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Littérature scientifique sur le sujet « Seagrasse »

Auteur : Grafiati
Publié le 1 avril 2023

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Articles de revues sur le sujet "Seagrasse"

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ERNAWATI, Ni Made, et Made Ayu Pratiwi. « STRUKTUR KOMUNITAS EKOSISEM PADANG LAMUN PADA DAERAH INTERTIDAL DI PANTAI SANUR, BALI ». ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) 12, no 1 (31 mai 2018) : 50. http://dx.doi.org/10.24843/ejes.2018.v12.i01.p07.

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Coastal ecosystem is a productive ecosystem and has high ecological and economic value. Coastal ecosystem components, consist of coral reefs, seagrass beds, mangroves and various types of biota. The seagrass ecosystem is one of the most unique coastal ecosystems because the seagrass can live well in high salinity conditions. Seagrass ecosystem in Bali Island has many adventages and widely used for marine tourism activities. One of the marine tourism sites, that take advantage of the beauty of the seagrass ecosystem in Bali is Sanur beach. The utilization of seagrass ecosystem for marine tourism activities might be influence the structure of seagrass community. Therefore, the study about Community Structure of Seagrass Ecosystem at Intertidal Area in Sanur Beach is very important to carried out in order to investigate the structure of the seagrass ecosystem community. Samples were taken in the intertidal zone at six observation stations. At each station, it was conducted three times perpendicular repetition to the shoreline. Seagrass observation was done by using quadratic transect (50 × 50 cm). The types of seagrass found in Sanur Beach were 6 species, namely Cymodocea serrulata, Cymodocea rotundata, Halophila ovalis, Halodule uninervis, Halodule pinifolia, and Syringodium isoetifolium. Cymodocea serrulata is a seagrass-type found in every observation station, and it able to live well in Sanur Beach water characteristics. The highest average of seagrass species density is shown by the Cymodocea serrulata species of 175.11 stands/m2, while, the highest average of seagrass species density is shown by the Halodule pinifolia species of 27.33 stands/m2. The average of diversity, uniformity and dominance index at Sanur Beach reach 0.8682; 0.7347; and 0.4987, respectively. In Sanur Beach area, the seagrass has high uniformity value and stable community. The instability community has been found at station 2 when the dominance of Cymodocea serrulata species was occurred. Keywords: Community structure; Sanur Beach; seagrasse cosystem
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Batuwael, Anggi Wawan, et 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 (22 mai 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: The study found a class of gastropods, 10 species namely Strombus variabilis, Strombus microurceus, Nassariusl uridus, Nassarius dorsatus, Strombus urceus, Cypraea annulus, Strombus labiatus, Strombus marginatus, Neritas quamulata, Cypraeratigris. Of the seagrass plants found 4 species, namely Enhalus acoroides, Thalassia hemprichii, Halophila ovalis, Cymodocea rotundata. Association values ​​ranged from 4.159-8.85 with positive and negative types. This means that both types of seagrass are often found together or not found together in each observation box. Conclusion: There is a weak association between seagrass and gastropods in the coastal waters of Tiouw State. The association of gastropod types with seagrass species is found in 10 types of gastropods and 4 types of seagrasses in the waters of the Tiouw State coast
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Short, Frederick T., et Sandy Wyllie-Echeverria. « Natural and human-induced disturbance of seagrasses ». Environmental Conservation 23, no 1 (mars 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 nutrient filtration, sediment stabilization, and breeding and nursery areas for finfish and shellfish.We define disturbance, natural or human-induced, as any event that measurably alters resources available to seagrasses so that a plant response is induced that results in degradation or loss. Applying this definition, we find a common thread in many seemingly unrelated seagrass investigations. We review reports of seagrass loss from both published and ‘grey’ literature and evaluate the types of disturbances that have caused seagrass decline and disappearance. Almost certainly more seagrass has been lost globally than has been documented or even observed, but the lack of comprehensive monitoring and seagrass. mapping makes an assessment of true loss of this resource impossible to determine.Natural disturbances that are most commonly responsible for seagrass loss include hurricanes, earthquakes, disease, and grazing by herbivores. Human activities most affecting seagrasses are those which alter water quality or clarity: nutrient and sediment loading from runoff and sewage disposal, dredging and filling, pollution, upland development, and certain fishing practices. Seagrasses depend on an adequate degree of water clarity to sustain productivity in their submerged environment. Although natural events have been responsible for both large-scale and local losses of seagrass habitat, our evaluation suggests that human population expansion is now the most serious cause of seagrass habitat loss, and specifically that increasing anthropogenic inputs to the coastal oceans are primarily responsible for the world-wide decline in seagrasses.
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Ierodiaconou, Daniel A., et 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 (Martens ex Aschers), Zostera muelleri (Irmisch ex Aschers) and Ruppia megacarpa (Mason), were identified in the Hopkins Estuary. All beds investigated contained a mixed species relationship. Three harvest techniques were trialed in a pilot study, with the 25 × 25-cm quadrat statistically most appropriate. Biomass of seagrasses and epiphytes was found to vary significantly with depth, but not between sites. The average estimate of biomass for total seagrasses and their epiphytes in the estuary in January 2000 was 222.7 g m–2 (dry weight). Of the total biomass, 50.6% or 112.7 g m–2 (dry weight) was contributed by seagrasses and 49.4% of the biomass (110.0 g m–2) were epiphytes. Of the 50.6% of the total biomass represented by seagrasses, 39.3% (87.5 g m–2) were leaves and 11.3% (25.2 g m–2) were rhizomes. The total area of seagrasses present in the Hopkins Estuary was estimated to be 0.4 ± 0.005 km2, with the total area of the estuary estimated to be 1.6 ± 0.02 km2 (25% cover). The total standing crop of seagrasses and epiphytes in the Hopkins Estuary in January 2000 was estimated to be 102.3 ± 57 t in dry weight, 56% (56.9 ± 17 t, dry weight) seagrasses and 44% (45.4 ± 19 t, dry weight) epiphytes. Of the seagrass biomass, 39% (39.7 ± 13 t, dry weight) was contributed by leaves and 17% (17.3 ± 7 t, dry weight) by rhizomes.
