scholarly journals Struktur Komunitas Padang Lamun Di Perairan Gili Air, Lombok Utara

2021 ◽  
Vol 1 (2) ◽  
pp. 16-25
Author(s):  
Ibadur Rahman ◽  
Nurliah ◽  
Edwin Jefri ◽  
Chandrika Eka Larasati
Keyword(s):  
Quality Analysis ◽  
Marine Biota ◽  
Nursery Ground ◽  
Spawning Ground ◽  
Water Quality Analysis ◽  
Study Program ◽  
Marine Aquaculture ◽  
Seagrass Community ◽  
Halophila Ovalis ◽  
Cymodocea Rotundata

Seagrass is a coastal ecosystem that has important role as a feeding ground, a spawning ground and a nursery ground for various marine biota. This study aims to examine the biodiversity of seagrass at Gili Air, North Lombok Regency, West Nusa Tenggara. This study was conducted to observe the cover percentage of seagrass, it's composition, the number of seagrass stands, canopy's height, frequency of seagrass presence, and index of importance of seagrass. Seagrass data was collected using a 50cm x 50cm quadrant transect, with a total area of 100 m2, referring to the monitoring standards set by SeagrassNet. Water quality analysis was carried out at the Bioecology Laboratory of the Aquaculture Study Program, University of Mataram, and at the Laboratory of the Marine Aquaculture Center (BPBL) of Sekotong, West Lombok. The results showed that the seagrass communities in Gili Air waters were composed of 5 (five) species: Halophila ovalis, Thalassia hemperichii, Cymodocea rotundata, Halodulea pinifolia, and Halodule uninervis, with the percentage of coverage ranging from 26.88-39.17%, and the average coverage by 31.53%. Thalassia hemperichii is the species that has the highest contribution to the seagrass community at Gili Air.

scholarly journals Biodiversitas Echinodermata pada Ekosistem Lamun di Perairan Pulau Karimunjawa, Jepara

2020 ◽  
Vol 23 (1) ◽  
pp. 47
Author(s):  
Reni Ria Yunita ◽  
Suryanti Suryanti ◽  
Nurul Latifah
Keyword(s):  
Nursery Ground ◽  
Spawning Ground ◽  
Thalassia Hemprichii ◽  
Halophila Ovalis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Holothuria Atra ◽  
The Relationship ◽  
Cymodocea Serrulata ◽  
Diadema Setosum

The seagrass ecosystem is an important ecosystem as the place of feeding ground, nursery ground, and spawning ground. One of the biotas living in the seagrass was Echinoderms. This research aims to determine the density of seagrass and biodiversity of Echinoderms and the relationship between the seagrass density with the abundance of Echinoderms in the waters of Karimunjawa Island. The sampling methods used in this research is purposive sampling with two stations at a different location and each station there were three transect lines. The types of seagrass found in the waters of Karimunjawa Island are eight species i.e.: Thalassia hemprichii, Cymodocea rotundata, Enhalus acoroides, Syringodium isoetifolium, Cymodocea serrulata, Halophila minor, Halophila ovalis and Halodule uninervis. The type of Echinoderms found consists of three different classes i.e., Asteroidea, Echinoidea, and Holothuroidea. Class of Asteroidea, there is 1 type i.e., Archaster typicus. Class of Echinoidea, there are 3 types i.e., Diadema setosum, Laganum central, and Laganum depressum. Class of Holothuroidea, there is  1 type i.e., Holothuria atra.  The value of the diversity index (H ') of Echinoderms ranged from 1.24 to 1.49. The range of index values of diversity (H ') of Echinoderms in Karimunjawa Island has medium species diversity. The results of this research show that the value of seagrass correlation with Echinodermata (r) is -0.458, it means that the relationship between them is close enough and the higher density of seagrass then the abundance of echinoderms is lower.    Ekosistem lamun merupakan ekosistem penting sebagai tempat feeding ground, nursery ground, dan spawning ground. Salah satu biota yang hidup di ekosistem lamun adalah Echinodermata. Penelitian ini bertujuan untuk mengetahui kerapatan lamun dan biodiversitas Echinodermata serta hubungan antara kerapatan lamun dengan kelimpahan Echinodermata di perairan Pulau Karimunjawa. Teknik sampling  yang digunakan dalam penelitian ini adalah purposive sampling dengan  dua stasiun pada lokasi yang berbeda dan masing-masing stasiun terdapat 3 line transek. Line transek ditarik secara tegak lurus pantai sepanjang 50 meter dari pertama kali ditemukan lamun. Pengamatan yang dilakukan meliputi jenis dan jumlah lamun, jenis dan jumlah Echinodermata yang ditemukan  pada setiap transek serta pengukuran parameter lingkungan perairan . Jenis lamun yang ditemukan di perairan Pulau Karimunjawa terdapat 8 jenis yaitu  Thalassia hemprichii, Cymodocea rotundata, Enhalus acoroides, Syringodium isoetifolium, Cymodocea serrulata, Halophila minor, Halophila ovalis dan Halodule uninervis. Jenis Echinodermata yang ditemukan terdiri dari 3 kelas yang berbeda yaitu Asteroidea, Echinoidea, dan Holothuroidea. Kelas Asteroidea terdapat 1 jenis yaitu Archaster typicus, kelas Echinoidea terdiri dari 3 jenis yaitu Diadema setosum, Laganum central, dan Laganum depressum, sedangkan kelas Holothuroidea dijumpai 1 jenis yaitu Holothuria atra. Nilai indeks keanekaragaman  (H’) Echinodermata berkisar 1,24 - 1,49. Kisaran nilai indeks keanekaragaman (H’) Echinodermata di Pulau Karimunjawa memiliki keanekaragaman jenis sedang.  Hasil penelitian menunjukkan nilai korelasi lamun dengan Echinodermata (r) -0,458 yang berarti hubungan diantara keduanya cukup erat dan semakin rapat lamun maka kelimpahan Echinodermata semakin rendah.

