoko Kirno ◽  
Dwi Astiani ◽  
Hanna Artuti Ekamawanti
Keyword(s):  
Species Diversity ◽  
Diversity Index ◽  
Similarity Index ◽  
Survey Method ◽  
Site Conditions ◽  
Swamp Forest ◽  
Peat Swamp Forest ◽  
Plot Size ◽  
Peat Swamp ◽  
Index Value

The activities of the community around the peat swamp forest cause disruption of the ecosystem from the sustainability of the forest area's resources. Land clearing and peatland fires also affect the presence of ferns. The new environmental conditions due to changes in land cover cause ferns to be affected by these changes. Kuala Dua Village Kubu Raya Regency has secondary peat swamp forest and open peat land due to fires 3-4 years earlier so it is overgrown with a variety of new types of flora, one of which is a type of fern. The objective of the study is to describe species diversity of ferns and their site conditions in secondary peat swamp forests and open peatlands of Kuala Dua Village, Kubu Raya District. This research was conducted with survey method using multiple plot samples. The plots determination was done by purposive sampling which was taken place on the site where there were many species of ferns land. Three plots were on each land covered condition with a plot size of 5 m x 5 m that divided into 25 of a 1 m x 1 m sub plots. The results show that 5 species of ferns found in peat swamp forest and 4 species of ferns were found on open peatlands. The species that has the highest INP value in the forest was Asplenium belangeri and the species that has the INP value in open peatland was Nephrolefis falcata. Dominant Index, Spesies Diversity Index and Spesies Abudance Index were 0,12 and 0,18; 0,30 and 0,36; 0,51 and 0,52 on the forest and open peatland respectively. The Similarity Index value (IS) of ferns in secondary peat swamp forest and open peatland is 44%. The study shows dissimility of species fern in peat swamp forests and open peatlands.Keywords: Open peatland, Pteridophyta, secondary peat swamp forest

scholarly journals KEANEKARAGAMAN KEPITING BIOLA PADA KAWASAN HUTAN MANGROVE DESA KARIMUNTING KECAMATAN SUNGAI RAYA KEPULAUAN KABUPATEN BENGKAYANG

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Hanafi Hanafi ◽  
M Sofwan Anwari ◽  
Ahmad Yani
Keyword(s):  
Fiddler Crab ◽  
Diversity Index ◽  
Species Abundance ◽  
Similarity Index ◽  
Sampling Technique ◽  
Fiddler Crabs ◽  
Species Diversity Index ◽  
Transect Line ◽  
Species Similarity ◽  
Index Value

Karimunting Village is a coastal area that has a mangrove with contained several faunas in it, one of which is a fiddler crab. The fiddler crab is a Decapoda ordo and it is included in the Ocypodidae family. This study aims to collect data on the diversity of fiddler crabs in Karimunting Village. The method used in this study is a survey, while the sample is collected by applying the transect line with a purposive sampling technique. The transect line is 500 m length, with a total of three lanes. There are ten plots of 1x1 meter in size in each transect lines to pick up fiddler crabs. Fiddler crabs species were found in 6 species, namely Uca paradussumieri, Uca annulipes, Uca forcipata, Uca rosea, Uca crassipes and Uca tetragonon. The Shannon-Winner species diversity index (H') of fiddler crabs in 1st and 2nd lanes both are categorized medium, while in the 3rd lane is categorized low. The range of values H'=0,3-1,5. The value of species abundance index (Xi) ranges from 3-16.6 ind/m2. The value of evenness index (e) ranges from 0,72 to 0,84. The dominance index value (C) ranges from 0,3 to 0,5 categorized as the absence of the dominant species of fiddler crab. Comparison of species similarity index (IS) for each lane is categorized differently, for the 1st and 2nd lane the index is 91% and categorized as having high species similarity, then in 2nd and 3rd lane the index is 75% and categorized as having a medium species similarity, whereas the index for 1st and 3rd is 60%, therefore it is categorized as having low species similarity.Keyword: Diversity, Fiddler Crab, Karimunting Village

scholarly journals Composition And Diversity Of Plant Species In The Two Types Of Land Cover Of Natural Laboratory Of Hampangen Educational Forest

