scholarly journals Keterkaitan Megabentos yang Berasosiasi dengan Padang Lamun terhadap Karakteristik Lingkungan di Perairan Jepara

2021 ◽  
Vol 24 (2) ◽  
pp. 237-246
Author(s):  
Ita Riniatsih ◽  
Ambariyanto Ambariyanto ◽  
Ervia Yudiati
Keyword(s):  
Field Method ◽  
Habitat Characteristics ◽  
Shallow Waters ◽  
Line Transect ◽  
Seagrass Beds ◽  
Benthic Organisms ◽  
Seagrass Bed ◽  
Seagrass Cover ◽  
Line Transect Method ◽  
Abundance And Diversity

Seagrass bed are one of the ecosistems in shallow waters that can support the biodiversity of marine organisms. Megabenthos as benthic organisms that usually live in association in seagrass beds, have an important role in the food web in their habitat. This study aims to analyse the diversity of megabenthos associated with their habitat characteristics in seagrass waters in Bandengan, Teluk Awur and Panjang Island Jepara. This research was conducted using a descriptive field method, and megabenthos data collecting was carried out using the line transect method. Thr result showed that 158 individuals from 8 species of megabenthos were found (from 2 phyla: Echinodermata and Molluska) from three observation locations. Condition factors that influence the abundance and diversity of megabenthos are the substrat type and seagrass cover.   Padang lamun sebagai salah satu ekosistem di perairan laut dangkal dapat menopang keanekaragaman hayati organisme laut. Megabentos yang termasuk dalam organisme bentik merupakan organisme yang biasa hidup berasosiasi di padang lamun, mempunyai peranan penting dalam jaring-jaring makanan di habitatnya. Penelitian ini bertujuan untuk menganalisa keanekaragaman megabentos dikaitkan dengan karakteristik habitatnya di perairan padang lamun di Bandengan, Teluk Awur dan Pulau Panjang Jepara. Penelitian ini dilakukan dengan metoda deskriptif lapangan, dan pengambilan data megabentos dilakukan dengan metoda line transek. Hasil pengamatan menunjukkan ditemukan 158 individu dari 8 spesies  megabentos (dari 2 filum: Echinodermata dan Molluska) dari ketiga lokasi pengamatan.  Faktor kondisi yang berpengaruh terhadap kelimpahan dan keanekaragaman megabentos adalah jenis substrat dasar dan tutupan lamun.

scholarly journals STRUKTUR KOMUNITAS LAMUN DI MALANG RAPAT, BINTAN

2019 ◽  
Vol 4 (2) ◽  
pp. 148-159
Author(s):  
Wahyu Adi ◽  
Aditya Hikmat Nugraha ◽  
Yehiel Hendry Dasmasela ◽  
Agus Ramli ◽  
Calvyn Fredrik Aldus Sondak ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Line Transect ◽  
Percent Cover ◽  
Seagrass Beds ◽  
Seagrass Species ◽  
Substrate Type ◽  
Thalassia Hemprichii ◽  
Enhalus Acoroides ◽  
Present Information ◽  
Seagrass Cover

Padang lamun menyediakan banyak manfaat. Diperlukan penilaian tutupan lamun dan distribusi spasial spesies lamun, untuk memastikan manfaat dari padang lamun tetap ada. Penelitian ini dilakukan dengan metode kuadran disepanjang line transect, dan analisis data dilakukan untuk dapat menyajikan informasi tentang titik koordinat transek garis, persen tutupan lamun, persen tutupan spesies lamun, jenis substrat (pasir, lumpur dan pecahan karang), jumlah spesies Enhallus acoroides (tegakan/m2) dan distribusi spasial spesies lamun. Hasil penelitian menunjukkan kondisi padang lamun di wilayah studi sebagai kategori tutupan padat. Spesies lamun Thalassia hemprichii (Th) dan Enhalus acoroides (Ea) adalah spesies dominan dan menyebar ke seluruh wilayah penelitian.COMMUNITY STRUCTURE OF SEAGRASS IN MALANG RAPAT, BINTAN. Seagrass beds provide many benefits. Assessment of seagrass cover and spatial distribution of seagrass species is needed, to ensure the benefits of seagrass beds remain. The study was conducted using the quadratic method on the line transect, and the analysis was carried out to be able to present information about line transect coordinate points, percent cover of seagrass, percent cover of seagrass species, substrate type (sand, mud and rubble), number of species of Enhallus acoroides (shoot/m2) and spatial distribution of seagrass species. The results showed the condition of seagrass beds in the study area as a category of solid cover. Seagrass species Thalassia hemprichii (Th) and Enhalus acoroides (Ea) are dominant species and spread throughout the study area.

