Modeling toxic stress by atrazine in a marine consumer-resource system

L. De Hoop, M. De Troch, A.J. Hendriks, F. De Laender

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The present study combines short-term experiments with food chain modeling to explore the long-term effects of the herbicide atrazine on consumer-resource dynamics in a marine intertidal ecosystem. Short-term (28 d) lab experiments indicated that the intrinsic rate of increase (r) and carrying capacity (K) of the marine diatom Seminavis robusta decreased with increasing atrazine exposure. This decrease did not show the concave shape expected from the lifetime productivity for nonexposed diatoms and from single-species toxicity data in the literature but instead was described best by a linear model. These experimentally observed atrazine-induced decreases of r and K were used to parameterize a Rosenzweig-MacArthur model representing a simple food chain including the tested diatom and its grazer, the harpacticoid copepod Delavalia palustris var. palustris. Stable oscillation zoo-phytobenthos systems were produced at diatom exposures of 0, 100, and 150μg/L atrazine. An atrazine concentration of 150μg/L contributed to a 15% increase of the oscillation periods of both diatoms and copepods as well as a 52% reduction of oscillation amplitudes compared with the control situation. Although the amplitudes of copepods increased only 7% at 150μg/L atrazine, the maximum and minimum copepod densities at that concentration were reduced 61 and 63%, respectively. The effects of atrazine on periodicity and amplitudes were robust to 20% changes in the food-chain model parameters that represented allometric relationships. The simulations in the present study suggest food chain-mediated indirect effects on zoobenthos populations, indicating a reduced diatom and copepod availability throughout the year.
langue originaleAnglais
Pages (de - à)1088-1095
Nombre de pages8
journalEnvironmental Toxicology and Chemistry
Volume32
Numéro de publication5
Les DOIs
étatPublié - 1 mai 2013

Empreinte digitale

Atrazine
Poisons
Diatoms
atrazine
Copepoda
Food Chain
diatom
food chain
resource
modeling
oscillation
phytobenthos
zoobenthos
Aquatic ecosystems
zoo
Conservation of Natural Resources
Herbicides
Periodicity
carrying capacity
periodicity

Citer ceci

De Hoop, L. ; De Troch, M. ; Hendriks, A.J. ; De Laender, F. / Modeling toxic stress by atrazine in a marine consumer-resource system. Dans: Environmental Toxicology and Chemistry. 2013 ; Vol 32, Numéro 5. p. 1088-1095.
@article{268ea1e4d4b34a7d81f1333937fbe1f1,
title = "Modeling toxic stress by atrazine in a marine consumer-resource system",
abstract = "The present study combines short-term experiments with food chain modeling to explore the long-term effects of the herbicide atrazine on consumer-resource dynamics in a marine intertidal ecosystem. Short-term (28 d) lab experiments indicated that the intrinsic rate of increase (r) and carrying capacity (K) of the marine diatom Seminavis robusta decreased with increasing atrazine exposure. This decrease did not show the concave shape expected from the lifetime productivity for nonexposed diatoms and from single-species toxicity data in the literature but instead was described best by a linear model. These experimentally observed atrazine-induced decreases of r and K were used to parameterize a Rosenzweig-MacArthur model representing a simple food chain including the tested diatom and its grazer, the harpacticoid copepod Delavalia palustris var. palustris. Stable oscillation zoo-phytobenthos systems were produced at diatom exposures of 0, 100, and 150μg/L atrazine. An atrazine concentration of 150μg/L contributed to a 15{\%} increase of the oscillation periods of both diatoms and copepods as well as a 52{\%} reduction of oscillation amplitudes compared with the control situation. Although the amplitudes of copepods increased only 7{\%} at 150μg/L atrazine, the maximum and minimum copepod densities at that concentration were reduced 61 and 63{\%}, respectively. The effects of atrazine on periodicity and amplitudes were robust to 20{\%} changes in the food-chain model parameters that represented allometric relationships. The simulations in the present study suggest food chain-mediated indirect effects on zoobenthos populations, indicating a reduced diatom and copepod availability throughout the year.",
author = "{De Hoop}, L. and {De Troch}, M. and A.J. Hendriks and {De Laender}, F.",
year = "2013",
month = "5",
day = "1",
doi = "10.1002/etc.2160",
language = "English",
volume = "32",
pages = "1088--1095",
journal = "Environmental Toxicology and Chemistry",
issn = "0730-7268",
publisher = "John Wiley and Sons Ltd",
number = "5",

}

Modeling toxic stress by atrazine in a marine consumer-resource system. / De Hoop, L.; De Troch, M.; Hendriks, A.J.; De Laender, F.