scholarly journals KOMUNITAS LAMUN DI PERAIRAN PANTAI DESA ORI, MALUKU TENGAH

2021 ◽  
Vol 17 (2) ◽  
pp. 97-103
Author(s):  
Sarah Haumahu ◽  
Frijona F Lokollo ◽  
Reni Ambon
Keyword(s):  
Coastal Waters ◽  
Line Transect ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Seagrass Community ◽  
Halophila Ovalis ◽  
The World ◽  
Cymodocea Rotundata ◽  
Frequency Of Occurence

Seagrass communities play an important role in marine environments and estuary area, supporting communities of fish, snails and shellfish and other invertebrates. The diversity of seagrass species in the world is very low (<60 species). The coastal waters of Ori Village have a seagrass community that has never been studied. The purpose of this study was to estimate the structure of the seagrass community in the coastal waters of Ori Village, Central Maluku which includes the composition of type, density, frequency of occurence and percent of coverage. Seagrass sampling uses the line transect method. Five species of seagrass were found during the study grouped into two families: Cymodoceaceae and Hydrocharitaceae. The seagrass species found were Cymodocea rotundata, Halodule pinifolia, Enhalus acoroides Halophila ovalis and Thalassia hemprichii. T. hemprichii and E. acoroides have the highest densities (157 shoots/m2 and 137 shoots/m2, respectively). E. acoroides and T. hemprichii also have the highest frequency of occurence and relative coverage percent compared to other seagrass species found in the waters of Ori Village. Seagrass community in the waters of Ori Village is classified in a tight condition until dense.   ABSTRAK Komunitas lamun memegang peranan penting di lingkungan laut dan daerah estuari, menyokong komunitas ikan, siput dan kerang-kerangan serta invertebrata lainnya. Keragaman spesies lamun di dunia sangat rendah (<60 spesies). Perairan pantai Desa Ori memiliki komunitas lamun yang belum pernah diteliti. Tujuan dari penelitian ini adalah untuk mengestimasi struktur komunitas lamun di perairan pantai Desa Ori, Maluku Tengah yang meliputi komposisi jenis, kerapatan, frekuensi kehadiran dan persen penutupan. Pengambilan sampel lamun menggunakan metode transek garis. Lima spesies lamun ditemukan selama penelitian yang dikelompokan dalam dua famili yaitu famili Cymodoceaceae dan Hydrocharitaceae. Spesies-spesies lamun yang ditemukan adalah Cymodocea rotundata, Halodule pinifolia, Enhalus acoroides Halophila ovalis danThalassia hemprichii. T. hemprichii dan E. acoroides memiliki kerapatan tertinggi (masing-masing 157 tegakan/m2 dan 137 tegakan/m2). E. acoroides dan T. hemprichii juga memiliki frekuensi kehadiran serta persen penutupan relatif tertinggi dibanding spesies-spesies lamun lainnya yang ditemukan di perairan Desa Ori. Komunitas lamun di perairan Desa Ori tergolong dalam kondisi rapat sampai padat.   Kata Kunci: Lamun, komunitas, kerapatan, penutupan, Maluku Tengah      

scholarly journals ANALISIS HUBUNGAN JARAK DAN KEDALAMAN DENGAN STRUKTUR KOMUNITAS LAMUN DI PANTAI PANCURAN, KEPULAUAN KARIMUNJAWA