2021 ◽  
Vol 15 ◽  
pp. 123-134
Author(s):  
Sosilawaty Sosilawaty ◽  
Belinda Hastari ◽  
Ricardo Siregar
Keyword(s):  
Land Cover ◽  
Plant Species ◽  
Life Support ◽  
Diversity Index ◽  
Similarity Index ◽  
Land Cover Type ◽  
Swamp Forest ◽  
Combination Technique ◽  
Cover Type ◽  
Index Value

Forests are natural resources that contribute to sustaining life support systems. The purpose of this study was to determine the composition and diversity of plant species in the Hampangen Educational Forest Nature Laboratory with the object of research on plant species diversity at growth rates of seedlings, poles, saplings, and trees in the observation plots of secondary swamp forest and swamp scrub. The research was conducted using a combination technique of paths and checkered lines in each of the 30 measurement plots in the two types of observation land. The results showed 52 types of plants found in all types of research land—a total of 42 species in secondary swamp forest and 26 species in scrublands. The types of plants that occupy the highest IVI at all growth levels are Akasia, Jambu-jambu, and Meranti. The Diversity Index of plant species in the study area on both land types was classified as moderate, namely in the range 1,871 - 2,968. The evenness index value (E) of plants in the land cover type of secondary swamp forest and swamp scrub was classified as high in the range of 0.753 - 0.849. The Species Richness Index (R) value of the secondary swamp forest land cover type is classified as high, whereas the swamp scrub land cover type is classified as low, while the average species similarity index in the two land cover types is low.

scholarly journals PERBANDINGAN STRUKTUR DAN KOMPOSISI MAKROALGA DI PANTAI DRINI DAN PANTAI KRAKAL

2020 ◽  
Vol 13 (2) ◽  
pp. 75-86
Author(s):  
Lukman Aziz ◽  
Abdul Razaq Chasani
Keyword(s):  
Random Distribution ◽  
Diversity Index ◽  
Similarity Index ◽  
Distribution Patterns ◽  
Ulva Lactuca ◽  
Morphological Description ◽  
Dominance Index ◽  
Importance Index ◽  
Index Value ◽  
Important Value Index

ABSTRACTDrini and Krakal Beach are two beaches in the Gunungkidul area which are crowded with visitors. The high human activity, directly and indirectly will affect marine organisms in the region, one of them is macroalgae. The purpose of this study is to find out information on diversity and distribution patterns of macroalgae in the Drini and Krakal Coast waters. Data was collected on 15 -17 September 2019. The method used in sampling is the quadratic transect method using a 1x1 m grid plot. At each location 25 plots were taken and then the data were analyzed in the form of important value index, diversity index, similarity index, dominance index and distribution patterns. Morphological description was also carried out for the characterization and manufacture of herbarium for sample identification. For identification, the method used was to compare samples with photographs, sketches, herbarium and descriptions from identification books. Macroalgae found in both locations consisted of 29 species, 23 genera, 21 families, 14 orders and 3 classes. The highest diversity is found in Rhodophyta phyla with 17 species and phylum with the lowest diversity is Heterokontophyta with four species. Drini Beach has a diversity index value and a higher similarity index compared to Krakal Beach. While the dominance index is higher in Krakal Beach. The species with the highest importance index in both locations is Ulva lactuca. On Drini Beach there are 14 species with random distribution patterns and 7 species with cluster distribution patterns while on Krakal Beach there are 16 species with random distribution patterns and 3 species with clumped distribution patterns.Keywords: Distribution Pattern, Diversity, Gunungkidul, Marine MacroalgaABSTRAKPantai Drini dan Krakal merupakan dua pantai diwilayah Gunungkidul yang ramai pengunjung. Tingginya aktifitas manusia, secara langsung manupun tidak langsung akan mempengaruhi organisme laut yang ada di wilayah tersebut, salah satunya makroalga. Tujuan dari penelitian ini adalah untuk mengetahui informasi keanekaragaman dan pola distribusi makroalga yang berada di wilayah perairan pantai Drini dan Pantai Krakal. Pengambilan data dilakukan pada 15-17 September 2019. Metode yang digunakan dalam pengambilan sampel yaitu metode transek kuadrat dengan menggunakan grid plot 1x1 m. Pada setiap lokasi diambil 25 plot kemudian dianalisis datanya berupa indeks nilai penting, indeks keanekaragaman, indeks kesamaan, indeks dominansi dan pola distribusi. Selain itu juga dilakukan deskripsi morfologi untuk karakterisasi dan pembuatan herbarium untuk identifikasi sampel.Untuk identifikasi, metode yang digunakan adalah dengan membandingkan sampel dengan foto, sketsa, herbarium dan deskripsi dari buku identifikasi. Makroalga yang ditemukan di kedua lokasi terdiri dari 29 spesies, 23 genus, 21 famili, 14 ordo serta 3 kelas. Keanekaragaman tertinggi terdapat pada filum Rhodophyta dengan 17 spesies dan filum dengan keanekaragaman terendah yaitu Heterokontophyta dengan empat spesies. Pantai Drini memiliki nilai indeks keanekaragaman dan indeks kesamaan yang lebih tinggi dibandingkan dengan Pantai Krakal. Sedangkan indeks dominansi terhitung lebih tinggi di Pantai Krakal. Spesies dengan indeks nilai penting tertinggi di kedua lokasi yaitu Ulva lactuca. Di Pantai Drini terdapat 14 spesies dengan pola distribusi acak dan 7 spesies dengan pola distribusi mengelompok sedangkan di Pantai Krakal terdapat 16 spesies dengan pola distribusi acak dan 3 spesies dengan pola distribusi mengelompok.Kata kunci: Pola Distribusi, Keanekaragaman, Gunungkidul, Makroalga laut

