Trigyny in Tengmalm's Owl Aegolius funereus Induced by Supplementary Feeding?

Carlsson, Bengt-Göran; Hörnfeldt, Birger

doi:10.2307/3676884

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…When a female deserts, its mate compensates for the absent female's contribution and continues to care for the nestlings (Korpimäki 1981;Zárybnická 2009a;Eldegard and Sonerud 2012) and fledglings until they become independent (6 to 7 weeks after fledging, Eldegard and Sonerud 2012). Males can be polygynous and simultaneously pair with two or even three females (Carlsson et al 1987;Carlsson and Hörnfeldt 1989;Korpimäki 1991). Although clutch sizes of primary and secondary/ tertiary females do not differ, the latter females produce significantly fewer and lighter fledglings than the primary or monogamous females or their nesting attempt may even fail due to the low food provision rate by males (Korpimäki 1991;Zárybnická, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Zárybnická

Vojar

2013

Zool. Stud.

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Background: Sex-specific parental roles of most raptors allow mates to cooperate during breeding; while females incubate and brood, males provide food. If one partner fails in its parental duties, however, sex-specific parental roles can limit the ability of each sex to carry out the role normally performed by its partner. We observed the effect of male food provisioning on female parental care in Boreal Owls Aegolius funereus using cameras at 12 nests in western Finland in 2005. We compared the parental care of eight females in nests with a high male feeding rate (successful nests) with that of the females in four nests with a low or zero male feeding rate (failed nests).

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Section: Introductionmentioning

confidence: 99%

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Zárybnická

Vojar

2013

Zool. Stud.

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Recruitment of mates and deceptive behavior by male Tengmalm's owls

Carlsson

1991

Behav Ecol Sociobiol

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Effects of cyclic food supply on breeding performance in Tengmalm's owl (Aegolius funereus)

Hörnfeldt¹,

Carlsson²,

Löfgren³

et al. 1990

Can. J. Zool.

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Cyclic populations of bank voles (Clethrionomys glareolus), grey-sided voles (Clethrionomys rufocanus), and field voles (Microtus agrestis) made up > 90% of the diet of Tengmalm's owl (Aegolius funereus) in northern Sweden during the breeding seasons of 1980–1986. These voles also made up > 90% of snap-trapped small mammals in the study area. Comparisons of the species composition in the diet during laying with that of animals trapped indicated that bank voles were usually taken approximately in proportion to their relative abundance, whereas field voles were frequently taken more and grey-sided voles less than expected from their relative abundance. However, bank voles predominated in the diet during laying early in the season (snow depth > 40 cm). Later in the season (snow depth ≤ 40 cm) the porportion of field voles and grey-sided voles increased during laying, suggesting increased availability of these species as the snow melted. Breeding density (percentage of nest boxes with ≥ 1 egg) showed a positive correlation whereas laying date showed a negative correlation with food supply in autumn. In contrast, clutch size, number of fledglings per successful nest, and an index of the annual production of fledglings showed positive correlations with food supply in spring. Clutch size declined with season but at different levels in different years, and laying date per se only explained 11% of clutch size variation among years. In contrast, the "year effect" (related to food supply) explained 29% of the variation in clutch size. Clutches were even larger at later laying dates (when, however, the food supply was better) in 1984 than in 1985. Nest survival and survival per egg (until fledging) in successful nests varied over the years, but did not covary with the cyclic food supply. However, the lowest nest survival was found in a year when voles declined dramatically over winter. Egg size did not show any variation among years.

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Trigyny in Tengmalm's Owl Aegolius funereus Induced by Supplementary Feeding?

Cited by 4 publications

References 5 publications

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Effect of male provisioning on the parental behavior of female Boreal Owls Aegolius funereus

Recruitment of mates and deceptive behavior by male Tengmalm's owls

Effects of cyclic food supply on breeding performance in Tengmalm's owl (Aegolius funereus)

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