Distribution of seagrasses and associated juvenile commercial penaeid prawns in north-eastern Queensland waters

1987 ◽  
Vol 38 (1) ◽  
pp. 103 ◽  
Author(s):  
RG Coles ◽  
WJ Lee Long ◽  
BA Squire ◽  
LC Squire ◽  
JM Bibby
Keyword(s):  
Summer Rainfall ◽  
Dry Weight ◽  
Seagrass Beds ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Halophila Ovalis ◽  
Penaeid Prawn ◽  
Seagrass Biomass ◽  
Almost All ◽  
The Tropics

Thirteen species of seagrass and six species of juvenile penaeid prawn of commercial importance were found in seagrass beds in waters between Cape York and Cairns. The pioneering seagrass species, Halodule uninemis (Forsk.) Aschers, and Halophila ovalis (R. Br.) Hook. f., were present in almost all coastal areas. Two seagrass species often dominant in the tropics, Enhalus acoroides (L.f.) Royle and Thalassia hemprichii (Ehrenb.) Aschers., were uncommon. This is likely to have resulted from environmental stress during periods of reduced salinity and high turbidity associated with seasonal summer rainfall. Halophila decipiens Ostenfeld was the only species found in depths > 11 m. Three depth-related zones of species are described. With the exception of E. aroroides, most seagrasses were <20 cm in height. Seagrass biomass was greatest in 2-6 m of water. Maximum dry weight of above-ground plant material and maximum leaf area from a square metre of bottom was 99.6 g and 4.5 m2, respectively, at the Flinders Group of islands. The distribution of prawns and seagrasses did not show a trend with latitude. Penaeus esculentus Haswell and Metapenaeus endeavouri (Schmitt), the most numerous penaeid prawn species in commercial trawl catches, were also the most numerous juvenile prawns in seagrass beds. Juvenile P. longistylus Kubo were found for the first time in northern Queensland seagrass beds. Although juveniles of this species appeared to occupy only a narrow habitat range, these habitats were found in coastal bays, in estuaries and on coral-reef platforms where conditions were suitable. Size-class data suggest that reef prawns and coastal prawns are parts of the same population. The timing of the life cycle of the major commercial prawn species differed from that found previously in the Gulf of Carpentaria.

scholarly journals KAJIAN KOMUNITAS EKOSISTEM LAMUN DI SEMENANJUNG TARABITAN KECAMATAN LIKUPANG BARAT KABUPATEN MINAHASA UTARA

2021 ◽  
Vol 9 (2) ◽  
pp. 24
Author(s):  
Risandi D Sitaba ◽  
Carolus P Paruntu ◽  
Billy Theodorus Wagey
Keyword(s):  
Species Composition ◽  
Percent Cover ◽  
Seagrass Beds ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Halophila Ovalis ◽  
Halodule Uninervis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium

This research was conducted in the waters of Tarabitan Peninsula, West Likupang North Minahasa using quadants transect method. The purpose of this study was to determine the community structure of seagrass found in that waters as initial information for sustainable management seagrass ecosystem . Field observation was conducted to identify the seagrass species, number of individuals/shoots, percent cover for each type of seagrass in those plotting quadrants. The result of this study documented 6 types of seagrass namely, Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Syringodium isoetifolium, Halophila ovalis and Halodule uninervis. The species composition and distribution of seagrass were varied and was dominated by Thalassia hemprichii was the most dominant seagrass species with a relative density of 55.55%, a relative frequency of 33.67%, 39.92% relative cover, an important value index of 129.03%, a diversity index of 1.30 belonging to this condition, moderate, the uniformity index of 0.72 is classified as high and the dominance index of 0.2 is classified as low. Based on Minister of Environment Decree Republic Indonesia No. 200 of 2004 concerning the status of seagrass beds, the condition of the seagrass beds in the waters of Tarabitan Village is classified as rich / healthy with a cover value of ≥ 60. Keywords : Seagrass Community, Species Composition,  distribution, Tarabitan Peninsula           Penelitian ini dilakukan di perairan Semenanjung Tarabitan Likupang Barat Minahasa Utara dengan menggunakan metode transek kuadran. Tujuan penelitian ini adalah untuk mengetahui struktur komunitas lamun yang terdapat di perairan tersebut sebagai informasi awal untuk pengelolaan lamun secara berkelanjutan. Pengamatan lapangan dilakukan untuk mengidentifikasi jenis lamun, jumlah individu/tegakan, persentase tutupan tiap jenis lamun pada tiap kuadran. Hasil penelitian ini mendokumentasikan 6 jenis lamun yaitu Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Syringodium isoetifolium, Halophila ovalis dan Halodule uninervis. Komposisi jenis dan sebaran lamun bervariasi dan didominasi oleh jenis lamun Thalassia hemprichii merupakan jenis lamun yang paling dominan dengan kerapatan relatif 55,55%, frekuensi relatif 33,67%, tutupan relatif 39,92%, indeks nilai penting 129,03%, indeks keanekaragaman 1,30 tergolong dalam kondisi sedang, indeks keseragaman 0,72 tergolong tinggi dan indeks dominansi 0,2 tergolong rendah. Berdasarkan Keputusan Menteri Lingkungan Hidup Nomor 200 Tahun 2004, kondisi padang lamun di perairan Desa Tarabitan tergolong kaya / sehat dengan nilai tutupan ≥ 60.Kata Kunci: Komunitas Lamun, Komposisi Jenis, Distribusi, Semenanjung Tarabitan

