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Pairing Chronology and Agonistic Behaviors of Wintering Green-Winged Teal and Mallards
William P. Johnson and Frank C. Rohwer
The Wilson Bulletin
Vol. 110, No. 3 (Sep., 1998), pp. 311-315
Published by: Wilson Ornithological Society
Stable URL: http://www.jstor.org/stable/4163954
Page Count: 5
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We examined pairing chronology and aggressive interactions of Green-winged Teal (Anas crecca) and Mallards (A. platyrhynchos) wintering in coastal Louisiana from October 1994 through March 1995. Many Mallards were apparently paired upon their arrival to coastal Louisiana in early November, as 11 of the first 20 females observed were paired. Most (≥90%) female Mallards were paired by mid-December. Green-winged Teal were first observed pairing in January and 81% of females observed during March were paired. For both Green-winged Teal (P < 0.01) and Mallards (P < 0.01) intraspecific aggressive conflicts were primarily won by individuals initiating encounters. Paired Green-winged Teal (P < 0.05) and paired Mallards (P < 0.05) typically won conflicts with unpaired conspecifics. In agonistic encounters between unpaired male and unpaired female Green-winged Teal, neither sex was dominant (P > 0.05). The frequency of aggressive interactions by paired and unpaired Green-winged Teal was similar (P > 0.05); in contrast, paired Mallards were less likely to participate in aggressive interactions than were unpaired Mallards (P < 0.01). Effects of pairing on aggressive interactions do not appear to be the same for Green-winged Teal and Mallards.
The Wilson Bulletin © 1998 Wilson Ornithological Society