Research School for Socio-Economic and
Natural Sciences of the Environment
Research School for Socio-Economic and
Natural Sciences of the Environment

Judith Westveer

Date: 04 December 2018
Time: 14:00 - 15:30
Location: Agnietenkapel, Oudezijds Voorburgwal 229-231, Amsterdam

Dissertation title: 

Go with the Flow - Unravelling the ecological mechanisms of dispersal and colonization by aquatic macroinvertebrates in restored lowland streams

Group: University of Amsterdam, Aquatic Ecology and Ecotoxicology
Promotor: P.F.M. Verdonschot


Stream restoration efforts do not always pay off, since populations of aquatic macroinvertebrates do not recover as quickly as anticipated. Until now, it remains mostly unclear why these restored streams are not recolonized by a diverse group of macroinvertebrates.

To optimize restoration schemes it is important to know how aquatic macroinvertebrates can disperse from a source pool to a new habitat. A subsequent step in successful stream restoration is for the newly arrived macroinvertebrates to be able to colonize the habitat, survive and reproduce. Which conditions are favorable for their settlement? In this thesis I explore the ecological mechanisms behind the dispersal and subsequent colonization of aquatic macroinvertebrates in restored lowland streams. My overall finding is that the obstacle of specific dispersal limitations decreases when shifting from large scale catchment processes to small scale habitat processes. Meanwhile, environmental limitations become increasingly more important at smaller scales.

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