Remobilization and export of cadmium from lake sediments by emerging insects

Currie, Robert S.; Fairchild, Wayne L.; Muir, Derek C. G.

doi:10.1002/etc.5620161119

Cited by 33 publications

(23 citation statements)

References 33 publications

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“…To our knowledge, the values for adult midges are comparable to, or even lower than, cadmium levels in chironomid imagoes present in nonpolluted environments or habitats containing the same background levels as the reference sites in the present study [18,34]. However, these elevated levels dropped to background body burdens in adult midges.…”

Section: Shedding Of Accumulated Metalssupporting

confidence: 54%

Efficient Shedding of Accumulated Metals During Metamorphosis in Metal-Adapted Populations of the Midge Chironomus Riparius

Groenendijk¹,

Kraak²,

Admiraal³

1999

Environ Toxicol Chem

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Abstract-Metal accumulation and loss during metamorphosis were investigated in Chironomus riparius populations in a metal contaminated lowland river. Cadmium and zinc levels were measured in imagoes and larvae at reference and metal-exposed sites. It was hypothesized that the relationship between metal concentrations in biota and environmental compartments would be influenced by the presence of metal-adapted chironomids. In contrast to the large interpopulation differences in larval body burdens of cadmium, body burdens in imagoes vanished to background levels for all midge populations. This indicated that any cadmium accumulated in larval stages was lost during metamorphosis. This nearly 100% efficiency in shedding of cadmium is most likely caused by an increased metal handling capacity present in exposed midges. In agreement with the cadmium measurements, larval body burdens of zinc showed also highly significant interpopulation differences. In contrast with the cadmium values, however, body burdens of zinc in imagoes showed highly significant interpopulation differences and differences were even recorded between the two exposed sites, indicating interpopulation differences in shedding capacity for zinc. It is concluded that the highly efficient shedding of accumulated metals reflected the metal adaptation recorded in earlier studies of metal-exposed C. riparius populations from the River Dommel. Based on the differences in metal accumulation and the differences found in shedding of metals between the two exposed midge populations, it was concluded that population differentiation due to metal stress is a gradual process rather than an all-or-nothing situation.

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Section: Shedding Of Accumulated Metalssupporting

confidence: 54%

Efficient Shedding of Accumulated Metals During Metamorphosis in Metal-Adapted Populations of the Midge Chironomus Riparius

Groenendijk¹,

Kraak²,

Admiraal³

1999

Environ Toxicol Chem

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“…However, these elevated levels dropped to background body burdens in adult midges. To our knowledge, the values for adult midges are comparable to, or even lower than, cadmium levels in chironomid imagoes present in nonpolluted environments or habitats containing the same background levels as the reference sites in the present study (Timmermans & Walker 1989;Currie et al 1997). However, when Timmermans & Walker (1989) exposed C. riparius larvae from a reference laboratory culture for only ten days to the same cadmium concentration as measured at the PI location, larval body burdens were comparable with those in the present study, whereas the imagoes showed a hundred-fold increase in cadmium body burdens.…”

Section: Shedding Of Accumulated Metalsmentioning

confidence: 81%

Dynamics of metal adaptation in riverine chironomids

Groenendijk

Lücker

Plans

et al. 2002

Environmental Pollution

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“…Our results are the first evidence that aquatic contaminants can drastically reduce both resource and contaminant flux to terrestrial food webs across a regional gradient. Aquatic systems are increasingly viewed as sources of contaminants to riparian food webs with emerging aquatic insects acting as vectors of contaminant transport (Currie et al 1997, Walters et al 2008). Yet we and others find that the impacts of aquatic metals on riparian consumers are dominated by a loss of resource subsidies (in this case aquatic dipterans) rather than changes in either contaminant exposure or flux (this study, Paetzold et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Cross‐ecosystem impacts of stream pollution reduce resource and contaminant flux to riparian food webs

Kraus

Schmidt

Walters

et al. 2014

Ecological Applications

101

139

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The effects of aquatic contaminants are propagated across ecosystem boundaries by aquatic insects that export resources and contaminants to terrestrial food webs; however, the mechanisms driving these effects are poorly understood. We examined how emergence, contaminant concentration, and total contaminant flux by adult aquatic insects changed over a gradient of bioavailable metals in streams and how these changes affected riparian web-building spiders. Insect emergence decreased 97% over the metal gradient, whereas metal concentrations in adult insects changed relatively little. As a result, total metal exported by insects (flux) was lowest at the most contaminated streams, declining 96% among sites. Spiders were affected by the decrease in prey biomass, but not by metal exposure or metal flux to land in aquatic prey. Aquatic insects are increasingly thought to increase exposure of terrestrial consumers to aquatic contaminants, but stream metals reduce contaminant flux to riparian consumers by strongly impacting the resource linkage. Our results demonstrate the importance of understanding the contaminant-specific effects of aquatic pollutants on adult insect emergence and contaminant accumulation in adults to predict impacts on terrestrial food webs.

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Remobilization and export of cadmium from lake sediments by emerging insects

Abstract: Abstract-Emerging insects including, Diptera, Odonata, Ephemeroptera, and Trichoptera were collected from Lake 382 (L382) in 1991 and 1992 to estimate quantitatively the export of Cd by aquatic insects from a natural system having elevated Cd concentrations in the water and sediment.

Cited by 33 publications

References 33 publications

Efficient Shedding of Accumulated Metals During Metamorphosis in Metal-Adapted Populations of the Midge Chironomus Riparius

Efficient Shedding of Accumulated Metals During Metamorphosis in Metal-Adapted Populations of the Midge Chironomus Riparius

Dynamics of metal adaptation in riverine chironomids

Cross‐ecosystem impacts of stream pollution reduce resource and contaminant flux to riparian food webs

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