Rheoreaction impacts dispersal of fish larvae in restored rivers
| Autor: | Hubert Keckeis, Helmut Habersack, Michael Tritthart, Marcel Liedermann, Aaron Lechner, Martin Glas |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Release site active‐passive Field experiment 0208 environmental biotechnology movement pattern 02 engineering and technology Fish larvae 01 natural sciences settlement Environmental Chemistry trajectories Research Articles General Environmental Science Water Science and Technology Larva biology 010604 marine biology & hydrobiology Chondrostoma biology.organism_classification Life stage 020801 environmental engineering behaviour Fishery Habitat hydrodynamics Biological dispersal Research Article |
| Zdroj: | River Research and Applications |
| ISSN: | 1535-1467 1535-1459 |
| Popis: | Connectivity of nurseries and spawning habitats for young of the year life stage is essential for successful recruitment of fish populations and therefore provides a key indicator for river restoration measures. Models for dispersal offer the potential to draw conclusions regarding restoration scenarios and to fill knowledge gaps about possible implications for fish populations. A newly developed rheoreaction‐based correlated random walk model (RCRW), in combination with a three‐dimensional numerical model and a non‐steady‐state particle tracing model, was applied for nase carp larvae (Chondrostoma nasus) before and after a restoration project on the river Danube, Austria. Spatio‐temporal patterns of dispersal of virtual larvae, attached with rheoreactive behaviour, were analysed within both scenarios. In comparison to the heavily modified river reach, the restored reach enabled a greater amount of upstream movement from the release site and showed a generally higher variability of spatio‐temporal distribution patterns. In contrast, estimated total settlement of rheoreactive larvae was substantially higher for the situation prior to the restoration measure. By comparing model results with a previously field experiment it was found that model simulations including rheoreaction as a single behaviour for navigation could not explain the whole pattern of larval dispersal. Therefore it is highly recommended for future studies to develop larval dispersal models by considering other factors (i.e., behaviour, bio‐energetics and environmental factors) of existing and future individual‐based models, which could serve as a tool to analyse the effect of restoration measures for recruitment of riverine fish populations. |
| Databáze: | OpenAIRE |
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