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J. Lee Long, W., R. G. Coles et 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 Chelonia mydas and commercially valuable prawn fisheries, will continue to strongly influence directions in seagrass research and conservation management in Queensland. Widespread loss of seagrasses following natural cyclone and flood events in some locations has had serious consequences to regional populations of Dugong. However, the impacts to Queensland fisheries are little studied. Agricultural land use practices may exacerbate the effects of natural catastrophic events, but the long-term impacts of nutrients, pesticides and sediment loads on Queensland seagrasses are also unknown. Most areas studied are nutrient limited and human impacts on seagrasses in Queensland are low to moderate, and could include increases in habitat since modern settlement. Most impacts are in southern, populated localities where shelter and water conditions ideal for productive seagrass habitat are often targets for port development, and are at the downstream end of heavily modified catchments. For Queensland to avoid losses experienced by other states, incremental increases in impacts associated with population and development pressure must be managed. Seagrass areas receive priority consideration in oil spill management within the Great Barrier Reef and coastal ports. Present fisheries legislation for marine plant protection, marine parks and area closures to trawl fishing help protect inshore seagrass prawn nursery and Dugong feeding habitat, but seagrasses in deep water do not yet receive any special zoning protection. Efficacy of the various Local, State and Commonwealth Acts and planning programmes for seagrass conservation is limited by the expanse and remoteness of Queensland's northern coast, but is improving through broad-based education programmes. Institutional support is sought to enable community groups to augment limited research and monitoring programmes with local "habitat watch" programmes. Research is helping to describe the responses of seagrass to natural and human impacts and to determine acceptable levels of changes in seagrass meadows and water quality conditions that may cause those changes. The management of loss and regeneration of sea grass is benefiting from new information collected on life histories and mechanisms of natural recovery in Queensland species. Maintenance of Queensland's seagrasses systems will depend on improved community awareness, regional and long-term planning and active changes in coastal land use to contain overall downstream impacts and stresses.
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Omollo, Derrick, Virginia Wang’ondu, Michael Githaiga, Daniel Gorman et James Kairo. « The Contribution of Subtidal Seagrass Meadows to the Total Carbon Stocks of Gazi Bay, Kenya ». Diversity 14, no 8 (11 août 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 are less understood, especially regarding their contribution to the carbon dynamics. This is particularly true in regions with less attention and limited resources. Paucity of information is even more relevant for the subtidal meadows that are less accessible. In Kenya, much of the available information on seagrasses comes from Gazi Bay, where the focus has been on the extensive intertidal meadows. As is the case with other regions, there remains a paucity of information on subtidal meadows. This limits our understanding of the overall contribution of seagrasses in carbon capture and storage. This study provides the first assessment of the species composition and variation in carbon storage capacity of subtidal seagrass meadows within Gazi Bay. Nine seagrass species, comprising of Cymodocea rotundata, Cymodocea serrulata, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Halophila stipulacea, Syringodium isoetifolium, Thalassia hemprichii, and Thalassodendron ciliatum, were found. Organic carbon stocks varied between species and pools, with the mean below ground vegetation carbon (bgc) stocks (5.1 ± 0.7 Mg Cha−1) being more than three times greater than above ground carbon (agc) stocks (0.5 ± 0.1 Mg Cha−1). Mean sediment organic carbon stock (sed Corg) of the subtidal seagrass beds was 113 ± 8 Mg Cha−1. Combining this new knowledge with existing data from the intertidal and mangrove fringed areas, we estimate the total seagrass ecosystem organic carbon stocks in the bay to be 196,721 Mg C, with the intertidal seagrasses storing about 119,790 Mg C (61%), followed by the subtidal seagrasses 55,742 Mg C (28%) and seagrasses in the mangrove fringed creeks storing 21,189 Mg C (11%). These findings are important in highlighting the need to protect subtidal seagrass meadows and for building a national and global data base on seagrass contribution to global carbon dynamics.
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Ahmad-Kamil, E. I., R. Ramli, S. A. Jaaman, J. Bali et 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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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 established within the study area from June 2009 to May 2010. Meteorological data such as total rainfall, air temperature, and Southern Oscillation Index were also investigated. Our results showed that (i) the monthly changes of seagrass percentage cover are significant, (ii) the changes correlated significantly with turbidity measurements, and (iii) weather changes affected the seagrass populations. Our study indicates seagrass percentage increased during the El-Nino period. These results suggest that natural disturbances such as weather changes affect seagrass populations. Evaluation of land usage and measurements of other water physicochemical parameters (such as heavy metal, pesticides, and nutrients) should be considered to assess the health of seagrass ecosystem at the study area.
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Burkholder, Derek A., Michael R. Heithaus et 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 we did not detect variation in gazing intensity among habitats. In general, grazers were more likely to consume fast-growing species with lower carbon : nitrogen (C : N) and carbon : phosphorus (C : P) ratios, than the slower-growing species that are dominant in the bay. Grazer choices were not, however, correlated with nutrient content within the tropical seagrasses. Slow-growing temperate seagrasses that experienced lower herbivory provide greater habitat value as a refuge for fishes and may facilitate fish grazing on tropical species. Further studies are needed, however, to more fully resolve the factors influencing grazer foraging preferences and the possibility that grazers mediate indirect interactions among seagrass species.
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Wardono, Suko, Elland Yupa Sobhytta, I. Gusti Ngurah Agung Dhananjaya, Rodo Lasniroha, Yuniarti Karina Pumpun, Mochammad Miftakhul Mashuda, Dewa Gde Tri Bodhi Saputra et Permana Yudiarso. « Association Analysis of Seagrass Coverage and Human Activities in Nusa Lembongan ». Jurnal Biodjati 7, no 2 (30 novembre 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 Indonesia, namely Enhalus acoroides, Thalassia hemprichii, Cymodocea serrulata, Cymodocea rotundata, Halodule pinifolia, and Halophila ovalis. From the two stations (LMB01 and LMB02), the total seagrass coverage was 38.10±30.98% or the medium category. The seagrass communities in the station areas were generally formed by 3 types of seagrasses; Thalassia hemprichii, Cymodocea serrulata, and Cymodocea rotundata. LMB02 has higher seagrass coverage than LMB01. The seagrass coverage is inversely proportional to the intensity of human activity.
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Zabarte-Maeztu, Iñigo, Fleur E. Matheson, Merilyn Manley-Harris, Robert J. Davies-Colley, Megan Oliver et 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 (21 août 2020) : 645. http://dx.doi.org/10.3390/jmse8090645.

