Utilisation des bassins de rétention d'eaux pluviales dans les emprises routières par les amphibiens

Authors: Milliard, Laura
Advisor: Mazerolle, Marc J.Imbeau, Louis
Abstract: Wetland restoration and creation are strategies considered to compensate for the loss of natural wetlands. In this context, the creation of stormwater retention ponds (hereafter, stormwater ponds) during road construction is a potential method of compensation. The objective of our project was to quantify the use of roadside stormwater ponds by amphibians. Roadside stormwater ponds allow for the storage of rainfall and run off. These waters are loaded with pollutants, such as road salts. We hypothesized that amphibian use of natural wetlands is greater than in roadside wetlands, and that at equal distances from the road, amphibians are more likely to use natural wetlands than stormwater ponds. We assessed adult presence using anuran call surveys and reproductive success using egg masses and tadpole counts. These surveys were conducted in 20 roadside stormwater ponds, 20 natural roadside wetlands (< 50 m), and 20 wetlands far from roads (50 m - 500 m). We evaluated site quality based on local characteristics such as pond size, vegetation, water physicochemical properties, hydroperiod, as well as landscape-scale variables. Our results revealed that conductivity and pH were substantially higher in ponds than in natural wetlands. Occupancy of adults and tadpoles did not vary with the pond and landscape-scale variables we considered. However, the abundance of mole salamander egg masses decreased with in creasing water conductivity and pond hydroperiod. Despite certain characteristics that differentiate them from natural environments, roadside stormwater ponds provide breeding and larval development habitat to several amphibian species. However, decreasing de-icing salt applications will increase the quality of stormwater ponds for amphibian communities.
Document Type: Mémoire de maîtrise
Issue Date: 2022
Open Access Date: 20 June 2022
Permalink: http://hdl.handle.net/20.500.11794/73611
Grantor: Université Laval
Collection:Thèses et mémoires

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