Populationsgenetik und Vaterschaftsanalyse beim Eleonorenfalken (Falco eleonorae)

Swatschek, I.; Ristow, Dietrich; Scharlau, W.; Wink, Coralie; Wink, Michaël

doi:10.1007/bf01640082

Cited by 27 publications

(13 citation statements)

References 7 publications

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“…Lesser Kestrels (Falco naumanni) and Eleonora's Falcons (Falco eleonorae) both nest in dense colonies. Thus the availability of potential mates is high, but low rates of EPFs were found (0 % for the Eleonora's Falcon, Swatschek et al 1993;3.4 % for the Lesser Kestrel, Negro et al 1996). Furthermore, the 3.4 % EPFs found in Lesser Kestrels, are most likely attributable to rapid mate replacement (Negro et al 1996).…”

Section: Discussionmentioning

confidence: 98%

Genetic paternity analyses in Little Owls (Athene noctua): does the high rate of paternal care select against extra-pair young?

2001

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Previous studies have shown that extra-pair fertilizations are much less frequent in Non-Passeriformes, especially in raptors, than in Passeriformes. Low breeding densities, high breeding synchrony and high rates of paternal effort have been discussed as possible causes of these low extra-pair fertilization rates. Using DNA fingerprinting, we studied the mating system of Little Owls (Athene noctua) in a population of relatively high breeding density and comparatively low breeding synchrony. We found no cases of extra-pair fertilization among 53 nestlings of 16 breeding pairs. We conclude that paternal effort is probably the most important factor in preventing extra-pair fertilizations in Little Owls. ZusammenfassungGenetische Vaterschaftsanalysen bei Steinkäuzen (Athene noctua): Beeinflußt der hohe elterliche Aufwand der Männchen das Auftreten von Vaterschaften außerhalb des Paarbundes? Zahlreiche Untersuchungen haben gezeigt, dass Befruchtungen außerhalb des Paarbundes bei Nicht-Singvogelarten wesentlich seltener vorkommen als bei Singvögeln. Dies gilt insbesondere auch für Greifvögel. Als Ursache für das seltene Auftreten von Befruchtungen außerhalb des Paarbundes in dieser Gruppe werden niedrige Brutpaardichten, eine hohe Brutsynchronisation und ein hoher elterlicher Aufwand auf Seiten der Männchen diskutiert. In der vorliegenden Studie haben wir das Paarungssystem des Steinkauzes (Athene noctua) in einer Population im Kreis Viersen (Niederrhein) mit Hilfe des DNA-Fingerprinting untersucht. Diese Population wies eine relativ hohe Brutpaardichte und eine vergleichsweise niedrige Brutsynchronisation auf. Bei der Analyse von 16 Bruten, die insgesamt 53 Nestlinge enthielten, konnte kein einziger Fall einer Befruchtung außerhalb des Paarbundes nachgewiesen werden. Dies führt uns zu dem Schluss, dass der wichtigste Faktor für die genetische Monogamie -zumindest beim Steinkauz -das hohe Maß des väterlichen Aufwandes bei der Brutversorgung ist.

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Section: Discussionmentioning

confidence: 98%

Genetic paternity analyses in Little Owls (Athene noctua): does the high rate of paternal care select against extra-pair young?

2001

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“…Experimental studies are now required to investigate these two alternative scenarios. Faaborg et al (1995), (C) Parkin in Birkhead and Møller (1992), (D) Swatschek et al (1993), (E) Warkentin et al (1994), (F) Negro et al (1996), (G) Korpimäki et al (1996)…”

Section: Discussionmentioning

confidence: 99%

Extra‐pair paternity, testes size and testosterone level in relation to colour polymorphism in the barn owlTyto alba