2018 ◽  
Vol 7 (4) ◽  
pp. 352-360
Author(s):  
Muhammad Gaffar Ridho ◽  
Supriharyono Supriharyono ◽  
Arif Rahman
Keyword(s):  
Environmental Parameters ◽  
Sampling Technique ◽  
Sediment Characteristics ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Seagrass Community ◽  
Halophila Ovalis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Index Of Diversity

Pantai Pancuran adalah salah satu lokasi konservasi padang lamun di Taman Nasional Karimunjawa dengan vegetasi padang lamun. Penelitian ini dilaksanakan pada bulan April 2018 dengan tujuan untuk mengetahui hubungan jarak dan kedalaman dengan struktur komunitas lamun yang meliputi kerapatan dan indeks keanekaragamannya. Materi yang digunakan adalah lamun, dengan menggunakan metode deskripsi eksploratif yang bersifat observasi dengan objek yang diteliti di lapangan. Teknik pengambilan sampel menggunakan kuadran transek ukuran 1x1 meter yang tersebar di 3 stasiun berdasarkan jarak dan kedalaman serta terdapat 6 plot pada setiap stasiunnya. Parameter lingkungan yang diamati meliputi jarak dan kedalaman, nitrat dan fosfat sedimen, salinitas, suhu, derajat keasaman (pH), kecerahan, kecepatan arus, pasang surut, dan karakteristik sedimen. Hubungan jarak dan kedalaman dengan struktur komunitas lamun diproses menggunakan analisis regresi dan korelasi. Hasil penelitian ini didapatkan 6 jenis lamun yaitu Thalassia hemprichii, Cymodocea rotundata, Halophila ovalis, Syringodium isoetifolium, Enhalus acoroides, dan Halodule pinifolia. Karakteristik sedimen didominasi oleh pasir halus sebanyak 34,960 %. Korelasi jarak dan kedalaman dengan struktur komunitas lamun diperoleh nilai                 (r = -0,717) pada kerapatan dan ( r = 0,894) pada indeks keanekaragaman.                  Pancuran Beach is one of the seagrass conservation areas in Karimunjawa National Park. This study was conducted in April 2018, in order to investigate the relation of distance and depth on the structure of seagrass community which included the density and index of diversity. The method used in this study is seagrass, using explorative description method that is observation to the object study in the field. The sampling technique uses a 1x1 meter transect quadrant spread over 3 stations based on distance and depth with includes 6 plots at each station. Environmental parameters observed include distance and depth, sediment of nitrate and phosphate, salinity, temperature, acidity (pH), brightness, current velocity, tides, and sediment characteristics. The relationship between distance and depth on the structure of seagrass community processed by regression and correlation analysis . The results of the study found 6 types of seagrass, there were Thalassia hemprichii, Cymodocea rotundata, Halophila ovalis, Syringodium isoetifolium, Enhalus acoroides, and Halodule pinifolia. Sediment characteristics were dominated is fine sand of 34.960%. The correlation of distance and depth on the structure of seagrass community resulted a value (r = -0,717) for density and  (r = 0,894) for index of diversity. 

scholarly journals Ekologi Lamun di Pulau Sintok, Pulau Kemujan dan Pulau Menjangan Besar Kepulauan Karimunjawa, Jawa Tengah

2019 ◽  
Vol 8 (3) ◽  
pp. 277-284
Author(s):  
Abdul Latif Mahakar ◽  
Retno Hartati ◽  
Suryono Suryono
Keyword(s):  
Survey Method ◽  
Nursery Ground ◽  
Purposive Sampling ◽  
Enhalus Acoroides ◽  
Halophila Ovalis ◽  
Seagrass Ecosystem ◽  
Seagrass Cover ◽  
Cymodocea Rotundata ◽  
Cymodocea Serrulata