scholarly journals Seagrass Cholorophyll-a, Biomass and Carbon Algorithms Based on the Field and Sentinel-2A Satellite Data at Karimunjawa Island, Indonesia

2021 ◽  
Vol 6 (3) ◽  
pp. 121-130
Author(s):  
Agus Hartoko ◽  
Yoan Teresia Sembiring ◽  
Nurul Latifah
Keyword(s):  
Chlorophyll A ◽  
Satellite Data ◽  
Leaf Morphology ◽  
Dry Weight ◽  
Mitigation Strategy ◽  
Thalassia Hemprichii ◽  
Halophila Ovalis ◽  
Seagrass Biomass ◽  
Sentinel 2A ◽  
Chlorophyll A Content

Chlorophyll-a in seagrass biomass is functioned for the photosynthetic process and store the organic carbon in their biomass of the leaf, rhizome, and root. Ecologically has functioned as blue carbon in reducing global warming adaptation and mitigation strategy. The study aimed to explore seagrass species, chlorophyll-a content, biomass and carbon stock at Karimunjawa Island. Develop algorithms of the Sentinel-2A satellite data based on field seagrass chlorophyll-a, biomass and carbon and at Pokemon and Bobby beach Karimunjawa Island. Four species of seagrass found at Bobby and Pokemon beach are Holodule pinifolia with a density of 160.44 ind.m−2 , Enhalus acoroides with 26.22 ind.m−2, Halophila ovalis with 6.67 ind.m−2 and Thalassia hemprichii with 4.44 ind.m−2.The lowest seagrass chlorophyll-a is 5.854 mg.ml−1 found in H. pinifolia and the highest is 20.819 mg.ml−1found in E. acoroides at Pokemon beach. The range of seagrass chlorophyll-a at Bobby beach was 3.485 - 14.133 mg.ml−1 in T. hemprichii. The smallest individual biomass dry weight was found in T.hempirichii with 1.32 g.dry.weight per individu, and the biggest in E.acoroides with 6.98 g.dry.weight per individu. The highest seagrass biomass at Pokemon beach was in E. acoroides with 236.93 g.m−2 which has a wide leaf morphology and the lowest in H. pinifolia with 75.91 g.m−2 with the smallest leaf morphology. The range of seagrass biomass at Bobby beach is 97.62 - 264.48 g.m−2 which is dominated by T.hempirichii. The range of seagrass carbon was 109.63 - 136.82 gC.m−2at Pokemon beach, and in the range of 95.00 - 114.01 gC.m−2 at Bobby beach. Algorithm of seagrass chlorophyll-a = -36.308 (B3/B4)2 – 140.41(B3/B4) + 83.912 ; biomass = -7028.3 (B3/B4)2 + 14948 (B3/B4) – 7764.4; carbon = -17.529(B2/B3)2 + 143.82(B2/B3) – 5.3362 for Pokemon beach. Algorithm of chlorophyll-a = 455.02 (B2/B4)2 + 823.72 (B2/B4) + 375.48; biomass = -14699 (B3/B2)2 + 28395(B3/B2) – 13537; and carbon = - 0.001(B3/B4)2+ 0.209(B3/B4) - 10.203 for Bobby beach. The use of Band-2 (0.490 ????m), Band-3 (0.560 ????m) and Band-4 (0.665 ????m) Sentinel-2A satellite data in the development of seagras chlorophyll-a, biomass and carbon algorithm was found to be significant.