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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 still persists (existing seagrass) and (3) seagrass has been present recently, but not currently (potential seagrass). Historical seagrass substrate had significantly higher mud (35% average), bulk density (1.5 g cm−3), porewater ammonium concentration (65 µM), and a more reduced redox profile (negative redox at only 2 cm soil depth) as well as a lower light availability when submerged compared to other habitats, while total daily light exposure differed little between habitats. This suggests that failure of seagrass to recolonize historical seagrass habitat reflects substrate muddiness and consequent unfavorable rhizosphere conditions. Our results provide evidence for the multi-stressor effects of fine sediment on seagrasses, with substrate suitability for seagrass being detrimentally affected even where light exposure seems sufficient.
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Thèses sur le sujet "Seagrasse"

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Mvungi, Esther Francis. « Seagrasses and Eutrophication : Interactions between seagrass photosynthesis, epiphytes, macroalgae and mussels ». Doctoral thesis, Stockholms universitet, Botaniska institutionen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-55808.

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Seagrass meadows are highly productive, ecologically and economically valuable ecosystems. However, increased human activities along the coastal areas leading to processes such as eutrophication have resulted in the rapid loss and deterioration of seagrass ecosystems worldwide. This thesis focuses on the responses of seagrasses to increases in nutrients, subsequent increases in ephemeral algae, and changes in the physical-chemical properties of seawater induced by interaction with other marine biota. Both in situ and laboratory experiments conducted on the tropical seagrasses Cymodocea serrulata and Thalassia hemprichii revealed that increased concentrations of water column nutrients negatively affected seagrass photosynthesis by stimulating the growth of the epiphytic biomass on the seagrass leaves. Interaction between seagrasses and other marine organisms induced different responses in seagrass photosynthesis. Ulva intestinalis negatively affected the photosynthetic performance of the temperate seagrass Zostera marina both by reducing the light and by increasing the pH of the surrounding water. On the other hand, the coexistence of mussels Pinna muricata and seagrass Thalassia hemprichii enhanced the photosynthetic activity of the seagrass, but no effect on the mussels' calcification was recorded. This study demonstrates that seagrass productivity is affected by a multitude of indirect effects induced by nutrient over-enrichment, which act singly or in concert with each other. Understanding the responsive mechanisms involved is imperative to safeguard the ecosystem by providing knowledge and proposing measures to halt nutrient loading and to predict the future performance of seagrasses in response to increasing natural and human perturbations.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Papers 1, 3 and 4: Submitted. Paper 2: Manuscript.
Swedish Agency for Research Cooperation (Sida/SAREC) marine bilateral programme
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Uku, Jacqueline. « Seagrasses and their epiphytes : Characterization of abundance and productivity in tropical seagrass beds ». Doctoral thesis, Stockholm University, Department of Botany, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-527.

