An individual-based approach to model spatial population dynamics of invertebrates in aquatic ecosystems after pesticide contamination
Authored by den Brink Paul J Van, J M (Hans) Baveco, Jana Verboom, Fred Heimbach
Date Published: 2007
DOI: 10.1897/07-022r.1
Sponsors:
No sponsors listed
Platforms:
Smalltalk
Model Documentation:
Other Narrative
Flow charts
Mathematical description
Model Code URLs:
Model code not found
Abstract
In the present study we present a population model (Metapopulation model
for Assessing Spatial and Temporal Effects of Pesticides {[}MASTEP])
describing the effects on and recovery of the waterlouse Asellus
aquaticus after exposure to a fast-acting, nonpersistent insecticide as
a result of spray drift in pond, ditch, and stream scenarios. The model
used the spatial and temporal distribution of the exposure in different
treatment conditions as an input parameter, A dose-response relation
derived from a hypothetical mesocosm study was used to link the exposure
with the effects. The modeled landscape was represented is a lattice of
1- by 1-m cells. The model included processes of mortality of A.
aquaticus, life history, random walk between cells, density dependence
of population regulation, and, in the case of the stream scenario, medium-distance drift of A. aquesticus due to flow. All parameter
estimates were based on expert judgment and the results of a thorough
review of published information on the ecology of A, aquaticus. In the
treated part of the water body, the ditch scenario proved to be the
worst-case situation, due to the absence of drift of A. aquaticus.
Effects in the pond scenario were smaller because the pond was exposed
from one side, allowing migration from the other, less contaminated
side. The results of the stream scenario showed the importance of
including drift for the population recovery in the 100-m stretch of the
stream that was treated. It should be noted, however, that the inclusion
of drift had a negligible impact on numbers in the stream as a whole
(600 m).
Tags
Water
growth
Life-history
Crustacea
Stream
Lake
Isopod asellus-aquaticus