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Articoli di riviste sul tema "Seagrasses"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Batuwael, Anggi Wawan, and Dominggus Rumahlatu. "ASOSIASI GASTROPODA DENGAN TUMBUHAN LAMUN DI PERAIRAN PANTAI NEGERI TIOUW KECAMATAN SAPARUA KABUPATEN MALUKU TENGAH." Biopendix: Jurnal Biologi, Pendidikan dan Terapan 4, no. 2 (2019): 109–16. http://dx.doi.org/10.30598/biopendixvol4issue2page109-116.

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Background: Seagrasses are flowering plants (Angiosperms) that are able to adapt fully in waters with high salinity or live immersed in water. Seagrass has true rhizomes, leaves and roots like plants on land. Seagrasses usually form fields called seagrass beds, especially in tropical and sub-tropical regions. The existence of seagrasses is known to support fishing activities, shellfish communities and other invertebrate biota. Method: This study is a descriptive study to reveal information about environmental characteristics, and associations of seagrasses with gastropods. Results:

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Ierodiaconou, Daniel A., and Laurie J. B. Laurenson. "Estimates of Heterozostera tasmanica, Zostera muelleri and Ruppia megacarpa distribution and biomass in the Hopkins Estuary, western Victoria, by GIS." Australian Journal of Botany 50, no. 2 (2002): 215. http://dx.doi.org/10.1071/bt00093.

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Knowledge of the spatial arrangement of the seagrass distribution and biomass within the Hopkins Estuary is an essential step towards gaining an understanding of the functioning of the estuarine ecosystem. This study marks the first attempt to map seagrass distribution and model seagrass biomass and epiphyte biomass along depth gradients by the use of global positioning system (GPS) and geographical information system (GIS) technologies in the estuary. For mapping seagrass in small estuaries, ground-surveying the entire system is feasible. Three species of seagrasses, Heterozostera tasmanica (

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Short, Frederick T., and Sandy Wyllie-Echeverria. "Natural and human-induced disturbance of seagrasses." Environmental Conservation 23, no. 1 (1996): 17–27. http://dx.doi.org/10.1017/s0376892900038212.

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SummaryMany natural and human-induced events create disturbances in seagrasses throughout the world, but quantifying losses of habitat is only beginning. Over the last decade, 90000 ha of seagrass loss have been documented although the actual area lost is certainly greater. Seagrasses, an assemblage of marine flowering plant species, are valuable structural and functional components of coastal ecosystems and are currently experiencing worldwide decline. This group of plants is known to support a complex trophic food web and a detritus-based food chain, as well as to provide sediment and nutrie

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Burkholder, Derek A., Michael R. Heithaus, and James W. Fourqurean. "Feeding preferences of herbivores in a relatively pristine subtropical seagrass ecosystem." Marine and Freshwater Research 63, no. 11 (2012): 1051. http://dx.doi.org/10.1071/mf12029.

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Understanding forage choice of herbivores is important for predicting the potential impacts of changes in their abundance. Such studies, however, are rare in ecosystems with intact populations of both megagrazers (sirenians, sea turtles) and fish grazers. We used feeding assays and nutrient analyses of seagrasses to determine whether forage choice of grazers in Shark Bay, Australia, are influenced by the quality of seagrasses. We found significant interspecific variation in removal rates of seagrasses across three habitats (shallow seagrass bank interior, shallow seagrass bank edge, deep), but

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5

J. Lee Long, W., R. G. Coles, and L. J. McKenzie. "Issues for seagrass conservation management in Queensland." Pacific Conservation Biology 5, no. 4 (1999): 321. http://dx.doi.org/10.1071/pc000321.

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Coastal, reef-associated and deepwater (> 15 m) seagrass habitats form a large and ecologically important community on the Queensland continental shelf. Broad-scale resource inventories of coastal seagrasses were completed in the 1980s and were used in marine park and fisheries zoning to protect some seagrasses. At least eleven of the fifteen known species in the region reach their latitudinal limits of distribution in Queensland and at least two Halophila species may be endemic to Queensland or northeastern Australia. The importance of seagrasses to Dugongs Dugong dugon, Green Turtles Chel

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Omollo, Derrick, Virginia Wang’ondu, Michael Githaiga, Daniel Gorman, and James Kairo. "The Contribution of Subtidal Seagrass Meadows to the Total Carbon Stocks of Gazi Bay, Kenya." Diversity 14, no. 8 (2022): 646. http://dx.doi.org/10.3390/d14080646.

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Seagrass beds occur globally in both intertidal and subtidal zones within shallow marine environments, such as bays and estuaries. These important ecosystems support fisheries production, attenuate strong wave energies, support human livelihoods and sequester large amounts of CO2 that may help mitigate the effects of climate change. At present, there is increased global interest in understanding how these ecosystems could help alleviate the challenges likely to face humanity and the environment into the future. Unlike other blue carbon ecosystems, i.e., mangroves and saltmarshes, seagrasses ar

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7

Samper-Villarreal, Jimena. "Seagrasses in the Eastern Tropical Pacific: species, distribution ecology, blue carbon, and threats." Latin American Journal of Aquatic Research 52, no. 3 (2024): 336–49. http://dx.doi.org/10.3856/vol52-issue3-fulltext-3167.

