Effect of Environmental Factors on The Relative Fitness and Spatial Distribution of Mangrove Crabs (Scylla spp) in Blok Bedul Segoro Anak, Alas Purwo National Park, Indonesia

The mangrove forest are natural and renewable. resources Mangrove has the physical, chemicaland biological function which highly support the fulfillment of human needs and serve as a bufferbalance of the ecosystem in coastal areas. One of the functions associated with the mangrovebiological existence as a source of diversity of marine life. Marine life is affected by the presenceof mangrove forests among mangrove crab (Scylla serrata) to maintain the ecological balance andcause the energy cycle running fast. This study aims to determine the condition of environmentalfactors, the relative fitness and spatial distribution of mangrove crabin the mangrove forests BlockBedul Kali Segoro Alas Purwo National Park. Data from the study are described and classified bysimilarity of environmental factors, then performed multiple linear regression betweenenvironmental factors with relative fitness and spatial distribution of mangrove crabs. The resultsshowed that the average relative fitness mangrove crabs at all the research station is 69 with astandard deviation of 13.51. Spatial distribution of mangrove crab at any observation station isless than 1, so it can be concluded that the distribution is uniform. Environmental factors withrelative fitness mud crab significant correlation, but no significant correlation betweenenvironmental factors with the spatial distribution of mangrove crabs. Keywords: Relative Fitnes Crab Mangrove, Mangrove Crab Spatial Distribution, Alas Purwo National Park

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The Influence of Abiotic Factors on The Diversity and Abudance of Mangrove Crabs (Scylla spp.) in Blok Bedul Alas Purwo National Park Mangrove Forest

Jurnal ILMU DASAR ◽

10.19184/jid.v16i2.1517 ◽

2016 ◽

Vol 16 (2) ◽

pp. 63

Author(s):

Rina Sugiarti Dwi Gita ◽

Sudarmadji Sudarmadji ◽

Joko Waluyo

Keyword(s):

National Park ◽

Diversity Index ◽

Abiotic Factors ◽

Research Station ◽

Mangrove Forests ◽

Mud Crab ◽

Species Diversity Index ◽

Mangrove Crab ◽

Crab Abundance ◽

Mud Crabs

The purpose of this study was to determine the diversity, abundance and abiotic factors influence the diversity and abundance of mud crab (Scylla spp.) In mangrove forests Blok Bedul Alas Purwo National Park. This research method uses descriptive quantitative method. Diversity is calculated by using the formula of Shannon Wiener, mangrove crab abundance is calculated using the formula abundance Kreb whereas the method of analysis using simple linear regression. The data used in this research is data such as the number and type of biotic mud crabs and data abiotic form of measurement of temperature, pH, salinity, substrate type, and the tide. This study shows the results include mangrove crab species diversity index of every observation stations in the mangrove forests Blok Bedul Alas Purwo National Park is H '= 0.315 showing that the level of diversity in every station is low. The abundance of mud crabs in the mangrove forests Blok Bedul Alas Purwo National Park is 0.0011 individuals / m² which showed that the level of abundance at relatively low research station. Results of the analysis of the influence of abiotic factors on the diversity and abundance of mud crabs in mangrove forests Blok Bedul National Park Alas Purwo not significant (p> 0.05) the diversity and abundance of mangrove crab. Keywords : abiotic factors , abundance , diversity , mud crab , regression

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Distribusi Scylla spp. di perairan estuari Sungai Donan Segara Anakan Bagian Timur, Cilacap

Habitus Aquatica ◽

10.29244/haj.2.1.1 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Sulistiono Sulistiono ◽

Nurul Musyariafah Yahya ◽

Etty Riani

Keyword(s):