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Seagrass beds cover large intertidal and subtidal areas in coastal zones around the world and they are subjected to a wide variety of anthropogenic influences, such as nutrient enrichment due to sewage seepage. This study was undertaken to address specific questions focusing on whether near shore tropical seagrasses that receive a constant influx of groundwater nutrient inputs, would exhibit a higher productivity and to what extent epiphytic algae reflect the impacts of nutrient inputs. An additional aspect of study was to determine the prevalence of “acid zones” in tropical seagrasses. The productivity of the seagrasses Cymodocea rotundata, Thalassia hemprichii and Thalassodendron ciliatum was compared in two sites along the Kenyan coast; Nyali (a high nutrient site) and Vipingo (a low nutrient site). Of the three seagrasses T. hemprichii showed the most distinct differences with higher growth and biomass in the nutrient rich site whereas the growth of C. rotundata was similar in the two sites. A high epiphytic cover was found on the shoots of T. ciliatum found in the high nutrient site Nyali.

Morphological and genetic characterization of bacterial and cyanobacterial epiphytes showed specific associations of nitrogen fixing cyanobacteria on the seagrass C. rotundata in the low nutrient site (Vipingo). At this site, shoots of C. rotundata had a higher C:N ratio compared to shoots in the high nutrient site (Nyali) indicating that the association with nitrogen fixing cyanobacteria is a strategy, for this species, to meet its nutrient needs. Bacterial epiphytes belonging to the group Cytophaga-Flavobacteria-Bacteroides (CFB) were found on T. ciliatum and T. hemprichii from the two sites. CFB bacteria are characteristic of waste water, particularly from livestock farming areas, thereby confirming seepage of groundwater from surrounding catchment areas. These prokaryotic associations were specific for the different seagrasses and it appears that the establishment of epiphytic associations may not be a random encounter but a specific association that meets specific needs.

The seagrass T. ciliatum in the high nutrient site had an abundance of macroalgal epiphytes and the impact of the epiphytic coverage was assessed using Pulse Amplitude Modulated (PAM) fluorometry. The photosynthetic activity of seagrass parts that were covered by epiphytes was suppressed but the productivity of the whole shoot was not significantly reduced. In the nutrient rich site, epiphytes were found to contribute up to 45% of the total estimated gross productivity, during the SE monsoon season, while epiphytic contribution in the nutrient poor site, was 8%. Epiphytic abundance and contribution to productivity decreased during the NE monsoon. The photosynthetic activity of T. ciliatum shoots was similar in the two study sites with shoots in the nutrient rich site growing faster. T. ciliatum, in the low nutrient site, invested in the development of below ground root tissue which may indicate the development of a strategy to gain access to pore water nutrient pools.

Carbon uptake strategies of eight tropical seagrasses were re-evaluated to determine how common the “acid zone” mechanism is among tropical seagrasses. Six of the eight species studied showed photosynthetic inorganic carbon (Ci) acquisition based on carbonic anhydrase catalysed HCO3- to CO2 conversions within an acidified diffusion boundary layer (“acid zone”). Cymodocea serrulata appeared to maintain its carbon uptake by extracellular carbonic anhydrase catalysed CO2 formation from HCO3- without the need for acidic zones, whereas, Halophila ovalis appeared to have a system in which H+ extrusion may be followed by HCO3--H+ co-transport into the cells. These findings indicate that competition for carbon, between the host seagrass species and epiphytes, could determine seagrass-epiphyte associations.

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Uku, Jacqueline Nduku. « Seagrasses and their epiphytes : characterization of abundance and productivity in tropical seagrass beds / ». Stockholm : Dept. of Botany, Stockholm university, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-527.

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Wicks, Elinor Caroline. « The effect of sea level rise on seagrasses is sediment adjacent to retreating marshes suitable for seagrass growth ? / ». College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/3277.

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Thesis (M.S.) -- University of Maryland, College Park, 2005.
Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Horn, Lotte E. « The measurement of seagrass photosynthesis using pulse amplitude modulated (PAM) fluorometry and its practical applications, specifically in regard to transplantation / ». Access via Murdoch University Digital Theses Project, 2006. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20061123.150231.

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Moore, Althea F. P. « The Effects of Seagrass Species and Trophic Interactions in Experimental Seagrass Communities ». W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539617911.

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Kilminster, Kieryn Lee. « Biogeochemical constraints on the growth and nutrition of the seagrass Halophila ovalis in the Swan River Estuary ». University of Western Australia. School of Plant Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0016.