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Eastern Tropical Pacific (ETP) seagrasses are composed of three genera and four species: Halophila baillonii, Halodule beaudettei, Halodule wrightii, and Ruppia maritima. These are colonizing seagrass species and meadows in the ETP can be ephemeral. Current seagrass distribution in this region remains unknown, with verified extant presence at a limited number of locations and mapping heavily reliant on historical reports. Suitable environmental conditions for seagrasses in the ETP consist of sheltered bays <10 m depth with fine sediment, 19-35 salinity, 26-32°C temperature, and water transp

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Ameen, Hazeena M., Ayona Jayadev, Geena Prasad, and Deepa Indira Nair. "Seagrass Meadows: Prospective Candidates for Bioactive Molecules." Molecules 29, no. 19 (2024): 4596. http://dx.doi.org/10.3390/molecules29194596.

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Seagrass meadows consist of angiosperms that thrive fully submerged in marine environments and form distinct ecosystems. They provide essential support for many organisms, acting as nursery grounds for species of economic importance. Beyond their ecological roles, seagrasses and their associated microbiomes are rich sources of bioactive compounds with the potential to address numerous human healthcare challenges. Seagrasses produce bioactive molecules responding to physical, chemical, and biological environmental changes. These activities can treat microbe-borne diseases, skin diseases, diabet

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Pollard, PC, and M. Greenway. "Photosynthetic characteristics of seagrasses (Cymodocea serrulata, Thalassia hemprichii and Zostera capricornia) in a low-light environment, with a comparison of leaf-marking and lacunal-gas measurements of productivity." Marine and Freshwater Research 44, no. 1 (1993): 127. http://dx.doi.org/10.1071/mf9930127.

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We describe the photosynthetic characteristics of three seagrasses and the relationship between their production and natural light intensities (photosynthesis-irradiance response, i.e. PI curves). Seagrass production (gross production minus shoot respiration) was measured in the field by the rate of gas release from the lacuna1 space of whole seagrass shoots and compared with net leaf production. Field work was carried out on the seagrasses Cymodocea serrulata (R. Br.) Aschers, and Magnus, Thalassia hemprichii (Ehrenb.) Aschers., and Zostera capricornia Aschers. in the turbid, warm waters of C

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Lavery, Paul. "Marine Management: Marine Conservation." Pacific Conservation Biology 5, no. 4 (1999): 240. http://dx.doi.org/10.1071/pc00240a.

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The research papers in this volume highlight some of the major issues in marine conservation and offer some exciting insights into future directions for research and management. It is particularly pleasing that the issue focuses on seagrasses, a component of marine biodiversity that is well recognized and with profound ecological significance, but has suffered widespread decline in its distribution over the past half century. The absence of any accurate inventory of seagrass resources makes it difficult to accurately assess the cumulative impact of human activity on them. However, the need to

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Hwang, Charnsmorn, Chih-Hua Chang, Michael Burch, Milena Fernandes, and Tim Kildea. "Effects of Epiphytes and Depth on Seagrass Spectral Profiles: Case Study of Gulf St. Vincent, South Australia." International Journal of Environmental Research and Public Health 16, no. 15 (2019): 2701. http://dx.doi.org/10.3390/ijerph16152701.

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Seagrasses are a crucial indicator species of coastal marine ecosystems that provide substratum, shelter, and food for epiphytic algae, invertebrates, and fishes. More accurate mapping of seagrasses is essential for their survival as a long-lasting natural resource. Before reflectance spectra could properly be used as remote sensing endmembers, factors that may obscure the detection of reflectance signals must be assessed. The objectives in this study are to determine the influence of (1) epiphytes, (2) water depth, and (3) seagrass genus on the detection of reflectance spectral signals. The r

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Unsworth, Richard K. F., Leanne C. Cullen-Unsworth, Benjamin L. H. Jones, and Richard J. Lilley. "The planetary role of seagrass conservation." Science 377, no. 6606 (2022): 609–13. http://dx.doi.org/10.1126/science.abq6923.

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Seagrasses are remarkable plants that have adapted to live in a marine environment. They form extensive meadows found globally that bioengineer their local environments and preserve the coastal seascape. With the increasing realization of the planetary emergency that we face, there is growing interest in using seagrasses as a nature-based solution for greenhouse gas mitigation. However, seagrass sensitivity to stressors is acute, and in many places, the risk of loss and degradation persists. If the ecological state of seagrasses remains compromised, then their ability to contribute to nature-b

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Fraser, Matthew W., Gary A. Kendrick, Pauline F. Grierson, James W. Fourqurean, Mathew A. Vanderklift, and Diana I. Walker. "Nutrient status of seagrasses cannot be inferred from system-scale distribution of phosphorus in Shark Bay, Western Australia." Marine and Freshwater Research 63, no. 11 (2012): 1015. http://dx.doi.org/10.1071/mf12026.

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Differences in phosphorus (P) availability can influence the ecology and physiology of seagrass communities; and are usually inferred from changes in the relative P content in seagrass leaves. Shark Bay is a subtropical marine embayment, with decreasing P concentrations in the water column and sediments from north to south across the entire embayment. We examined the P and nitrogen (N) content of seagrass leaves and P content of sediments across the Faure Sill and Wooramel delta region of Shark Bay, to determine whether the leaf content of seagrasses in Shark Bay also decreased from north to s

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Seng, Nicholas, Samantha Lai, Jenny Fong, et al. "Early evidence of microplastics on seagrass and macroalgae." Marine and Freshwater Research 71, no. 8 (2020): 922. http://dx.doi.org/10.1071/mf19177.