scholarly journals Seagrass Condition at Some Small Islands in The Taka Bonerate National Marine Park, South Sulawesi Indonesia

Jurnal Segara ◽  
2021 ◽  
Vol 17 (2) ◽  
pp. 83
Author(s):  
Indarto Happy Supriyadi ◽  
Hendrik Alexander William Cappenberg ◽  
Sam Wouthuyzen ◽  
Muhammad Hafizt ◽  
Susi Rahmawati ◽  
...  
Keyword(s):  
Reef Flat ◽  
Average Score ◽  
Small Islands ◽  
Seagrass Beds ◽  
Seagrass Bed ◽  
Marine Park ◽  
South Sulawesi ◽  
Seagrass Cover ◽  
Abiotic Variables ◽  
Macro Benthos

The assessment of seagrass bed condition in Indonesia still refers to the Decree of the State Minister for the Environment (KMNLH) no. 200 of 2004, which considers only one variable, namely the percentage of seagrass cover. To assess the seagrass beds condition to be more in-depth and meaningful, it is necessary to consider the addition of several variables, such as the biotic variables (seagrass species diversity including macroalgae and macro-benthos components) as well as the abiotic variables (reef flat areas and the substrate components). The purpose of this study is to determine the seagrass beds condition in several small islands in the Taka Bonerate National Marine Park by considering the additional analysis using both biotic and abiotic variables as mentioned above. The methodology used in this study is a combination of the use of the standard seagrass transect method, interpretation of satellite imagery related to the seagrass bottom habitat area, and its components on the reef flat of a particular island, as well as weighting and scoring based on those considered additional variables. By applying the criteria in the method, the seagrass bed conditions were then classified into three categories, namely seagrass in good, moderate, and unfavorable conditions, respectively. The results of the total score assessment on several small islands in Taka Bonerate Islands show that the seagrass bed in Latondu Besar Island is in good conditions with the highest score of (316) compared to Tarupa Besar, Jinato, Rajuni Kecil, and Tinabo Besar Islands with an average score of (173). The results of this study indicate that the assessment of seagrass conditions is more meaningful in terms of seagrass ecology than based on seagrass cover alone. However, this study requires a lot of validation for its application in assessing the condition of seagrass beds in other islands in Indonesia.

Small-scale effect of intertidal seagrass (Zostera muelleri) on meiofaunal abundance, biomass, and nematode community structure

2010 ◽  
Vol 91 (3) ◽  
pp. 579-591 ◽  
Author(s):  
Daniel Leduc ◽  
P. Keith Probert
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Spatial Scales ◽  
Nematode Community ◽  
Habitat Characteristics ◽  
Small Scale ◽  
Seagrass Beds ◽  
Seagrass Bed ◽  
Feeding Groups ◽  
The Impact