Economic Value ◽

Scylla Serrata ◽

Mangrove Forests ◽

Mud Crab ◽

Mangrove Species ◽

Central Java ◽

Rhizophora Apiculata ◽

Mangrove Ecosystems ◽

Avicennia Alba ◽

Mangrove Crabs

Mangrove forests are ecosystems that make up coastal areas and river estuaries. The examples of mangrove ecosystems found in Indonesia are in Segara Anakan, Central Java. One of the aquatic biota with the economic value found in the mangrove forest ecosystem is the mud crab (Scylla spp.). The purpose of this study was to assess the distribution of mangrove crabs (Scylla spp.) to the presence of mangrove species in the mouth of the Donan River, Segara Anakan. A sampling of crabs and observations of mangrove vegetation were carried out at five stations spread from the river to the sea. The results showed that there were three types of mangrove crabs caught in the vicinity of the study, namely Scylla tranquebarica, S. olivacea, and S. serrata. The types of mangroves found include Rhizophora apiculata, R. mucronata, Avicennia rumphiana, A. alba, A. officinalis, and Nypa. Regression analysis showed that mangrove density correlated with the abundance of Scylla tranquebarica and Scylla olivacea, but contradicts the abundance of Scylla serrate. PCA analysis showed that the Crab species Scylla tranquebarica and Scylla olivacea were associated with mangroves of Avicennia alba, Avicennia rumphiana, and Rhizophora apiculata. Meanwhile, Scylla serrata crabs are associated with Avicennia officinalis.

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The population and mortality characteristics of mangrove crab (Scylla serrata) in the mangrove ecosystem of Tarakan City, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210855 ◽

2020 ◽

Vol 21 (8) ◽

Author(s):

AGUS INDARJO ◽

Gazali Salim ◽

MUFRIDA ZEIN ◽

DODDY SEPTIAN ◽

STEPHANIE BIJA

Keyword(s):

Carapace Length ◽

Total Mortality ◽

Condition Index ◽

Mangrove Ecosystem ◽

Scylla Serrata ◽

Primary Data ◽

Allometric Growth ◽

Male And Female ◽

Mangrove Crab ◽

Mangrove Crabs

Abstract. Indarjo A, Salim G, Zein M, Septian D, Bija S. 2020. The population and mortality characteristics of mangrove crab (Scylla serrata) in the mangrove ecosystem of Tarakan City, Indonesia. Biodiversitas 21: 3856-3866. The mangrove crab is an iconic species of Tarakan City and is often is used as a souvenir. However, the high demand for this species can cause its population to decline. This study aimed to characterize the mangrove crab (Scylla serrata) population in the mangrove ecosystem of Tarakan City, North Kalimantan, Indonesia. This study was designed using a quantitative descriptive method with a case study model. The samples of mangrove crabs were obtained from 6 different stations using a purposive sampling method. The mangrove crab specimens were caught using 35-50 units of crab traps known as the ambau brackets. The primary data included carapace length, carapace width, carapace thickness, sex, and the total weight of each mangrove crab specimen. The results showed that male mangrove crabs have positive allometric growth when the condition index was fat. However, female crabs exhibited negative allometric growth when the condition index was thin. The Von Bertalanffy growth model analysis showed that the maximum carapace length of male mangrove crab in the mangrove ecosystem of Tarakan City was approximately 11.1118 cm for 189 days, while the female length was 9.6474 cm for 80 days. The total mortality value of male and female crabs was 120.01% and 154.94%, the mortality due to fishing was 84.69% and 135.75%, and natural mortality was 35.32% and 19.2%, respectively. The estimated rate of exploitation of both male and female crabs was 70.57% and 87.61%, respectively. The exploitation of S. serrata in the mangrove ecosystem of Tarakan City was evident, hence, conservation efforts are urgently required.