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Microplastic accumulation on marine macrophytes, such as macroalgae and seagrasses, is a potentially critical but overlooked pathway by which microplastics enter the marine food web. Despite the possible significance of this pathway, few studies have examined the presence of microplastics on macrophytes found in situ. We quantified the density of microplastics found on the surfaces of three species of intertidal seagrasses (Cymodocea rotundata, Cymodocea serrulata and Thalassia hemprichii) and two species of subtidal macroalgae (Padina sp. and Sargassum ilicifolium), and found significantly hi

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Göksal, Enes, Büşra Nur Kuruoğlu, İnci Tüney Kızılkaya, and Esra Öztürk Yiğit. "Experimental Strategies on Climate Change Impacts: Climate Chamber Approach for Seagrass Meadows." Erzincan Üniversitesi Fen Bilimleri Enstitüsü Dergisi, SUIC (December 31, 2024): 15–24. https://doi.org/10.18185/erzifbed.1500312.

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Seagrasses are vital to marine ecosystems, providing stability to coastal areas, acting as significant carbon sinks and supporting biodiversity. However, environmental changes, particularly climate change, are threatening seagrass habitats. The global extinction rate of seagrasses has increased significantly, with notable losses in the Mediterranean Sea. This decline is attributed to pollution, climate change, and rising temperatures, which impact seagrass growth, reproduction, and survival. To study these effects, climate chamber systems simulating future climate scenarios were used. These sy

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Jones, Cynthia M. "Can we predict the future: juvenile finfish and their seagrass nurseries in the Chesapeake Bay." ICES Journal of Marine Science 71, no. 3 (2013): 681–88. http://dx.doi.org/10.1093/icesjms/fst142.

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Abstract The importance of estuarine seagrass beds as nurseries for juvenile fish has become a universal paradigm, especially for estuaries that are as important as the Chesapeake Bay. Yet, scientific tests of this hypothesis were equivocal depending on species, location, and metrics. Moreover, seagrasses themselves are under threat and one-third of seagrasses have disappeared worldwide with 65% of their losses occurring in estuaries. Although there have been extensive studies of seagrasses in the Chesapeake Bay, surprisingly few studies have quantified the relationship between seagrass as nur

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Han, Qiuying, Wenxue Che, Hui Zhao, et al. "Effects of Aquaculture and Thalassia testudinum on Sediment Organic Carbon in Xincun Bay, Hainan Island." Water 16, no. 2 (2024): 338. http://dx.doi.org/10.3390/w16020338.

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Eutrophication due to aquaculture can cause the decline of seagrasses and impact their carbon storage capacity. This study explored the effects of aquaculture on the sediment organic carbon (SOC) in Thalassia testudinum seagrass beds using enzyme activity and microorganisms as indicators. Our results showed that the distance to aquaculture significantly increased the SOC and TN of sediments; the C/N ratio of sediments was reduced by the distance to aquaculture. Distance to aquaculture and seagrasses significantly impacted the δ13C of sediments, and their significant interactive effects on the

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Namoua, Dilivia J., Adnan S. Wantasen, Khristin I. F. Kondoy, Rene Ch Kepel, Febry S. I. Menajang, and Wilmy Pelle. "Carbon Absorption in Seagrasses in Tongkaina Coastal Waters, Bunaken District, Manado City, North Sulawesi." Jurnal Ilmiah PLATAX 10, no. 2 (2022): 433. http://dx.doi.org/10.35800/jip.v10i2.43485.

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This study was conducted to determine the types of seagrasses and calculate biomass and calculate how much carbon absorption in seagrasses was found in the location of Tongkaina Beach, Bunaken District, Manado City, North Sulawesi. The sampling procedure in the field is the method of cruising surveys. A cruising survey is a sample collection method that is carried out by walking through the coastal area of all seagrasses found. After the sampling at the site is completed, the sample in the inventory is then photographed. The samples that have been obtained are analyzed in the laboratory using

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Wasniatun, Wasniatun. "Literature Review: Ekosistem Lamun sebagai Bioindikator Pencemaran Lingkungan Pesisir." Biocaster : Jurnal Kajian Biologi 4, no. 3 (2024): 114–21. http://dx.doi.org/10.36312/biocaster.v4i3.299.

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Seagrass ecosystems are among the ecosystems found in coastal areas. Seagrass beds consist of one or more seagrass species interacting with biotic and abiotic factors in their environment. The objective of this study is to describe the potential of seagrass ecosystems as bioindicators of coastal environmental pollution. The method used in writing this article is a literature review. Articles were collected through literature searches using selected sources (databases) such as Google Scholar. The search covered journal articles published from 2013 to 2023. The research results show that seagras

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Dilipan, Elangovan, Jutta Papenbrock, and Thirunavakkarasu Thangaradjou. "Random amplified polymorphic DNA (RAPD) finger prints evidencing high genetic variability among marine angiosperms of India." Journal of the Marine Biological Association of the United Kingdom 97, no. 6 (2016): 1307–15. http://dx.doi.org/10.1017/s0025315416000631.