Lamun memiliki tingkat produktivitas primer yang tinggi dan memiliki kemampuan dalam meredam kekuatan arus dan gelombang. Membuat ekosistem lamun sangat menarik dan nyaman bagi kehidupan organisme perairan, baik sebagai tempat untuk mencari makan, tempat memijah ataupun tempat untuk pembesaran anak/larva/juvenile. Padang lamun merupakan ekosistem yang bermanfaat, tetapi kurang diperhatikan. Peneltian ini bertujuan Mengidentifikasi jenis, mengetahui kerapatan dan tutupan lamun di perairan Pulau Sintok, Pulau Kemujan dan Pulau Menjangan Besar Kepulauan karimunjawa. Metode yang digunakan dalam penelitian adalah metode survey. Pengamatan sampel lamun dilakukan dengan metode transek kuadran dan penentuan lokasi penelitian mengguanakan metode purposive sampling, dibagi berdasarkan zonasi. Analisis data berupa perhitungan kerapatan (Ind/m²) dan penutupan lamun (%). Hasil penelitian telah menemukan 6 jenis lamun, yaitu Cymodocea  serrulata, Cymodocea rotundata, Enhalus acoroides, Thalasia hemprichi, Halophila ovalis dan Halophila minor. Pulau Sintok sebagai zona perlindungan bahari memiliki nilai kerapatan lamun tertinggi dengan kisaran  98,22-5,56 Ind/m². Diikuti oleh Pulau Menjangan Besar dengan kisaran 62,67-12,67 Ind/m sebagai zona pemanfaatan wisata bahari dan Pulau Kemujan sebagai zona pemukiman dengan kisaran 50-27,33 Ind/m². Sedangkan untuk  tutupan lamun, pada Pulau Sintok dengan kisaran 23,61-1,30%. Pulau Kemujan dengan kisaran 22,61-10,29% dan Pulau Menjangan Besar berkisar 18,75-2,39%. Thalasia hemprichi adalah spesies dengan nilai kerapatan dan tutupan tertinggi dari seluruh lokasi penelitian dengan 98,22 Ind/m² dan 23,61%. Dan spesies terendah untuk kerapatan dan tutupan adalah Cymodocea serrulata dengan 5,56 Ind/m² dan 1,30%. Seagrass have primary level of productivity is high and has the ability to soften the strength of the current and waves. Make seagrass ecosystem is very interesting and comfortable for the life of the organism the waters, both as a place to feeding ground, spawning ground or place to nursery ground. The seagrass is a useful ecosystem, but less noted. This research aims identify the species, know the density and seagrass cover at Sintok Island, Kemujan Island and Menjangan Besar Island Karimunjawa Islands. This research conducted on 15 May 2016 at Sintok Island, Kemujan Island and Menjangan Besar Island Karimunjawa Islands. The method used in this research is the survey method. Sample observation seagrass done with the transect quadrant method. The determination of the location of the research using the method purposive sampling, divided based on over zoning. Data Analysis in the form of calculating the density (Ind/m²) and seagrass cover (%).The results of research has found 6 species of seagrass, namely, Cymodocea rotundata Cymodocea serrulata, Enhalus acoroides, Thalasia hemprichi, Halophila ovalis and Halophila minor. Sintok island as protection zone bahari has the highest seagrass density value with a range of 98,22-5.56 Ind/m². Followed by of Menjangan Besar Island with 62,67-12,67 Ind/m² as a zone of the utilization of marine tourism and Kemujan Island as residential zone with a range of 50-27,33 Ind/m². While for the seagrass cover,on the Sintok Island with a range of 23,61-1,30%. Kemujan Island with a range of 22,61-10,29% and And Menjangan Besar Island range 18,75-2.39%. Thalasia hemprichi is the species with the value of the density and the highest cover from the entire research location with 98,22 Ind/m² and 23,61%. And the species to low density and cover is Cymodocea serrulata with 5.56 Ind/m² and 1,30%.

scholarly journals Studi Struktur Komunitas Padang Lamun Di Pulau Parang, Kepulauan Karimunjawa

2019 ◽  
Vol 8 (1) ◽  
pp. 107-116
Author(s):  
Amin Nur Kolis Rela Hidayah ◽  
Raden Ario ◽  
Ita Riniatsih
Keyword(s):  
Random Sampling ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Seagrass Community ◽  
Halophila Ovalis ◽  
A Value ◽  
Seagrass Ecosystem ◽  
Seagrass Cover ◽  
Cymodocea Rotundata ◽  
Important Value Index

