The effect of beaver facilitation on Common Teal : pairs and broods respond differently at the patch and landscape scales

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http://hdl.handle.net/10138/302629

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Nummi , P , Suontakanen , E-M , Holopainen , S & Väänänen , V-M 2019 , ' The effect of beaver facilitation on Common Teal : pairs and broods respond differently at the patch and landscape scales ' , Ibis , vol. 161 , no. 2 , pp. 301-309 . https://doi.org/10.1111/ibi.12626

Title: The effect of beaver facilitation on Common Teal : pairs and broods respond differently at the patch and landscape scales
Author: Nummi, Petri; Suontakanen, Eeva-Maria; Holopainen, Sari; Väänänen, Veli-Matti
Contributor: University of Helsinki, Wetland Ecology Group
University of Helsinki, Wetland Ecology Group
University of Helsinki, Wetland Ecology Group
Date: 2019-04
Language: eng
Number of pages: 9
Belongs to series: Ibis
ISSN: 0019-1019
URI: http://hdl.handle.net/10138/302629
Abstract: Avian species respond to ecological variability at a range of spatial scales and according to life history stage. Beaver dams create wetland systems for waterbirds that are utilized throughout different stages of the breeding season. We studied how beaver?induced variability affected mobile pairs and more sedentary broods along with the production of Common Teal Anas crecca at the patch and landscape scale on their breeding grounds. Beavers Castor spp. are ecosystem engineers that enhance waterfowl habitats by impeding water flow and creating temporary flooding. Two landscapes in southern Finland with (Evo) and without (Nuuksio) American Beavers Castor canadensis were used in this study. To investigate the patch?scale effect, pair and brood densities along with brood production were first compared at beaver?occupied lakes and non?beaver lakes in the beaver landscape. Annual pair and brood densities/km shoreline and brood production were compared between beaver and non?beaver landscapes. Facilitative effects of beaver activity were manifest on brood density at both patch and landscape scales: these were over 90 and 60 percent higher in beaver patches and landscapes, respectively. An effect of beaver presence on pair density was only seen at the landscape level. Pair density did not strongly affect brood production, as shown earlier for relatively mildly density?dependent Teal populations. Because the extent of beaver flooding was a crucial factor affecting annual Teal production in the study area, we infer beaver activity has consequences for the local Teal population. Ecosystem engineering by the beaver could therefore be considered as a restoration tool in areas where waterfowl are in need of high?quality habitats. This article is protected by copyright. All rights reserved.
Subject: 1181 Ecology, evolutionary biology
Anas crecca
brood production
Castor canadensis
ecosystem engineer
experienced scale
Teal density
wetland management
BIODIVERSITY
POPULATION
LAKES
ECOSYSTEM ENGINEER
DENSITY-DEPENDENCE
HABITAT USE
CASTOR-CANADENSIS
INVERTEBRATES
DUCKS
FOOD
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