Is ecosystem structure the target of concern in ecological effect assessments?

F. De Laender, K.A.C. De Schamphelaere, P.A. Vanrolleghem, C.R. Janssen

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The species sensitivity distribution, a technique currently used to derive water-quality standards of chemicals, is associated with a set of inadequately tested assumptions. One of these assumptions is that ecosystem structure is as or more sensitive than ecosystem function, i.e., that structure is the target of concern. In this paper, we tested this assumption for a simple freshwater ecosystem exposed to different toxicants. Using an ecosystem model, we calculated no observed effect concentrations (NOECs) for ecosystem structure (ecosystem structure-NOECs) and function (ecosystem function-NOECs) for each of 1000 hypothetical toxicants. For 979 of these toxicants, the ecosystem structure-NOEC was lower than or equal to the ecosystem function-NOEC, indicating that the tested assumption can be considered valid. For 239 of these 979 toxicants, both NOECs were equal. For half of the 1000 toxicants, the structure of lower trophic levels (i.e., phytoplankton) appears to be more sensitive than the structure of higher trophic levels (i.e., fish). As such, ecosystem structure-NOECs are primarily determined by the sensitivity of the structure of lower trophic levels. In contrast, ecosystem functions associated with higher trophic levels (e.g., total ingestion by fish) are more sensitive than functions associated with lower trophic levels (e.g., total photosynthesis by phytoplankton) for 749 toxicants.
langue originaleAnglais
Pages (de - à)2395-2402
Nombre de pages8
journalComputational Optimization and Application
Volume42
Numéro de publication10-11
Les DOIs
étatPublié - 1 mai 2008
Modification externeOui

Empreinte digitale

ecosystem structure
dose-response relationship
Ecosystems
trophic level
ecosystem function
Phytoplankton
phytoplankton
Fish
freshwater ecosystem
fish
effect
photosynthesis
Photosynthesis
water quality
ecosystem
Water quality

Citer ceci

De Laender, F. ; De Schamphelaere, K.A.C. ; Vanrolleghem, P.A. ; Janssen, C.R. / Is ecosystem structure the target of concern in ecological effect assessments?. Dans: Computational Optimization and Application. 2008 ; Vol 42, Numéro 10-11. p. 2395-2402.
@article{e1bad4b5672e468187ace0cc04ceecce,
title = "Is ecosystem structure the target of concern in ecological effect assessments?",
abstract = "The species sensitivity distribution, a technique currently used to derive water-quality standards of chemicals, is associated with a set of inadequately tested assumptions. One of these assumptions is that ecosystem structure is as or more sensitive than ecosystem function, i.e., that structure is the target of concern. In this paper, we tested this assumption for a simple freshwater ecosystem exposed to different toxicants. Using an ecosystem model, we calculated no observed effect concentrations (NOECs) for ecosystem structure (ecosystem structure-NOECs) and function (ecosystem function-NOECs) for each of 1000 hypothetical toxicants. For 979 of these toxicants, the ecosystem structure-NOEC was lower than or equal to the ecosystem function-NOEC, indicating that the tested assumption can be considered valid. For 239 of these 979 toxicants, both NOECs were equal. For half of the 1000 toxicants, the structure of lower trophic levels (i.e., phytoplankton) appears to be more sensitive than the structure of higher trophic levels (i.e., fish). As such, ecosystem structure-NOECs are primarily determined by the sensitivity of the structure of lower trophic levels. In contrast, ecosystem functions associated with higher trophic levels (e.g., total ingestion by fish) are more sensitive than functions associated with lower trophic levels (e.g., total photosynthesis by phytoplankton) for 749 toxicants.",
author = "{De Laender}, F. and {De Schamphelaere}, K.A.C. and P.A. Vanrolleghem and C.R. Janssen",
year = "2008",
month = "5",
day = "1",
doi = "10.1016/j.watres.2008.01.006",
language = "English",
volume = "42",
pages = "2395--2402",
journal = "Computational Optimization and Application",
issn = "0043-1354",
publisher = "Elsevier Limited",
number = "10-11",

}

Is ecosystem structure the target of concern in ecological effect assessments? / De Laender, F.; De Schamphelaere, K.A.C.; Vanrolleghem, P.A.; Janssen, C.R.

Dans: Computational Optimization and Application, Vol 42, Numéro 10-11, 01.05.2008, p. 2395-2402.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Is ecosystem structure the target of concern in ecological effect assessments?

AU - De Laender, F.

AU - De Schamphelaere, K.A.C.

AU - Vanrolleghem, P.A.

AU - Janssen, C.R.

PY - 2008/5/1

Y1 - 2008/5/1

N2 - The species sensitivity distribution, a technique currently used to derive water-quality standards of chemicals, is associated with a set of inadequately tested assumptions. One of these assumptions is that ecosystem structure is as or more sensitive than ecosystem function, i.e., that structure is the target of concern. In this paper, we tested this assumption for a simple freshwater ecosystem exposed to different toxicants. Using an ecosystem model, we calculated no observed effect concentrations (NOECs) for ecosystem structure (ecosystem structure-NOECs) and function (ecosystem function-NOECs) for each of 1000 hypothetical toxicants. For 979 of these toxicants, the ecosystem structure-NOEC was lower than or equal to the ecosystem function-NOEC, indicating that the tested assumption can be considered valid. For 239 of these 979 toxicants, both NOECs were equal. For half of the 1000 toxicants, the structure of lower trophic levels (i.e., phytoplankton) appears to be more sensitive than the structure of higher trophic levels (i.e., fish). As such, ecosystem structure-NOECs are primarily determined by the sensitivity of the structure of lower trophic levels. In contrast, ecosystem functions associated with higher trophic levels (e.g., total ingestion by fish) are more sensitive than functions associated with lower trophic levels (e.g., total photosynthesis by phytoplankton) for 749 toxicants.

AB - The species sensitivity distribution, a technique currently used to derive water-quality standards of chemicals, is associated with a set of inadequately tested assumptions. One of these assumptions is that ecosystem structure is as or more sensitive than ecosystem function, i.e., that structure is the target of concern. In this paper, we tested this assumption for a simple freshwater ecosystem exposed to different toxicants. Using an ecosystem model, we calculated no observed effect concentrations (NOECs) for ecosystem structure (ecosystem structure-NOECs) and function (ecosystem function-NOECs) for each of 1000 hypothetical toxicants. For 979 of these toxicants, the ecosystem structure-NOEC was lower than or equal to the ecosystem function-NOEC, indicating that the tested assumption can be considered valid. For 239 of these 979 toxicants, both NOECs were equal. For half of the 1000 toxicants, the structure of lower trophic levels (i.e., phytoplankton) appears to be more sensitive than the structure of higher trophic levels (i.e., fish). As such, ecosystem structure-NOECs are primarily determined by the sensitivity of the structure of lower trophic levels. In contrast, ecosystem functions associated with higher trophic levels (e.g., total ingestion by fish) are more sensitive than functions associated with lower trophic levels (e.g., total photosynthesis by phytoplankton) for 749 toxicants.

UR - http://www.scopus.com/inward/record.url?scp=43049131048&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2008.01.006

DO - 10.1016/j.watres.2008.01.006

M3 - Article

AN - SCOPUS:43049131048

VL - 42

SP - 2395

EP - 2402

JO - Computational Optimization and Application

JF - Computational Optimization and Application

SN - 0043-1354

IS - 10-11

ER -