Species diversity and distribution of seagrasses from the South Andaman, Andaman and Nicobar Islands, India

2018 ◽  
Vol 61 (3) ◽  
pp. 225-234 ◽  
Author(s):  
M. Savurirajan ◽  
Jawed Equbal ◽  
Raj Kiran Lakra ◽  
Kunal Satyam ◽  
Ganesh Thiruchitrambalam
Keyword(s):  
Species Diversity ◽  
Fine Sand ◽  
Shoot Density ◽  
The South ◽  
Anthropogenic Pressures ◽  
Thalassia Hemprichii ◽  
Coral Rubble ◽  
Coral Sand ◽  
South Andaman ◽  
Cymodocea Rotundata

AbstractA survey was conducted with the objective to study seagrass distribution, bed size and shoot density in different substrata of the South Andaman Islands. A total of 231 seagrass sites were observed during the study, in which a total of eight species were found. The South Andaman region exhibited the highest species diversity followed by Havelock, Little Andaman and Neil Islands. Eleven continuous seagrass bed were noted during the study which were confined to three different types of substrata: sand only; sand mixed with coral sand and coral rubble; sand mixed with mud.Thalassia hemprichiiandCymodocea rotundatawere found in dense canopies and covered large areas associated with sand and coral rubble.Halophila beccariishowed moderate abundance in muddy substrata andHalodulespp. grew in fine sand. The highest shoot density was recorded at Haddo, followed by Vijaya Nagar and Chidyatapu, contributed mostly byHalodulespp. In general, seagrass diversity and distribution were mainly influenced by the percentage composition of sand. The authors recommend that the seagrass meadow of Haddo should be considered for conservation priority because of multiple anthropogenic pressures, such as sewage input, dumping of solid wastes on the shoreline and anchoring of boats.

scholarly journals Determining seagrassess community structure using the Braun – Blanquet technique in the intertidal zones of Islas de Gigantes, Philippines

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Quin Yudelmo Clarito ◽  
Nora O. Suerte ◽  
Elena C. Bontia ◽  
Ivy Maestrecampo Clarito
Keyword(s):  
Species Diversity ◽  
Diversity Index ◽  
Environmental Parameters ◽  
Mean Value ◽  
Canopy Height ◽  
Thalassia Hemprichii ◽  
Percentage Cover ◽  
Seagrass Ecosystems ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium

The seagrass ecosystem which is considered the most productive ecosystem occurs in tropical and subtropical shallow marine waters where it supports diverse flora and fauna. Seagrasses of Islas de Gigantes, Carles, Iloilo were assessed to  determine species diversity, abundance, canopy height and percentage cover. Braun – Blanquet technique was used where 3 transects were laid in each station in three barangays of Islas de Gigantes, namely: Barangay Asluman, Barangay Granada and Barangay Gabi. A total of 7 species were found, Thalassia hemprichii, Cymodocea rotundata, Cymodocea serrulata, Halodule pinifolia, Halodule uninervis, Enhalus acoroides and Syringodium isoetifolium. Using the Shannon Diversity Index, the seagrass bed in Gabi was the most diverse with a value of 2.8. Sorenson's coefficient (CC) was used to compute the species similarity attributes indicating that the three communities have many similarities to each other in terms of species diversity and environmental parameters that affect seagrass ecosystems. Syringodium isoetifolium had recorded the highest number of shoots (475 shoots/m2) in Granada. The percentage cover of seagrasses varied across the sampling sites ranging from 55% - 67.50%, with a mean value of 62.50%. However, E. acoroides had the tallest canopy height recorded that  ranged from 12.33 – 24.83 cm.

scholarly journals Keanekaragaman Gastropoda Pada Habitat Lamun Di Perairan Desa Tayando Yamtel Kecamatan Tayando Tam Kota Tual

2020 ◽  
Vol 9 (2) ◽  
pp. 163
Author(s):  
Liyatin Gea ◽  
A. S. Khouw ◽  
Ch. I. Tupan
Keyword(s):  
Species Diversity ◽  
Food Chain ◽  
Environmental Parameters ◽  
Seagrass Habitat ◽  
Seagrass Beds ◽  
Thalassia Hemprichii ◽  
Ecological Index ◽  
Cymodocea Rotundata ◽  
Index Value ◽  
Cymodocea Serrulata