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 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 Kondisi dan Keanekaragaman Jenis Lamun di Perairan Pulau Serangan, Provinsi Bali

2018 ◽  
Vol 5 (1) ◽  
pp. 131
Author(s):  
Luh Gede Manik Radzena Martha ◽  
Pande Gde Sasmita Julyantoro ◽  
Alfi Hermawati Waskita Sari
Keyword(s):  
Water Quality ◽  
Diversity Index ◽  
Good Condition ◽  
Quality Parameters ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Halophila Ovalis ◽  
Cymodocea Rotundata ◽  
Index Value ◽  
Seagrass Coverage

Serangan Island is one of the tourism destinations in Bali which is administratively belong to the municipality of Denpasar. Tourism development near with the segrass habitat cause the segrass ecosystem being degraded in the waters of Serangan Island. This study was aimed to determine the diversity and conditions of seagrass species which were observed from the density and percentage of seagrass coverage and to examine the effect of water quality on the percentage of seagrass coverage. This research was conducted from February to March 2017 on Serangan Island using quantitative descriptive method. Sampling was conducted at three stations by taking data and samples of seagrass, measuring water quality (temperature, salinity, pH, turbidity, substrate observation) and analyze of nitrates and phosphates content. Seven types of seagrass species were found i.e. Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Halophila ovalis, Halodule pinifolia, Syringodium isoetifolium, and Thalassodendron ciliatum. The study showed that the diversity index value was in the medium category. The density of seagrass was classified as very tight (condition scale of 5). The highest density was found on Cymodocea rotundata spesies at station I about 777 ind/m2. The highest percentage of seagrass coverage (79,55%) was found in station I which classified as good condition, while station II and station III were classified as damaged condition with value 13.65% and 20,79% respectively. Finally, the water quality parameters have relatively low effect to seagrass coverage percentage.

Observations on dugongs at Calauit Island, Busuanga, Palawan, Phillipines

1994 ◽  
Vol 21 (6) ◽  
pp. 709 ◽  
Author(s):  
LV Aragones
Keyword(s):  
The Philippines ◽  
Thalassia Hemprichii ◽  
Halophila Ovalis ◽  
Direct Observations ◽  
Seagrass Biomass ◽  
Wet Weight ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Study Sites ◽  
Vantage Points

A simultaneous monitoring system that used a team of local observers to count dugongs around Calauit Island, Busuanga, Palawan, Philippines, from eight vantage points was employed from March 1989 to May 1990 to identify important dugong habitats around the island. On average, five dugongs were seen per survey day. More dugongs were observed during March and July 1989 than in other months. These periods coincided with the bimodal peaking of seagrass biomass in the region and the lull between monsoons for that year. The site where dugongs were most often sighted was about 1.5 m deep, had the largest area of seagrass on the island (approximately 50 ha) and supported a seagrass (above-ground) biomass averaging 1060 g m-2 (wet weight). The dugongs were shy, making observations difficult. They were observed to graze at the study sites once per day, usually starting in the late afternoon or at night. Animals usually stayed on the seaward side of the spur-and-groove sections of the reefs. Short seagrasses such as Halophila ovalis, Halodule uninervis, Cymodocea rotundata, C. serrulata, Syringodium isoetifolium and Thalassia hemprichii showed more evidence of being grazed than the taller Enhalus acoroides. By direct observations of the area grazed by a single dugong, an average consumption rate of 30.5 kg (wet weight) of seagrass (above ground only) per day was estimated. The methodology developed in this study may be used to identify reserve areas for the protection of dugong habitats in the Philippines. The dugong populations of Palawan require further attention and implementation of conservation measures.