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In India 14 seagrass species can be found with monospecific genera (Enhalus, ThalassiaandSyringodium),Cymodoceawith two species andHalophilaandHalodulerepresented by more than two taxonomically complex species. Considering this, the present study was made to understand the level and pattern of genetic variability among these species collected from Tamilnadu coast, India. Random amplified polymorphic DNA (RAPD) analysis was used to evaluate the level of polymorphism existing between the species. Out of the 12 primers tested, 10 primers amplified 415 DNA fragments with an average of 41.5 fragmen

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van Wyk, Johanna W., Janine B. Adams, and Sophie von der Heyden. "Conservation implications of herbicides on seagrasses: sublethal glyphosate exposure decreases fitness in the endangered Zostera capensis." PeerJ 10 (November 15, 2022): e14295. http://dx.doi.org/10.7717/peerj.14295.

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Worldwide seagrass populations are in decline, calling for urgent measures in their conservation. Glyphosate is the most widely used herbicide globally, leading to increasing concern about its ecological impact, yet little is known about the prevalence or impact of glyphosate on seagrasses. In this study, we investigated the effect of sublethal glyphosate exposure on the endangered seagrass, Zostera capensis, to identify effects on growth, photosynthetic pigments and leaf morphology as measures of seagrass fitness. Seagrasses were exposed to a single dose of a commercial glyphosate formulation

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Luong, Cao Van, Nguyen Manh Linh, Vu Manh Hung, Dam Duc Tien, Dau Van Thao, and Tran Dinh Lan. "The status of seagrass communities in the Truong Sa archipelago." Tạp chí Khoa học và Công nghệ biển 20, no. 3 (2020): 285–95. http://dx.doi.org/10.15625/1859-3097/20/3/15076.

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Seagrasses in Truong Sa archipelago have not been intensively studied and understood, even in some obviously progressive works recently published. It is essential to carry out much more researches to fill up understanding gaps of seagrasses in the area. In 2019, within the framework of the project coded KC09.29/16–20, two surveys were conducted for three selected islands (Truong Sa Lon, Thuyen Chai and Song Tu Tay) in the area, focusing on marine ecosystems including seagrass beds. Survey results in the selected islands show eight seagrass species (one new record), the estimated total distribu

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Naufal, Mohammed, and Gadi Padmavati. "Ethnobotany of three sea grass species from Port Blair, a step towards its conservation in Andaman Islands." Journal of Tropical Life Science 11, no. 1 (2021): 11–16. http://dx.doi.org/10.11594/jtls.11.01.02.

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Ethno-phycology is the study of the relationships of human society to flora and its ecosystem. In the marine world, ethno-biology is a thriving area of research which have yielded valuable ethno-biological knowledge. The main goal of the present study was to understand the effect of abiotic factors as well as the natural and anthropogenic disturbances that shape seagrass community in Andaman Island and to reveal the knowledge of the local people, about the significance of seagrass habitat and its conservation. The qualitative study on distribution of seagrasses in Chidiyatapu (11° 29' 30" to 1

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Siahaya, Chalvin Salmon, Prelly Marsell Jolanda Tuapattinaya, and Stevin Melay. "DIVERSITY PHENETICS OF TYPES SEAGRASS IN VILLAGE POKA BEACH MALUKU BASED ON MORPHOMETRICS." RUMPHIUS Pattimura Biological Journal 4, no. 2 (2022): 062–66. http://dx.doi.org/10.30598/rumphiusv4i2p062-066.

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This research aims to determine the phenetic diversity of seagrass species in the coastal waters of Poka Village based on morphometrics. This research is a type of descriptive research, in which morphometric measurements are carried out to determine the phenetic diversity of seagrass species. Meanwhile, for kinship relationships between seagrasses. Software is used past 4.0. The results of this research were that four types of seagrass were found, namely Thalasssia hemprichii, Enhalus acoroides, Halophila pinifolia and Halophila ovalis. This indicates that the Poka Village beach has a high phe

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Copertino, Margareth S., Joel C. Creed, Marianna O. Lanari, et al. "Seagrass and Submerged Aquatic Vegetation (VAS) Habitats off the Coast of Brazil: state of knowledge, conservation and main threats." Brazilian Journal of Oceanography 64, spe2 (2016): 53–80. http://dx.doi.org/10.1590/s1679-875920161036064sp2.

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Abstract Seagrass meadows are among the most threatened ecosystems on earth, raising concerns about the equilibrium of coastal ecosystems and the sustainability of local fisheries. The present review evaluated the current status of the research on seagrasses and submerged aquatic vegetation (SAV) habitats off the coast of Brazil in terms of plant responses to environmental conditions, changes in distribution and abundance, and the possible role of climate change and variability. Despite an increase in the number of studies, the communication of the results is still relatively limited and is ma

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Coles, RG, WJ Lee Long, RA Watson, and KJ Derbyshire. "Distribution of seagrasses, and their fish and penaeid prawn communities, in Cairns harbour, a tropical estuary, Northern Queensland, Australia." Marine and Freshwater Research 44, no. 1 (1993): 193. http://dx.doi.org/10.1071/mf9930193.

