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Titolo:
EFFECT OF CLUTCH SIZE ON INCUBATION PERSISTENCE IN MALE WILSON PHALAROPES (PHALAROPUS-TRICOLOR)
Autore:
DELEHANTY DJ; ORING LW;
Indirizzi:
UNIV NEVADA,ECOL EVOLUT & CONSERVAT BIOL PROGRAM,ERS 1000 VALLEY RD RENO NV 89512 UNIV N DAKOTA,DEPT BIOL GRAND FORKS ND 58202
Titolo Testata:
The Auk
fascicolo: 3, volume: 110, anno: 1993,
pagine: 521 - 528
SICI:
0004-8038(1993)110:3<521:EOCSOI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYANDROUS SPOTTED SANDPIPER; SOUTHCENTRAL SASKATCHEWAN; PROLACTIN; SHOREBIRD; BIRDS; BEHAVIOR; TABLES; CARE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Delehanty e L.W. Oring, "EFFECT OF CLUTCH SIZE ON INCUBATION PERSISTENCE IN MALE WILSON PHALAROPES (PHALAROPUS-TRICOLOR)", The Auk, 110(3), 1993, pp. 521-528

Abstract

The effect of clutch size on incubation persistence of male Wilson's Phalaropes (Phalaropus tricolor) was studied over two breeding seasonsin south-central Saskatchewan. The Wilson's Phalarope is a ''sex-role-reversed'' shorebird in which only males incubate and provide parental care. The breeding season is long enough to allow for renesting but not for the rearing of more than one brood per male. Barring secondarymating strategies, the total annual reproduction of a male is limitedby the size of its clutch. Females lay determinate clutches of four eggs. By determining the minimum clutch size necessary for male incubation persistence, we demonstrated that males alter their reproductive effort in response to clutch size, and we identified the minimum potential annual reproduction for males necessary to maintain this unusual mating system. Clutch-size reductions led to an increased frequency of abandonment inversely proportional to the number of eggs remaining in the clutch. The timing of egg loss also was critical. Among males withclutches reduced to one egg or reduced to two eggs early in the incubation cycle, all but one abandoned incubation. Among males with clutches reduced to two eggs late in incubation or three eggs early, an intermediate proportion abandoned incubation. All but one male with three eggs late in incubation or a full, four-egg clutch continued to incubate. Experimentally increasing clutch sizes by two eggs over the normalfour-egg clutch led to rapid nest failure. This suggests that the determinate, four-egg clutch of females is not suboptimal for males and that nest parasitism of two eggs by females has little potential benefit as an alternative reproductive tactic.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:29:45