The gastropod community is an important component in the food chain in seagrass beds, where the gastropods are the detritus feeder. Research on the diversity of gastropods in seagrass habitat in the waters of Tayando Yamtel Village, Tam City, Tual District, was conducted in March-May 2018, using the quadrant linear transect method. The results of measurements of environmental parameters in Tayando Yamtel waters are: an average pH of 8.55; DO 6.59 µg / l; salinity 32.36 ‰; temperature of 29 ° C; TDS 24.7 mg / l; current velocity (0.42 m / sec) is classified as low current; and a depth of 1.5 m. Gastropod research results obtained 862 individuals consisting of 15 families and 30 species of gastropods, while for seagrass obtained 3 species namely Cymodocea rotundata, Cymodocea serrulata and Thalassia hemprichii. The highest value of composition and gastropod density at Station I was dominated by Psedeovertagus aluco species at 62.73% and 3.708 (ind / m2), while at Station II were 28.01% and 0.93 (ind / m2) and Station III were 38.46% and 0.15 (ind / m2) are dominated by Strombus gibberulus species. Based on the gastropod ecological index value, the index value of species diversity and harmony is included in the medium category and the index value of dominance is in the low category. Keywords: Gastropoda, Seagrass, Tayando Yamtel

Kestabilan Habitat Lamun Ditinjau Dari Komposisi dan Kepadatan Jenis

2012 ◽  
Vol 8 (1) ◽  
Author(s):  
Paskalina Th. Lefaan
Keyword(s):  
Line Transect ◽  
Seagrass Habitat ◽  
Pioneer Species ◽  
Thalassia Hemprichii ◽  
Climax Species ◽  
Halophila Ovalis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Cymodocea Serrulata ◽  
Stable Habitat

<em>Seagrasses habitats have both physical and ecological functions that support adjacent waters qualities and its dwelling organisms. There are varies of pressure on seagrass environmental, especially due to people activities that could decrease its function and habitat stabilities. The study aimed to determine about seagrass habitat stabilities from its species composition and/or densities. Line transect-plots and exploration methods were used in five locations of Manokwari coastal waters, that were, Andai, Rendani, Wosi, Briosi, and Tanjung Manggewa. There are five pioneer species (Cymodocea rotundata, Halodule pinifolia, H. uninervis, Syringodium isoetifolium, Halophila ovalis) and 3 climax species (Cymodocea serrulata, Enhalus acoroides, Thalassia hemprichii). The pioneer only found in Andai and Wosi, however both pioneer and climax encountered in three other locations. In Rendani and Tanjung Manggewa higher density of climax species (T. hemprichii) were 617.7 and 828.0 stands m-2, respectively, although in Briosi the higher pioneer (C. rotundata) of 570.7 stands m-2. These conditions showed that seagrass habitat in Rendani and Tanjung Manggewa are more stable compared to Briosi, as well as Andai and Wosi. It concluded that pioneer species found in newly formed habitat or disturbed, on the other hand, climax in more stable habitat.</em>

Studies in the geology and mineralogy of soils: II. Soils of South-East Scotland

1929 ◽  
Vol 19 (4) ◽  
pp. 802-813 ◽  
Author(s):  
R. Hart
Keyword(s):  
Mineral Content ◽  
Mineralogical Composition ◽  
Fine Sand ◽  
Parent Material ◽  
The South ◽  
Sand Fraction ◽  
Silicate Minerals ◽  
Fresh State ◽  
The Matrix

(1) The mineralogical composition of the fine sand fraction of certain soils from the south-east of Scotland is described.(2) The soils are shown to possess a fairly high content of silicate minerals in a comparatively fresh state.(3) The distribution and amount of potash, phosphate and lime-bearing minerals in the soils is discussed.(4) The soils can be grouped according to their mineral content and this grouping is found to depend on the geology of the parent material.(5) All the soils are formed on glacial drift and the results suggest that the local rocks have a preponderating influence on the composition of the matrix of the drift.

