Trace Metal Cycling in Tropical-Subtropical Estuaries Dominated by the Seagrass Thalassia testudinum

Schroeder, Peter B.; Thorhaug, Anitra

doi:10.2307/2442200

Cited by 26 publications

(4 citation statements)

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“…Like Cd, seagrass Co concentrations were elevated in coastal sites, relative to HWK ( Table 1 ), and most of all in UB (1.87 ± 0.45 mg/kg), approximately four times higher than HWK (0.52 ± 0.21 mg/kg). Co is deemed beneficial to plants as micronutrients and was reported to actively accumulate in seagrass leaves and roots [ 49 , 50 ]. Co concentrations of up to four times higher than HWK have been reported in C .…”

Section: Discussionmentioning

confidence: 99%

Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef

et al. 2022

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Toxic metal exposure is a threat to green sea turtles (Chelonia mydas) inhabiting and foraging in coastal seagrass meadows and are of particular concern in local bays of the Great Barrier Reef (GBR), as numerous sources of metal contaminants are located within the region. Seagrass species tend to bioaccumulate metals at concentrations greater than that detected in the surrounding environment. Little is known regarding ecotoxicological impacts of environmental metal loads on seagrass or Chelonia mydas (C. mydas), and thus this study aimed to investigate and describe seagrass metal loads in three central GBR coastal sites and one offshore site located in the northern GBR. Primary seagrass forage of C. mydas was identified, and samples collected from foraging sites before and after the 2018/2019 wet season, and multivariate differences in metal profiles investigated between sites and sampling events. Most metals investigated were higher at one or more coastal sites, relative to data obtained from the offshore site, and cadmium (Cd), cobalt (Co), iron (Fe) and manganese (Mn) were found to be higher at all coastal sites. Principle Component Analysis (PCA) found that metal profiles in the coastal sites were similar, but all were distinctly different from that of the offshore data. Coastal foraging sites are influenced by land-based contaminants that can enter the coastal zone via river discharge during periods of heavy rainfall, and impact sites closest to sources. Bioavailability of metal elements are determined by complex interactions and processes that are largely unknown, but association between elevated metal loads and turtle disease warrants further investigation to better understand the impact of environmental contaminants on ecologically important seagrass and associated macrograzers.

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Section: Discussionmentioning

confidence: 99%

Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef

et al. 2022

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“…Element translocation dynamics in seagrasses are hard to elucidate since seagrasses take up trace elements by leaves and roots (Schroeder and Thorhaug, 1980). Thus, trace elements that mainly accumulate in the rhizomes are expected to have a high translocation rate either from leaves and/or roots.…”

Section: Discussionmentioning

confidence: 99%

The role of the seagrass <i>Posidonia oceanica</i> in the cycling of trace elements

et al. 2012

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Abstract. The aim of this study was to investigate the role of the seagrass Posidonia oceanica on the cycling of a wide set of trace elements (Ag, As, Ba, Bi, Cd, Co, Cr, Cs, Cu, Fe, Ga, Li, Mn, Ni, Pb, Rb, Sr, Tl, V and Zn). We measured the concentration of these trace elements in different compartments of P. oceanica (leaves, rhizomes, roots and epiphytes) in a non-polluted seagrass meadow representative of the Mediterranean and calculated the annual budget from a mass balance. We provide novel data on accumulation dynamics of many trace elements in P. oceanica compartments and demonstrate that trace element accumulation patterns are mainly determined by plant compartment rather than by temporal variability. Epiphytes were the compartment, which showed the greatest concentrations for most trace elements. Thus, they constitute a key compartment when estimating trace element transfer to higher trophic levels by P. oceanica. Trace element translocation in P. oceanica seemed to be low and acropetal in most cases. Zn, Cd, Sr and Rb were the trace elements that showed the highest release rate through decomposition of plant detritus, while Cs, Tl and Bi showed the lowest. P. oceanica acts as a sink of potentially toxic trace elements (Ni, Cr, As and Ag), which can be sequestered, decreasing their bioavailability. P. oceanica may have a relevant role in the cycling of trace elements in the Mediterranean.

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“…Seagrass-accumulated chemicals can be lost to surrounding water in a dissolved form and be exported bound to root and blade fragments at senescence. Although trace metal cycling in a Thalassia seagrass community has been modeled [81], the extent and magnitude of contaminant transfer, the transfer processes between seagrass ecosystem components (routes and flux rates) and the associated biological consequences to higher trophic levels are, to our knowledge, not available in the scientific literature for any seagrass ecosystem. Trace metal residues (cadmium, chromium, copper, lead, nickel, silver, zinc) have been determined for seagrass-associated fish, macroinvertebrates, echinoids, molluscs, and macroalgae [32,39,46,[48][49][50]68,69,71,79,[82][83][84].…”

Section: Contaminant Trophic Transfermentioning

confidence: 99%

Nonnutrient anthropogenic chemicals in seagrass ecosystems: Fate and effects

Lewis

Devereux

2009

Enviro Toxic and Chemistry

119

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Abstract-Impacts of human-related chemicals, either alone or in combination with other stressors, are important to understand to prevent and reverse continuing worldwide seagrass declines. This review summarizes reported concentrations of anthropogenic chemicals in grass bed-associated surface waters, sediments, and plant tissues and phytotoxic concentrations. Fate information in seagrass-rooted sediments and overlying water is most available for trace metals. Toxicity results in aqueous exposures are available for at least 13 species and a variety of trace metals, pesticides, and petrochemicals. In contrast, results for chemical mixtures and chemicals in sediment matrices are uncommon. Contaminant bioaccumulation information is available for at least 23 species. The effects of plant age, tissue type, and time of collection have been commonly reported but not biological significance of the chemical residues. Experimental conditions have varied considerably in seagrass contaminant research and interspecific differences in chemical residues and chemical tolerances are common, which limits generalizations and extrapolations among species and chemicals. The few reported risk assessments have been usually local and limited to a few single chemicals and species representative of the south Australian and Mediterranean floras. Media-specific information describing exposure concentrations, toxic effect levels, and critical body burdens of common near-shore contaminants is needed for most species to support integrated risk assessments at multiple geographical scales and to evaluate the ability of numerical effects-based criteria to protect these marine angiosperms at risk.

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Trace Metal Cycling in Tropical-Subtropical Estuaries Dominated by the Seagrass Thalassia testudinum

Cited by 26 publications

References 0 publications

Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef

Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef

The role of the seagrass <i>Posidonia oceanica</i> in the cycling of trace elements

Nonnutrient anthropogenic chemicals in seagrass ecosystems: Fate and effects

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Trace Metal Cycling in Tropical-Subtropical Estuaries Dominated by the Seagrass Thalassia testudinum

Cited by 26 publications

References 0 publications

Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef

Trace element concentrations in forage seagrass species of Chelonia mydas along the Great Barrier Reef

The role of the seagrass &lt;i&gt;Posidonia oceanica&lt;/i&gt; in the cycling of trace elements

Nonnutrient anthropogenic chemicals in seagrass ecosystems: Fate and effects

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The role of the seagrass <i>Posidonia oceanica</i> in the cycling of trace elements