Seagrass meadows as proxy for assessment of ecosystem health

Robin, R.S.; Ganguly, Dipnarayan; Hariharan, G.; Singh, Gurmeet; Raghuraman, R.; Ramachandran, Ramesh

doi:10.1016/j.ocecoaman.2017.11.026

Cited by 26 publications

(26 citation statements)

References 29 publications

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“…In August, salinity was above 35 psu at all stations which was due to the dissemination of ASHSW to even the Palk Bay region due to water exchange between the Palk Bay and the Gulf of Mannar . Purvaja et al (2018) have also reported that the salinity in this region ranged from 32.4 to 37.3 psu during dry season and 33.1 to 35.6 psu in wet season.…”

Section: Variability Of Physico-chemical Parametersmentioning

confidence: 71%

“…After the bloom the nutrient levels dropped to 0.074 µmol l −1 , 0.562 µmol l −1 , 0.748 µmol l −1 , and 1.415 µmol l −1 for nitrite, nitrate, phosphate and silicate respectively. It is reported that nutrient concentrations in Palk Bay vary spatially and temporally with a distinct change in N: P ratios between dry (3.5:1) and wet (13:1) seasons, indicating intense nitrogen limitation during dry season (Purvaja et al, 2018). A gradual increase in salinity was noticed during August in Palk Bay.…”

Section: Variability Of Physico-chemical Parametersmentioning

confidence: 98%

“…The leaching of this organic matter out of the fish culture cage is reflected in the CDOM value outside the fish culture cage (1.920 ppb QSDE). Purvaja et al (2018) have reported that Palk Bay had a marginally increased concentration of suspended particulate matter and higher input of sediments from land based sources during the wet season. Sedimentation rate at Mandapam area is nearly 38.54 mg cm −2 d −1 during monsoon season.…”

Section: Variability Of Physico-chemical Parametersmentioning

confidence: 99%

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Effect of Mariculture on bio-optical properties and water quality of Gulf of Mannar and Palk Bay

Shaju

Prasad

Vishnu

et al. 2019

Regional Studies in Marine Science

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h i g h l i g h t s• This study presents the first in-situ bio-optical data for the Coastal Waters Gulf of Mannar and Palk Bay.• High temporal and spatial variability in the absorption components were observed in the present work.• The biogeochemistry and phytoplankton biomass of the effect of Trichodesmium bloom on the Coastal Waters Gulf of Mannar and Palk Bay were studied. a b s t r a c tMarine cage aquaculture is gaining importance in India, due to its contribution as an alternate livelihood to coastal communities and also because of its export value. Water quality is the most important determinant for sustainable marine cage farming. Nutrient enrichment in coastal waters results in increased occurrence of algal blooms. A mariculture practice makes the coastal waters eutrophic due to increased input of nitrogen and phosphorous, ultimately leading to bloom. A phytoplankton bloom dominated by Trichodesmium species was detected outside mariculture cages located in Gulf of Mannar during August, 2015, which possibly interfered with fish gill function. High nutrient and chlorophyll a (Chl-a) (29.97 mg/m 3 ) concentration were observed during peak bloom period. Three groups of phytoplankton were identified -diatoms (24 species with, 14 centric species and 10 pennate species), dinoflagellates (10 species) and cyanobacteria (one species). Stable salinity condition and the depletion in nutrient concentration due to higher primary production might have triggered the bloom of Trichodesmium. In-situ bio-optical measurements were also made to understand the spatial and temporal variation and effect of bloom on the optical components. Our study is a preliminary step to understanding the in-situ bio-geochemical and bio-optical characteristics of coastal waters of Gulf of Mannar and Palk Bay, which could aid in the management of cage culture sites.

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Section: Variability Of Physico-chemical Parametersmentioning

confidence: 71%

Section: Variability Of Physico-chemical Parametersmentioning

confidence: 98%

Section: Variability Of Physico-chemical Parametersmentioning

confidence: 99%

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Effect of Mariculture on bio-optical properties and water quality of Gulf of Mannar and Palk Bay

Shaju

Prasad

Vishnu

et al. 2019

Regional Studies in Marine Science

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“…H. beccarii play an important role in coastal protection and sediment stabilization (Jagtap et al, 2003;Kaladharan et al, 2018), but more studies are required on this aspect to understand the various process involved in the coastal protection services. H. beccarii and its association with mangroves or seagrasses acts as ecological engineers to enhance the water quality and increase associated biodiversity of coastal ecosystems (Jagtap et al, 1983;Mathews et al, 2010a;Purvaja et al, 2018). This ecological connectivity between mangrove-seagrass has been recently reported from India (Mishra and Apte, 2020a;Mishra and Kumar, 2020c) and should be further explored using H. beccarii, as this seagrass forms climax communities that helps in establishing mangrove population.…”

