COMPARING POPULATION RECOVERY AFTER INSECTICIDE EXPOSURE FOR FOUR AQUATIC INVERTEBRATE SPECIES USING MODELS OF DIFFERENT COMPLEXITY
Authored by Nika Galic, den Brink Paul J Van, J M (Hans) Baveco, Steve Norman, Ivo Roessink
Date Published: 2014
DOI: 10.1002/etc.2605
Sponsors:
Dutch Ministries
Dow AgroSciences
Platforms:
NetLogo
Model Documentation:
Other Narrative
Mathematical description
Model Code URLs:
Model code not found
Abstract
Population models, in particular individual-based models (IBMs), are
becoming increasingly important in chemical risk assessment. They can be
used to assess recovery of spatially structured populations after
chemical exposure that varies in time and space. The authors used an IBM
coupled to a toxicokinetic-toxicodynamic model, the threshold damage
model (TDM), to assess recovery times for 4 aquatic organisms, after
insecticide application, in a nonseasonal environment and in 3 spatial
settings (pond, stream, and ditch). The species had different life
histories (e. g., voltinism, reproductive capacity, mobility). Exposure
was derived from a pesticide fate model, following standard European
Union scenarios. The results of the IBM-TDM were compared with results
from simpler models: one in which exposure was linked to effects by
means of concentration-effect relationships (IBM-CE) and one in which
the IBM was replaced by a nonspatial, logistic growth model (logistic).
For the first, exposure was based on peak concentrations only; for the
second, exposure was spatially averaged as well. By using comparisons
between models of different complexity and species with different life
histories, the authors obtained an understanding of the role spatial
processes play in recovery and the conditions under which the full
time-varying exposure needs to be considered. The logistic model, which
is amenable to an analytic approach, provided additional insights into
the sensitivity of recovery times to density dependence and spatial
dimensions. (C) 2014 SETAC
Tags
Individual-based model
Dynamics
ecosystems
Pesticides
Chemicals
Ecological risk-assessment
Competition delays recovery
Potential application
Gammarus-pulex
Chlorpyrifos