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Pengaruh ekstrak minyak cumi pada umpan bubu terhadap hasil tangkapan kepiting bakau dan rajungan di Perairan Malise Kecamatan Tabukan Tengah

JURNAL ILMU DAN TEKNOLOGI PERIKANAN TANGKAP ◽

10.35800/jitpt.2.3.2016.11449 ◽

2016 ◽

Vol 2 (3) ◽

Author(s):

Maichel Arvan Pananggung ◽

Ivor L. Labaro ◽

Emil Reppie

Keyword(s):

Coastal Waters ◽

Scylla Serrata ◽

Fishing Gear ◽

Swimming Crab ◽

Portunus Pelagicus ◽

Mangrove Crab ◽

Gill Net ◽

Oil Extract ◽

Mangrove Crabs ◽

By Catch

ABSTRACT Mangrove crab (Scylla serrata) and swimming crab (Portunus pelagicus) are economically important marine commodities produced from the coastal waters of Sangihe Islands Regency. But those marine commodity products are usually only caught accidentally with a bottom gill net. There has been a special trap fishing gear for that resources, but not known well by local fishermen. Addition of squid oil extraction baits could increase the fishing power of mangrove crab and swimming crab traps. This research aims to study the effect of squid oil extract on traps bait to catch mangrove crab and swimming crab; and identify the types of biota captured. This research was done in coastal waters of Malise village, Tabukan Tengah District of Sangihe Islands Regency for 2 weeks September 2015; based on experimental method. Six unit traps were operated ten trips where three units of them used scad mackerel bait that injected with squid oil extract, and tree other units just used scad mackerel bait without extract; and the capture data were analyzed using t test. The catch was 142 individuals (135 mangrove crabs and 7 swimming crab); where 86 crabs was caught by scad mackerel bait with squid oil extract, and 56 crabs caught with bait without squid oil extract. The analysis showed that the use of squid oil extracts on trap baits increased the catch. Keywords: mangrove crab, swimming crab,trap baits, squid oil extract, Sangihe ABSTRAK[1] Kepiting bakau (Scylla serrata) dan rajungan (Portunus pelagicus) merupakan komoditi hasil laut ekonomis penting yang dihasilkan dari perairan pantai Kabupaten Kepulauan Sangihe. Tetapi komoditi hasil laut tersebut biasanya hanya tertangkap tanpa sengaja (by catch) dengan jaring insang dasar. Sebenarnya telah ada alat tangkap bubu khusus untuk kepiting bakau dan rajungan, tetapi belum dikenal oleh nelayan lokal. Pemberian ekstrak minyak cumi pada umpan, diduga dapat meningkatkan kemampuan tangkap dari bubu kepiting bakau dan rajungan. Penelitian ini bertujuan untuk mempelajari pengaruh ekstrak minyak cumi pada umpan bubu terhadap hasil tangkapan kepiting bakau dan rajungan, dan mengidentifikasi jenis-jenis biota yang tertangkap. Penelitian ini dilakukan di perairan Malise Kecamatan Tabukan Tengah, Kabupaten Kepulauan Sangihe; selama 2 minggu pada bulan September 2015; yang didasarkan pada metode eksperimental. Enam unit bubu dioperasikan selama sepuluh trip untuk mengumpulkan data; di mana tiga unit menggunakan umpan ikan layang yang disuntikan ekstrak minyak cumi, dan tiga unit lainnya hanya menggunakan umpan ikan laying tanpa ekstrak; dan data dianalisis dengan uji t. Tangkapan total berjumlah 142 ekor (135 ekor kepiting bakau dan 7 ekor rajungan); di mana 86 ekor tertangkap dengan umpan layang yang diberi ekstrak minyak cumi, dan 56 ekor tertangkap dengan umpan tanpa ekstrak. Hasil analisis menunjukkan bahwa penggunaan ekstrak minyak cumi pada umpan bubu, memberikan hasil tangkapan yang sangat berbeda dibandingkan dengan umpan tanpa ekstrak minyak cumi. Kata-kata kunci: kepiting bakau, rajungan, umpan bubu, ekstrak minyak cumi, Sangihe

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KAJIAN RESIKO KEPITING BAKAU (Scylla serrata) DI ESTUARI MAHAKAM, KALIMANTAN TIMUR