Seagrass beds are common features of coastal ecosystems worldwide, and their associated infauna are often more productive and diverse than in unvegetated habitats. Little is known, however, about the ecology of meiofaunal communities living in seagrass sediments. We compared the abundance and biomass of sediment meiofauna inside and outside an intertidalZostera muelleribed in southern New Zealand to assess the impact of seagrass cover on meiofaunal distribution. Nematode community structure, diversity, and feeding groups were also compared between habitats and sediment depths (0–2, 2–5 and 5–10 cm) to evaluate the effect of seagrass on nematode communities. Meiofaunal biomass was significantly higher inside than outside theZ. muelleribed, but secondary productivity inside the bed is likely to have been limited by the availability of labile organic matter. There were significant differences in nematode community structure between unvegetated, sparsely vegetated, and densely vegetated sites (102 m scale), as well as between sediment depths (cm scale). No significant differences were found in depth-integrated (0–10 cm) nematode diversity between sites, but vertical gradients in diversity differed between vegetated and unvegetated sites. Epistrate feeders were the most common feeding group in unvegetated sediments whereas most feeding groups were common inside the seagrass bed. Findings from this study indicate that seagrass beds can have a marked impact on infaunal structure and function over small spatial scales through their effect on sediment characteristics and organic matter input. Some unexpected trends observed in the present study, i.e. low meiofaunal biomass at the vegetated sites, and lower abundance of copepods inside than outside the seagrass bed, suggest that the nature of seagrass–invertebrate interactions may depend on habitat characteristics and the identity and ecology of species considered.

Pemetaan Pulau Kecil Gelasa Kabupaten Bangka Tengah

2019 ◽  
Vol 2 (1) ◽  
pp. 11-14
Author(s):  
Wahyu Adi
Keyword(s):  
Coral Reefs ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Image Interpretation ◽  
Vegetation Coverage ◽  
Small Island ◽  
Shallow Waters ◽  
Small Islands ◽  
Seagrass Beds ◽  
Cover Density

Pulau Kecil Gelasa merupakan daerah yang belum banyak diteliti. Pemetaan ekosistem di pulau kecil dilakukan dengan bantuan citra Advanced Land Observing Satellite (ALOS). Penelitian terdahulu diketahui bahwa ALOS memiliki kemampuan memetakan terumbu karang dan padang lamun di perairan dangkal serta mampu memetakan kerapatan penutupan vegetasi. Metode interpretasi citra menggunakan alogaritma indeks vegetasi pada citra ALOS yaitu NDVI (Normalized Difference Vegetation Index), serta pendekatan Lyzengga untuk mengkoreksi kolom perairan. Hasil penelitian didapatkan luasan Padang Lamun di perairan dangkal 41,99 Ha, luasan Terumbu Karang 125,57 Ha. Hasil NDVI di daratan/ pulau kecil Gelasa untuk Vegetasi Rapat seluas 47,62 Ha; luasan penutupan Vegetasi Sedang 105,86 Ha; dan penutupan Vegetasi Jarang adalah 34,24 Ha.   Small Island Gelasa rarely studied. Mapping ecosystems on small islands with the image of Advanced Land Observing Satellite (ALOS). Previous research has found that ALOS has the ability to map coral reefs and seagrass beds in shallow water, and is able to map vegetation cover density. The method of image interpretation uses the vegetation index algorithm in the ALOS image, NDVI (Normalized Difference Vegetation Index), and the Lyzengga approach to correct the water column. The results of the study were obtained in the area of Seagrass Padang in the shallow waters of 41.99 ha, the area of coral reefs was 125.57 ha. NDVI results on land / small islands Gelasa for dense vegetation of 47.62 ha; area of Medium Vegetation coverage 105.86 Ha; and the coverage of Rare Vegetation is 34.24 Ha.

Abundance Estimation of Diving Animals by the Double-Platform Line Transect Method

Biometrics ◽  
2003 ◽  
Vol 59 (3) ◽  
pp. 512-520 ◽  
Author(s):  
Hiroshi Okamura ◽  
Toshihide Kitakado ◽  
Kazuhiko Hiramatsu ◽  
Mitsuyo Mori
Keyword(s):  
Abundance Estimation ◽  
Line Transect ◽  
Line Transect Method

scholarly journals Density and Flock Size of the Raven (Corvus corax) In the Orawa - Nowy Targ Basin During Non-Breeding Season

Ring ◽  
2006 ◽  
Vol 28 (2) ◽  
pp. 119-125
Author(s):  
Michał Ciach ◽  
Dominik Wikar ◽  
Małgorzata Bylicka
Keyword(s):  
Breeding Season ◽  
Early Spring ◽  
Food Resources ◽  
High Density ◽  
Line Transect ◽  
Flock Size ◽  
Early Winter ◽  
Corvus Corax ◽  
Line Transect Method ◽  
Breeding Seasons