scholarly journals Biomasa dan Simpanan Karbon pada Ekosistem Lamun di Perairan Batulawang dan Pulau Sintok Taman Nasional Karimunjawa, Jepara

2021 ◽  
Vol 10 (3) ◽  
pp. 413-420
Author(s):  
Annisa Rhamadany ◽  
Chrisna Adhi Suryono ◽  
Delianis Pringgenies
Keyword(s):  
Carbon Content ◽  
Carbon Storage ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Halophila Ovalis ◽  
A Value ◽  
Seagrass Biomass ◽  
Seagrass Ecosystems ◽  
Cymodocea Rotundata ◽  
Thalassodendron Ciliatum

Ekosistem lamun memiliki fungsi ekologi dan ekonomi yang tinggi. Peran ekosistem lamun dalam penyimpanan karbon akan tetapi masih belum menjadi sorotan. Tujuan dari penelitian ini yaitu untuk mengetahui nilai biomassa dan estimasi simpanan karbon pada ekosistem lamun di Perairan Batulawang, Pulau Kemujan serta Pulau Sintok, Taman Nasional Karimunjawa. Penelitian ini dilaksanakan pada 7 – 14 Noevmber 2019 di Perairan Batulawang dan Pulau Sintok, Taman Nasional Karimunjawa. Metode penelitian di lapangan menggunakan metode SeagrassWatch, sementara nilai biomassa dan nilai estimasi simpanan karbon dihitung menggunakan metode Metode Loss of Ignition (LOI) di laboratorium. Data yang diperoleh berupa pengukuran berat kering untuk menghitung biomassa dan analisa kandungan karbon pada lamun dan sedimen. Hasil penelitian didapatkan empat jenis lamun di Perairan Batulawang yaitu Enhalus acoroides, Thalassia hemprichii, Cymodocea serrulata, dan Thalassodendron ciliatum sedangkan di Pulau Sintok terdapat tiga jenis lamun yang ditemukan yaitu Thalassia hemprichii, Cymodocea rotundata, dan Halophila ovalis. Nilai total biomassa lamun terbesar pada Perairan Batulawang yaitu Enhalus acoroides dengan nilai 849,75 gbk/m2 dan nilai total biomassa lamun terkecil Thalassodendron ciliatum dengan nilai 29 gbk/m2. Nilai total biomassa lamun terbesar pada Pulau Sintok yaitu Cymodocea rotundata dengan nilai 177,75 gbk/m2dan nilai total biomassa lamun terkecil Halophila ovalis dengan nilai 4,75 gbk/m2. Hasil pengukuran karbon lamun pada Perairan Batulawang yaitu 12,97 – 359,87 gC/m2­ dan 258,20 – 541,51 gC/m2 pada sedimennya. Hasil pengukuran karbon pada lamun di Pulau Sintok yaitu 2,35 – 85,80 gC/m2 dan 204,92 – 765,92 gC/m2 pada sedimen. Kandungan karbon paling besar terdapat pada bagian bawah substrat (below ground). Kandungan karbon pada bagian bawah substrat tidak terganggu oleh faktor lingkungan (gelombang, arus, dan ulah manusia) sehingga terakumulasi baik. Seagrass ecosystems have high ecological and economic functions. The role of seagrass ecosystems in carbon storage, however, has not yet been highlighted. The purpose of this study was to determine the value of biomass and estimated carbon storage in seagrass ecosystems in Batulawang waters, Kemujan Island and Sintok Island, Karimunjawa National Park. This research was conducted on 7 − 14 November 2019 in Batulawang waters and Sintok Island, Karimunjawa National Park. The research method in the field uses the SeagrassWatch method, while the biomass value and the estimated value of carbon storage are calculated using the Loss of Ignition (LOI) method in the laboratory. The data obtained were measurements of dry weight to calculate biomass and analysis of carbon content in seagrass and sediments. The result shows that there are four species of seagrass in Batulawang Waters, they are Enhalus acoroides, Thalassia hemprichii, Cymodocea serrulata, and Thalassodendron cliatum meanwhile in Sintok Island there are three species, they are, Thalassia hemprichii, Cymodocea rotundata, and Halophila ovalis. The measurement of carbon is done by using Loss on Ignition Method. The highest total seagrass biomass in Batulawang waters is Enhalus acoroides with a value of 849.75 gbk/m2 and the lowest total seagrass biomass is Thalassodendron ciliatum with a value of 29 gbk/m2. The highest total seagrass biomass on Sintok Island is Cymodocea rotundata with a value of 177.75 gbk/m2 and the lowest total seagrass biomass is Halophila ovalis with a value of 4.75 gbk/m2. The results of measurements of seagrass carbon in Batulawang waters are 12,97 – 359,87 gC/m2­ and 258,20 – 541,51 gC/m2 on the sediments. The result of seagrass carbon measurement in Sintok Island is 2,35 – 85,80 gC/m2 and 204,92 – 765,92 gC/m2 on the sediments. The largest carbon content is at the bottom of the substrate (below ground). The carbon content at the bottom of the substrate is not disturbed by environmental factors (waves, currents, and human activities) so that it accumulates well.