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From aerial photography (July 1987) and diving surveys (February 1988), 876 ha of seagrasses (eight species) were mapped in Cairns Harbour, tropical north-eastern Queensland. Zostera capricorni was the most common seagrass species and had the greatest biomass at 79 g m-2 dry weight of stems and leaves and 180 g m-2 dry weight of roots and rhizomes. The maximum shoot density found was 4798 shoots m-2 of Halodule pinifolia, the second most common species. Seagrasses were found only between 0.5 and 5.0 m below mean sea level. Zostera capricorni was found at the shallowest depths, Halodule pinifol

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Leemans, Luuk, Isis Martínez, Tjisse van der Heide, Marieke M. van Katwijk, and Brigitta I. van Tussenbroek. "A Mutualism Between Unattached Coralline Algae and Seagrasses Prevents Overgrazing by Sea Turtles." Ecosystems 23, no. 8 (2020): 1631–42. http://dx.doi.org/10.1007/s10021-020-00492-w.

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AbstractSeagrass meadows are threatened biodiversity hot spots that provide essential ecosystem services. Green sea turtles may overgraze meadows, further enhancing seagrass decline. However, we observed an unexpected, remarkable recovery of seagrasses in a previously overgrazed meadow with abundant unattached branched coralline algae, suggesting that turtle grazing had ceased. We hypothesize that this recovery is due to an effective grazing-protection mutualism, in which the spiny coralline algae structures protect the seagrass meadows from overgrazing, while the seagrasses protect the algae

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Wardono, Suko, Elland Yupa Sobhytta, I. Gusti Ngurah Agung Dhananjaya, et al. "Association Analysis of Seagrass Coverage and Human Activities in Nusa Lembongan." Jurnal Biodjati 7, no. 2 (2022): 247–58. http://dx.doi.org/10.15575/biodjati.v7i2.20307.

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Nusa Lembongan has high marine biodiversity, including seagrass. Seagrass is a plant that lives submerged in a marine or estuary water that functions as a nursery ground, trapping sediment, and beach protector, so it is important to know the condition of seagrass coverage, especially in Nusa Lembongan for managing the Nusa Penida Marine Protected Area. This study aimed to understand the condition of seagrass coverage and the factors influencing the existence of its ecosystem in Nusa Lembongan. According to reslut in two stations, it was found that six of the twelve types of seagrasses in Indon

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Sidi Cheikh, Mohamed Ahmed, Salomão Bandeira, Seydouba Soumah, et al. "Seagrasses of West Africa: New Discoveries, Distribution Limits and Prospects for Management." Diversity 15, no. 1 (2022): 5. http://dx.doi.org/10.3390/d15010005.

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The onset of a major seagrass initiative in West Africa enabled important seagrass discoveries in several countries, in one of the least documented seagrass regions in the world. Four seagrass species occur in western Africa, Cymodocea nodosa, Halodule wrightii, Ruppia maritima and Zostera noltei. An area of about 62,108 ha of seagrasses was documented in the studied region comprising seven countries: Mauritania, Senegal, The Gambia, Guinea Bissau, Guinea, Sierra Leone and Cabo Verde. Extensive meadows of Zostera noltei were recorded for the first time at Saloum Delta, Senegal, which represent

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Emmclan, Lau Sheng Hann, Muta Harah Zakaria, Shiamala Devi Ramaiya, Ikhsan Natrah, and Japar Sidik Bujang. "Morphological and biochemical responses of tropical seagrasses (Family: Hydrocharitaceae) under colonization of the macroalgae Ulva reticulata Forsskål." PeerJ 10 (January 18, 2022): e12821. http://dx.doi.org/10.7717/peerj.12821.

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Background Coastal land development has deteriorated the habitat and water quality for seagrass growth and causes the proliferation of opportunist macroalgae that can potentially affect them physically and biochemically. The present study investigates the morphological and biochemical responses of seagrass from the Hydrocharitaceae family under the macroalgal bloom of Ulva reticulata, induced by land reclamation activities for constructing artificial islands. Methods Five seagrass species, Enhalus acoroides, Thalassia hemprichii, Halophila ovalis, Halophila major, and Halophila spinulosa were

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Beer, Sven, Mats Bjork, Frida Hellblom, and Lennart Axelsson. "Inorganic carbon utilization in marine angiosperms (seagrasses)." Functional Plant Biology 29, no. 3 (2002): 349. http://dx.doi.org/10.1071/pp01185.

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The mechanisms by which marine angiosperms, or seagrasses, utilize external inorganic carbon (Ci) include, in addition to uptake of CO2 formed spontaneously from HCO3–: (i) extracellular carbonic anhydrasemediated conversion of HCO3– to CO2 at normal seawater pH, or in acid zones created by H+ extrusion, and (ii) H+-driven utilization (direct uptake?) of HCO3–. The latter mechanism was recently indicated for Zostera marina, Halophila stipulaceaand Ruppia maritima, and manifested itself as a sensitivity of photosynthesis to buffers, as well as a relative insensitivity to acetazolamide under buf

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32

Ahmad-Kamil, E. I., R. Ramli, S. A. Jaaman, J. Bali, and J. R. Al-Obaidi. "The Effects of Water Parameters on Monthly Seagrass Percentage Cover in Lawas, East Malaysia." Scientific World Journal 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/892746.