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[Truncated abstract] Biogeochemical processes in seagrass sediments influence growth and nutrition of seagrasses. This thesis investigates the below-ground interactions between biotic and abiotic factors that influence seagrass nutrition and growth, with focus on a small species of seagrass, Halophila ovalis (R. Br.) Hook ƒ., from the Swan River Estuary, Western Australia. Seagrass showed significantly lower growth and an increase in leaf nitrogen and phosphorus concentrations with increased organic matter loading. With maximal light reduction, lower growth rates and average leaf weights were observed, and leaf nitrogen and phosphorus concentrations were higher. Light reduction was also shown to increase bioavailability of inorganic nutrients within porewater of seagrass sediment . . . Sulphide was hypothesised to have an inhibitory effect on nutrient uptake of Halophila ovalis. Below-ground sulphide inhibits the photosynthetic efficiency of photosystem II at sulphide concentrations greater than 1 mM. Sulphide exposure enhanced phosphate uptake, with no significant effect on ammonium uptake of H. ovalis. This thesis demonstrates that biogeochemical processes both constrain the potential growth of seagrasses and influence the nutrient status of seagrass tissue. Consideration of the influence of sulphide stress on seagrasses is likely to be particularly important for anthropogenically influenced aquatic systems, where inputs of organic matter are enriched relative to pristine ecosystems. A better understanding of biogeochemical processes will allow researchers to predict how future changes in sediment chemistry will influence seagrass meadows.
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McMahon, Kathryn. « Recovery of subtropical seagrasses from natural disturbances / ». [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19102.pdf.

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Tadkaew, Nichanan. « Monitoring of seagrasses in Lake Illawarra, NSW ». Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070821.142240/index.html.

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Paxson, Jill C. « Branching frequency of Thalassia testudinum (Banks ex König) as an ecological indicator in Florida Bay / ». Electronic version (PDF), 2003. http://dl.uncw.edu/etd/2003/paxsonj/jillpaxson.pdf.

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Livres sur le sujet "Seagrasse"

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Phillips, Ronald C. Seagrasses. Washington, D.C : Smithsonian Institution Press, 1988.

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Hemminga, Marten. Seagrass ecology. Cambridge, UK : Cambridge University Press, 2000.

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Larkum, Anthony W. D., Gary A. Kendrick et Peter J. Ralph, dir. Seagrasses of Australia. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71354-0.

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Seagrapes. Manassas, VA : E.M. Press, 1996.

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C, Phillips Ronald, et McRoy C. Peter 1941-, dir. Seagrass research methods. Paris : Unesco, 1990.

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Miththapala, Sriyanie. Seagrasses and sand dunes. Colombo, Sri Lanka : Ecosystems and Livelihoods Group Asia, IUCN, 2008.

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1965-, Green Edmund P., et Short Frederick T, dir. World atlas of seagrasses. Berkeley : University of California Press, 2003.

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Miththapala, Sriyanie. Seagrasses and sand dunes. Colombo, Sri Lanka : Ecosystems and Livelihoods Group Asia, IUCN, 2008.

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Green, Edmund P. World atlas of seagrasses. Berkeley, CA : University of California Press, 2004.

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K, Ramamurthy, et Botanical Survey of India, dir. Seagrasses of coromandel coast India. Coimbatore : Botanical Survey of India, 1992.

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Chapitres de livres sur le sujet "Seagrasse"

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Huntley, Brian John. « The Mangrove Biome ». Dans Ecology of Angola, 383–91. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18923-4_17.

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AbstractThe cold Benguela Current passing along Angola’s Atlantic Ocean coast accounts for its mangrove communities lying 20° latitude north of those of the Indian Ocean Coast of Africa, bathed by the warm Mozambique Current. This chapter draws on the limited literature available on Angola’s mangrove forests and seagrass meadows that constitute its Mangrove Biome. Comprising only five of the world’s 55 mangrove species, and two of the world’s 70 species of seagrasses, Angola’s mangrove communities cover a very limited area compared with other tropical countries. This is due to Angola’s steeply shelving coastline, with small lagoons and mudflats at the mouths of its rivers. However, they provide excellent opportunities for the study of the complex adaptations of plants to regular changes in water salinity and to growth in waterlogged, anoxic soil. The adaptations include stilt roots, with specialised absorptive pores, roots containing porous aerenchyma tissue for oxygen transfer, and reproductive propagules that develop into seedlings while still attached to the tree. The mudflats of coastal lagoons support two species of seagrass (highly specialised angiosperms that are permanently submerged). Seagrass meadows provide habitat for a wide diversity of marine animals, while mangrove forests shelter several crocodile and primate species.
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Short, F. T., C. A. Short et A. B. Novak. « Seagrasses ». Dans The Wetland Book, 1–19. Dordrecht : Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6173-5_262-1.

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Short, Frederick T., Cathy A. Short et Alyssa B. Novak. « Seagrasses ». Dans The Wetland Book, 73–91. Dordrecht : Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-007-4001-3_262.

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Merlin, Mark D. « Seagrasses ». Dans Encyclopedia of Modern Coral Reefs, 973–78. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2639-2_146.

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Cortés, Jorge, et Eva Salas. « Seagrasses ». Dans Marine Biodiversity of Costa Rica, Central America, 119–22. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8278-8_6.

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Pérez-Lloréns, J. Lucas, Juan J. Vergara, Irene Olivé, Jesús M. Mercado, Rafael Conde-Álvarez, Ángel Pérez-Ruzafa et Félix L. Figueroa. « Autochthonous Seagrasses ». Dans The Mediterranean Sea, 137–58. Dordrecht : Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6704-1_9.

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Alongi, Daniel M. « Seagrass Meadows ». Dans Blue Carbon, 37–51. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91698-9_4.

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Brullo, Salvatore, Cristian Brullo, Salvatore Cambria et Gianpietro Giusso del Galdo. « Seagrass Vegetation ». Dans Geobotany Studies, 121–23. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34525-9_11.

