Incestuous breeding in the Mute Swan<i>Cygnus olor</i>

Coleman, Jonathan T.; Coleman, A E; Elphick, David

doi:10.1080/03078698.1994.9674086

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Brood size at hatching was 4.9 for the two years combined, slightly higher than found in Europe (for example, 4.5 for 13 years in Staffordshire, England; Coleman and Minton 1980). The number of cygnets fledged per breeding pair for the two seasons combined at Long Point was 3.1, comparable to rapidly expanding populations reported in Europe; values of 3.1 were determined in an increasing population in Denmark and 3.2 for a population in Latvia (in Eltringham 1966).…”

Section: Discussionmentioning

confidence: 60%

Population status and reproductive biology of the Mute Swan, Cygnus olor, at Long Point, Lake Erie, Ontario

Knapton

1993

The Canadian Field-Naturalist

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During 1991 -1992, a study of the population status and breeding biology of the Mute Swan, Cygnus olor, was carried out at Long Point, Lake Erie. Thirty-one pairs with broods were located, 9 in 1991, 22 in 1992. Brood size ranged from 2 to 10, with 4 and 5 being the most frequent. Brood size averaged 4.9 at hatching and 3.1 at fledging, a value which compares with that of rapidly expanding populations in Europe. Aerial surveys in fall at Long Point revealed a peak total of 148 in 1991 and 172 in 1992, an increase of 14 %. A high proportion of "Polish" morph juveniles were detected.

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Section: Discussionmentioning

confidence: 60%

Population status and reproductive biology of the Mute Swan, Cygnus olor, at Long Point, Lake Erie, Ontario

Knapton

1993

The Canadian Field-Naturalist

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“…Nestler & Nelson 1945, Greenwood et al 1978, Shaw & Dowell 1989. Several cases of incestuous breeding have been documented in Mute Swan Cygnus olor (Coleman et al 1994(Coleman et al , 2001, but only very few in Whooper Swan Cygnus cygnus (Dudzik et al 2010).Two incestuous broods of a sibling pair of Whooper Swan were recorded in Poland in 2010 and 2011. On 15 May 2010 a female on the nest with the male in the neighbourhood were found in the Chycza ponds (50°42'28.37"N, 20°5'46.69"E), about 45 km south-west of Kielce.…”

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confidence: 99%

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confidence: 99%

Incestuous broods of the Whooper Swan Cygnus cygnus in Poland

Dudzik¹,

Ciach²,

Jankowiak³

et al. 2012

Ornis Svec

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We describe a rare case of incestuous broods of Whooper Swan Cygnus cygnus in Świętokrzyskie province, Poland. A sibling pair laid eggs and hatched young at the same site in 2010 and in 2011, nine kilometres from their own hatching place. Both broods were unsuccessful; the young died before autumn. We assume that the key factors explaining the inbreeding were the small local population and that Whooper Swans tend to disperse over short distances.

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