scholarly journals GROWTH, BIOMASS AND PHYTOCHEMICAL COMPOUND OF SEAGRASS (CASE STUDY: MALANG REGENCY COASTAL)

2020 ◽  
Vol 12 (3) ◽  
pp. 739-746
Author(s):  
Citra Satrya Utama Dewi ◽  
Rarasrum Dyah Kasitowati ◽  
Syarifah Hikmah Julinda Sari ◽  
Ade Yamindago ◽  
Amelia Rohenda ◽  
...  
Keyword(s):  
Growth Rate ◽  
Sampling Method ◽  
Thalassia Hemprichii ◽  
Marine Habitats ◽  
Phytochemical Compounds ◽  
Below Ground ◽  
Syringodium Isoetifolium ◽  
Marine Exploration

Seagrass known as Lamun in Bahasa is one of the species that are can live in submerged marine habitats. Seagrasses have an important role in the ecosystems, including as primary producers, living habitats of benthic organisms, stabilize bed sediments and carbon storage in shallow-water coastal. Monospecies community of seagrass was found in Malang, however, only limited number studies of seagrass have been done in the area. This study aimed to determine the growth rate and biomass of the seagrass, as well as the phytochemical compounds. Experiments were conducted during August-November in 2014 and 2015. Measurement of in situ growth and biomass leaf were made using marking techniques in one week also the data of leaf seagrass collected were using a random sampling method. Extracted materials were tested by methanol to get the phytochemical compound. Data were analyzed at the Fisheries and Marine Exploration Laboratory, FPIK-UB. The results of the present study showed that two species of seagrass, Syringodium isoetifolium at Kondang Merak and Thalassia hemprichii at Bale Kambang. The growth rate of the seagrass leaves of the former species had positive values with 0.45±0.19 cm/day, hile the later species had 0.25±0.14 cm/day. Furthermore, the biomass value of the two types seagrass obtained that in the below-ground was higher than the above-ground. Phytochemical tests showed that both of type seagrass contained bioactive compounds such as flavonoids and saponins.

scholarly journals Short communication: Seagrass diversity and carbon sequestration: Case study on Pari Island, Jakarta Bay, Indonesia

2017 ◽  
Vol 18 (4) ◽  
pp. 1596-1601 ◽  
Author(s):  
TEGUH HUSODO ◽  
SAHBUDDIN DG. PALABBI ◽  
OEKAN S. ABDOELLAH ◽  
MOHAMAD NURZAMAN ◽  
NURULLIA FITRIANI ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Research Centre ◽  
Thalassia Hemprichii ◽  
Halophila Ovalis ◽  
Seagrass Ecosystem ◽  
Below Ground ◽  
Halodule Uninervis ◽  
Syringodium Isoetifolium ◽  
Cymodocea Serrulata

Husodo T, Palabbi SDG, Abdoellah OS, Nurzaman M, Fitriani N, Partasasmita P. 2017. Seagrass diversity and carbon sequestration: Case study on Pari Island, Jakarta Bay, Indonesia. Biodiversitas 18: 1596-1601. Pari Island is located in Kepulauan Seribu chain. As a tourist destination, the seagrass ecosystem at the island is constantly under pressure from time to time. An effort to prevent widespread damage is to designate parts of the coastline as a limited access research centre. Efforts to study seagrass ecosystem on Pari Island are ongoing, including studies on seagrass' ability to sequestrate carbon. This quantitative study was conducted in December 2014. Surveys are done on the abundance and density of seagrass in 122 plots (area = 50 × 50 cm2) which spread in 6 research stations. Biomass measurements were performed by extractive method on 4 types of seagrass (Cymodocea serrulata, Halophila ovalis, Halodule uninervis and Syringodium isoetifolium). The assessment of seagrass capability in storing carbon has been done by measuring the primary productivity of above ground and below ground, while the amount of carbon released is measured from littered leaves and the leaves eaten by herbivores.The findings show that there are 7 of 12 species of seagrass identified in Indonesia, i.e. Cymodoceae rotundata, Cymodoceae serrulata, Thalassia hemprichii, Enhalus acoroides, Syringodium isoetifolium, Halodule uninervis and Halophila ovalis. The dominant species is Thalassia hemprichii (density 200±153, 261±107 and 117±52 stands/m2) and Halodule uninervis (82±59 stands/m2).Seagrass’ carbon sequestration capacity in the waters surrounding Pari Island, Jakarta Bay, is approximately 0.006-1.048 gC/m2/day whereas carbon reserves are between 0.24-346.10 gC/m2.

scholarly journals Asosiasi gastropoda di ekosistem padang lamun Perairan Senggarang Besar, Kepulauan Riau, Indonesia