Struktur komunitas lamun merupakan suatu konsep yang harus diketahui untuk mengetahui kondisi ekosistem perairan tersebut. Padang lamun memiliki peran penting dalam kehidupan yang ada dibawah laut dangkal, sehingga ekosistem padang lamun perlu untuk dijaga kelestariannya agar keberlangsungan produktivitas di ekosistem tersebut tetap seimbang. Tujuan penelitian ini adalah menghitung dan menganalisis komposisi jenis, kerapatan serta persen tutupan lamun, mengetahui indeks ekologi lamun seperti keanekaragaman, keseragaman, dominansi dan mengetahui indeks nilai penting lamun di Pulau Parang. Penelitian dilakukan pada bulan Agustus sampai September 2017. Metode penelitian menggunakan metode deskriptif, terdapat 2 lokasi (A dan B) dengan 3 stasiun disetiap lokasinya. Penentuan lokasi dengan metode purposive random sampling. Pada saat penelitian, setiap stasiun menggunakan transek kuadran ukuran 1 x 1 m pada hamparan lamun. Transek ini dibagi menjadi 16 buah kisi ukuran 25 cm2. Jumlah tegakan diamati langsung secara visual. Hasil penelitian menunjukkan 4 jenis lamun, yaitu Enhalus acoroides, Halophila ovalis, Cymodocea rotundata dan Thalassia hemprichii. Kisaran kerapatan lamun yang ditemukan 5–219 tegakan/m2. Rata–rata persen tutupan lamun menunjukkan nilai 17,61% (Lokasi A) dan 19,24% (Lokasi B). Indeks Nilai Penting menunjukkan Cymodocea rotundata berperan penting dalam kondisi ekosistem perairan di lokasi A dan B . Indeks ekologi lamun menunjukkan bahwa nilai keanekaragaman tergolong sedang di Lokasi A dan rendah di Lokasi B, sedangkan nilai keseragaman tergolong tinggi di Lokasi A dan sedang di Lokasi B dan nilai dominansi tergolong sedang di Lokasi A dan tinggi di Lokasi B. The seagrass community structure is the concept that must be known to determine the condition of the aquatic ecosystem. Due to the fact thar seagrass beds have an important role in life under the shallow sea, the seagrass ecosystem needs to be preserved so that the sustainability of productivity in the ecosystem remains balanced. The purpose of this study was to calculate and analyze the species composition, density and the precentage of seagrass cover, to know the index of seagrass ecology such as diversity, uniformity, dominance and to know the important value index of seagrass in Parang Island. The study was conducted from August to September 2017. The research method used a descriptive method, there were 2 locations (A and B) with 3 stations in each location. The determination of location was done by doing a purposive random sampling method. During the research, each station used a 1 x 1 m quadrant transect on a seagrass bed. This transect was divided into 16 lattice sizes of 25 cm2. The number of stands was observed visually. The results of this research showed that there were 4 types of seagrass, such as Enhalus acoroides, Halophila ovalis, Cymodocea rotundata and Thalassia hemprichii. The seagrass density that found was 5–219 stands / m2. The percentage of seagrass cover showed a value of 17.61% (Location A) and 19.24% (Location B). Important Value Index showed that Cymodocea rotundata plays an important role in the condition of aquatic ecosystems in locations A and B. The seagrass ecology index showed that the diversity value is classified as medium in Location A and low in Location B. Uniformity values are high in Location A and medium in Location B and dominance values are medium in Location A and high in Location B. 

scholarly journals THE COMMUNITY STRUCTURE OF SEAGRASS IN ENGGANO ISLANDS, BENGKULU

2008 ◽  
Vol 33 (1) ◽  
pp. 7-10 ◽  
Author(s):  
M. A. Farid ◽  
S. Rasidi ◽  
M. P. Patria
Keyword(s):  
Community Structure ◽  
Distribution Pattern ◽  
Diversity Index ◽  
Enhalus Acoroides ◽  
Seagrass Community ◽  
Halophila Ovalis ◽  
Halodule Uninervis ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Cymodocea Serrulata

