Temporal variation of phytoplankton growth and grazing loss in the west coast of Peninsular Malaysia

Lim, Joon Hai; Lee, Choon Weng; Kudo, Isao

doi:10.1007/s10661-015-4487-5

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…3): very low values (<0.5 μmol l − 1 DIN) are seen especially during the late NE monsoon and intermonsoon 1, which are similar to reports from the open Sunda Shelf and the South China Sea (Kartadikaria et al, 2015;Liu et al, 2020;Ning et al, 2004). In contrast, nutrient concentrations during the SW monsoon are significantly elevated, and similar to values reported from the Malacca Strait (Lim et al, 2015(Lim et al, , 2021. However, chlorophyll-a concentrations were above 0.4 μg l − 1 in all but two samples, and averaged about 1 μg l − 1 (Fig.…”

Section: Seasonality and Range In Dissolved Nutrient Concentrationssupporting

confidence: 85%

“…Closer to shore and within estuaries, significant levels of eutrophication due to nutrient input have been reported, with chlorophyll-a of 5-50 μg l − 1 at some sites (Chai et al, 2021;Damar et al, 2019;Lim et al, 2018Lim et al, , 2021Tomascik et al, 1994). However, very few studies have collected multi-year biogeochemical time series in Southeast Asia (Lim et al, 2015(Lim et al, , 2018. This hampers our understanding of the drivers of coastal biogeochemistry in Southeast Asia.…”

Section: Introductionmentioning

confidence: 99%

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Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait

Martin

Moynihan

Chen

et al. 2021

Preprint

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Section: Seasonality and Range In Dissolved Nutrient Concentrationssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait

Martin

Moynihan

Chen

et al. 2021

Preprint

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“…As a result, numerous SA coastal areas have experienced pollution and excessive chlorophyll-a levels. Lim et al (2015) reported that the coastal water systems along the Malacca straits has chlorophyll-a level up to 2.76 mg/m 3. Another SA coastal area deserves attention is located in Jakarta.…”

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confidence: 99%

Does Social Distancing Have an Effect on Water Quality? : An Evidence from Chlorophyll-a Level in the Water of Populated Southeast Asian Coasts

Adwibowo¹

2020

Preprint

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The COVID 19 related social distancing is hypothesized can affect the environmental quality including the air and water quality. Correspondingly, this study aims to study how the reduction of activities of people living near the rivers and the coastal areas due to social distancing may decrease the discharges of materials and nutrients to the water body. The chlorophyll-a was used as bio indicators of nutrient contents related to the anthropogenic activities in the coast. The study was conducted in the Jakarta coast considering that this coast was surrounded by populated cities with total population equal to 16 million people. The chlorophyll-a was measured in mg/m3 and monitored using remote sensing data from January to April 2020 representing the period before and after the implementation of social distancing. The determinant environmental factor measured was sea surface temperature (0C). The study considered that there were reductions of levels and areas of chlorophyll-a in the coast. The chlorophyll-a levels were reduced from January to April (p<0.05). The chlorophyll-a levels for January, February, March, and April were 7.36 mg/m3 (95%CI: 6.34-8.37), 7.90 mg/m3 (95%CI: 7.32-8.47), 6.52 mg/m3 (95%CI: 5.37-7.66), and 4.21 mg/m3 (95%CI: 3.34-5.07) respectively. However, the differences of chlorophyll-a were not influenced by the sea surface temperature factor (p>0.05). Based on remote sensing data in January and February, the sizes of coastal areas with chlorophyll-a levels >7.00 mg/m3 were larger than areas observed in March and April. Contrarily, the coastal area sizes with low chlorophyll-a levels <5.00 mg/m3 were increasing in April. To conclude the dynamic of anthropogenic activities in coastal setting is responsible and associated with the water quality and nutrient contents as indicated by chlorophyll-a levels.

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“…The prevailing poor water quality in nearshore waters as indicated by low dissolved oxygen concentrations close to hypoxia and high total suspended solids (TSS) have also been documented ( Lee & Bong, 2006 ). The Klang Strait has been classified as a eutrophic environment with episodic phytoplankton blooms and high bacteria abundance ( Lee & Bong, 2006 ; Lee, Bong & Hii, 2009 ; Lim, Lee & Kudo, 2015 ). While there are no marked changes in deep water fish production, the catch per unit effort of coastal fisheries due to shrimp and bag net catches has dropped dramatically since the mid-1990s despite little change in the fishing effort (see ).…”

Section: Introductionmentioning

confidence: 99%

Response of marine copepods to a changing tropical environment: winners, losers and implications

Chew

Chong

2016

PeerJ

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Background. Climate change concurrent with anthropogenic disturbances can initiate serial changes that reverberate up the food chain with repercussions for fisheries. To date, there is no information available concerning the combined effects of global warming and human impacts on tropical marine food webs. While temperate copepods respond differently to warming and environmental stressors, the extent to which tropical copepods can adapt to rising temperature of already warm waters remains unknown. We hypothesize that sea warming and other anthropogenic disturbances over the long term will have the greatest impact on the copepod community in nearshore waters where their effects are accentuated, and therefore vulnerable and resilient species could be identified.Methods. Zooplankton samples were collected during two time periods (1985–86 and 2014–15) interposed by marked anthropogenic disturbances, and at the same five stations located progressively from inshore to offshore in Klang Strait, Malaysia, following the asymmetrical before-after-control-impact (BACI) design. Copepods were identified to species, and results were interpreted by univariate (ANOVA) and multivariate (PERMANOVA, PCO) analyses of the computed species abundance and diversity measures.Results. Copepod total abundance was not significantly different among stations but higher after disturbance than before disturbance. However, changes in the abundance of particular species and the community structure between time periods were dramatic. Coastal large-bodied calanoid species (e.g., Acartia spinicauda, Calanopia thompsoni, Pseudodiaptomus bowmani and Tortanus forcipatus) were the most vulnerable group to disturbance. This however favored the opportunistic species (e.g., Oithona simplex, O. attenuata, Hemicyclops sp., Pseudomacrochiron sp. and Microsetella norvegica). Small-bodied copepods (e.g., Paracalanus sp., Parvocalanus crassirostris and Euterpina acutifrons) were unaffected. Centropages tenuiremis was likely an introduced species. There was no significant loss in species richness of copepods despite the dramatic changes in community structure.Discussion. Sea warming and other human-induced effects such as eutrophication, acidification and coastal habitat degradation are likely the main factors that have altered copepod community structure. The large-bodied estuarine and coastal calanoid copepods are surmised to be vulnerable to eutrophication and hypoxia, while both resilient and opportunistic species are largely unaffected by, or adaptable to, degraded coastal environments and observed sea surface temperature (SST) rise. It is forecasted that SST rise with unmitigated anthropogenic impacts will further reduce large-bodied copepod species the favoured food for fish larvae with dire consequences for coastal fish production.

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Temporal variation of phytoplankton growth and grazing loss in the west coast of Peninsular Malaysia

Cited by 13 publications

References 37 publications

Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait

Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait

Does Social Distancing Have an Effect on Water Quality? : An Evidence from Chlorophyll-a Level in the Water of Populated Southeast Asian Coasts

Response of marine copepods to a changing tropical environment: winners, losers and implications

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