2020 ◽  
Vol 4 (2) ◽  
pp. 53
Author(s):  
Fajeri Fajeri ◽  
Febrianti Lestari ◽  
Susiana Susiana
Keyword(s):  
Random Sampling ◽  
Sampling Method ◽  
Positive Association ◽  
Total Density ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Seagrass Ecosystem ◽  
Density Values ◽  
Halodule Uninervis ◽  
Syringodium Isoetifolium

This study aims to determine the type and density of gastropods, the density of seagrass, seagrass closure. It also knows the association gastropods in seagrass ecosystem in the waters of the Senggarang Besar. The research was conducted by random sampling method using a point 31 transect squares measuring 1x1 meters for observation gastropods and seagrass. Results of the study were found 12 species of gastropods. Gastropod density values range between 0.35-2.94 individual/m2. Results of research on the type of seagrass found 4 species of seagrass that is, Enhalus acoroides, Thalassia hemprichii, Halodule uninervis and Syringodium isoetifolium. A density value of seagrass species Enhalus acoides 14.32 individual/m2, Thalassia hemprichii 86.39 individual/m2, Halodule uninervis 21.58 individual/m2 and Syringodium isoetifolium 3.87 individual/m2. Total density of all seagrass 126.16 individual/m2. The closure of the Seagrass Enhalus acoides 12,63%, Thalassia hemprichii 50,96%, Halodule unnerves 13,40%  and Syringodium isotifolium 0.29%. Total closure of all seagrass is 77,29%. The level of association between species of gastropods as many as 11 species have negative associations of which is Leavistrombus turturela, Strombus urceus, Planaxis sulcatus, Cerithium nesioticum, Cerithium Aluco, Cerithium zonatum, Pugilina cocholidium, Cronia margariticola, Muricodrupa fiscela, Pyrene epamella, Otopleura auriscati. While 1 species has a positive association level is kind of Rhinoclavis aspera.

Growth Rate and Biomass Leaf Production Of Thalassia hemprichii at Pengudang and Dompak Waters, Bintan Island

2021 ◽  
pp. 116-127
Author(s):  
Afis Irawan ◽  
Fadhliyah Idris ◽  
Aditya Hikmat Nugraha
Keyword(s):  
Growth Rate ◽  
Production Rate ◽  
Coastal Area ◽  
Sampling Method ◽  
Thalassia Hemprichii ◽  
Leaf Production ◽  
Leaf Type ◽  
Purposive Sampling ◽  
Rate Of Growth ◽  
Growth And Reproduction

Research on the rate of growth and reproduction of seagrass leaf type Thalassia hemprichii has been done in the waters of Pengudang and Dompak, Bintan Island. Aim this research for compare the growth rate and the production rate of Thalassia hemprichii biomass in Pengudang and Dompak coastal area, Bintan Island. The research was done by purposive sampling method, 30 individu seagrass leaves samples were taken using a plot measuring 50x50 centimeters. The results of the study were in the growth rate of the seagrass leaf type Thalassia hemprichii in the waters of Pengudang and Dompak 1.03 mm/day and 0.77 mm/day. Production rate of the Thalassia hemprichii leave biomass 0.07 gDW/m2 at Pengudang and 0.03 gDW/m2 at Dompak. Density of seagrass type Thalassia hemprichii 119.22 stands/m2 at Pengudang and 96.00 stands/m2 at Dompak. Based on test Two-Way ANOVA. There is no noticeable difference between the growth and production of the type of seagrass leaves Thalassia hemprichii in the waters of Pengudang and Dompak, Bintan Island.

scholarly journals Variasi Komposisi Dan Kerapatan Jenis Lamun Di Perairan Ujung Piring, Kabupaten Jepara

2017 ◽  
Vol 20 (2) ◽  
pp. 96
Author(s):  
Retno Hartati ◽  
Widianingsih Widianingsih ◽  
Adi Santoso ◽  
Adi Santoso ◽  
Hadi Endrawati ◽  
...  
Keyword(s):  
Quality Parameter ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Seagrass Species ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Primary Producer ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium

Seagrass has an important role for marine environment as a primary producer also as constituent and ecosystems habitats that support the life on coral reefs and mangrove or coastal. This research is aimed to identify the seagrass species and to undertand thier density and coverage. This research was conducted on June-August 2016 at Ujung Piring waters, Jepara. The research used descriptive method. Sampling was conducted on five stations, where each station performed five repetitions. The seagrasses found in research sites were identified and counted for their density and coverage. Seawater quality parameter were measured in situ. Sediment were take for grain size analysis to undertand their characteristic. The research showed that during the study period there were four species of seagrasses i.e. Enhalus acoroides, Thalasia hemprichii, Cymodocea Rotundata, and Syringodium isoetifolium. Overall this study indicate the highest and lowest density found in Thalassia hemprichii  (33,87 and 4,35 stands/m²).  E. acoroides had highest coverage (48,67%) while the lowest (8,71%) was T. hemprichii. There were variation in density and covarage of seagrass species due to water quality and showed uneven distribution of the seagrass species in that area.  Keywords : Enhalus acoroides,  Thalasia hemprichii, Cymodocea rotundata, dan Syringodium isoetifolium, variasi komposisi, Lamun memiliki peranan penting bagi kehidupan di laut sebagai produsen primer serta penyusun habitat dan ekosistem yang menyangga kehidupan di terumbu karang dan mangrove atau daratan pantai. Penelitian ini bertujuan untuk mengidentifikasi jenis-jenis lamun dan variasi kerapatan dan penutupannya di perairan Ujung Piring, Kabupaten Jepara. Penelitian ini dilakukan pada bulan Juni–Agustus 2016 di perairan Ujung Piring Jepara. Metode yang digunakan dalam penelitian ini adalah metode deskriptif. Pengambilan sampel dilakukan pada lima stasiun, dimana setiap  stasiun dilakukan lima kali pengulangan. Lamun diidentifikasi di lokasi penelitian, dihitung kerapatannya dan penutupannya. Pengukuran kualitas perairan dilakukan in situ, sedangkan sedimen diambil untuk dianalisa butiran untuk mengetahui karakteristik sedimennya. Hasil penelitian ini menunjukkan selama periode penelitian terdapat 4 jenis lamun, yaitu Enhalus acoroides,  Thalasia hemprichii, Cymodocea rotundata, dan Syringodium isoetifolium. Kerapatan tertinggi dan terendah ditemukan pada Thalassia hemprichii yaitu 33,87 dan 4,35 tegakan/m².  Persentase penutupan tertinggi ditemukan pada E. acoroides dengan nilai 48,67% dan yang terendah 8,71% oleh T. hemprichii. Terdapat variasi komposisi dan kerapatan berdasarkan waktu pengamatan, hal ini menunjukkan adanya pengaruh lingkungan dan tidak terjadi persebaran lamun yang merata pada daerah tersebut. Kata Kunci :  Enhalus acoroides,  Thalasia hemprichii, Cymodocea rotundata, dan Syringodium isoetifolium, variasi komposisi.

The threshold energy for atom displacement in fcc metals

1990 ◽  
Vol 48 (4) ◽  
pp. 530-531
Author(s):  
Wilfried Sigle ◽  
Matthias Hohenstein ◽  
Alfred Seeger
Keyword(s):  
Growth Rate ◽  
Elevated Temperatures ◽  
Threshold Energy ◽  
Dislocation Loops ◽  
Absolute Minimum ◽  
Voltage Electron ◽  
Atom Displacement ◽  
Electron Microscopes ◽  
Fcc Metal

Prolonged electron irradiation of metals at elevated temperatures usually leads to the formation of large interstitial-type dislocation loops. The growth rate of the loops is proportional to the total cross-section for atom displacement,which is implicitly connected with the threshold energy for atom displacement, Ed . Thus, by measuring the growth rate as a function of the electron energy and the orientation of the specimen with respect to the electron beam, the anisotropy of Ed can be determined rather precisely. We have performed such experiments in situ in high-voltage electron microscopes on Ag and Au at 473K as a function of the orientation and on Au as a function of temperature at several fixed orientations.Whereas in Ag minima of Ed are found close to <100>,<110>, and <210> (13-18eV), (Fig.1) atom displacement in Au requires least energy along <100>(15-19eV) (Fig.2). Au is thus the first fcc metal in which the absolute minimum of the threshold energy has been established not to lie in or close to the <110> direction.

SenCity – Evaluating Users’ Experiences of Intelligent Lighting for Well-Being in Smart Cities

2018 ◽  
pp. 60-67
Author(s):  
Henrika Pihlajaniemi ◽  
Anna Luusua ◽  
Eveliina Juntunen
Keyword(s):  
Case Studies ◽  
Smart City ◽  
Smart Cities ◽  
Well Being ◽  
Evaluation Methods ◽  
Data Analyses ◽  
Sense Of Security ◽  
System Data

This paper presents the evaluation of usersХ experiences in three intelligent lighting pilots in Finland. Two of the case studies are related to the use of intelligent lighting in different kinds of traffic areas, having emphasis on aspects of visibility, traffic and movement safety, and sense of security. The last case study presents a more complex view to the experience of intelligent lighting in smart city contexts. The evaluation methods, tailored to each pilot context, include questionnaires, an urban dashboard, in-situ interviews and observations, evaluation probes, and system data analyses. The applicability of the selected and tested methods is discussed reflecting the process and achieved results.

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>

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