Roulin¹,

Mueller²,

Sasvári³

et al. 2004

Journal of Avian Biology

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Extra-pair paternity, testes size and testosterone level in relation to colour polymorphism in the barn owl Tyto alba Roulin, A; Mueller, Wendt; Sasvari, L; Dijkstra, C; Ducrest, AL; Riols, C; Wink, M; Lubjuhn, T Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. In many bird populations, individuals display one of several genetically inherited colour morphs. Colour polymorphism can be maintained by several mechanisms one of which being frequency-dependent selection with colour morphs signalling alternative mating strategies. One morph may be dominant and territorial, and another one adopt a sneaky behaviour to gain access to fertile females. We tested this hypothesis in the barn owl Tyto alba in which coloration varies from reddish-brown to white. This trait is heritable and neither sensitive to the environment in which individuals live nor to body condition. In Switzerland, reddish-brown males were observed to feed their brood at a higher rate and to produce more offspring than white males. This observation lead us to hypothesize that white males may equalise fitness by investing more effort in extrapair copulations. This hypothesis predicts that lighter coloured males produce more extra-pair young, have larger testes and higher levels of circulating testosterone. However, our results are not consistent with these three predictions. First, paternity analyses of 54 broods with a total of 211 offspring revealed that only one young was not sired by the male that was feeding it. Second, testes size was not correlated with male plumage coloration suggesting that white males are not sexually more active. Finally, in nestlings at the time of feather growth testosterone level was not related to plumage coloration suggesting that this androgen is not required for the expression of this plumage trait. Our study therefore indicates that in the barn owl colour polymorphism plays no role in the probability of producing extra-pair young.A. Roulin (correspondence),

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“…We stored 10 drops of blood in ethanol on ice in 1.5-mL Eppendorf tubes. Following the protocols of Sambrook et al (1989) and Swatschek et al (1993Swatschek et al ( , 1994, we performed DNA isolation, including digestion by restriction enzymes (Hinf I), agarose electrophoresis, and capillary transfer to a nylon membrane (Biodyne B; Pall GmbH, Dreieich, Germany). After prehybridization, we incubated nylon membranes in a hybridization mixture containing 10 pmol/mL of digoxigenated oligonucleotide probe (GGAT) 4 (Fresenius AD, Bad Honburg, Germany) to detect minisatellites.…”

Section: Marking Combinations South North Total Trappedmentioning

confidence: 99%

Rapid Sustainability Modeling for Raptors by Radiotagging and DNA‐Fingerprinting

Kenward

Katzner²,

Marcström

et al. 2007

J Wildl Manag

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Sustainable use of wildlife is crucial to ensuring persistence of natural resources. We used age‐specific survival and breeding data to parameterize a demographic model for a harvested Kazakh saker falcon (Falco cherrug) population by radiotagging juveniles and estimating adult turnover with DNA‐fingerprinting during 1993–1997. We gathered similar data during 1990–1998 to model populations of British buzzards (Buteo buteo), and during 1980–1998 to model populations of Swedish goshawks (Accipiter gentilis). Leg‐bands and implanted microtransponders provided ways to test for bias and to estimate the harvest of sakers for falconry. Despite an estimated minimum first‐year survival of only 23%, the observed productivity of 3.14 young per clutch would sustain a saker population (i.e., λ = 1) with a breeding rate (at laying) of only 0.63 for adults or with a residual juvenile yield of 37% if all adults breed. Higher first‐year survival rates for goshawks and buzzards correlated with juvenile yields of up to 71%, but no more than half as many individuals if adults also were harvested. An annual population decline of 40% for sakers in southern Kazakhstan could be explained by observed productivity of only 0.71 young per clutch if there was also an estimated harvest of 55% of adults. This study shows that demographic models such as these can now be built rapidly if nestlings are fitted with reliable and safe radiotags and adult turnover is estimated from genetic analyses or other techniques.

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Populationsgenetik und Vaterschaftsanalyse beim Eleonorenfalken (Falco eleonorae)

Cited by 27 publications

References 7 publications

Genetic paternity analyses in Little Owls (Athene noctua): does the high rate of paternal care select against extra-pair young?

Genetic paternity analyses in Little Owls (Athene noctua): does the high rate of paternal care select against extra-pair young?

Extra‐pair paternity, testes size and testosterone level in relation to colour polymorphism in the barn owlTyto alba

Rapid Sustainability Modeling for Raptors by Radiotagging and DNA‐Fingerprinting

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