Jurnal Penelitian Perikanan Indonesia ◽

10.15578/jppi.25.1.2019.15-26 ◽

2019 ◽

Vol 25 (1) ◽

pp. 15

Author(s):

Aisyah Aisyah ◽

Setiya Triharyuni ◽

Eko Prianto ◽

Husnah Husnah

Keyword(s):

Natural Resource ◽

Scylla Serrata ◽

Risk Level ◽

Mud Crab ◽

Susceptibility Analysis ◽

Fish Resources ◽

Mangrove Crab ◽

Medium Level ◽

Mangrove Crabs ◽

Ecosystem Changes

Kawasan estuari merupakan wilayah yang kaya akan unsur hara di daerah pantai. Perubahan ekosistem pantai, seperti terjadinya pendangkalan menyebabkan penurunan luasan mangrove. Dampak yang terjadi merupakan penyumbang bagi kerentanan sumberdaya kepiting bakau di daerah tersebut. Tujuan penelitian ini adalah untuk mengetahui tingkat resiko potensi kerentanan sumber daya kepiting bakau dan keberlanjutannya di estuari Sungai Mahakam Kalimantan Timur. Analisis kerentanan menggunakan perangkat lunak PSA (Productivity and Susceptibility Analysis). Hasil analisis menunjukkan bahwa potensi kepiting bakau di Eestuari Mahakam mempunyai kerentanan tingkat rendah (tingkat kerentanan =1,3). Nilai produktivitas (kemampuan pulih sumber daya) menunjukan nilai yang lebih tinggi (2,1) dari pada nilai susceptabilitas (tingkat resiko sumber daya ikan terhadap aktivitas perikanan di perairan tersebut) yaitu 1,9. Dengan kondisi tersebut maka peluang keberlanjutan ketersediaan kepiting bakau di estuari Mahakam berada dalam tingkat sedang.Estuaries constitute an extremely valuable natural resource in the coastal areas. The coastal ecosystem changes such as deforestation of the estuarine caused the decrease of mangrove forestry. These impacts directly contribute to the vulnerability of mud crab resources. The purpose of this research was to determine the risk level of potential vulnerability of mangrove crab resources in the Mahakam estuary. Vulnerability analysis using Productivity and Susceptibility Analysis (PSA) software. The results showed that mangrove crabs in the Mahakam estuary were low vulnerable (vulnerability level of 1.3). Value of productivity (the ability to recover resources) higher than susceptibility (level of risk of fish resources to fisheries activities in those areas). It, means that the chances for sustainability of mangrove crab in Mahakam estuary were medium level.

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Growth Potential of Mangrove Crab (Scylla serrata) in Mantehage Island Waters, Bunaken National Park, North Sulawesi

JURNAL ILMIAH PLATAX ◽

10.35800/jip.3.1.2015.13213 ◽

2015 ◽

Vol 3 (1) ◽

pp. 1

Author(s):

Joudy R. R Sangari ◽

Boyke H. Toloh

Keyword(s):

