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Titolo:
A breeding population of Virginia's warblers in the southwestern Black Hills of South Dakota
Autore:
Swanson, DL; Palmer, JS; Liknes, ET; Dean, KL;
Indirizzi:
Univ S Dakota, Dept Biol, Vermillion, SD 57069 USA Univ S Dakota Vermillion SD USA 57069 Dept Biol, Vermillion, SD 57069 USA
Titolo Testata:
SOUTHWESTERN NATURALIST
fascicolo: 1, volume: 45, anno: 2000,
pagine: 39 - 44
SICI:
0038-4909(200003)45:1<39:ABPOVW>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSECT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Swanson, DL Univ S Dakota, Dept Biol, Vermillion, SD 57069 USA Univ S Dakota Vermillion SD USA 57069 ermillion, SD 57069 USA
Citazione:
D.L. Swanson et al., "A breeding population of Virginia's warblers in the southwestern Black Hills of South Dakota", SW NATURAL, 45(1), 2000, pp. 39-44

Abstract

We report a breeding population of Virginia's warblers (Vermivora virginiae) from Custer Co., South Dakota in the southwestern Black Hills. The habitat in which these warblers occurred consisted of a shrubby understory of skunkbush sumac (Rhus aromatica) and mountain-mahogany (Cercocarpus montanus)with interspersed or adjacent Rocky Mountain juniper (Juniperus scopulorum) and ponderosa pine (Pinus ponderosa). We used fixed-width line transect censuses and mist net sampling during the breeding season (25 May-9 July 1998) to determine abundance and breeding condition of Virginia's warblers in this habitat. Censuses yielded a raw density estimate of 8.3 birds per km(2) and a relative abundance (birds per kilometer-long transect) of 1.5 birds/transect. Male warblers captured by mist net (n = 22) had well developed cloacal protuberances and females (n = 5) had well developed brood patches or eggs within the reproductive tract; these features strongly suggested breeding. In addition, we found an active nest with four nestlings on 3 July, thus definitely documenting breeding for Virginia's warbler in South Dakota. This population represents the northeasternmost known breeding populationof Virginia's warblers and extends the known breeding range of this species by over 200 km.

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Documento generato il 06/04/20 alle ore 01:22:34