Density and Flock Size of the Raven (Corvus corax) In the Orawa - Nowy Targ Basin During Non-Breeding Season During the 2002/2003-2004/2005 non-breeding seasons the density of the Raven in the open habitats of the Orawa - Nowy Targ Basin was studied by line transect method. The results were analysed in four periods (autumn, early winter, winter and early spring). The median density of Ravens did not differ significantly between individual periods and was respectively: 3.5, 3.8, 4.8 and 3.8 indiv. / 10 km. Number of birds during particular controls varied from 1.0 to 24.8 indiv. / 10 km. However, while excluding flocks, the median density of single individuals and pairs of the Raven was considerably lower and in subsequent periods reached respectively: 2.2, 2.4, 2.2 and 1.7 indiv. / 10 km. Flock size did not differ significantly between individual periods. Single individuals and, less often, groups of two birds were recorded mostly. Small (3-5 indiv.) and medium (6-15 indiv.) flocks were recorded rarely and large flocks (16 indiv. and above) - only exceptionally. The high density and strong fluctuations of abundance of Ravens were determined by flocks presence, which was probably linked to irregular occurrence of food resources.

Evaluating habitat, prey, and mesopredator associations in a community of marine birds

2018 ◽  
Vol 75 (5) ◽  
pp. 1602-1612 ◽  
Author(s):  
Holly F Goyert ◽  
Beth Gardner ◽  
Richard R Veit ◽  
Andrew T Gilbert ◽  
Emily Connelly ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Habitat Characteristics ◽  
Offshore Wind ◽  
Line Transect ◽  
Marine Animals ◽  
Potential Conflict ◽  
Sediment Grain Size ◽  
Seabird Species ◽  
Marine Birds ◽  
Offshore Development

Abstract Offshore wind energy development on the US Atlantic Continental Shelf has brought attention to the need for marine spatial planning efforts to reduce potential conflict between wind turbines and marine animals, including seabirds. We evaluated the effects of marine mammals, fishes, and habitat characteristics on the distribution and relative abundance of marine birds off the coast of Delaware, Maryland, and Virginia. From May 2012 to 2014, we collected line transect data from 14 shipboard surveys, and novel high-resolution digital videography data from 14 aerial surveys. We compiled five habitat covariates: three static (distance to shore, sea floor slope, and sediment grain size), and two dynamic (sea surface temperature, salinity). We additionally analysed two seabird community covariates: the density of observed marine mammals and detected fish. Using zero-altered models, we tested our hypothesis that plunge-diving seabird species would show positive associations with marine mammals. Our results provide statistical evidence that, alongside competition, facilitative interactions occur among pelagic communities, where subsurface predators improve the detectability and accessibility of prey to surface-feeding seabirds. This study highlights the importance of quantifying community and ecological influences on avian abundance, particularly in predicting the potential exposure of marine birds and mammals to offshore development.

scholarly journals Descripción de la fauna de mosquitos (díptera culicidae) en el departamento formosa, provincia de formosa. República Argentina

2021 ◽  
Vol 2 (3) ◽  
pp. 4123-4129
Author(s):  
Carlos Blas Hoyos ◽  
Carlos Manuel Monzón
Keyword(s):  
Host Preference ◽  
Habitat Characteristics ◽  
Northeastern Region ◽  
The Family ◽  
The World ◽  
Abundance And Diversity

Resumen Una gran diversidad de especies ha sido descripta como miembros de la familia Culicidae. Ampliamente distribuidas por todo el mundo es reconocida su importancia, como vectores de diversas enfermedades. En la región del Nordeste Argentino se han producido aportes sistemáticos basados en las características de sus hábitats y la preferencia de sus hospedadores. En la provincia de Formosa se han citado solo 63 especies en contraste con los 94 citadas para la provincia del Chaco y 189 para la provincia de Misiones. El presente trabajo basó su estudio en la composición, abundancia y diversidad de la población de culícidos en el departamento Formosa.   Abstract A great diversity of species has been described as members of the family Culicidae. They are widely distributed all over the world and their importance as vectors of several diseases is well known. In the Northeastern region of Argentina, systematic contributions have been made based on their habitat characteristics and host preference. In the province of Formosa only 63 species have been cited in contrast to the 94 cited for the province of Chaco and 189 for the province of Misiones. The present work was based on the composition, abundance and diversity of the culicidae population in the department of Formosa.  