scholarly journals Pemetaan Kondisi Lamun di Perairan Sekitar Pulau Lepar Kabupaten Bangka Selatan

2019 ◽  
Vol 2 (2) ◽  
pp. 83-86
Author(s):  
Suci Puspita Sari
Keyword(s):  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Halophila Ovalis ◽  
Halodule Uninervis ◽  
Cymodocea Rotundata ◽  
Cymodocea Serrulata

Status mengenai kondisi ekosistem lamun di perairan Bangka Selatan diperlukan untuk menentukan terjadinya indikasi kerusakan lamun sebagai akibat dari aktifitas penambangan timah di wilayah pesisir. Kondisi kesehatan lamun dianalisis melalui kerapatan dan tutupan lamun sehingga dapat diketahui kondisinya.  Metode yang digunakan untuk memantau kondisi lamun pada penelitian ini adalah pemanfaatan teknologi Penginderaan Jauh dan Sistem Informasi Geografis (SIG), menggunakan algoritma Depth Invariant Index (DII). Distribusi lamun berdasarkan hasil pengolahan data citra Landsat tahun 2017 menunjukkan bahwa padang lamun di perairan Bangka Selatan seluas 4066,7 Ha. Spesies yang ditemukan dari 7 titik sampling, yaitu Enhalus acoroides, Thalassia hemprichii, Halophila ovalis, Cymodocea serrulata, Halodule uninervis, dan Cymodocea rotundata. Kondisi padang lamunnya secara umum termasuk dalam kategori “Miskin”.  

scholarly journals PENGARUH KERAPATAN LAMUN Thalassia hemprichii TERHADAP KELIMPAHAN BAKTERI HETEROTROF DI PANTAI PRAWEAN, JEPARA

2018 ◽  
Vol 7 (4) ◽  
pp. 415-422
Author(s):  
Isnaini Dian Yunita ◽  
Niniek Widyorini ◽  
Supriharyono Supriharyono
Keyword(s):  
Heterotrophic Bacteria ◽  
Nutrient Cycle ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Seagrass Ecosystem ◽  
Halodule Uninervis ◽  
Cymodocea Rotundata ◽  
Economic Function ◽  
Seagrass Density

