Effects of the herbicide atrazine on adenine nucleotide levels in Zostera marina L. (eelgrass)

Delistraty, Damon; Hershner, Carl

doi:10.1016/0304-3770(84)90056-1

Cited by 18 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, seagrass can also grow in intertidal habitat (which is particularly common in the GBR) where they are also periodically exposed to extremely high (full sun) light levels, which can add oxidative stress. For example, Delistraty and Hershner [59] reported growth inhibition in response to 100 µg l -1 Atrazine under high light conditions of 500-1000 µE m -2 s -1 and mortality (mostly likely due to oxidative stress) was observed after as little as 7 days.…”

Section: Discussionmentioning

confidence: 99%

Phytotoxicity of Four Photosystem II Herbicides to Tropical Seagrasses

et al. 2013

View full text Add to dashboard Cite

Coastal waters of the Great Barrier Reef (GBR) are contaminated with agricultural pesticides, including the photosystem II (PSII) herbicides which are the most frequently detected at the highest concentrations. Designed to control weeds, these herbicides are equally potent towards non-target marine species, and the close proximity of seagrass meadows to flood plumes has raised concerns that seagrasses may be the species most threatened by herbicides from runoff. While previous work has identified effects of PSII herbicides on the photophysiology, growth and mortality in seagrass, there is little comparative quantitative toxicity data for seagrass. Here we applied standard ecotoxicology protocols to quantify the concentrations of four priority PSII herbicides that inhibit photochemistry by 10, 20 and 50% (IC10, IC20 and IC50) over 72 h in two common seagrass species from the GBR lagoon. The photosystems of seagrasses Zostera muelleri and Halodule uninervis were shown to be generally more sensitive to the PSII herbicides Diuron, Atrazine, Hexazinone and Tebuthiuron than corals and tropical microalgae. The herbicides caused rapid inhibition of effective quantum yield (∆F/F m ′), indicating reduced photosynthesis and maximum effective yields (Fv/Fm) corresponding to chronic damage to PSII. The PSII herbicide concentrations which affected photosynthesis have been exceeded in the GBR lagoon and all of the herbicides inhibited photosynthesis at concentrations lower than current marine park guidelines. There is a strong likelihood that the impacts of light limitation from flood plumes and reduced photosynthesis from PSII herbicides exported in the same waters would combine to affect seagrass productivity. Given that PSII herbicides have been demonstrated to affect seagrass at environmental concentrations, we suggest that revision of environmental guidelines and further efforts to reduce PSII herbicide concentrations in floodwaters may both help protect seagrass meadows of the GBR from further decline.

show abstract

Section: Discussionmentioning

confidence: 99%

Phytotoxicity of Four Photosystem II Herbicides to Tropical Seagrasses

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Thalassia testudinum Oxygen production 40h, 88h 320 (EC50) [71] Zostera marina Oxygen production 24h 100i, 1000ti [70] Zostera marina Oxygen production 21-42d 75e, 650i [69] Zostera marina Adenine nucleotides 6h, 21d 10, 100 [76] Growth Mortality Zostera marina Growth 10-40d 1900 (first effect, whole plant) [ Table 2. Example of toxic effect concentrations reported for atrazine and seagrasses.…”

Section: Test Species Response Parameters Test Duration Effect Concenmentioning

confidence: 99%

“…However, some remarks are necessary: (1) like for many environmental monitoring, metrology improvement since decades enhances phenomena perception: concentrations reached 30 years ago could be regarded as overestimated, (2) interspecies heterogeneity could be important: Halodule wrightii growth is enhanced at 120µg/L [75] when, at the same concentration Ruppia maritima photosynthesis IC50 is reached [42] and Zostera marina presents mortalities [76] (3) Zostera marina mortalities [76] are noted for concentrations considered as stimulating [69], but in the second case after much more exposition time, (5) the effect is less and recovery is greater in situ [74].…”

Section: Test Species Response Parameters Test Duration Effect Concenmentioning

confidence: 99%

Herbicide Impact on Seagrass Communities

Devault¹,

Pascaline²

2013

Herbicides - Current Research and Case Studies in Use

View full text Add to dashboard Cite

“…BESTER & H• 1994). As the herbicidal impact of triazines and phenylureas is based on the inhibition of the photosystem II of the plants, these compounds mayas well affect higher plants as seagrass or macroalgae (DELISTRATY & HERSHNER 1984). As seagrass Zostera no#ii communities in the German Wadden Sea ate drastically declining, the question arose whether of not herbicide pollution of the respective areas is related to this phenomenon.…”

Section: Introductionmentioning

confidence: 99%