scholarly journals Intra and inter annual variation in a seagrass meadow on the Caribbean coast of Costa Rica: 2009-2015

2018 ◽  
Vol 66 (3) ◽  
pp. 1149 ◽  
Author(s):  
Margarita Loría-Naranjo ◽  
Jimena Samper-Villarreal ◽  
Marylaura Sandoval-Siles ◽  
Jorge Cortés
Keyword(s):  
Costa Rica ◽  
Leaf Area ◽  
Turnover Rate ◽  
Seagrass Meadow ◽  
Seagrass Beds ◽  
Seagrass Bed ◽  
Monitoring Methods ◽  
Caribbean Coast ◽  
Area Index ◽  
The Caribbean

Seagrass beds are an important ecosystem on the Caribbean coast of Costa Rica. At Cahuita National Park (CNP) a seagrass bed at Perezoso has been monitored continually since 1999 within the CARICOMP program. Thalassia testudinum is the dominant seagrass species, in some cases mixed with Syringodium filiforme. The results from the 2009 to 2015 monitoring period are presented here, and contrasted with data before 2009. Total (above and below ground tissue) mean biomass of T. testudinum was higher (1 255.4 ± 146.0 gm-2) than biomass before 2009, with an increasing tendency. However, productivity (1.5±0.59 gm-2d-1) and turnover rate (4.3 ± 1.22 %d-1) were lower than previous monitoring periods. In this period, mean leaf area diminished considerably (4.9 ± 2.30 m2), but leaf area index (LAI) increased (1.9 ± 0.80 m2leafm-2) in comparison to prior monitoring. Productivity, density, turnover rate, LAI and biomass showed intra-annual variations; while mean biomass of T. testudinum did not vary significantly among years. No correlations were found between water salinity, temperature and clarity with seagrass measurements. However, most seagrass parameters were strongly correlated with precipitation. These results highlight the effect of external environmental agents acting on the ecosystem. CNP presents a long-term stable seagrass meadow. However, there are indirect signals, such as high biomass and above-ground biomass proportion, along with low productivity and LAI, which point to a nutrient increment in Perezoso’s seagrass bed. To continue protecting this seagrass bed, it is necessary to improve monitoring methods, and seagrass beds should be included in national conservation policies and monitoring programs.

scholarly journals STUDI EKOLOGI SUMBERDAYA TERIPANG DI NEGERI PORTO PULAU SAPARUA MALUKU TENGAH

2014 ◽  
Vol 1 (1) ◽  
pp. 32-42
Author(s):  
Yona Aksa Lewerissa
Keyword(s):  
Sea Cucumber ◽  
Water Environment ◽  
Turbidity Current ◽  
Line Transect ◽  
Community Structures ◽  
Sea Cucumbers ◽  
Environment Factors ◽  
Line Transect Method ◽  
Environment Measurement

Background: Decreasing of sea cucumber resources on numbers and size of fishing capture in Negeri Porto waters influenced its community structures. Further, water environment steadiness will questionable. For this reason, study was done to analyzed community structures of sea cucumbers include of numbers species found, density, potency, species presence frequency, distribute pattern, ecology index and environment measurement. Method: Research done on February to May, 2008 at Negeri Porto used Line Transect Method. Result: showed there were eight species of sea cucumbers found (potency as much as 12.286 individuals). Bohadschia marmorata got highest in numbers species found, density, potency and species presence frequency. There were three distribute pattern of sea cucumbers found wich are uniform, random and group. Conclusion: Sea cucumbers diversity was in lower, species are closed to compatible. B. marmorata and Holothuria edulis are tends to dominate this water. Environment factors such temperature, pH, salinity, DO, turbidity, current and sediment distribute showed that Porto waters was suitable to sea cucumbers growth.

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