BIOACCUMULATION OF THE AGRICULTURAL PESTICIDE ENDOSULFAN BY PHYTOPLANKTON AND ASSOCIATED FOOD WEB EFFECTS. DeLorenzo, M E, Lund, S A, Strozier, E D, Taylor, L A, & Scott, G I abstract bibtex Agricultural pesticide runoff in southeast coastal regions is a critical issue, while studies involving pesticide effects on microorganisms are limited. Having a high surface area:volume ratio, plankton have significant potential for pesticide uptake and related toxicity. Organochlorine insecticides, such as endosulfan, preferentially partition out of water, into sediments and tissues. Accumulation of pesticides by phytoplankton and zooplankton at the base of the aquatic food web may increase the persistence of pesticides in aquatic ecosystems and lead to higher trophic level effects. This study investigated the potential of the phytoplankton species, Selenastrum capricornutum (freshwater green alga) to sequester the widely used agricultural pesticide, endosulfan. We also examined the degree to which endosulfan is accumulated by Daphnia magna (freshwater cladoceran) via water and via food (endosulfan-contaminated S. capricornutum ). An average bioconcentration factor (BCF) of 2735 was determined for S. capricornutum exposed to 100 µg/L endosulfan for 16 hours. Both parent isomers (endosulfan I and endosulfan II) and the primary degradation product (endosulfan sulfate) were detected in the algal extract. An average BCF of 3259 was determined for D. magna in a 100 µg/L endosulfan water-only exposure. There was negligible uptake of endosulfan by D. magna feeding on contaminated algae (BCF~0). Endosulfan was rapidly accumulated and concentrated from water by S. capricornutum and D. magna neonates. Endosulfan contained in phytoplankton, however, was not bioaccumulated by zooplankton. These findings may prove useful in assessing ecosystem risk, since water concentration alone allows prediction of plankton BCF.
@article{delorenzo_bioaccumulation_nodate,
title = {{BIOACCUMULATION} {OF} {THE} {AGRICULTURAL} {PESTICIDE} {ENDOSULFAN} {BY} {PHYTOPLANKTON} {AND} {ASSOCIATED} {FOOD} {WEB} {EFFECTS}},
abstract = {Agricultural pesticide runoff in southeast coastal regions is a critical issue, while studies involving pesticide effects on microorganisms are limited. Having a high surface area:volume ratio, plankton have significant potential for pesticide uptake and related toxicity. Organochlorine insecticides, such as endosulfan, preferentially partition out of water, into sediments and tissues. Accumulation of pesticides by phytoplankton and zooplankton at the base of the aquatic food web may increase the persistence of pesticides in aquatic ecosystems and lead to higher trophic level effects. This study investigated the potential of the phytoplankton species, Selenastrum capricornutum (freshwater green alga) to sequester the widely used agricultural pesticide, endosulfan. We also examined the degree to which endosulfan is accumulated by Daphnia magna (freshwater cladoceran) via water and via food (endosulfan-contaminated S. capricornutum ). An average bioconcentration factor (BCF) of 2735 was determined for S. capricornutum exposed to 100 µg/L endosulfan for 16 hours. Both parent isomers (endosulfan I and endosulfan II) and the primary degradation product (endosulfan sulfate) were detected in the algal extract. An average BCF of 3259 was determined for D. magna in a 100 µg/L endosulfan water-only exposure. There was negligible uptake of endosulfan by D. magna feeding on contaminated algae (BCF{\textasciitilde}0). Endosulfan was rapidly accumulated and concentrated from water by S. capricornutum and D. magna neonates. Endosulfan contained in phytoplankton, however, was not bioaccumulated by zooplankton. These findings may prove useful in assessing ecosystem risk, since water concentration alone allows prediction of plankton BCF.},
language = {en},
author = {DeLorenzo, M E and Lund, S A and Strozier, E D and Taylor, L A and Scott, G I},
keywords = {⛔ No DOI found},
}
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Accumulation of pesticides by phytoplankton and zooplankton at the base of the aquatic food web may increase the persistence of pesticides in aquatic ecosystems and lead to higher trophic level effects. This study investigated the potential of the phytoplankton species, Selenastrum capricornutum (freshwater green alga) to sequester the widely used agricultural pesticide, endosulfan. We also examined the degree to which endosulfan is accumulated by Daphnia magna (freshwater cladoceran) via water and via food (endosulfan-contaminated S. capricornutum ). An average bioconcentration factor (BCF) of 2735 was determined for S. capricornutum exposed to 100 µg/L endosulfan for 16 hours. Both parent isomers (endosulfan I and endosulfan II) and the primary degradation product (endosulfan sulfate) were detected in the algal extract. An average BCF of 3259 was determined for D. magna in a 100 µg/L endosulfan water-only exposure. There was negligible uptake of endosulfan by D. magna feeding on contaminated algae (BCF~0). Endosulfan was rapidly accumulated and concentrated from water by S. capricornutum and D. magna neonates. Endosulfan contained in phytoplankton, however, was not bioaccumulated by zooplankton. These findings may prove useful in assessing ecosystem risk, since water concentration alone allows prediction of plankton BCF.","language":"en","author":[{"propositions":[],"lastnames":["DeLorenzo"],"firstnames":["M","E"],"suffixes":[]},{"propositions":[],"lastnames":["Lund"],"firstnames":["S","A"],"suffixes":[]},{"propositions":[],"lastnames":["Strozier"],"firstnames":["E","D"],"suffixes":[]},{"propositions":[],"lastnames":["Taylor"],"firstnames":["L","A"],"suffixes":[]},{"propositions":[],"lastnames":["Scott"],"firstnames":["G","I"],"suffixes":[]}],"keywords":"⛔ No DOI found","bibtex":"@article{delorenzo_bioaccumulation_nodate,\n\ttitle = {{BIOACCUMULATION} {OF} {THE} {AGRICULTURAL} {PESTICIDE} {ENDOSULFAN} {BY} {PHYTOPLANKTON} {AND} {ASSOCIATED} {FOOD} {WEB} {EFFECTS}},\n\tabstract = {Agricultural pesticide runoff in southeast coastal regions is a critical issue, while studies involving pesticide effects on microorganisms are limited. Having a high surface area:volume ratio, plankton have significant potential for pesticide uptake and related toxicity. Organochlorine insecticides, such as endosulfan, preferentially partition out of water, into sediments and tissues. Accumulation of pesticides by phytoplankton and zooplankton at the base of the aquatic food web may increase the persistence of pesticides in aquatic ecosystems and lead to higher trophic level effects. This study investigated the potential of the phytoplankton species, Selenastrum capricornutum (freshwater green alga) to sequester the widely used agricultural pesticide, endosulfan. We also examined the degree to which endosulfan is accumulated by Daphnia magna (freshwater cladoceran) via water and via food (endosulfan-contaminated S. capricornutum ). An average bioconcentration factor (BCF) of 2735 was determined for S. capricornutum exposed to 100 µg/L endosulfan for 16 hours. Both parent isomers (endosulfan I and endosulfan II) and the primary degradation product (endosulfan sulfate) were detected in the algal extract. An average BCF of 3259 was determined for D. magna in a 100 µg/L endosulfan water-only exposure. There was negligible uptake of endosulfan by D. magna feeding on contaminated algae (BCF{\\textasciitilde}0). Endosulfan was rapidly accumulated and concentrated from water by S. capricornutum and D. magna neonates. Endosulfan contained in phytoplankton, however, was not bioaccumulated by zooplankton. 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