Comparisons of Single-Species, Microcosm and Experimental Pond Responses to Atrazine Exposure

Larsen, David P.; deNoyelles, Frank; Stay, Frank S.; Shiroyama, Tamotsu

doi:10.1897/1552-8618(1986)5[179:cosmae]2.0.co;2

Cited by 19 publications

(19 citation statements)

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“…However, no consistent trend in sensitivity to atrazine and influence of planting design was observed across species, time period, or endpoint [22]. Larsen et al [23] compared the response to atrazine of algae in single-species cultures, microcosms, and experimental ponds and found that there were similarities among tests and that in some cases single-species tests were the most sensitive, while in others they were the least sensitive. Similar to the present study, Riemens et al [24] found that results from single-species experiments could not be translated into effects in mixtures.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the effects of glyphosate and atrazine herbicides on nontarget plants grown singly and in microcosms

Dalton

Boutin

2010

Enviro Toxic and Chemistry

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Intensification of agriculture and the corresponding increase in herbicide use has led to concern regarding the effects these chemicals may have on nontarget plants of agroecosystems. Current pesticide registration guidelines are focused on testing crop species grown singly in pots under greenhouse conditions and may not provide adequate measures of protection to noncrop species. The objective of the present study was to compare the response of terrestrial and wetland plants to the herbicides glyphosate and atrazine when grown singly in pots versus under different microcosm conditions. Greenhouse microcosms were generally more sensitive than single-species tests. Plants grown for an extended test period or in seminatural field conditions were generally less sensitive to herbicides. Sensitivity was found to be dependent on interactions between species and test conditions. Changes in community structure were observed in herbicide-treated microcosms that would not be predicted from single-species testing. Single-species tests are useful because they are inexpensive, can demonstrate clear dose-response patterns uncomplicated by other factors influencing growth, and are able to provide a measure of the sensitivity of a given species to glyphosate and atrazine. However, they are unable to predict subtle changes in community structure that may have important long-term consequences.

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Section: Discussionmentioning

confidence: 99%

Comparison of the effects of glyphosate and atrazine herbicides on nontarget plants grown singly and in microcosms

Dalton

Boutin

2010

Enviro Toxic and Chemistry

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“…To overcome the limitations of single species tests, studies are often conducted in simulated experimental ecosystesms such as microcosms, mesocosms, and outdoor experimental ponds. Larsen et al (1986) examined the effects of atrazine in single species laboratory tests and experimental microcosms in order to compare the utility of single species tests for predicting community-level responses under more realistic conditions. Laboratory EC50 values were determined for 8 species of algae exposed to atrazine for 24 hr using 14 C uptake as a measurement endpoint.…”

Section: Direct Effects On Aquatic Plantsmentioning

confidence: 99%

Structural and Functional Effects of Herbicides on Non-Target Organisms in Aquatic Ecosystems with an Emphasis on Atrazine

Fairchild¹

2011

Herbicides and Environment

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“…(1999) ont mis en évidence l'importance du rôle de la température sur la sensibilité d'une cyanobactérie à l'atrazine. D'autres études (CAUX et KENT, 1995 ;TURBAK et al, 1986) insistent sur le rôle des nutriments dans la réponse des algues aux herbicides ; LARSEN et al (1986) et KASAI étal. (1991 obtiennent parfois des CE50 différentes avec les mêmes algues selon le milieu de culture dans lequel les bioessais sont réalisés.…”

Section: Paramètres Physico-chimiquesunclassified

Les herbicides inhibateurs du photosystème II, effets sur les communautés algales et leur dynamique

Bérard¹,

Pelte

2005

rseau

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Nous présentons une revue bibliographique à propos des effets des herbicides inhibiteurs du Photosystème II (PS II) sur les communautés algales. Ces herbicides sont abondamment utilisés dans les pratiques phytosanitaires. Ils sont susceptibles de contaminer les milieux aquatiques et, étant donné leur mode d'action inhibitrice de la photosynthèse, ils peuvent agir directement sur les algues. De nombreuses études ont été réalisées afin d'évaluer l'impact des contaminations par ces herbicides sur les microphytes, en particulier leur effet sur la croissance et la physiologie de certaines algues (monocultures en laboratoire). D'autres études expérimentales et quelques rares in situ, ont porté sur l'impact des herbicides inhibiteurs de la photosynthèse sur la structure des peuplements algaux. Certaines tendances ont pu être ainsi dégagées quant à la sensibilité et la résistance aux herbicides des différentes espèces étudiées soit isolément, soit au sein des peuplements. Les herbicides inhibiteurs du PS II perturbent effectivement la structure des peuplements phytoplanctoniques de façon plus ou moins marquée. L'impact des herbicides sur les algues est variable selon la structure des peuplements (liée aux successions) et les paramètres environnementaux, notamment liés à la saison. Nous devons donc développer nos connaissances à propos des interactions entre toxiques et facteurs environnementaux sur des pas de temps correspondant non seulement aux rythmes des contaminations mais aussi aux rythmes des succesions alagles, car ces interactions sont susceptibles de réduire ou d'amplifier les conséquences d'une pollution par ces toxiques dans les milieux aquatiques.The aim of this paper is to present a review about the impact of Photo system II (PS II) inhibitors on algae communities. A brief discussion of the use in agriculture, the different chemical families, the photosynthetic inhibition effect and the occurrence of these compounds in aquatics systems is followed by the presentation of the impacts these herbicides have on algae. Many studies investigate the effects of PS II inhibitors on algae growth and physiology. The response to pollutants were studied by monitoring changes in terms of different parameters : chlorophyll fluorescence induction usually increases with PS II inhibitors. Concentration of pigments decreases with PS II inhibitors, but increases sometimes with low contaminations of these toxicants (it is probably an homeostasis effect). Pigment ratio can change with herbicide exposure. Primary production (measured by 14C incorporation or dissolved O2) usually decreases with PS II inhibitors. But, the " excretion " of dissolved organic compounds may increase with PS II inhibitors. These herbicides may alter or change cell morphology of algae. In consequence algae growth is inhibited by PS II inhibitors exposure. But growth inhibition varies, depending on each species' (and strain) sensibility or resistance to each herbicide. By this way, PS II inhibitors can affect the algae community structure. In consequence, ...

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Comparisons of Single-Species, Microcosm and Experimental Pond Responses to Atrazine Exposure

Cited by 19 publications

References 0 publications

Comparison of the effects of glyphosate and atrazine herbicides on nontarget plants grown singly and in microcosms

Comparison of the effects of glyphosate and atrazine herbicides on nontarget plants grown singly and in microcosms

Structural and Functional Effects of Herbicides on Non-Target Organisms in Aquatic Ecosystems with an Emphasis on Atrazine

Les herbicides inhibateurs du photosystème II, effets sur les communautés algales et leur dynamique

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