Ekosistem lamun merupakan salah satu ekosistem yang memiliki kompleksitas dan keanekaragaman hayati yang tinggi. Padang lamun merupakan hamparan vegetasi lamun yang menutupi suatu kawasan pesisir. Selain memiliki fungsi ekonomi, lamun juga memiliki fungsi ekologis yakni berperan penting sebagai pendaur zat hara oleh mikroorganime yaitu bakteri. Penelitian ini bertujuan untuk mengetahui kerapatan lamun, kelimpahan bakteri heterotrof yang berasosiasi dengan lamun serta pengaruh kerapatan lamun dengan kelimpahan bakteri heterotrof di Pantai Prawean, Jepara. Metode yang digunakan yakni deskriptif eksplanatif dengan pengambilan sampel secara purposive dan dianalisis dengan IBM SPSS Statistic 22. Jenis lamun yang ditemukan di Pantai Prawean ada 5 (lima): Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Halodule uninervis dan Halodule pinifolia. Kerapatan tertinggi didapat dari jenis Thalassia hemprichii sebesar 78 Ind/m2 dan terendah adalah Enhalus acoroides 10 Ind/m2 dan kelimpahan bakteri heterotrof tertinggi diperoleh dari tingkat kerapatan rapat di stasiun 3 yakni 29,4x108 Upk/ml dan kelimpahan terendah diperoleh dari tingkat kerapatan jarang di stasiun 2 yakni 3,3x108 Upk/ml. Korelasi antara kerapatan lamun dengan kelimpahan bakteri heterotrof tinggi atau kuat yakni 0,896 dan korelasi ini dinyatakan sangat signifikan terbukti nilai sig. 0,001 dengan tingkat kesalahan 0,1%. Artinya bertambahnya kerapatan lamun dapat meningkatkan pula kelimpahan bakteri heterotrof. Seagrass ecosystem is one ecosytems that has high complexity and biodiversity. Seagrass beds are a stretch of seagrass vegetation that covers a coastal area. Beside its economic function, seagrass also have ecological function that play an important role of nutrient cycle for microorganism its bacteria. This study aims to determine the density of seagrass, the abundance of heterothropic bacteria and influence of seagrass density with abundance of heterotrophic bacteria at Prawean beach, Jepara. The method used in this study is descriptive explanative with purposive sampling and the data analyzed by IBM SPSS Statistic 22. There are 5 (five) species of seagrass that can be found in Prawean beach: Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Halodule uninervis and Halodule pinifolia. The highest density obtained from Thalassia hemprichii species is 78 sprouts of seagrass/m2 and the lowest density obtained from Enhalus acoroides is 10 obtained from seagrass density at station 3 its value 29,4x108Cfu/ml and the lowest abundance of heterotrophic bacteria was obtained from rare seagrass at station 2 its value 3,3x108Cfu/ml.  The corelation between seagrass density with abundance heterotrophic bacteria is high or strong that has value 0,846 and this correlation is very significantly proven has sig value 0,001 with error rate 0,1%, it can be conclude that increase of seagrass density can also increase the abundance of heterotrophic bacteria.  

scholarly journals Cadangan Karbon pada Ekosistem Padang Lamun di Siantan Tengah Taman Wisata Perairan Kepulauan Anambas

2020 ◽  
Vol 24 (1) ◽  
pp. 45-54
Author(s):  
Muhammad Al Rizky Ratno Budiarto ◽  
Johan Iskandar ◽  
Tri Dewi Kusumaningrum Pribadi
Keyword(s):  
Carbon Stock ◽  
Carbon Sink ◽  
Gravimetric Method ◽  
Total Carbon ◽  
Seagrass Beds ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Value Range ◽  
Seagrass Biomass ◽  
Cymodocea Rotundata

Secara global, ekosistem lamun dianggap sebagai penyerap karbon sehingga dapat berkontribusi terhadap mitigasi perubahan iklim. Penelitian bertujuan untuk mengetahui komposisi jenis, biomassa dan cadangan karbon pada komunitas padang lamun di perairan Siantan Tengah Taman Wisata Perairan (TWP) Kepulauan Anambas. Penelitian dilaksanakan pada bulan Agustus 2019 s.d Januari 2020. Uji kandungan karbon dilakukan dengan metode Welkley and Black sedangkan untuk mendapatkan biomassa menggunakan metode gravimetrik. Hasil penelitian menunjukkan bahwa terdapat tiga jenis lamun, yaitu Enhalus acoroides, Thalassia hemprichii, dan Cymodocea rotundata. Nilai biomassa lamun berkisar antara 171,89 – 275,68 gbk/m2 dan nilai cadangan karbon berada pada kisaran 51,89 – 80,66 gC/m2. Padang lamun di Siantan Tengah memiliki luas 130,45 ha, sehingga total Cadangan karbon pada ekosistem padang lamun di perairan Siantan Tengah diperkirakan 95,88 ton C. Penelitian ini membuktikan adanya kandungan karbon pada biomassa lamun sehingga dapat disimpulkan bahwa padang lamun berperan sebagai penyerap karbon (carbon sink).  Globally, seagrass ecosystems are considered as carbon sink so that it can contribute to climate change mitigation. This research aims to determine the species composition, biomass, and carbon stock in seagrass communities in Siantan Tengah Marine Tourism Park of Anambas Islands. The research was conducted in Agustus 2019 – January 2020.  The carbon content test was carried out by the Walkley and Black method while to obtain biomass using the gravimetric method. The result od study showed that there are three species of seagrasses, namely Enhalus acoroides, Thalassia hemprichii, and Cymodocea rotundata. Seagrass biomass value range 171,89 – 275,68 gbk/m2 and seagrass carbon stock value range 51,89 – 80,66 gC/m2. The area of seagrass beds in Central Siantan is 130,45 ha so that the total carbon stock estimated reach 95,88 tons C. This research proves the presence of carbon in the biomass of seagrass beds, so it can be concluded that seagrass beds act as carbon sinks.