Section: Ecological Significance Of H Beccariimentioning

confidence: 91%

“…Use of seagrass ecosystems for WQI, SLI, Bioindicators of Metals Mathews et al, 2010a;Purvaja et al, 2018, Jagtap, 1983…”

Section: Sl No Ecosystem Servicementioning

confidence: 99%

The Current Status of <em>Halophila beccarii</em>: An Ecologically Significant, Yet Vulnerable Seagrass of India

Mishra

Apte

2020

Preprint

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We reviewed the current status of a Vulnerable seagrass, Halophila beccarii from the coast of India using the published data from 1977-2020. We found that the seagrass, H. beccarii has a pan India distribution on both east and west coast. It is abundant in the intertidal silty-muddy region on the west coast, while on the east coast it is found on sandy habitats, with few exceptions of muddy habitat. H. beccarii was found to be associated with mangroves or smaller seagrass species within a depth limit of 1.7m. Low salinity and high nitrate levels were observed for the H. beccarii meadows of the west coast due to its association with mangroves. The nutrient levels in H. beccarii meadows of India were comparatively lower than other seagrass meadows. Most of the research on H. beccarii has focoused on its morphometrics (41%), reproductive (33%) and distribution (29%) along the coast of India. Reproductive traits such as flowering and fruiting varying according to the seasons of each coast due to the influence of monsoon and its associated temperature, salinity and nutrient influx. H. beccarii has a great potential of various bioactive compounds, which needs further investigation. Habitat disturbance, anthropogenic pollution and coastal development are the major cause of declining H. beccarii ecosystems in India. Significant loss of the seagrass was observed from the west coast of India due to increased coastal development activities. There is a significant need in quantifying H. beccarii population trends, impact of climate and anthropogenic stressors, economic values of ecosystem services and the role of ecological connectivity for better conservation and management of H. beccarii seascapes across India. There is a need for integration of research outcomes in policy framing for preventing the decline and further loss of this vulnerable seagrass ecosystem.

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Dynamic assessment of restored ecosystem health based on pressure‐state‐response subsystem‐system model in a karst trough valley

Qiong,

Yongjun,

Yina

et al. 2023

Ecohydrology

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Limited soil and water resources in a sloping karst trough valley have negatively affected the local population and ecosystem health. A deeper understanding of karst ecosystem health and its driving mechanism are important for ecosystem management and restoration. In recent decades, the karst trough valley has been exposed to multiple threats from various natural and anthropogenic factors. Assessment of which is essential to understand the state of the karst ecosystem and to develop a suitable, scientifically proven management strategy. Based on the pressure‐state‐response‐subsystem‐system (PSR‐SS) model, the restored ecosystem health of karst trough valley was assessed from 2000 to 2015 at the grid scale. The principal component analysis (PCA) method was adopted to explore the factors driving ecosystem health change. It is found that from the years of 2000 to 2015, there was an improvement in ecosystem health in karst trough valley ecosystem. Land use analysis maps indicate a slight decrease in woodland and grassland and increase in cropland and urban buildup, and the Land coverage increased from 84.87% to 87.64%. The area of karst rock desertification decreased by 75.3 km2 from 2000 to 2015. The AEH indices of 0.27 (2000), 0.45 (2005), 0.46 (2010) and 0.68 (2015), which indicate moderate warning, pre‐warning, early warning and generally healthy, respectively. The 17 selected driving factors were grouped into two broad categories by PCA, one is national policy, and the other one is natural condition and local activities. National policy was to be found the most important influence on ecosystem health. Our findings emphasize the key role of government in ecosystem health change, which would give directions to the sustainable development of karst trough valley areas.

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Seagrass meadows as proxy for assessment of ecosystem health

Cited by 26 publications

References 29 publications

Effect of Mariculture on bio-optical properties and water quality of Gulf of Mannar and Palk Bay

Effect of Mariculture on bio-optical properties and water quality of Gulf of Mannar and Palk Bay

The Current Status of <em>Halophila beccarii</em>: An Ecologically Significant, Yet Vulnerable Seagrass of India

Dynamic assessment of restored ecosystem health based on pressure‐state‐response subsystem‐system model in a karst trough valley

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