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Titolo:
NEST ATTENDANCE BY MALE CALIFORNIA GNATCATCHERS
Autore:
SOCKMAN KW;
Indirizzi:
WASHINGTON STATE UNIV,DEPT ZOOL PULLMAN WA 99164 SAN DIEGO STATE UNIV,DEPT BIOL SAN DIEGO CA 92182
Titolo Testata:
Journal of field ornithology
fascicolo: 1, volume: 69, anno: 1998,
pagine: 95 - 102
SICI:
0273-8570(1998)69:1<95:NABMCG>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARENTAL-CARE; MALE INCUBATION; FEMALE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
K.W. Sockman, "NEST ATTENDANCE BY MALE CALIFORNIA GNATCATCHERS", Journal of field ornithology, 69(1), 1998, pp. 95-102

Abstract

Changes in paternal relative to maternal care either seasonally or ol-er the nest cycle may reflect conflicting reproductive strategies between the sexes or may enhance reproductive success in the presence of sex-specific, physiological constraints. To determine whether nest attendance by males relative to females changed seasonally or with stage of the nest cycle, 107 nests of the California Gnatcatcher (Polioptilacalifornica) were monitored over the 1994 and 1995 breeding seasons, and the sex of the attending adult was noted during each visit. Relative nest attendance by the male (RNRM) was calculated by dividing the frequency of the male observed on the nest by the number of times either adult was seen on the nest. Although variability in RNAM was high, RNAM showed a decline from approximately 0.5 for first nests of the season to approximately 0.3 for late-season nests. RNAM was less during the nestling stage than during incubation or laying. During the nestling period, RNAM was less than relative nest attendance by the female, whereas prior to hatching, attendance patterns did not differ between the sexes. Because the cause of RNAM variation is unknown, future studies should aim at determining the whereabouts of gnat-catchers while off the nest.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 07:03:09