scholarly journals STRUKTUR KOMUNITAS DAN ASOSIASI LAMUN (Seagrass) DI PERAIRAN PANTAI RUA PULAU TERNATE PROVINSI MALUKU UTARA

2013 ◽  
Vol 13 (1) ◽  
Author(s):  
Riyadi Subur
Keyword(s):  
Coastal Waters ◽  
Coastal Region ◽  
Positive Association ◽  
Distribution Patterns ◽  
Research Area ◽  
Negative Association ◽  
Line Transect ◽  
Thalassia Hemprichii ◽  
Marine Life ◽  
Cymodocea Rotundata

AbstrakLamun (Seagrass) merupakan salah satu ekosistem penting diwilayah pesisir yangberperan penting baik secara ekologis dan ekonomis. Keberadaan lamun mendukungkehidupan berbagai jenis biota laut. Penelitian ini bertujuan mengidentifikasi jenis-jenislamun yang berada di perairan pantai Rua, Mengetahui kepadatan, pola sebaran,keanekaragaman jenis, dan dominansi serta asosiasi antara spesies. Penelitian ini dilakukandengan metode garis transek dan kuadrat. Hasil penelitian menunjukkan bahwa terdapat 4jenis lamun di perairan pantai Rua yang terdiri dari Cymodocea rotundata, Enhalusacoroides, Halodule pinifolia dan Thalassia hemprichii. T. hemprichii adalah jenis dengankepadatan tertinggi di perairan Rua yaitu 16,70 ind/m2, serta E. acoroides, memilikikepadatan terendah yakni 5,77 ind/m2. Jenis lamun yang ditemukan di lokasi penelitianseluruhnya memiliki pola sebaran mengelompok dengan keanekaragaman yangdikategorikan rendah yaitu sebesar 1,32, serta indeks dominasi sebesar 0,27. Tipe asosiasilamun di lokasi penelitian yaitu asosiasi positif (+), serta asosiasi negatif (-).Kata Kunci. Struktur Komunitas, Asosiasi, lamun.AbstractSeagrass is a important ecosystems coastal region that is important both ecologically andeconomically . The seagrass supports of various marine life. This study to propose identify thespecies of seagrasses in coastal waters in Rua, Knowing the density, distribution pattern,species diversity, and dominance as well as associations between species. This study wasconducted using line transect and kuadrats. The results showed that there are 4 species ofseagrass in Rua consisting of Cymodocea rotundata , Enhalus acoroides , pinifolia Haloduleand Thalassia hemprichii . T. hemprichii is highest density (16.70 ind/m2), and E. acoroides ,which has the lowest density (5.77 ind/m2). Species seagrass found in the research area allhave clumped distribution patterns are categorized with diversity low at 1.32 , and dominanceindex at 0.27. Type association of seagrass in the location studies is positive association ( + )and negative association ( - ).Key Words:community structur, association, seagrass

scholarly journals Comparing demersal megafaunal species diversity along the depth gradient within the South Aegean and Cretan Seas (Eastern Mediterranean)

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0184241 ◽  
Author(s):  
Panagiota Peristeraki ◽  
George Tserpes ◽  
Nikolaos Lampadariou ◽  
Kostantinos I. Stergiou
Keyword(s):  
Species Diversity ◽  
Eastern Mediterranean ◽  
Depth Gradient ◽  
The South
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