scholarly journals SPECIES DIVERSITY AND DISTRIBUTION OF SPONGES IN THE COASTAL AREA OF KASIAK ISLAND PARIAMAN REGENCY SUMATERA BARAT PROVINCE

2020 ◽  
Vol 2 (2) ◽  
pp. 162-169
Author(s):  
Nahdya Nasri Ananda ◽  
Efriyeldi Efriyeldi ◽  
Thamrin Thamrin
Keyword(s):  
Distribution Pattern ◽  
Diversity Index ◽  
Survey Method ◽  
Research Station ◽  
Frequency Of Occurrence ◽  
Dominance Index ◽  
Bottom Waters ◽  
Density Values ◽  
Belt Transect ◽  
Index Value

Sponges are the most primitive multicellular animals that live in various types of waters from freshwater, brackish and sea. Sponges live in bottom waters that typically stick themselves on hard substrate such as rock or coral and compete with other tacks organism to obtain a food hall. The research was conducted in Kasiak Island Pariaman regency West Sumatera in February-March 2019, aims to find outthe type, density, frequency of occurrence, diversity index, dominance index, the distribution pattern of sponge, To support the research data is also observed the characteristics of the environment such as water quality. The method used is survey method, where sampling using belt transect method performed on three stations. The research found 14 genus / species of sponge consisting of 11 families in island waters Kasiak with sponge density values obtained in each research station ranges from 1458-4208 ind / ha. The highest frequency of occurrence of the type Jaspis sp. with the frequency of occurrence of 100%. Diversity index values ranged from 1.8921 to 1.9488, dominance index value obtained was from 0.3163 to 0.3396, and the value of the distribution pattern of the sponge ranges from 0.2941 to 0.3015.

scholarly journals Distribution patterns and population structure of salagundi (Rhodoleia teysmanii) From North Tapanuli-North Sumatra

2021 ◽  
Vol 912 (1) ◽  
pp. 012078
Author(s):  
K S Hartini ◽  
A Susilowati ◽  
M Rizky
Keyword(s):  
Population Structure ◽  
Distribution Pattern ◽  
Distribution Patterns ◽  
Tree Level ◽  
Vegetation Analysis ◽  
Analysis Techniques ◽  
Home Construction ◽  
Excessive Consumption ◽  
Index Value ◽  
North Sumatra

