期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 842, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156680
关键词
Dispersal; Invertebrate drift; Biodegradable tracer; Mass transfer
资金
- Canadian Freshwater Species at Risk Research Network (SARNET)
- Species at Risk Program from Fisheries and Oceans Canada
- Natural Sciences and Engineering Research Council of Canada (NSERC)
This article introduces a biodegradable and non-toxic physical model for studying the dispersal of particulate matter. The study shows that alginate microbeads are a viable tool for dispersal studies, as their environmentally friendly and customizable properties offer improvements over non-biodegradable alternatives.
The transport of particulate matter including the gametes, larvae and propagules of reproducing organisms and other organic matter involved in nutrient/contaminant transport are important processes, yet there are few environmentally friendly methods available to examine dispersal empirically. Herein we report on the development and application of a biodegradable and non-toxic physical model, based on alginate microbeads with modifiable size, density (rho), and colour for use in dispersal studies. Specifically, the microbeads were designed to model the size and rho of parasitic juvenile freshwater mussels (Unionidae; rho = 1200 kg m(-3)), which undergo dispersal upon excystment from fish hosts. We released the juvenile-mussel and neutrally buoyant microbeads (rho = 1000 kg m(-3)) in a local river and captured them in drift nets downstream. The concentration of microbeads declined with downstream distance, but neutrally buoyant microbeads were transported farther. Analysis of microbead capture rates could be described using the patterns of several mathematical models (negative exponential, power, and turbulent transport), which were consistent with the reported dispersal of mussel larvae and other benthic macroinvertebrates. These results support the use of alginate microbeads in dispersal studies, because their environmentally friendly and customizable properties offer improvements over non-biodegradable alternatives.
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