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

Carlsson, Bengt Göran

doi:10.1007/bf00164381

Cited by 13 publications

(9 citation statements)

References 50 publications

(56 reference statements)

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“…Székely 1996;Pilastro et al 2001;Owens 2002;Webb et al 2002;Wiebe 2005;Kokko & Rankin 2006). While female Tengmalm's owls must desert to remate (sequential polyandry), males may remate without deserting their first brood (simultaneous polygamy; Carlsson et al 1987;Carlsson 1991;Korpimäki 1991Korpimäki , 1992. We suggest that the differences between the sexes, not only in the availability of potential partners but also in the type of polygamy exhibited (i.e.…”

Section: Discussionmentioning

confidence: 83%

“…In years of high microtine rodent population densities, 10-20 per cent of the males are simultaneously polygynous (i.e. they remate within the same breeding season without deserting their first brood), but 20-25 per cent remain unpaired even if they possess a territory and nest cavity (Carlsson et al 1987;Carlsson 1991;Korpimäki 1991;Hakkarainen & Korpimäki 1998).…”

Section: Introductionmentioning

confidence: 99%

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Female offspring desertion and male-only care increase with natural and experimental increase in food abundance

Eldegard

Sonerud

2009

Proc. R. Soc. B.

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In species with biparental care, one parent may escape the costs of parental care by deserting and leaving the partner to care for the offspring alone. A number of theoretical papers have suggested a link between uniparental offspring desertion and ecological factors, but empirical evidence is scarce. We investigated the relationship between uniparental desertion and food abundance in a natural population of Tengmalm's owl Aegolius funereus, both by means of a 5-year observational study and a 1-year experimental study. Parents and offspring were fitted with radio-transmitters in order to reveal the parental care strategy (i.e. care or desert) of individual parents, and to keep track of the broods post-fledging. We found that 70 per cent of the females from non-experimental nests deserted, while their partner continued to care for their joint offspring alone. Desertion rate was positively related to natural prey population densities and body reserves of the male partner. In response to food supplementation, a larger proportion of the females deserted, and females deserted the offspring at an earlier age. Offspring survival during the post-fledging period tended to be lower in deserted than in non-deserted broods. We argue that the most important benefit of deserting may be remating (sequential polyandry).

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Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Female offspring desertion and male-only care increase with natural and experimental increase in food abundance

Eldegard

Sonerud

2009

Proc. R. Soc. B.

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“…At a similar latitude in Europe (Germany), singing begins around the first of January (Schelper 1989). In Sweden, Carlsson (1991) found individual males began singing on some suc-1 cessful territories over 2 months after the first males began singing. Late singers tended to be younger and may have immigrated into the area.…”

Section: Courtshipmentioning

confidence: 99%

“…In two good vole years, bigynous males reared an average of 7.8 and 9.5 fledglings compared to 4.2 and 5.1 for monogamous males. Males achieve polygamy through polyterritorial behavior, advertising at multiple (up to 5) cavities within the home range (Carlsson 1991). Primary and secondary females were separated by an average of 1,050 m (median, n = 17) (Korpimaki 1991).…”

Section: Mating System and Sex Ratiomentioning

confidence: 99%

“…In Europe, where longterm studies of population ecology are more common, sex ratio of breeding individuals was estimated as 8:10,0:10,5:10, and 4.3:10 (females to males) during 4 years in northern Sweden using autumn playback and mist-net trapping (Carlsson 1991). These estimates may be biased, however, by sexual differences in response to playback of primary song.…”

Section: Mating System and Sex Ratiomentioning

confidence: 99%

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Flammulated, boreal, and great gray owls in the United States: A technical conservation assessment

Hayward¹,

Verner²

1994

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Flammulated (Otus flammeolus), boreal (Aegolius funereus), and great gray (Strix nebulosa) owls occur over a broad portion of North America and each is designated as a "sensitive species" in four or more USDA Forest Service regons. The insectivorous flammulated owl is a neotropical migrant requiring suitable wintering habitat in the extreme southwestern United States, Mexico, and Central America as well as breeding habitat in the mountains of the western United States. Flammulated owls breed predominantly in yellow-pine (Pinus ponderosa and Pinus jefieyi) forests and are cavity nesters. The mature and older ponderosa pine forests used as breeding habitat by flammulated owls have changed during the past century due to fire management and timber harvest. In contrast, the boreal owl is a nomadic, small mammal specialist that occurs as an "island" species occupying subalpine and boreal forests. Movements among populations are probably important to boreal owl persistence, and coordinated management of disjunct populations in different Forest Service regions may be important. While the boreal owl's high altitude spruce-fir forests have remained relatively undisturbed in the past, they are coming under increasing harvest pressure as the stock of lower elevation older stands are depleted or reserved. Great gray owls in the western United States occur in mid to high elevation conifer forests. These owls usually nest in mature and older forest stands using existing raptor nests or tops of broken trees and snags for a nest platform. The species' requirement of a secure nesting platform leads to one potential ecological limitation on population size. Prey availability is the other factor thought to limit populations. Flammulated and boreal owls may face significant conservation problems in the absence of conservation planning. Both owls are associated with older forest habitats. Limited research on these species indicates that their demography and life history coupled with their fairly narrow habitat associations make them vulnerable to habitat change. Current forest management practices in many areas (i.e., stand replacement systems) remove quality habitat for these species. Therefore, on at least a local basis, persistence of these species could be in jeopardy, even in the short term. Long-term concerns are greater because the habitats that seem most important to these species require one to two centuries to regenerate. Furthermore, the population biology of both species necessitates across-region planning to facilitate effective conservation planning. Based on limited information, the persistence of great gray owl populations in the United States over both the short and long-term is more certain. Great gray owl foraging habitat use is more compatible with current forest management practices. Our understanding of the ecology and biology of these three species is not sufficient to produce a conclusive assessment of their conservation status. The enclosed assessments, however, give a sufficiently clear picture of ea...

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Experimental increase in food supply influences the outcome of within-family conflicts in Tengmalm’s owl

Eldegard

Sonerud

2010

Behav Ecol Sociobiol

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

Cited by 13 publications

References 50 publications

Female offspring desertion and male-only care increase with natural and experimental increase in food abundance

Female offspring desertion and male-only care increase with natural and experimental increase in food abundance

Flammulated, boreal, and great gray owls in the United States: A technical conservation assessment

Experimental increase in food supply influences the outcome of within-family conflicts in Tengmalm’s owl

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