scholarly journals SIMPANAN KARBON PADANG LAMUN DI KAWASAN PANTAI SANUR, KOTA DENPASAR

2016 ◽  
Vol 10 (1) ◽  
pp. 46 ◽  
Author(s):  
Yoga Ibnu Graha ◽  
I Wayan Arthana ◽  
I Wayan Gede Astawa Karang
Keyword(s):  
Carbon Storage ◽  
Coastal Area ◽  
Carbon Stock ◽  
Environmental Parameters ◽  
Carbon Stocks ◽  
Thalassia Hemprichii ◽  
Bottom Substrate ◽  
Total Potential ◽  
Halophila Ovalis ◽  
Seagrass Biomass

Seagrass is one of the marine resources that considerably potential as a CO2 absorbent and functioned as carbon sinks in the oceans known as blue carbon. The result of carbon sequestration from the process of photosynthesis is stored as carbon stocks on seagrass tissue, or streamed to multiple compartments, such as sediment, herbivores and other ecosystems. This study aims to assess the potential for carbon stock storage in biomass on a tissue of seagrass in Sanur Beach coastal area. The observations of seagrass are included the seagrass type, seagrass stands, and measurement of environmental parameters. Then the sampling was conducted to obtain the value of seagrass biomass. The carbon stocks obtained through the conversion of biomass by using carbon concentration analysis of seagrass tissue and then carried a spatial distribution of carbon stocks. Types of seagrass found in Sanur Beach coastal area consist of eight species that are Enhalus acroides, Thalassia hemprichii, Halophila ovalis, Syringodium isoetifolium, Cymodocea serrulata, Cymodocea rotundata, Halodule uninervis and Halodule pinifolia. The result of the carbon stock seagrass in the bottom substrate is 60% greater than the carbon stock in the top substrate which is 40%. Seagrass covering 322 ha of Sanur Beach coastal area with a total potential carbon storage of 66.60 tons or 0.21 tons / ha. Seagrass key role as a carbon storage is on the bottom substrate tissue, and Enhalus acroides is a seagrass species that contributes the most to the carbon storage.

scholarly journals The Inventory of Seagrasses in Marine Field Station of Faculty of Fisheries and Marine Science in Subdistrict of East Likupang District North Minahasa

2018 ◽  
Vol 6 (2) ◽  
pp. 38
Author(s):  
Stevani Rawung ◽  
Ferdinand F Tilaar ◽  
Ari B Rondonuwu
Keyword(s):  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Field Station ◽  
Enhalus Acoroides ◽  
Halophila Ovalis ◽  
Halodule Uninervis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Random Survey ◽  
Cymodocea Serrulata

This study was conducted in Marine Field Station of Faculty of Fisheries and Science of Sam Ratulangi University, Sub-district of East Likupang, North Minahasa. This study aims to identified the seagrasses in the water of Marine Field Station. The benefits of this study are for the database of seagrasses ecosystem management and comparative for other studies. The Observation and data collection was using random survey technic by analyzed the areas to collecting all the seagrass species found. Furthermore, the seagrass samples were categorised into each species. The result showed the amount of seagrass species in Marine Field Station are 8 species from 6 genera and 2 families: Cymodocea rotundata, Cymodocea serrulata, Halodule uninervis, Syringodium isoetifolium, Thalassia hemprichii, Enhalus acoroides,  Halophila ovalis, dan Halophila minor.Keyword: Inventory, Seagrass, Marine Field Station ABSTRAKPenelitian dilakukan di perairan Marine Field Station Fakultas Perikanan dan Ilmu Kelautan Unsrat Kecamatan Likupang Timur Kabupatan Minahasa  Utara. Tujuan penelitian  untuk mengidentifikasi lamun yang ada di Perairan Marine Field station. Manfaat penelitian dapat menjadi data pengelolaan ekosistem padang lamun dan dapat menjadi perbandingan untuk penelitian-penelitian selanjutnya. Pengamatan dan pengambilan sampel menggunakan teknik survei jelajah, yaitu dengan menjelajahi wilayah pengamatan sambil mencari semua spesies lamun. Lamun yang diambil adalah semua jenis yang ditemui. Selanjutnya, sampel lamun dikelompokan berdasarkan spesies. Hasil pengamatan menunjukkan jumlah spesies lamun pada lokasi penelitian di Perairan Marine Field Station adalah 8 spesies dari 6 genera dan 2 famili yaitu, Cymodocea rotundata, Cymodocea serrulata, Halodule uninervis, Syringodium isoetifolium, Thalassia hemprichii, Enhalus acoroides,  Halophila ovalis, dan Halophila minor. Kata kunci: Inventarisasi, Lamun, Marine Field Station