Abstract North Sumatra known as bigger island with abundant of tropical tree species. Some of those were lesser known species. One of lesser-known and potential species from North Sumatera is Salagundi (Rhodoleia teysmanii). Despite being widely utilized by locals peoples, information on Salagundi’s population and other characteristics is very limited. The community in the surrounding area frequently uses wood for a variety of functions, such home construction. Excessive consumption potentially threatent the species’ existence in the habitat. Therefore, this study aims to determine the distribution pattern and population structure of Salagundi in Simorangkir Julu Village, Siatas Barita District, North Tapanuli Regency, North Sumatra Province. For those purpose, vegetation analysis techniques using a combination of plotted lines and lines were adopted. Result of this research showed that, distribution pattern of Salagundi at the seedling to tree level was clumped with the Morisita (Ip) index value of 0.51 -0.53. The population structure curve was the J-shaped reversed. This shows that the condition of the population is sustainable.

scholarly journals Fenomena Harmful Algal Blooms (HABs) di Pantai Ringgung Teluk Lampung, Pengaruhnya dengan Tingkat Kematian Ikan yang Dibudidayakan pada Karamba Jaring Apung

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
Ade Irawan ◽  
Qadar Hasani ◽  
Herman Yuliyanto
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Diversity Index ◽  
Wild Fish ◽  
Anthropogenic Sources ◽  
Fish Mortality ◽  
Phytoplankton Diversity ◽  
Algal Abundance ◽  
The Individual ◽  
Index Value

Fish mortality in the Bay of Lampung not only wild fish, but also fish farmed in cages, especially Ringgung Beach. One which caused by harmful algal abundance that occur was increased input contaminants by both natural and anthropogenic sources. This study aims to analyze the influence of harmful algal blooms (HABs) the amount and frequency of fish mortality in cage Ringgung Lampung Bay. The study was conducted at three research stations based KJA density. The results of the study found 33 species of phytoplankton, 14 species have potential as HABs can cause the death of fish. The highest abundance was kind Cochlodinium that reach 63.738 cells/liter. Phytoplankton diversity index value with the lowest value occurred at station 3 on June 19, 2013 ie the date of 0705. The highest phytoplankton diversity values occurred at Station 2 on June 12, 2013 is 2,451. Uniformity values of phytoplankton in the waters of Beach Ringgung obtained in the high category with a value above 0.5 or close to 1, which indicates that the spread of the individual any kind of relatively evenly. Except at station 3 which has a relatively low value (0.228 on June 19, 2013, 0291 on June 26, 2013, and 0446 on July 3, 2013). Effect of HABs on the fishing mortality rate is indicated by regression analysis. Correlation coefficient at station 1 shows the value of 0.5208. While on station 2 shows 0.6937. Harmful algal blooms shown to affect mortality rates of fish in floating net Ringgung Beach. They have triggered reduced oxygen levels in the water that could potentially cause the death of wild fish and farmed in floating net Keywords: Dead fish, harmful phytoplankton, floating net

scholarly journals Coral Reef Fishes Biodiversity In Pahawang Island,Pesawaran District Lampung

AQUASAINS ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 887
Author(s):  
Darma Yuliana ◽  
Ayu Rahmasari ◽  
Herman Yulianto ◽  
Abdullah Aman Damai
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Diversity Index ◽  
Similarity Index ◽  
Reef Fishes ◽  
Coral Reef Fishes ◽  
Line Transect ◽  
Marine Tourism ◽  
Reef Health

The components of coral reef ecosystem can be described by the unique regulation in community level. Coral reef fishes use coral reef as their habitat and they highly depend on coral reef health. Otherwise, the condition of coral reef health can be predicted by the biodiversity of coral reef fishes. The research aim was describe communities differences between two explored area in marine tourism spots in Pahawang Island. This research was conducted on November 2019 at two stations on the coral reefs ecosystem of Pahawang Island represented the two quitely different area, the marine tourism and the visitor areas.  The coral reef fishes were observed by using visual census method with a Line Transect length of 30 meters and a visibility of 2.5 meters left and right of the transect.  Coral reef fish community structure was measured by diversity, similarity, and dominancy indexes. A total of 1.940 coral reef fish species from 13 families were recorded. Pomacentridae is the most speciose family (1.091 species), followed by Siganidae (308 species) and Labridae (166 species). Biodiversity of coral reef fishes at Pahawang Island showed results diversity index (H') in both observation stations classified as medium with a low dominance index value (C) and similarity index (E)  at both stations classified as high, presumably as a result of tourism activities. The diversity index at station 2 has a greater value than station 1 as a tourist area with diving and snorkeling tourism activities, at station 2 there are more types or genus of reef fish, compared to station 1.