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Abstract (sommario):

Seagrass is a valuable marine ecosystem engineer. However, seagrass population is declining worldwide. The lack of seagrass research in Malaysia raises questions about the status of seagrasses in the country. The seagrasses in Lawas, which is part of the coral-mangrove-seagrass complex, have never been studied in detail. In this study, we examine whether monthly changes of seagrass population in Lawas occurred. Data on estimates of seagrass percentage cover and water physicochemical parameters (pH, turbidity, salinity, temperature, and dissolved oxygen) were measured at 84 sampling stations es

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33

Bongga, Marthen, Calvyn F. A. Sondak, Deisle RH Kumampung, Kakaskasen A. Roeroe, Sandra Olivia Tilaar, and Joudy Sangari. "KAJIAN KONDISI KESEHATAN PADANG LAMUN DI PERAIRAN MOKUPA KECAMATAN TOMBARIRI KABUPATEN MINAHASA." JURNAL PESISIR DAN LAUT TROPIS 9, no. 3 (2021): 44. http://dx.doi.org/10.35800/jplt.9.3.2021.36519.

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Abstract (sommario):

Seagrass ecosystems services in the coastal waters are included as primary producers, nutrient recycler, bottom stabilizers, sediment traps, and erosion barriers. Gleaning fisheries in seagrass bed in Mokupa waters could cause damage on seagrass, that can be marked by changes in seagrass cover. The purposes of this study were to identify the types of seagrasses and to determine the health condition of seagrass bed ecosystem in Mokupa waters. The research method used in this study is quadrat transect method. Data collection was carried out by laid three transects (100 m) with distance between e

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34

Jason G. Tuang-tuang. "Thriving Seagrasses in Rocky Sandy Substrate in Tinabilan, Northwest Leyte, Philippines." East Asian Journal of Multidisciplinary Research 1, no. 9 (2022): 1881–86. http://dx.doi.org/10.55927/eajmr.v1i9.1258.

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Abstract (sommario):

The coastline of Palompon, Leyte has endowed with rich seagrass abundance and diversity which supports the well-established Siganid industry. Baseline information on the cover and species composition were gathered using the transect-quadrat method. Results showed that there were four (4) species of seagrasses identified in the coastal area of Tinabilan, Palompon, Leyte. Cymodocea rotundata and Thalassia hemprichii were observed in all the sampling stations. The average percentage cover of seagrasses was 8.36% which revealed in poor condition. However, the poor percentage cover condition can be

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35

Muhaemin, Moh, Mohammad Fadhil Priambodo, Oktora Susanti, and Eko Efendi. "THE INITIAL ECHINODERMS COMMUNITY STRUCTURE IN SEAGRASS BED OF MARINE TOURISM AREA: MAHITAM ISLAND AND KETAPANG BEACH, LAMPUNG." AQUASAINS 12, no. 1 (2023): 1422. http://dx.doi.org/10.23960/aqs.v12i1.p1422-1434.

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Abstract (sommario):

Lampung is one of national marine tourism destination. Seagrass is one of fragile coastal ecosystem and it is a habitat and feeding ground for a number of Echinoderms species. Echinodermata are nutrient recyclers that will in turn provide benefits to the seagrass ecosystem. This research aimed to assess the community structure of Echinoderms and seagrass as well as the relationship between Echinoderms abundance, seagrass densities, and water quality in Mahitam Island and Ketapang Beach. Observations were conducted at 7 stations, namely 3 stations on Ketapang Beach and 4 stations on Mahitam Isl

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36

Udy, James W., and William C. Dennison. "Physiological responses of seagrasses used to identify anthropogenic nutrient inputs." Marine and Freshwater Research 48, no. 7 (1997): 605. http://dx.doi.org/10.1071/mf97001.

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Abstract (sommario):

Fertilization experiments have established that seagrass growth in Moreton Bay can be limited by the supply of both N and P. In the present study, morphological and physiological characteristics (canopy height, shoot density, biomass, growth, tissue nutrient content, amino acid concentrations and δ15N ratios) of Zostera capricorni Aschers. in Moreton Bay, close to and distant from nutrient sources, were compared. Z. capricorni at the four sites close to nutrient sources (sewage, septic or prawn-farm effluent, or river discharge), had physiological characteristics representative of high nutrien

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37

van Katwijk, Marieke M., and Brigitta I. van Tussenbroek. "Facultative Annual Life Cycles in Seagrasses." Plants 12, no. 10 (2023): 2002. http://dx.doi.org/10.3390/plants12102002.

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Abstract (sommario):

Plant species usually have either annual or perennial life cycles, but facultative annual species have annual or perennial populations depending on their environment. In terrestrial angiosperms, facultative annual species are rare, with wild rice being one of the few examples. Our review shows that in marine angiosperms (seagrasses) facultative annual species are more common: six (of 63) seagrass species are facultative annual. It concerns Zostera marina, Z. japonica, Halophila decipiens, H. beccarii, Ruppia maritima, and R. spiralis. The annual populations generally produce five times more se

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38

York, Paul H., Peter I. Macreadie, and Michael A. Rasheed. "Blue Carbon stocks of Great Barrier Reef deep-water seagrasses." Biology Letters 14, no. 12 (2018): 20180529. http://dx.doi.org/10.1098/rsbl.2018.0529.