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Glaeser, Georg, et Daniel Abed-Navandi. « Habitat : Seagrass ». Dans Ecosystems of the Mediterranean Sea, 142–53. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22334-1_6.

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Larkum, Anthony W. D., Michelle Waycott et John G. Conran. « Evolution and Biogeography of Seagrasses ». Dans Seagrasses of Australia, 3–29. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71354-0_1.

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Actes de conférences sur le sujet "Seagrasse"

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Tongnunui, Prasert, Prasert Tongnunui, Woraporn Tarangkoon, Woraporn Tarangkoon, Parichat Hukiew, Parichat Hukiew, Patcharee Kaeoprakan et al. « SEAGRASS RESTORATION : AN UPDATE FROM TRANG PROVINCE, SOUTHWESTERN THAILAND ». Dans Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9447ad58f1.23030316.

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Natural disasters may adversely affect coastal resources potentially leading to coastal habitat restorations that incorporate stakeholders and the general public. Appropriate methodologies for habitat restoration are developed to ensure the outcomes of this project. Currently, seagrass bed restoration by means of asexual and sexual propagation techniques have been used worldwide. However, the experience of seagrass (Enhalus acoroides) habitat restoration in Trang Province noted that to accomplish this project’s strategies involved the application of restoration techniques along with public and stakeholder participation. The application of asexual propagation, specifically the collection of single shoots from donor seagrasses and subsequent transplantation, is a convenient tool. However, from this project results, this process still has conceptual problems as from the large numbers of single shoots collected from donor seagrasses, the survival rate was relatively low. Furthermore, this process was complicated by conflicting interests between local communities near to the donor site and the project’s organizers. In order to reduce said conflicts, other techniques to balance stakeholder interests were instigated by this project, namely the development of both asexual and sexual propagation techniques. This project initiated a sexual propagation technique by the collection of wild seeds of Enhalus acoroides that were subsequently grown in the laboratory before natural habitat transplantation. This project results showed that seeds can be grown rapidly and can be cultured in large numbers. However, this development technique has a limit on rearing time because seedlings were found to be in decline after the third month of the experiment. These problems were compounded by a limiting factor that pushed the project’s organizers to decide to transplant seagrasses from the laboratory to the wild whether a time was seasonally suitable or unsuitable, the planting activity still done forward. This matter may have enhanced the low survival rate situation after seagrass transplantation to the wild. If there is a need to recover a seagrass bed, the above culture and transplantation methodologies should be used in conjunction with repeated periodic plantings until natural ecological function has been restored. In conclusion, further research should be instigated to improve the cultivation method for producing ready to plant seedlings and to improve methods of project operation.
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Tongnunui, Prasert, Prasert Tongnunui, Woraporn Tarangkoon, Woraporn Tarangkoon, Parichat Hukiew, Parichat Hukiew, Patcharee Kaeoprakan et al. « SEAGRASS RESTORATION : AN UPDATE FROM TRANG PROVINCE, SOUTHWESTERN THAILAND ». Dans Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b431687e149.

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Natural disasters may adversely affect coastal resources potentially leading to coastal habitat restorations that incorporate stakeholders and the general public. Appropriate methodologies for habitat restoration are developed to ensure the outcomes of this project. Currently, seagrass bed restoration by means of asexual and sexual propagation techniques have been used worldwide. However, the experience of seagrass (Enhalus acoroides) habitat restoration in Trang Province noted that to accomplish this project’s strategies involved the application of restoration techniques along with public and stakeholder participation. The application of asexual propagation, specifically the collection of single shoots from donor seagrasses and subsequent transplantation, is a convenient tool. However, from this project results, this process still has conceptual problems as from the large numbers of single shoots collected from donor seagrasses, the survival rate was relatively low. Furthermore, this process was complicated by conflicting interests between local communities near to the donor site and the project’s organizers. In order to reduce said conflicts, other techniques to balance stakeholder interests were instigated by this project, namely the development of both asexual and sexual propagation techniques. This project initiated a sexual propagation technique by the collection of wild seeds of Enhalus acoroides that were subsequently grown in the laboratory before natural habitat transplantation. This project results showed that seeds can be grown rapidly and can be cultured in large numbers. However, this development technique has a limit on rearing time because seedlings were found to be in decline after the third month of the experiment. These problems were compounded by a limiting factor that pushed the project’s organizers to decide to transplant seagrasses from the laboratory to the wild whether a time was seasonally suitable or unsuitable, the planting activity still done forward. This matter may have enhanced the low survival rate situation after seagrass transplantation to the wild. If there is a need to recover a seagrass bed, the above culture and transplantation methodologies should be used in conjunction with repeated periodic plantings until natural ecological function has been restored. In conclusion, further research should be instigated to improve the cultivation method for producing ready to plant seedlings and to improve methods of project operation.
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Rahmawati, Susi, Udhi Eko Hernawan et Agustin Rustam. « The seagrass carbon content of 0.336 of dry weight can be applied in Indonesian seagrasses ». Dans INTERNATIONAL CONFERENCE ON BIOLOGY AND APPLIED SCIENCE (ICOBAS). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5115616.

