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Population-level effects in Amphiascus tenuiremis: Contrasting simple and complex population models
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
RWTH Aachen University, Institute for Environmental Research, Department of Ecosystem Analysis, Worringerweg 1, D-520 74, Aachen, Germany.
RWTH Aachen University, Institute for Environmental Research, Chair of Environmental Biology and Chemodynamics, Worringerweg 1, D-520 74, Aachen, Germany.
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
(English)In: Aquatic Toxicology, ISSN 0166-445X, E-ISSN 1879-1514Article in journal (Refereed) Submitted
National Category
Environmental Sciences
Research subject
Ecotoxicology
Identifiers
URN: urn:nbn:se:su:diva-102548OAI: oai:DiVA.org:su-102548DiVA: diva2:710989
Available from: 2014-04-09 Created: 2014-04-09 Last updated: 2017-12-05
In thesis
1. Population modeling using harpacticoid copepods: Bridging the gap between individual-level effects and protection goals of environmental risk assessment
Open this publication in new window or tab >>Population modeling using harpacticoid copepods: Bridging the gap between individual-level effects and protection goals of environmental risk assessment
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

To protect the environment from contaminants, environmental risk assessment (ERA) evaluates the risk of adverse effects to populations, communities and ecosystems. Environmental management decisions rely on ERAs, which commonly are based on a few endpoints at the individual organism level. To bridge the gap between what is measured and what is intended for protection, individual-level effects can be integrated in population models, and translated to the population level. The general aim of this doctoral thesis was to extrapolate individual-level effects of harpacticoid copepods to the population level by developing and using population models. Matrix models and individual based models were developed and applied to life-history data of Nitocra spinipes and Amphiascus tenuiremis, and demographic equations were used to calculate population-level effects in low- and high-density populations. As a basis for the population models, individual-level processes were studied. Development was found to be more sensitive compared to reproduction in standard ecotoxicity tests measuring life-history data. Additional experimental animals would improve statistical power for reproductive endpoints, but at high labor and cost. Therefore, a new test-design was developed in this thesis. Exposing animals in groups included a higher number of animals without increased workload. The number of reproducing females was increased, and the statistical power of reproduction was improved. Individual-level effects were more or equally sensitive compared to population-level effects, and individual-level effects were translated to the population level to various degrees by population models of different complexities. More complex models showed stronger effects at the population level compared to the simpler models. Density dependence affected N. spinipes populations negatively so that toxicant effects were stronger at higher population densities. The tools presented here can be used to assess the toxicity of environmental contaminants at the individual and population level, improve ERA, and thereby the basis for environmental management.

Place, publisher, year, edition, pages
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2014. 36 p.
Keyword
Population modeling, (Eco)toxicity tests, Environmental risk assessment, Harpacticoid copepods
National Category
Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-102541 (URN)978-91-7447-894-5 (ISBN)
Public defence
2014-05-23, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 09:30 (English)
Opponent
Supervisors
Funder
Mistra - The Swedish Foundation for Strategic Environmental Research, 1323907
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Submitted. Paper 4: Manuscript.

Available from: 2014-04-30 Created: 2014-04-08 Last updated: 2014-05-29Bibliographically approved

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