Effects of nutrient loading and insecticide application on the ecology of Elodea-dominated freshwater microcosms I. Responses of plankton and zooplanktivorous insects

Donk, Ellen Van; Prins, H.; Voogd, H.; Crum, Sjh; Brock, T.C.M.

doi:10.1127/archiv-hydrobiol/133/1995/417

Cited by 33 publications

(3 citation statements)

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“…The same conclusion was reached by Cuppen et al (1995) where chlorpyrifos caused an adverse direct effect on the zooplankton community under a combined exposure of insecticide with nutrients. Previous studies report negative effects on zooplankton abundance under 1 μg/L chlorpyrifos exposure (van Wijngaarden et al, 2005), however, in our experiment we did not observe a negative impact on zooplankton abundance even under a higher chlorpyrifos concentration of 2 µg/L.…”

Section: Resultscontrasting

confidence: 99%

“…The results obtained show that zooplankton abundance did not respond to the treatments, while richness and Shannon diversity were lower in both treatments with pulsed insecticide (NI and N_I) compared to the N treatment and did not show significant differences between the synchronous (NI) and asynchronous (N_I) treatments. This result agrees with studies that showed the effects of chlorpyrifos in nutrient-enriched systems appeared to be independent of its mixture with nutrients (Van Donk et al, 1995). The same conclusion was reached by Cuppen et al (1995) where chlorpyrifos caused an adverse direct effect on the zooplankton community under a combined exposure of insecticide with nutrients.…”

Section: Resultssupporting

confidence: 91%

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The response of freshwater plankton communities to temporal concurrence of agrochemical mixtures

Arco¹,

Parra²,

Downing³

2023

Limnetica

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Freshwater ecosystems regularly experience pulsed inputs of nutrients and other pollutants as a result of temporally variable applications of agrochemicals combined with runoff events. In this study, we evaluate how planktonic communities respond to repeated and pulsed insecticide disturbances and if the response depends on temporal concurrence with nutrient pulses. We conducted an experiment using mesocosms to assess the ecotoxicological effects of a commonly used insecticide (chlorpyrifos) and nutrients (nitrogen and phosphorus) on plankton communities. The mesocosms (300 L) were established outdoors for 10 weeks. The experiment consisted of 3 treatments: nutrient pulse of nitrogen and phosphorus every two weeks (N; considered as control), nutrients and insecticide pulsed simultaneously every two weeks (NI), and nutrients and insecticide pulsed in alternating weeks (N_I). Insecticide and nutrient pulses consisted of 2 μg/L of chlorpyrifos, 560 μg/L of nitrogen, and 39.9 μg/L of phosphorus. Zooplankton abundance, community structure, and diversity were used as structural indicators. Chlorophyll a and net production were used as functional indicators. We found no effect of the treatments on zooplankton abundance, while richness and Shannon diversity was lower in treatments with pulsed insecticide (NI and N_I) compared to control treatment (N). Phytoplankton biomass was higher in the treatments with insecticide than in the controls (N). Higher phytoplankton biomass could be explained by an indirect effect shift from a cladocera-dominated to a copepod-dominated community in response to the insecticide treatment. Overall, the insecticide disturbance had direct and indirect effects on the community and did not depend on whether insecticides were pulsed synchronously or asynchronously with nutrients.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 91%

The response of freshwater plankton communities to temporal concurrence of agrochemical mixtures

Arco¹,

Parra²,

Downing³

2023

Limnetica

View full text Add to dashboard Cite

show abstract

“…Direct toxicity in the laboratory predicts acute and chronic effects at greater concentrations than used in the microcosms (58), suggesting that these increases may have resulted from effects on physiological processes, such as reproduction. Some chemical stressors have been shown to increase abundance of zooplankton in microcosm studies (59)(60)(61)(62). This may change trophic relationships and interactions and ultimately cause adverse effects on the structure and function of an ecosystem (63).…”

Section: Discussionmentioning

confidence: 99%

Structural and Functional Responses of Plankton to a Mixture of Four Tetracyclines in Aquatic Microcosms

Wilson

Brain

Sanderson

et al. 2004

Environ. Sci. Technol.

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Pharmaceuticals are routinely detected at low concentrations in surface waters, but effects on non-target organisms are not well understood. Microcosms were used to assess ecological responses in freshwater ecosystems to a mixture offourtetracyclines commonly used in veterinary and human medicine. Triplicate microcosms were treated with tetracycline, oxytetracycline, doxycycline, and chlortetracycline, resulting in measured time-weighted average total mixture concentrations of 0, 0.080, 0.218, 0.662, and 2.29 microM, respectively. Responses were assessed in terms of structure and function based on measurements of zooplankton and phytoplankton communities, ecosystem productivity, and water quality. Effects were observed for some endpoints> or = the 0.218 microM treatment. The largest responses were concentration-dependent reductions in total phytoplankton abundance and species richness. Phytoplankton abundance recovered to control levels in all microcosms after treatment was terminated, and resilience (time to return to normal operating range during stress) was observed with respectto phytoplankton species richness. Zooplankton were generally unaffected by the tetracyclines. Responses also included decreased water clarity, lower oxygen concentration, and water temperature. Functional endpoints showed varying sensitivity. On the basis of dissolved oxygen concentrations, community respiration (R) increased while primary productivity (P) was unchanged with increased treatment concentration. The effects observed occurred at considerably greater concentrations than are currently measured in the environment, indicating minimal risk to aquatic organisms.

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Drainage Ditches

2004

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Drainage ditches are unique aquatic ecosystems that have gone virtually unnoticed by the scientific community. These systems are often considered nothing more than conduits for water transport from wet or moist areas, when indeed they serve as crucial sites for contaminant transfer and transformation. In many parts of the world, ditches also serve as refuges for endangered species of flora and fauna. Maintenance of drainage ditches is a subject that stirs intense debate between farmers, landowners, scientists, and regulators. Finding a balance between efficient water transport and ditch water quality improvements is a growing field of concern. Various characteristics of drainage ditches are identified, with an emphasis on ditches in agricultural systems. Also included is a brief history of drainage ditches, as well as past and present drainage ditch research, and a brief synopsis of future ditch research directions.

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Effects of nutrient loading and insecticide application on the ecology of Elodea-dominated freshwater microcosms I. Responses of plankton and zooplanktivorous insects

Cited by 33 publications

References 0 publications

The response of freshwater plankton communities to temporal concurrence of agrochemical mixtures

The response of freshwater plankton communities to temporal concurrence of agrochemical mixtures

Structural and Functional Responses of Plankton to a Mixture of Four Tetracyclines in Aquatic Microcosms

Drainage Ditches

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