Dans: Environmental Toxicology and Chemistry, Vol 32, Numéro 5, 01.05.2013, p. 1088-1095.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Modeling toxic stress by atrazine in a marine consumer-resource system

AU - De Hoop, L.

AU - De Troch, M.

AU - Hendriks, A.J.

AU - De Laender, F.

PY - 2013/5/1

Y1 - 2013/5/1

N2 - The present study combines short-term experiments with food chain modeling to explore the long-term effects of the herbicide atrazine on consumer-resource dynamics in a marine intertidal ecosystem. Short-term (28 d) lab experiments indicated that the intrinsic rate of increase (r) and carrying capacity (K) of the marine diatom Seminavis robusta decreased with increasing atrazine exposure. This decrease did not show the concave shape expected from the lifetime productivity for nonexposed diatoms and from single-species toxicity data in the literature but instead was described best by a linear model. These experimentally observed atrazine-induced decreases of r and K were used to parameterize a Rosenzweig-MacArthur model representing a simple food chain including the tested diatom and its grazer, the harpacticoid copepod Delavalia palustris var. palustris. Stable oscillation zoo-phytobenthos systems were produced at diatom exposures of 0, 100, and 150μg/L atrazine. An atrazine concentration of 150μg/L contributed to a 15% increase of the oscillation periods of both diatoms and copepods as well as a 52% reduction of oscillation amplitudes compared with the control situation. Although the amplitudes of copepods increased only 7% at 150μg/L atrazine, the maximum and minimum copepod densities at that concentration were reduced 61 and 63%, respectively. The effects of atrazine on periodicity and amplitudes were robust to 20% changes in the food-chain model parameters that represented allometric relationships. The simulations in the present study suggest food chain-mediated indirect effects on zoobenthos populations, indicating a reduced diatom and copepod availability throughout the year.

AB - The present study combines short-term experiments with food chain modeling to explore the long-term effects of the herbicide atrazine on consumer-resource dynamics in a marine intertidal ecosystem. Short-term (28 d) lab experiments indicated that the intrinsic rate of increase (r) and carrying capacity (K) of the marine diatom Seminavis robusta decreased with increasing atrazine exposure. This decrease did not show the concave shape expected from the lifetime productivity for nonexposed diatoms and from single-species toxicity data in the literature but instead was described best by a linear model. These experimentally observed atrazine-induced decreases of r and K were used to parameterize a Rosenzweig-MacArthur model representing a simple food chain including the tested diatom and its grazer, the harpacticoid copepod Delavalia palustris var. palustris. Stable oscillation zoo-phytobenthos systems were produced at diatom exposures of 0, 100, and 150μg/L atrazine. An atrazine concentration of 150μg/L contributed to a 15% increase of the oscillation periods of both diatoms and copepods as well as a 52% reduction of oscillation amplitudes compared with the control situation. Although the amplitudes of copepods increased only 7% at 150μg/L atrazine, the maximum and minimum copepod densities at that concentration were reduced 61 and 63%, respectively. The effects of atrazine on periodicity and amplitudes were robust to 20% changes in the food-chain model parameters that represented allometric relationships. The simulations in the present study suggest food chain-mediated indirect effects on zoobenthos populations, indicating a reduced diatom and copepod availability throughout the year.

UR - http://www.scopus.com/inward/record.url?scp=84876413473&partnerID=8YFLogxK

U2 - 10.1002/etc.2160

DO - 10.1002/etc.2160

M3 - Article

AN - SCOPUS:84876413473

VL - 32

SP - 1088

EP - 1095

JO - Environmental Toxicology and Chemistry

JF - Environmental Toxicology and Chemistry

SN - 0730-7268

IS - 5

ER -