Coastal Waters ◽

National Park ◽

Carapace Width ◽

Temporal Distribution ◽

B Value ◽

Growth Potential ◽

Scylla Serrata ◽

North Sulawesi ◽

Mangrove Crab ◽

Range Of Values

Scylla serrata is one of the dominant muddy crabs caught in Mantehage Island coastal waters, North Sulawesi. The study was aim to determine the temporal distribution of S. serrata condition i based on carapace length - weight relationship and its condition factors. Data carapace width and weight of muddy crabs collected by enumerators from Oktober 2014 to April 2015. The results showed that b value of male (2.219 – 2.835) and female (1.264-2.352) were significantly different (P<0.05). Male and female crabs have a negative allometric growth pattern with b value of males tend to be larger than females. Range of values for K and Kn male crabs longer than females that male crabs tend to be fatter. Temporal distribution of this mangrove crab condition factors is assumed to be related with the reproductive cycle. The value is increasing since October to a peak season in January which estimated related to a peak of the muddy crabs spawning season in Mantehage Island coastal waters. Key words: growth potential, Mantehage Island coastal waters, Scylla serrata _____________________________________________________________________ 1Staf Pengajar Fakultas Perikanan dan Ilmu Kelautan UNSRAT A b s t r a k Scylla serrata merupakan salah satu jenis kepiting bakau yang dominan tertangkap di perairan Pulau Mantehage Sulawesi Utara. Penelitian ini bertujuan untuk mengetahui potensi pertumbuhan kepiting bakau ditinjau dari hubungan panjang karapas dengan berat. Data panjang karapas dan berat kepiting bakau dikumpulkan melalui nelayan setempat sebagai enumerator sejak Oktober hingga April 2015. Hasil menunjukkan nilai b antara kepiting jantan (2,219 – 2,835) dan betina (1,264 - 2,352) berbeda nyata (P<0,05). Keduanya memiliki pola pertumbuhan allometrik negatif dengan nilai b kepiting jantan cenderung lebih besar dibandingkan betina. Kisaran nilai K dan Kn menunjukkan kepiting jantan lebih panjang dibandingkan betina sehingga kepiting jantan cenderung lebih gemuk. Sebaran faktor kondisi kepiting bakau diduga terkait dengan siklus reproduksinya. Nilai faktor kondisi meningkat sejak bulan Oktober 2014 hingga puncaknya pada bulan Januari 2015yang diduga pada saat tersebut merupakan puncak musim pemijahan kepiting bakau di perairan P. Mantehage. Kata kunci: potensi pertumbuhan, perairan P. Mantehage, Scylla serrata

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Ekosistem mangrove sebagai habitat kepiting bakau (Scylla Serrata) di Kampung Nipah Desa Sei Nagalawan Kecamatan Perbaungan Serdang Bedagai Provinsi Sumatera Utara

DEPIK ◽

10.13170/depik.7.1.8742 ◽

2018 ◽

Vol 7 (1) ◽

pp. 84-90

Author(s):

Sari Marina Saragi ◽

Desrita Desrita

Keyword(s):

Regression Analysis ◽

Correlation Coefficient ◽

Vegetation Structure ◽

High Density ◽

Scylla Serrata ◽

A Value ◽

Mangrove Crab ◽

Mangrove Vegetation ◽

Mangrove Crabs

Highly Utilization of Mangrove field as cultivation field of fish and recreation and tour site by people have big posses to the abundance of Mangrove crab (Scylla serrata) because of mangrove play role as habitats of mangrove crabs. The research was conducted for two months from December 2016 to January 2017. This study aims to see the structure of mangrove vegetation, the abundance of Mangrove Crab and the influence of mangrove vegetation structure on the abundance of Mangrove Crab in Kampung Nipah. The results of this research are Vegetation structure of Mangrove in the station I and II show high density, whereas density in station III wide apart. The abundance of mangrove crab in the station I and II showed the higher result from station III. The Influence of Vegetation Structure of Mangrove and Abundance of Mangrove Crab can be related by using regression analysis Y = 0.0241x + 113.6. The correlation coefficient (r) that value obtained as 0.79 have a meaning the connection between mangrove density and abundance of mangrove crab are rated in the strong category that has a value 79%. The density of Mangrove to 1000 units will rise up the abundance of mangrove crab to 43.5 an individual. Tingginya pemanfaatan mangrove sebagai lahan budidaya ikan dan sebagai wisata rekreasi oleh masyarakat sangat mempengaruhi kelimpahan Kepiting Bakau (Scylla serrata) karena hutan mangrove merupakan habitat bagi Kepiting Bakau. Penelitian ini dilaksanakan selama dua bulan yaitu bulan Desember 2016 sampai Januari 2017. Penelitian ini bertujuan untuk melihat struktur vegetasi mangrove, kelimpahan Kepiting Bakau dan pengaruh struktur vegetasi mangrove terhadap kelimpahan Kepiting Bakau di Kampung Nipah. Hasil dari penelitian struktur vegetasi mangrove di stasiun I dan II memiliki kerapatan sangat padat, sedangkaan kerapatan di stasiun III jarang. Kelimpahan Kepiting Bakau di Stasiun I dan II lebih tinggi dari kelimpahan di stasiun III. Pengaruh kerapatan mangrove dan kelimpahan Kepiting Bakau diperoleh persamaan regresi yaitu Y = 43,521 + 0,2061x. Koefisien korelasi (r) yang diperoleh 0,79 yang artinya hubungan kerapatan mangrove dan kelimpahan Kepiting Bakau tergolong kuat yaitu sebesar 79%. Kerapatan mangrove sebanyak 1000 satuan akan meningkatkan kelimpahan Kepiting Bakau sebesar 43,5 individu.