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Abstract (sommario):

Shallow-water seagrasses capture and store globally significant quantities of organic carbon (OC), often referred to as ‘Blue Carbon’; however, data are lacking on the importance of deep-water (greater than 15 m) seagrasses as Blue Carbon sinks. We compared OC stocks from deep-, mid- and shallow-water seagrasses at Lizard Island within the Great Barrier Reef (GBR) lagoon. We found deep-water seagrass ( Halophila species) contained similar levels of OC to shallow-water species (e.g. Halodule uninervis ) (0.64 ± 0.08% and 0.9 ± 0.1 mg C cm −3 , 0.87 ± 0.19% and 1.3 ± 0.3 mg C cm −3 , respectivel

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39

Farid, M. A., S. Rasidi, and M. P. Patria. "THE COMMUNITY STRUCTURE OF SEAGRASS IN ENGGANO ISLANDS, BENGKULU." Marine Research in Indonesia 33, no. 1 (2008): 7–10. http://dx.doi.org/10.14203/mri.v33i1.501.

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Abstract (sommario):

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 dominat

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40

Zabarte-Maeztu, Iñigo, Fleur E. Matheson, Merilyn Manley-Harris, Robert J. Davies-Colley, Megan Oliver, and Ian Hawes. "Effects of Fine Sediment on Seagrass Meadows: A Case Study of Zostera muelleri in Pāuatahanui Inlet, New Zealand." Journal of Marine Science and Engineering 8, no. 9 (2020): 645. http://dx.doi.org/10.3390/jmse8090645.

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Abstract (sommario):

Seagrass meadows are vulnerable to fine sediment (mud) pollution, with impacts usually attributed to reduction in submerged light. Here we tested two non-exclusive hypotheses, that mud particles (<63 µm) impact seagrasses through both (1) the light climate and (2) changes in substrate physico-chemistry. We tested these hypotheses in Pāuatahanui Inlet, New Zealand, by comparing seagrass presence, abundance, and health, together with light climate and substrate physico-chemistry at contrasting habitats where (1) seagrass used to thrive but no longer grows (historical seagrass), (2) seagrass s

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41

Watson, RA, RG Coles, and WJ Lee Long. "Simulation estimates of annual yield and landed value for commercial penaeid prawns from a tropical seagrass habitat, Northern Queensland, Australia." Marine and Freshwater Research 44, no. 1 (1993): 211. http://dx.doi.org/10.1071/mf9930211.

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Abstract (sommario):

Concern over the loss of seagrass habitat has prompted examination of the value of the production of commercial prawns from such habitat. Cairns Harbour in tropical northern Queensland has 876 ha of mixed seagrasses, dominated by Zostera capricorni and Halodule pinifolia, that support a multispecies commercial penaeid prawn fishery offshore. Densities of juvenile commercial prawns estimated from seagrass surveys were used to project estimates of annual yield and landed value, using a deterministic simulation model employing lunar-period time steps. Estimates of the potential total annual yield

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42

Akbar, Nebuchadnezzar, Arfa Buamona, Irmalita Tahir, Abdurrachman Baksir, Rustam Effendi, and Firdaut Ismail. "Epiphytic Community Base Depth of the Sea on Seagrass Leaves in Maitara Island, North Maluku Province." JURNAL SUMBERDAYA AKUATIK INDOPASIFIK 4, no. 1 (2020): 33. http://dx.doi.org/10.46252/jsai-fpik-unipa.2020.vol.4.no.1.81.

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Abstract (sommario):

Seagrasses are habitat of various types of sea animals, including association epiphytic in rhizoma, leave and steam. Research about community structure microepiphytic based on depth and ecology index, important as community conditions information. The goal research for ecology index analysis microepiphytic based on depth sea and seagrasses community condition. Sample collections epiphytic on seagrass leave used 1x1 meters quadrant based on depth. Epiphytic sample cutted and scraped in leave surface, than into to bottles sample contain 70% alcohol. The research method used line trasect 50 meter

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43

Menez, Ernani G., and Ronald C. Phillips. "Seagrasses." Smithsonian Contributions to the Marine Sciences, no. 34 (1988): 1–104. http://dx.doi.org/10.5479/si.01960768.34.

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44

Ramesh, Chatragadda, and Raju Mohanraju. "Seagrass Ecosystems of Andaman and Nicobar Islands: Status and Future Perspective." Environmental and Earth Sciences Research Journal 7, no. 4 (2020): 169–74. http://dx.doi.org/10.18280/eesrj.070407.

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Abstract (sommario):

Seagrasses are unique marine flowering plants that play an important ecological role by yielding primary production and carbon sequestration to the marine environment. Seagrass ecosystems are rich in organic matter, supporting the growth of bio-medically important epi and endophytic microorganisms and harbor rich marine biodiversity. They are an essential food source for endangered Andaman state animal Dugongs. Seagrasses are very sensitive to water quality changes, and therefore they serve as ecological bio-indicators for environmental changes. The benthic components in and around the seagras

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45

Mascarinas, Honey Jane, and Otadoy Julie B. "Seagrass Diversity and Distribution in Maribojoc Bay, Bohol, Philippines." American Journal of Environment and Climate 1, no. 1 (2022): 12–19. http://dx.doi.org/10.54536/ajec.v1i1.217.