scholarly journals Community Structure of Seagrass Meadows In Mantehage Island Waters, North Sulawesi

2014 ◽  
Vol 1 (4) ◽  
pp. 177
Author(s):  
Simon I Patty ◽  
Husen Rifai
Keyword(s):  
Diversity Index ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Seagrass Meadows ◽  
North Sulawesi ◽  
Halophila Ovalis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Species Composition And Distribution ◽  
Thalassodendron Ciliatum

Research on the structure of seagrass communities in the waters of the island Mantehage was conducted in September 2010. The purpose of this study is to collect data and information on the structure of seagrass communities. Observations includes the identification seagrass species, measuring the number of individual/stand, cover percentage of each type/species on the transect. 6 types of seagrass found, i.e. Enhalus acoroides, Halophila ovalis, Thalassia hemprichii, Thalassodendron ciliatum, Cymodocea rotundata and Syringodium isoetifolium. Seagrass species composition and distribution varies at each location and is dominated by the presence of Thalassia hemprichii (48.14%) with coverage percentage ranges between 15.91% to 35.11%. Diversity index values ranged from 0.79 to 1.69 ; evenness index between 0.57 to 0.94 and the index of dominance between 0.20 to 0.56. In conclusion, the condition of seagrass meadows in Mantehage island is relatively good and can support marine life adequately.Keywords : Structure communities, seagrass, Mantehage Island

scholarly journals Local Victory: Assessing Interspecific Competition in Seagrass From a Trait-Based Perspective

2021 ◽  
Vol 12 ◽  
Author(s):  
Agustín Moreira-Saporiti ◽  
Sonia Bejarano ◽  
Inés G. Viana ◽  
Elizabeth Fay Belshe ◽  
Matern S. P. Mtolera ◽  
...  
Keyword(s):  
Resource Competition ◽  
Plant Size ◽  
Maximum Length ◽  
Competitive Interactions ◽  
Size Difference ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Functional Strategy ◽  
Seagrass Meadows ◽  
Halophila Ovalis

Tropical seagrass meadows are formed by an array of seagrass species that share the same space. Species sharing the same plot are competing for resources, namely light and inorganic nutrients, which results in the capacity of some species to preempt space from others. However, the drivers behind seagrass species competition are not completely understood. In this work, we studied the competitive interactions among tropical seagrass species of Unguja Island (Zanzibar, Tanzania) using a trait-based approach. We quantified the abundance of eight seagrass species under different trophic states, and selected nine traits related to light and inorganic nutrient preemption to characterize the functional strategy of the species (leaf maximum length and width, leaves per shoot, leaf mass area, vertical rhizome length, shoots per meter of ramet, rhizome diameter, roots per meter of ramet, and root maximum length). From the seagrass abundance we calculated the probability of space preemption between pairs of seagrass species and for each individual seagrass species under the different trophic states. Species had different probabilities of space preemption, with the climax species Thalassodendron ciliatum, Enhalus acoroides, Thalassia hemprichii, and the opportunistic Cymodocea serrulata having the highest probability of preemption, while the pioneer and opportunistic species Halophila ovalis, Syringodium isoetifolium, Halodule uninervis, and Cymodocea rotundata had the lowest. Traits determining the functional strategy showed that there was a size gradient across species. For two co-occurring seagrass species, probability of preemption was the highest for the larger species, it increased as the size difference between species increased and was unaffected by the trophic state. Competitive interactions among seagrass species were asymmetrical, i.e., negative effects were not reciprocal, and the driver behind space preemption was determined by plant size. Seagrass space preemption is a consequence of resource competition, and the probability of a species to exert preemption can be calculated using a trait-based approach.

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