The community structure of seagrass in Enggano Islands has been studied in August 2004. The aim of the study was to assess the seagrass community including species composition, density, and distribution pattern. The study was executed using transect quadrat methods, where seagrasses were counted in quadrats of 50 cm2. The result showed that the Enggano Islands seagrasses consist of seven species Enhalus acoroides, Halophila ovalis, Thallasia hemprichii, Cymodocea rotundata, Cymodocea serrulata, Halodule uninervis, and Syringodium isoetifolium. The highest density occurred in Dua Island dominated by Thallasia hemprichii (363.3 shoots m-2), while the lowest density occurred in Merbau Island dominated by Enhalus acoroides (0.4 shoot m-2). The highest diversity index (HB) occurred in Kiape Bay (1.446) and the lowest in Merbau Island (0.634). In general, seagrass community in Enggano Islands was dominated by Thallasia hemprichii. All species has clumped distribution pattern (Id > 1).

STUDI PERBANDINGAN KUALITAS AIR BERSIH DALAM KAITANYA DENGAN AKTIVITAS MASYARAKAT DI SEKITAR SUMBER AIR PADA DESA WAINITU, BATUMERAH, AMAHUSU, DAN HALONG

2017 ◽  
Vol 13 (2) ◽  
pp. 111-119
Author(s):  
Lela Uyara ◽  
Pieter Kunu ◽  
Silwanus M Talakua
Keyword(s):  
Water Quality ◽  
Quality Standard ◽  
Total Coliform ◽  
Quality Analysis ◽  
Clean Water ◽  
Water Quality Analysis ◽  
E Coli ◽  
Microbiological Parameters ◽  
Standard Quality

The study aims to determine the quality of clean water in the villages of Wainitu, Batumerah, Amahusu and Halong by comparing the result of water quality analysis with water quality standard. Water quality analysis includes Physiscal, Chemical, and Microbiological parameters. This research uses descriptive method, this method describes systematics, accurate about facts and characteristic of the quality of clean water of each research location. The results showed that the source of clean water in the village of Batumerah did not meet the standard of clean water quality standards indicated by the number of E. coli and the high total coliform.  Keywords: standard quality of clean water, water quality, Wainitu, Batumerah, Amahusu and Halong villages   ABSTRAK Penelitian yang bertujuan untuk menetapkan kualitas air bersih di Desa Wainitu, Batumerah, Amahusu dan Halong, dengan membandingkan hasil analisis kualitas air dengan standar baku mutu air bersih. Analisis kualitas air meliputi parameter fisika, kimia dan mikrobiologi. Penelitian ini menggunakan metode deskriptif; metode ini menggambarkan sicara sistematis, akurat, fakta dan karakteristik mengenai kualitas air bersih di masing-masing lokasi penelitian. Hasil penelitian menunjukkan bahwa sumber air bersih di Desa Batumerah tidak memenuhi standar baku mutu air bersih yang ditunjukkan oleh jumlah E. coli dan total Koliform yang tinggi. Kata Kunci: baku mutu air bersih, Desa Wainitu, Batumerah, Amahusu dan Halong, kualitas air

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>

Effect of Salinity on Reaeration Coefficient of Receiving Waters

1984 ◽  
Vol 16 (5-7) ◽  
pp. 139-154 ◽  
Author(s):  
Ching-Gung Wen ◽  
Jao-Fuan Kao ◽  
Lawrence K Wang ◽  
Chii Cherng Liaw
Keyword(s):  
Saline Water ◽  
Chloride Concentration ◽  
Practical Method ◽  
Tidal River ◽  
Quality Analysis ◽  
Flow Conditions ◽  
Water Quality Analysis ◽  
Design Engineers ◽  
Reaeration Coefficient ◽  
Receiving Waters

A practical method of determining reaeration coefficients would greatly aid design engineers in determining the degree of wastewater treatment required for a proposed effluent discharge. Many previous tidal river and estuary studies emphasized mainly the effects of flow conditions (such as velocity, water depth, turbulent intensity, hydraulic gradient, etc.) and temperature on stream aeration, and the effect of salts was not seriously considered. In this research a new mathematical model of reaeration coefficient considering the effect of salts has been developed for water quality analysis in tidal rivers and estuaries. The reaeration coefficient in saline water, k2s(day−1, base e) at any chloride concentration C(g/l) and at 20°C, can be expressed byin which k2f is the reaeration coefficient in fresh water at 20°C. The correlation coefficient of k2s/k2f and C is 0.88.

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