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KAJIAN PENDAPATAN NELAYAN KEPITING BAKAU (Scylla serrata) DI KECAMATAN SAMATIGA KABUPATEN ACEH BARAT

JURNAL PERIKANAN TROPIS ◽

10.35308/jpt.v5i1.399 ◽

2018 ◽

Vol 5 (1) ◽

pp. 37

Author(s):

Teuku Amarullah ◽

Syarifah Zuraidah ◽

Gunawan Gunawan

Keyword(s):

Qualitative Analysis ◽

Sampling Method ◽

Scylla Serrata ◽

Research Purpose ◽

Selling Price ◽

Average Amount ◽

Mangrove Crab ◽

Gross Income ◽

Mangrove Crabs ◽

One Year

The research has been conducted on "The Study of Fishermen’s Income of Mangrove Crabs (Scylla serrata) in the Samatiga District of West Aceh Regency". This research purpose is to analyze the income of fishermen’s mangrove crabs and to determine the feasibility of mangrove crab business. In this research, the sampling method by using census, amount of sampling as much as 11 fishermen. To know the level ofthe income in fishermen mangrove crabs in the Samatiga District by using quantitative and qualitative analysis. The average of amount of mangrove crabs production produced by each fisherman in one year is about 689,23 kg with the selling price of Rp. 50.000/kg. The average amount of gross income earned by each fisherman is Rp. 34,461,818 /year and total costas much as Rp 10,112,455/year, then each fisherman earns a profit as much as Rp. 24.349.362 /year, if calculated in per month as much as Rp. 2,029.113 / month. And per day as much as Rp. 78.042 / day. R / C ratio value that is obtained is 3,40 which means such business is feasible or profitable. Keywords: Study, Fishermen's Income, Mangrove Crabs

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Pola Pertumbuhan Kepiting Bakau (Scylla serrata) Di Perairan Desa Bandengan Kendal

Journal of Marine Research ◽

10.14710/jmr.v10i1.28990 ◽

2021 ◽

Vol 10 (1) ◽

pp. 14-22

Author(s):

Nila Munana ◽

Irwani Irwani ◽

Widianingsih Widianingsih

Keyword(s):

