Dynamics of trace metal concentrations in an intertidal rocky shore food chain

Wang, Wen‐Xiong; Wong, P.S.S.

doi:10.1016/j.marpolbul.2005.10.023

Cited by 16 publications

(14 citation statements)

References 19 publications

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“…Significant correlations were documented for a number of cases for Pb and Cu (S. acuminata vs. A. granosa (Gangadharpur, r = 0.52); S. acuminata vs. M. meretrix (r = 0.56); A. granosa vs. M. meretrix (r = 0.48) and M. meretrix vs. P. trigona (r = 0.48)) as well as Pb and Zn (S. acuminata vs. P. trigona (r = 0.64); A. granosa (s) vs. A. granosa (s) (r = 0.79), A. granosa vs. M. meretrix (r = 0.82)). Similar trends of correlations for Cd and Zn between mussels and oysters were also documented by Wang and Wong [57] while investigating trace metal concentrations in intertidal rocky shore in Hong Kong. Such correlations may be caused by similar uptake pathways on dietary food sources comprising phytoplankton and other detritus materials in the sediments.…”

Section: Statistical Analysessupporting

confidence: 82%

Biomonitoring of Heavy Metals Using the Bivalve Molluscs in Sunderban Mangrove Wetland, Northeast Coast of Bay of Bengal (India): Possible Risks to Human Health

Sarkar¹,

Cabral²,

Chatterjee

et al. 2008

CLEAN Soil Air Water

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The suitability of using four bivalve molluscs (Sanguinolaria acuminata, Anadara granosa, Meretrix meretrix, and Pelecyora trigona) in biomonitoring of heavy metals (Cu, Pb, Cd, Zn, and Hg) collected from intertidal regions of the Sunderban mangrove wetland, northeastern part of the Bay of Bengal, were evaluated. Both speciesdependent variability and temporal variations were pronounced. A high degree of organ specificity was evident in the bivalves where gill and mantle exhibited higher metal accumulation due to ion exchange property of the mucous layer covering these organs while shells represent very poor accumulation. Elevated values of Zn and Cu reflect high potential for biomagnification through marine food chain. Metal concentrations in different body size groups of the bivalves do not follow uniform trend. Correlation coefficient between different metal couplings as tested statistically revealed significant coupling for Pb -Zn, Pb -Cu, Zn -Cu, and Hg -Cu. Concentrations of all the metals in specific organs (visceral mass, mantle and gill) of the bivalves exceeded the safe levels according to the international standards for metals compiled by Food and Agricultural Organization of the United Nations and would be of great risk for human consumption. It is concluded that the mussel and clam are suitable biomonitors to employ in programs designed to assess changes in metal pollution in the Sunderban mangrove wetland.

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Section: Statistical Analysessupporting

confidence: 82%

Biomonitoring of Heavy Metals Using the Bivalve Molluscs in Sunderban Mangrove Wetland, Northeast Coast of Bay of Bengal (India): Possible Risks to Human Health

Sarkar¹,

Cabral²,

Chatterjee

et al. 2008

CLEAN Soil Air Water

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“…Other metal concentrations can be compared with the concentrations reported in Saccostrea cucullata oysters collected from the rocky shores of Clearwater Bay in Hong Kong [27]. Over a one-year sampling period, the Hong Kong concentrations were 0.7 to 3.0 mg/g for Ag, 1.2 to 5.0 mg/g for Cd, 0.6 to 1.4 mg/g for Cr, 309 to 870 mg/g for Cu, and 1300 to 3080 mg/g for Zn.…”

Section: Metal Contamination In Estuarine Oystersmentioning

confidence: 99%

Copper and zinc contamination in oysters: Subcellular distribution and detoxification

Wang

Yang

Guo

et al. 2011

Environmental Toxicology and Chemistry

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129

104

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Metal pollution levels in estuarine and coastal environments have been widely reported, but few documented reports exist of severe contamination in specific environments. Here, we report on a metal-contaminated estuary in Fujian Province, China, in which blue oysters (Crassostrea hongkongensis) and green oysters (Crassostrea angulata) were discovered to be contaminated with Cu and other metals. Extraordinarily high metal concentrations were found in the oysters collected from the estuary. Comparison with historical data suggests that the estuary has recently been contaminated with Cr, Cu, Ni, and Zn. Metal concentrations in blue oysters were as high as 1.4 and 2.4% of whole-body tissue dry wt for Cu and Zn, respectively. Cellular debris was the main subcellular fraction binding the metals, but metal-rich granules were important for Cr, Ni, and Pb. With increasing Cu accumulation, its partitioning into the cytosolic proteins decreased. In contrast, metallothionein-like proteins increased their importance in binding with Zn as tissue concentrations of Zn increased. In the most severely contaminated oysters, only a negligible fraction of their Cu and Zn was bound with the metal-sensitive fraction, which may explain the survival of oysters in such contaminated environments.

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“…However, in some seagrass species, rhizodeposition is greater than leaf exudation and can account for 15-30% of primary production [18,21]. Rhizodeposition is used synonymously with Rhizome + Root exudation throughout this document.…”

Section: Introductionmentioning

confidence: 99%

Influence of light, temperature and salinity on dissolved organic carbon exudation rates in Zostera marina L.

Kaldy

2012

Aquat Biosyst

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BackgroundMarine angiosperms, seagrasses, are sentinel species of marine ecosystem health and function. Seagrass carbon budgets provide insight on the minimum requirements needed to maintain this valuable resource. Carbon budgets are a balance between C fixation, growth, storage and loss rates, most of which are well characterized. However, relatively few measurements of dissolved organic carbon (DOC) leaf exudation or rhizodeposition rates exist for most seagrass species. Here I evaluate how eelgrass (Zostera marina L.) DOC exudation is affected by a single factor manipulation (light, temperature or salinity). Eelgrass plants were hydroponically exposed to treatments in experimental chambers (separate leaf and rhizome/root compartments) with artificial seawater medium. Regression analysis of changes in the DOC concentration through time was used to calculate DOC exudation rates.ResultsExudation rates were similar across all treatments in all experiments. For all experiments, pooled leaf DOC exudation ranged between 0.032 and 0.069 mg C gdw-1 h-1, while rhizodeposition ranged between 0.024 and 0.045 mg C gdw-1 h-1. These rates are consistent with previously published values and provide first-order estimates for mechanistic models.ConclusionsZostera marina carbon losses from either leaf exudation or rhizodeposition account for a small proportion of gross primary production (1.2-4.6%) and appear to be insensitive to short-term (e.g., hours to days) environmental variations in chamber experiments. Based on these preliminary experiments, I suggest that Z. marina DOC exudation may be a passive process and not an active transport process.

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Dynamics of trace metal concentrations in an intertidal rocky shore food chain

Cited by 16 publications

References 19 publications

Biomonitoring of Heavy Metals Using the Bivalve Molluscs in Sunderban Mangrove Wetland, Northeast Coast of Bay of Bengal (India): Possible Risks to Human Health

Biomonitoring of Heavy Metals Using the Bivalve Molluscs in Sunderban Mangrove Wetland, Northeast Coast of Bay of Bengal (India): Possible Risks to Human Health

Copper and zinc contamination in oysters: Subcellular distribution and detoxification

Influence of light, temperature and salinity on dissolved organic carbon exudation rates in Zostera marina L.

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