Wetland selection by American green-winged teal breeding in British Columbia

Paquette, G.A.; Ankney, C.D.vison

Condor 98(1): 27-33

1996


ISSN/ISBN: 0010-5422
DOI: 10.2307/1369504
Accession: 009733177

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Abstract
We examined wetland selection by breeding Green-winged Teat (Anas crecca carolinensis) in terms of wetland fertility near Riske Creek, British Columbia, Canada. We conducted 12 breeding-pair surveys to classify use of 96 wetlands. We evaluated wetland fertility by analyzing water chemistry (pH, conductivity, alkalinity (CaCO-3), total phosphorus, chlorophyll a) and physical characteristics (percent emergent cover, area of wetland 0-1 m depth, wetland size). There was significant variation in chemical and physical variables between unused (n = 47) and used (n = 49) wetlands (MANOVA, Wilks' lambda = 0.8054, P = 0.0126). On average, water chemistry measurements, total area (m-2) and area 0-1 m (m-2) depth were greater in used wetlands, whereas percent cover was lower. Also, there was significant variation in chemical and physical variables between unused (n = 47), infrequently used (n = 26), and frequently used (n = 23) wetlands (MANOVA, Wilks' lambda = 0.6951, P = 0.0085). On average, water chemistry measurements, total area (m-2) and area 0-1 m (m-2) were positively correlated with wetland use, whereas percent cover was negatively correlated. We conclude that wetland fertility is an important factor influencing landscape and geographic distribution of breeding Green-winged Teal.