Growth Pattern ◽

Full Moon ◽

Carapace Width ◽

Scylla Serrata ◽

Moon Phases ◽

Mangrove Crab ◽

Exploratory Data ◽

New Moon ◽

Mangrove Crabs ◽

Mud Crabs

Kepiting bakau (Scylla serrata) merupakan jenis kepiting yang banyak ditemukan di beberapa daerah, salah satunya di Perairan Desa Bandengan, Kendal. Kepiting bakau setiap harinya ditangkap oleh nelayan, keadaan ini dapat mempengaruhi terhadap populasi kepiting bakau. Fase bulan dapat memberikan pengaruh terhadap kepiting bakau, seperti pada tingkah laku kepiting bakau. Tujuan dari penelitian ini yaitu untuk mengetahui pola pertumbuhan kepiting bakau pada fase bulan mati dan purnama di Perairan Desa Bandengan Kendal. Metode yang digunakan yaitu bersifat deskriptif eksploratif. Pengambilan data dilakukan sebanyak 6 kali periode pada 28 Desember 2019 – 9 Maret 2020, data dari kepiting bakau meliputi panjang karapas, lebar karapas, berat tubuh, jumlah kepiting bakau, dan parameter perairan. Jumlah kepiting bakau yang diperoleh selama penelitian sebanyak 212 ekor bulan mati dan 236 ekor bulan purnama. Hasil penelitian menunjukkan pola pertumbuhan kepiting bakau jantan bulan mati bersifat allometrik positif, sedangkan pada kepiting bakau betina bersifat allometrik negatif. Sedangkan, pada purnama 1 bersifat allometrik positif, bulan purnama 2 dan bulan purnama 3 bersifat allometrik negatif, sedangkan kepiting bakau betina bersifat allometrik negatif. Mud crab (Scylla serrata) is a type of crab that is found in several areas, one of which is in the waters of Bandengan Village, Kendal. Every day mud crabs are caught by fishermen, this situation can affect the mangrove crab population. The moon phase can affect mud crabs, such as the behavior of mud crabs. The purpose of this study was to determine the growth pattern of mud crabs in the new moon and full moon phases in the waters of the village of Bandengan, Kendal. The method used is descriptive exploratory. Data collection was carried out 6 times during the period on 28 December 2019 - 9 March 2020, data from mud crabs included carapace length, carapace width, body weight, number of mangrove crabs, and water parameters. The number of mud crabs obtained during the study was 212 new moons and 236 full moons. The results showed that the growth pattern of male mud crabs in the new moon was positive allometric, while the female mud crabs were negative allometric. Meanwhile, full moon 1 is allometric positive, full moon 2, and full moon 3 allometric negatives, while female mud crabs are allometric negative.

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PENGARUH KARAKTERISTIK HABITAT MANGROVE TERHADAP KEPADATAN KEPITING ( SCYLLA SERRATA ) DI PANTAI UTARA KABUPATEN DEMAK, JAWA TENGAH

Jurnal TAMBORA ◽

10.36761/jt.v5i2.1113 ◽

2021 ◽

Vol 5 (2) ◽

pp. 21-30

Author(s):

Roni Haposan Sipayung

Keyword(s):

Mangrove Ecosystem ◽

Habitat Characteristics ◽

Scylla Serrata ◽

Effect Of Temperature ◽

Mangrove Forests ◽

Vegetation Density ◽

Mangrove Crab ◽

Significant Difference ◽

Mangrove Vegetation ◽

Crab Density

Rehabilitation of mangrove forests is very important to maintain ecosystem stability and increase the productivity of mangrove forests. The success of mangrove forest rehabilitation can be seen by the density of mangrove vegetation and the increase in mangrove crabs. Mangrove crab is the main commodity for farming communities because in addition to playing an important role in the mangrove ecosystem, it also has high economic value so it needs to be developed to increase people's income. This research was conducted with the aim of knowing the density of mangrove vegetation and crab density in different planting years and the effect of mangrove habitat characteristics on crab density. The research was conducted in three different planting years, namely 2003, 2005, and 2006. Each planting year consisted of a front zone, a middle zone and a back zone. In each zone a measuring plot with a size of 5 m x 5 m was made to collect data on vegetation density, temperature, mud thickness, salinity, acidity, and dissolved oxygen (DO). Then in the 5 m x 5 m plot, a 1 m x 1 m plot was made to collect data on the number of crabs. Data analysis used regression equation and ANOVA difference test. The results showed that the highest vegetation density was in the back zone of the 2006 planting year with a density of 2160 individuals/ha, while the highest density of crabs was in the 2005 planting year with a density of 12111.11 individuals/ha. Regression analysis showed the effect of temperature, mud thickness and salinity variables on crab density with the equation Y = 3.447 - 0.044X1 - 0.009X2 - 0.230X3 with R = 0.809. In the different ANOVA test, only the thickness of the mud had a significant difference at three years of planting (0.00 < 0.05).

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