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Abdelbary, Ekhlas M. M., et Aisha AlAshwal. « A comparative study of Seagrasses Species in Regional Seas and QMZ ». Dans Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0039.

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Seagrasses are flowering monocot green plants that have adapted to marine life, and remain completely immersed in seawater and are primary producers of food for numerous marine animals. Seagrasses are of worldwide distribution and it was earlier estimated that there are approximately 60-72 known species of seagrasses. It is now evident that the number of seagrasses species is almost 200, comprising 25 genera and 5 families, namely Cymodoceaceae, Hydrocharitaceae, Posidoniaceae, Zosteraceae and Ruppiaceae, covering a global area of 300,000-600,000 km2. It is also estimated that they have declined in area by 29%. The Western Indo-Pacific realm encompasses 13 species in two families; the Cymodoceacae with 4 genera and the Hydrocharitaceae with 3 genera. Twelve species extend into the Red Sea, 4 occur in the Arabian/Persian Gulf and 4 in the Arabian Sea. The total area of Qatar marine zone (EEZ) is approximately 35,000km2 and three species of seagrasses are known to occur in this zone. These are Halophila stipulacea, Halophila ovalis and Halodule uninervisis, the most common one. It is established that seagrasses consolidate and stabilize bottom sediments, create and maintain good water quality (clarity), produce oxygen, provide food, nursery ground for many animals and have been proven to be very important in GHG emissions.
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Al-qahtani, Noora Saad, et Talaat Ahmed. « Effect of Seagrass Liquid Extracts on Bell Pepper (Capsicum annuum) Under Salt stress Conditions ». Dans Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0104.

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Salinity is considered as major environmental challenge that affects crop growth and productivity. This study investigated the application of Haodule univervis seagrass liquid extract on bell pepper (Capsicum annuum L.) under salt stress conditions. The salinity treatments were applied by irrigating bell pepper plants with 0, 50, 100, 150, and 200 mM/l of NaCl with four replications. The bell pepper plants were divided into two groups: one group was sprayed with seagrass extract, and the other group was sprayed with distilled water. The salt treatment was applied at every 10 days interval for only three treatments, and the bell pepper leaves were sprayed about seven days after the salt treatment. The results showed an increase in relative water content (RWC) of salt stressed bell pepper plants sprayed with seagrass extract from 0- 100 mM of NaCl treatment, while RWC decreased at 150 and 200 mM NaCl treatments compared to the control. This indicates stressed bell pepper plants sprayed with seagrass extract had higher RWC than plants sprayed with water at 0-100 mM NaCl treatments. Chlorophyll concentration was decreased dramatically in plants sprayed with water at 50mM of NaCl level. However, chlorophyll concentration increased slightly in plants sprayed with water at 100 mM NaCl level then start declined gradually at 150 mM and 200mM NaCl level. The plants sprayed with seagrass extract showed an increase in chlorophyll concentration at 100 and 150 mM NaCl treatment compared to the control. Fresh weights of plants sprayed with seagrass extract were declined at 50-150 mM NaCl compared to the control. However, the highest dry weights of plants sprayed with seagrass at 100 mM NaCl treatment. In addition, plants sprayed with water did not show variations in fresh and dry weights.
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Asahi, Toshimasa, Toshimasa Asahi, Kazuhiko Ichimi, Kazuhiko Ichimi, Kuninao Tada et Kuninao Tada. « NUTRIENT DYNAMICS IN EELGRASS (ZOSTERA MARINA) MEADOW AND THE VARIATION OF NUTRIENT CONTENTS OF EELGRASS ». Dans Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b938251aa95.85691438.

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Nutrient dynamics in seagrass beds and nutrient demands of seagrass biomass are not clear, although nutrient uptake of seagrass has been experimentally studied in the laboratory. We conducted the field observations and the bottom sediment core incubations to estimate nutrient fluxes in the seagrass, Zostera marina meadow. DIN (nitrate, nitrite and ammonium) concentrations were always low particularly during the Z. marina growing season (from spring to summer), and water exchanges caused by tidal currents hardly supplied nutrient demand for Z. marina. Sediment pore water also supplied insufficient nutrients to Z. marina, because pore water had less volume than the water column, although DIN concentrations of pore water were 10-100 fold higher than those of the water column. Nutrient flux from sediment to water column estimated by the sediment core incubation experiments showed a similar rate with tidal water exchange. Thus, our results suggested that Z. marina adapted for low nutrient concentrations and each nutrient source in the Z. marina meadow slightly contributed but could not support Z. marina growth. We found that another nutrient source, for example, precipitation, supplied high DIN to the Z. marina meadow. After rainfall, the DIN concentration of seawater in the Z. marina meadow increased 2-5 times higher. Moreover, nitrogen content of eelgrass also increased 2-3 times higher during several days. Those results suggested that Z. marina was usually exposed to a low nutrient concentration but could uptake abundant nutrients from temporary nutrient supplies such as precipitation.
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Asahi, Toshimasa, Toshimasa Asahi, Kazuhiko Ichimi, Kazuhiko Ichimi, Kuninao Tada et Kuninao Tada. « NUTRIENT DYNAMICS IN EELGRASS (ZOSTERA MARINA) MEADOW AND THE VARIATION OF NUTRIENT CONTENTS OF EELGRASS ». Dans Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4316623b72.

