Method for Collecting Invertebrate Drift from the Surface and Bottom in Large Rivers

Wefring, David R.; Hopwood, Alfred J.

doi:10.1577/1548-8659(1981)43[108:mfcidf]2.0.co;2

Cited by 5 publications

(4 citation statements)

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“…More recent papers considering methods include Armitage (1978), Bogatov (1980), Shustov & Shirkov (1980), Hobbs & Butler (1981), Wefring & Hopwood (1981), Bourneaud et al (1984), Field-Dodgson (1985 and Williams (1985) . The equipment used to sample drift varies widely, ranging from single nets suspended in the stream, through nets blocking the whole stream, to pump samplers which filter a known proportion of the stream discharge.…”

Section: Methodsmentioning

confidence: 99%

Invertebrate drift ? A review

1988

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This paper reviews the literature on invertebrate drift in running waters, emphasising papers published during the last 10-15 years . The terms constant drift, catastrophic drift, behavioural drift, active drift and distributional drift are defined, but their use should be limited as much confusion has arisen . Sampling methods are briefly reviewed .The composition of drift in streams and rivers is assessed, especially with respect to temporal variation, drift densities and drift distances . This body of descriptive literature is subsequently analysed in relation to both abiotic and biotic variables, such as current/discharge, photoperiod, temperature, benthic densities, predators and life cycle stage .The ecosystem significance of drift in terms of colonization and distribution, population dynamics and its importance as a food resource are then reviewed and discussed . Drift enables organisms to escape unfavourable conditions and gives them the potential to colonize new habitats . However, mortality poses a constant threat . The drift community is composed of components whose presence in the drift may be due to widely differing reasons . This renders unsuccessful most attempts to explain drift in terms of one or even a few factors, except in extreme cases, such as floods or pollution . The question whether drifting organisms are alive, dead, or "ecologically dead" is seldom addressed, as is variation at the level of the individual .The drift literature is dominated by large numbers of descriptive papers and there is a need for laboratory and field studies aimed at testing specific hypotheses .

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Section: Methodsmentioning

confidence: 99%

Invertebrate drift ? A review

1988

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“…Up to this last decade, macroinvertebrates in lower courses of large rivers were rarely studied due to sampling difficulties (Elliot & Tullet, 1978& 1983Wefrung & Hopwood, 1981), high seasonal hydrological variations and also because of polluted reaches. Hence, only a few macroinvertebrate studies (Fruget, 1992) have been reported for the Lower Rh6ne River between Lyon and the Camargue delta.…”

Section: Introductionmentioning

confidence: 99%

Environmental and macroinvertebrate dynamics in the Lower Rhône River and a lateral dike field: a study matching two functioning descriptors

et al. 1995

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Environmental variables and macroinvertebrate communities are studied in two sites of the Lower Rh6ne River, the main channel and a lateral, occasionally connected dike field. Environmental variables and faunistic communities allow discrimination the two compartments. The environmental and faunistic differences the two sites change over time. The physical and chemical differences are significantly correlated with water discharge of the main channel. The faunistic ones are significantly correlated with the temperature of the dike field water. The connections between the main channel and the dike field could be very important to maintain a high heterogeneity of the habitat, and for recolonization of the main channel after a perturbation.

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“…Drifting macrophytes have been noted in the Detroit River and in other channels connecting the Laurentian Great Lakes (Hunt, 1962 ;Michigan Water Resources Commission, 1967 ;Bryant & Nuhfer, 1984), but their contribution to the movement of contaminants has not been investigated . All previous studies of drift in large rivers, including the Great Lakes channels, have either ignored drifting macrophytes (Galtsoff, 1924 ;Wefring & Hopwood, 1981 ;Pocklington & Tan, 1987 ;Admiraal & Van Zanten, 1988 ;Lau et al, 1989) or presented only qualitative information about them, not including their contaminant content (Poe & Edsall, 1982 ;Jude et al, 1986 ;Edwards et al, 1989) . Because we suspected that aquatic plants contained contaminants and knew they were the major energy source for secondary production in this river (Edwards et al, 1989) we investigated the heavy metal content of macrophytes drifting down the Detroit River into Lake Erie .…”

Section: Introductionmentioning

confidence: 99%

Heavy metals in aquatic macrophytes drifting in a large river

1991

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Macrophytes drifting throughout the water column in the Detroit River were collected monthly from May to October 1985 to estimate the quantities of heavy metals being transported to Lake Erie by the plants .Most macrophytes (80-92% by weight) drifted at the water surface . Live submersed macrophytes made up the bulk of each sample . The most widely distributed submersed macrophyte in the river, American wildcelery (Yallisneria americana), occurred most frequently in the drift . A total of 151 tonnes (ash-free dry weight) of macrophytes drifted out of the Detroit River from May to October . The drift was greatest (37 tonnes) in May . Concentrations of heavy metals were significantly higher in macrophytes drifting in the river than in those growing elsewhere in unpolluted waters . Annually, a maximum of 2 796 kg (eight heavy metals combined) were transported into Lake Erie by drifting macrophytes . The enrichment of all metals was remarkably high (range : 4000 x to 161000 x ) in macrophytes, relative to their concentration in water of the Detroit River . Detroit River macrophytes are thus a source of contaminated food for animals in the river and in Lake Erie .

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Method for Collecting Invertebrate Drift from the Surface and Bottom in Large Rivers

Cited by 5 publications

References 0 publications

Invertebrate drift ? A review

Invertebrate drift ? A review

Environmental and macroinvertebrate dynamics in the Lower Rhône River and a lateral dike field: a study matching two functioning descriptors

Heavy metals in aquatic macrophytes drifting in a large river

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