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Asian Journal of Geographical Research
https://doi.org/10.9734/AJGR/2024/V7I1223…
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Nearly every shallow coastal region on Earth is home to seagrass, a type of marine flowering plant. They grow down to depths where just 11% of surface light reaches the bottom after colonizing soft substrates like mud, sand, and cobbles. Seagrasses often choose wave-sheltered environments where sediments are shielded from waves and currents. The seagrass environment serves as a home to large animals like dugongs and marine mammals like ducks and geese. The seagrass serves as a feeding and refuge area for the related creatures for the entirety or a portion of their life cycles. Raw materials and food, medicine, fertilizer, coastal protection, erosion control, water purification, fisheries maintenance, nursery grounds, invertebrate habitats, carbon sequestration, tourism, recreation, support for education, and research are just a few of the goods and services provided by seagrass to the coastal community. The value of a seagrass ecosystem's products and services to human well-being can be measured, and this can be used to support the need for seagrass ecosystem preservation, transfer, and regeneration. Many valuation studies are conducted to estimate the various goods and services produced by the seagrass ecosystem. The total area of seagrass distribution in the coastal States and UTs of India is 51822 ha, distributed in Policy Article
Ecological Research Monographs, 2014
E3S Web of Conferences
This study investigates the status and anthropogenic pressures on seagrass ecosystem. Urbanization and tourism in the coastal areas of Bintan, Indonesia were increasing in the recent years. They have become new pressures to intertidal ecosystem and habitats, particularly seagrass ecosystem. Seagrass meadows are the important ecosystem and habitats in Bintan region. They provide a wide range of ecosystem services, including for small-scale fisheries and have being Dugongs (Dugong dugon) habitats for food. Currently, the sea grass status is less healthy or damaged with 11 species. The anthropogenic disturbance processes have affected the spatial distribution, percent coverage, biodiversity, and community structure of sea grass. Moreover, several species are hard to find. Directly, sea grass meadows are impacted by introduced coastal development (i.e. settlement area, tourism accommodation, port, etc.), land-based pollution, reclamation, boating traffic, dredging activities and tourism...
International Journal of Current Research Vol. 6, Issue, 10, pp.8997--9005, October, 2014, 2014
Seagrasses are one of the predominant groups of marine flora that grows in tidal and subtidal region of the shallow coastal environment. Spatial variability of seagrass distribution, biomass, canopy height, productivity and environmental parameters were recorded at 24 stations all along the Tamilnadu coast during 2011 and 2012. Thirteen seagrass species of six genera were recorded, among which H. ovalis was found to be distributed all along the coast of Tamilnadu, and C. serrulata was found densely populated in the shallow coastal regions of Palk Bay and Gulf of Mannar (GOM). H. beccarii is the rare species found only in Vellar estuary of Parangipettai. Biomass (36.2 gfr.wt.m-2-1218 gfr.wt.m-2), productivity (0.01 g C m-2 d-1-4.34 g C m-2 d-1) and canopy height (0.28cm-107.73 cm) of seagrass species varied among all species of seagrasses. Correlation coefficient indicate that the local environmental parameters, particularly inorganic phosphate and total phosphorus are two important nutrients and sediment texture play a prominent role in influencing seagrass biomass, productivity and canopy height by enhancing the growth of seagrasses. Hence the present study suggests continuous monitoring of ecological and biological variables in time and space is highly required for managing the resources efficiently.
Ecology, 1977
We report for first time about tropical seagrass meadows association with mangrove ecosystems and its effect on seagrass population dynamics off India in Andaman Sea. Two sites of Neil island, i.e. site 1, associated with mangroves and site 2 without mangroves were 1 selected. Quadrat sampling (n=5) were used to collect sediment and seagrass samples. 1 Reconstruction techniques were used to derive population age structure. T. hemprichii 1 population was found mostly with sandy substrate at both sites, with silt consisting very low 1 fraction at site 1. Density, biomass, productivity and morphometric features of T. hemprichii 1 were significantly higher at site1. Reproductive density was higher at site 1, whereas 1 reproductive effort to produce fruits were higher at site 2. The rhizome (vertical+ horizontal) 1 production rates were higher at site 1 and the vertical elongation rate was higher at site 2. 1 Plastochrome interval for site1 and 2 were 25.49 and 26.80 days respectively leading to 1 formation of 14.31 and 13.62 leaves per year. T. hemprichii population at site 1 had four 1 years of longevity and higher younger plants compared to site 2. The long-term average 2 recruitment and present recruitment rate were higher at site 1 compared to site 2, resulting in 2 steady state growth of the overall population at site 1. Higher number of younger plants 2 suggests fitness of the T. hemprichii population at site 1, which increases the ecological 2 significance of mangrove ecosystems have on seagrass population dynamics. This association 2 should be considered for better management and conservation practices of coastal seascapes 2 under global change scenarios.
Journal of the Marine Biological Association of India
The southeast coast of India bordering Gulf of Mannar and Palk Bay has luxuriant growth of seagrass beds which sustain good fisheries and is a biodiversity hotspot. Many fishers living along the coast depend on these resources for their livelihood. Several species of invertebrates and vertebrates fully depend on the seagrass resources for their survival and sustenance. In this paper, the diversity of species commonly associated with the seagrass beds and their present status is presented followed by the fisheries associated with this ecosystem. The type of fishing activities including the details of crafts, gears, number of fishers involved and catch statistics are presented. The main objective of this approach is to understand how the fishing activities influence the ecosystem and fishermen. Underwater monitoring and visual observations were documented through photographs and videos. Artisanal fishing activities such as bottom set gillnet, push net, lead-fish trap net and shore seine are in detail discussed and the conservation measures which are urgently required are also presented.