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Nutrient dynamics in seagrass beds and nutrient demands of seagrass biomass are not clear, although nutrient uptake of seagrass has been experimentally studied in the laboratory. We conducted the field observations and the bottom sediment core incubations to estimate nutrient fluxes in the seagrass, Zostera marina meadow. DIN (nitrate, nitrite and ammonium) concentrations were always low particularly during the Z. marina growing season (from spring to summer), and water exchanges caused by tidal currents hardly supplied nutrient demand for Z. marina. Sediment pore water also supplied insufficient nutrients to Z. marina, because pore water had less volume than the water column, although DIN concentrations of pore water were 10-100 fold higher than those of the water column. Nutrient flux from sediment to water column estimated by the sediment core incubation experiments showed a similar rate with tidal water exchange. Thus, our results suggested that Z. marina adapted for low nutrient concentrations and each nutrient source in the Z. marina meadow slightly contributed but could not support Z. marina growth. We found that another nutrient source, for example, precipitation, supplied high DIN to the Z. marina meadow. After rainfall, the DIN concentration of seawater in the Z. marina meadow increased 2-5 times higher. Moreover, nitrogen content of eelgrass also increased 2-3 times higher during several days. Those results suggested that Z. marina was usually exposed to a low nutrient concentration but could uptake abundant nutrients from temporary nutrient supplies such as precipitation.
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Islam, Syed M. S., Syed K. Raza, Md Moniruzzamn, Naeem Janjua, Paual Lavery et Adel Al-Jumaily. « Automatic seagrass detection : A survey ». Dans 2017 International Conference on Electrical and Computing Technologies and Applications (ICECTA). IEEE, 2017. http://dx.doi.org/10.1109/icecta.2017.8252036.

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Azmi, Afiq Auji, Teruaki Yoshida, Tatsuki Toda, Othman bin Haji Ross et Zaidi Che Cob. « Comparison of zooplankton abundance and community in seagrass and non-seagrass areas of Merambong shoal ». Dans THE 2016 UKM FST POSTGRADUATE COLLOQUIUM : Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2016 Postgraduate Colloquium. Author(s), 2016. http://dx.doi.org/10.1063/1.4966840.

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Povidisa, Katrina, et Marianne Holmer. « Iron plaque formation on seagrasses : Why not ? » Dans 2008 IEEE/OES US/EU-Baltic International Symposium (BALTIC). IEEE, 2008. http://dx.doi.org/10.1109/baltic.2008.4625509.

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Rapports d'organisations sur le sujet "Seagrasse"

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Zimmerman, Richard C. Radiative Transfer in Seagrass Canopies. Fort Belvoir, VA : Defense Technical Information Center, septembre 1997. http://dx.doi.org/10.21236/ada629371.

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Zimmerman, Richard C. Radiative Transfer in Seagrass Canopies. Fort Belvoir, VA : Defense Technical Information Center, septembre 1999. http://dx.doi.org/10.21236/ada630542.

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Kyla Richards, Kyla Richards. Could Hawaii seagrasses be facing extinction ? Experiment, avril 2022. http://dx.doi.org/10.18258/26159.

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Koch, Evamaria W., Larry P. Sanford, Shih-Nan Chen, Deborah J. Shafer et Jane M. Smith. Waves in Seagrass Systems : Review and Technical Recommendations. Fort Belvoir, VA : Defense Technical Information Center, novembre 2006. http://dx.doi.org/10.21236/ada458760.

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Davis, Andy, Michael Feeley, Mario Londoño, Lee Richter, Judd Patterson et Andrea Atkinson. South Florida/Caribbean Network seagrass community monitoring : Protocol narrative—version 1.1. National Park Service, juillet 2022. http://dx.doi.org/10.36967/2293388.

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Eisemann, Eve, Safra Altman, Damarys Acevedo-Mackey et Molly Reif. Relating seagrass habitat to geomorphology and substrate characteristics around Ship Island, MS. Engineer Research and Development Center (U.S.), juin 2019. http://dx.doi.org/10.21079/11681/33023.

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Harrison, P. G., et M. Dunn. Fraser River delta seagrass ecosystems, their distributions and importance to migratory birds. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/215808.

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INTERIM BRIGADE COMBAT TEAM FORT LEWIS WA. Evaluation of the Use of Grid Platforms to Minimize Shading Impacts to Seagrasses. Fort Belvoir, VA : Defense Technical Information Center, mai 2001. http://dx.doi.org/10.21236/ada394903.

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Dobbs, Fred C., et Lisa A. Drake. Influence of Sedimentary and Seagrass Microbial Communities on Shallow-Water Benthic Optical Properties. Fort Belvoir, VA : Defense Technical Information Center, septembre 2008. http://dx.doi.org/10.21236/ada533632.

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Dobbs, Fred. Influence of Sedimentary and Seagrass Microbial Communities on Shallow Water Benthic Optical Properties. Fort Belvoir, VA : Defense Technical Information Center, septembre 1997. http://dx.doi.org/10.21236/ada634938.

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