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Medientyp:
E-Artikel
Titel:
Nests, Territories, and Reproduction of Sedge Wrens (Cistothorus platensis)
Beteiligte:
Burns, Jeffrey T.
Erschienen:
Wilson Ornithological Society, 1982
Erschienen in:
The Wilson Bulletin, 94 (1982) 3, Seite 338-349
Sprache:
Englisch
ISSN:
0043-5643
Entstehung:
Anmerkungen:
Beschreibung:
Twelve male Sedge Wrens (Cistothorus platensis) defended all-purpose territories averaging 1780 m2, building an estimated average of nine nests each. Three of the males were polygynous. The mates of six monogamous males renested after successfully fledging young. Because of second nesting attempts, monogamous females averaged the highest fledgling success (5.8 young), followed by primary (5.3 young) and secondary (3.3 young) females. A seasonal decrease in clutch-size of monogamous females (from 7.0-5.7), combined with within season arrivals and departures of females confounds the analysis of reproductive success. Little difference was found between the success of different classes of females nesting at the same time. Polygynous males nonetheless achieved a higher mean reproductive success than did monogamous males, largely due to higher rates of predation on the late nests of monogamous males.