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Abstract (sommario):

Seagrasses are major parts of coastal and marine biodiversity. Unfortunately, these aquatic plants and their ecological values are virtually unknown to many Filipinos. This study assessed the seagrasses in Maribojoc Bay, particularly in the coastal areas of the three municipalities, namely Maribojoc, Dauis, Panglao, and the City of Tagbilaran. Ecological assessments were conducted to determine the composition, abundance, distribution, percent cover, diversity, dominance, and evenness of seagrass species. Eight sampling sites were surveyed from October to December 2020. Seven seagrass species w

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46

Rein, Thu. "Seagrass surveys in Shwe Thaung Yan coastal areas, the southern part of Rakhine Coastal Region, Myanmar: biodiversity, coverage and biomass." Journal of Aquaculture & Marine Biology 8, no. 3 (2019): 105–12. http://dx.doi.org/10.15406/jamb.2019.08.00248.

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Abstract (sommario):

Studies on percent cover and biomass of seagrasses from Shwe Thaung Yan coastal areas (Inn Din Gyi, Kyauk Nagar and Phoe Htaung Gyaing), the Southern parts of Rakhine Coastal Region, were carried out between March and August, 2018. A total of 8 species of seagrasses, namely Syringodiumisoetifolium (Ascherson) Danty, Halodulepinifolia (Miki) den Hartog, Haloduleuninervis (Forsskal) Ascherson, Cymodocearotundata Ehrenberg et Hemprich ex Ascherson, C. serrulata (R. Brown) Ascherson et Magnus, Thalassiahemprichii(Ehrenberg) Ascherson, Halophila major (Zoll.) Miquel and Enhalusacoroides (Linnaeus f

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47

Asri, Sri Dianing. "Underwater Image Segmentation with the GMM (Gaussian Mixture Model) Algorithm." JSAI (Journal Scientific and Applied Informatics) 7, no. 2 (2024): 253–57. http://dx.doi.org/10.36085/jsai.v7i2.6418.

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Abstract (sommario):

The purpose of this study was to measure the performance of Gaussian Mixture Model (GMM) technique for underwater image segmentation of seagrass objects based on datasets from autonomous surface vehicles (ASV from the Faculty of Fisheries and Marine Sciences, Bogor Agricultural University. The dataset is 640 x 480 pixel image data to support image segmentation research. There are three categories of underwater imagery: (a) underwater imagery featuring seagrass and seawater backgrounds; (b) underwater imagery featuring seagrasses, clear fish, and seawater backgrounds; and (c) underwater imagery

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48

Irawan, Andri, and Noorsalam R. Nganro. "DISTRIBUTION OF SEAGRASSES IN INNER AMBON BAY." Jurnal Ilmu dan Teknologi Kelautan Tropis 8, no. 1 (2016): 99–114. http://dx.doi.org/10.29244/jitkt.v8i1.12499.

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Abstract (sommario):

ABSTRACTExcessive sedimentation in Inner Ambon Bay (IAB) is alleged to cause the degradation of seagrass ve-getation in the area. To get a clearer picture about the matter, we conducted a field study in October 2010 - January 2011 to describe the distribution and density of seagrass at several locations in IAB with different conditions of sedimentation levels. Data were collected using transects perpendicular to the coastline along the seagrass vegetation. The results showed that there were six species of seagrass which were spreaded unevenly. At the locations with high sedimentation, we found

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49

Thorhaug, Anitra, and Jeffry Marcus. "EFFECTS OF DISPERSANT AND OIL ON SUBTROPICAL AND TROPICAL SEAGRASSES." International Oil Spill Conference Proceedings 1985, no. 1 (1985): 497–501. http://dx.doi.org/10.7901/2169-3358-1985-1-497.

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Abstract (sommario):

ABSTRACT Preliminary experiments, using the subtropical/tropical coastal and estuarine seagrasses Thalassia testudinum, Halodule wrightii, and Syringodium filiforme, were carried out to examine the effects of dispersants. Experiments exposed seagrasses in vitro to concentrations of Louisiana crude oil ranging from 7.5 to 500 milliliters (mL) in 105 mL seawater at exposure times of 5 to 100 hours (seagrass not in contact with oil slick). In other experiments, the seagrasses were exposed to the dispersant Corexit 9527, which was combined with the oil in a ratio of 1 part dispersant to 10 parts o

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50

Ghandourah, Mohamed, Usama W. Hawas, Lamia T. Abou El-Kassem, Munir Bamkhrama, and Hanan A. A. Taie. "Antioxidant and Antitumor Metabolites of Saudi Red Sea Seagrasses Halodule uninervis and Thalassia hemprichii." Letters in Organic Chemistry 16, no. 1 (2018): 50–58. http://dx.doi.org/10.2174/1570178615666180525110832.

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Abstract (sommario):

The present study aimed to investigate the chemical constituents, and antioxidants and antitumor activities of the seagrasses Halodule uninervis and Thalassia hemprichii. Seventeen compounds were isolated from both seagrasses, and identified as flavonoids, phenolic acids, nitrogen compound, steroids and fatty acids. Their structures were established by spectral analysis (UV, MS, and 1D- and 2D-NMR) and chemical investigation (for glycosides). The total metabolites of each seagrass and the isolated flavonoids tested in different in vitro assays (DPPH, ABTS, FRAP, Fe2+ chelating, reducing power,

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