scholarly journals DIVERSITAS SEMUT (Hymenoptera : Formicidae) PADA LAHAN GAMBUT DI DESA KUALA DUA KABUPATEN KUBU RAYA

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Destri Hardianti ◽  
Hari Prayogo ◽  
Yuliati Indrayani
Keyword(s):  
Leaf Litter ◽  
Diversity Index ◽  
Similarity Index ◽  
Social Animals ◽  
On Line ◽  
Insect Predators ◽  
Index Value ◽  
Ant Diversity ◽  
Observation Path ◽  
High Diversity

Secondary peatlands located in Kuala Dua Village, Kubu Raya Regency have various types of insects, one of which dominates is ants. Ants are members of the Order of Hymenoptera which have high diversity and complexity as social animals. Ants play a role in spreading seeds, other insect predators, spore spreaders, decomposers, ecological controllers. Information about the diversity of ants in Kubu Raya Regency is still very limited, especially those on peat land in Kuala Dua Village, Kubu Raya District, therefore research on ant diversity needs to be done with the aim to record the diversity of ants on these peatlands. Laying down the observation path is done intentionally (Purposive sampling). The method used is hand collecting and leaf litter sifting. The results shows that seven genera and four subfamily were obtained. Subfamily found is Formicinae, Ponerinae, Myrmicinae, and Dolichoderinae. The Subfamily Formicinae consists of the genus Camponotus, Colobobsis, Polyrhachis, Anoplolepis. The Ponerinae subfamily consists of the genus Leptogenys. Subfamily Myrmicinae consists of the genus Pheidole. The Dolichoderinae subfamily consists of the genus Ecphorella. The diversity index value on line 1 (1.30) is classified as medium category, line 2 (0.80) is classified as low category and line 3 (0.34) is classified as low category. The abundance index on line 1 (0.80) is classified as high category, line 2 (0.73) is classified as low category, line 3 (0.50) is classified as low category. The similarity index of ant species on line 1 and line 2 are (25%) which classified as low category. Line 1 and 3 are (57.14%) classified as medium category. The similarity index of ant species on line 2 and 3 (40%) were also classified as medium category.Keywords: ants, diversity, Kubu Raya District, peat land.

scholarly journals Diversity and population structure of Dipterocarpaceae species in Weh Island Nature Tourism Park, Indonesia

2021 ◽  
Vol 21 (2) ◽  
pp. 99-104
Author(s):  
RIDHA UL FAHMI ◽  
SAIDA RASNOVI ◽  
ESSY HARNELLY
Keyword(s):  
Population Structure ◽  
Species Diversity ◽  
Stand Structure ◽  
Diversity Index ◽  
Species Abundance ◽  
Major Effect ◽  
Data Availability ◽  
Nature Tourism ◽  
Plant Groups ◽  
Index Value

The Dipterocarpaceae family is one of the identified plant groups with high conservation value that exist in Weh Island Nature Tourism Park. However, the data availability on the species diversity and population structure of Dipterocarpaceae in Weh island in particular and Aceh in general is still very limited. Thus, it is necessary to conduct studies on species diversity and population structure of Dipterocarpaceae from Weh Island. This study aims to obtain data on species abundance and diversity, species composition of each stratum, population structure, and stand structure of Dipterocarpaceae in Weh Island Nature Tourism Park. This research utilized transect method with randomly selected plots according to topographic conditions. We found two Dipterocarpaceae species: Shorea sumatrana (Slooten) Desch and Dipterocarpus hasseltii Blume. Shorea sumatrana (Slooten) Desch has the greatest abundance of all types and strata. The diversity of Dipterocarpaceae species in Weh Island Nature Tourism Park is categorized as low because the diversity index value is in the range of H'1. This means that the presence of seedling and sapling strata from each species has a major effect on the survival of the Dipterocarpaceae family in the future. The stand structure of the Dipterocarpaceae family in normal conditions is indicated by an inverted “J” shaped diagram.

Sign in / Sign up

Export Citation Format

Share Document