NDLI: Spatio-temporal variation in nestling sex ratio among the Black Stork Ciconia nigra populations across Europe

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Spatio-temporal variation in nestling sex ratio among the Black Stork Ciconia nigra populations across Europe

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Spatio-temporal variation in nestling sex ratio among the Black Stork Ciconia nigra populations across Europe

Content Provider	Springer Nature Link
Author	Kovalov, Annika Kaldma, Katrin Bokotey, Andriy Brossault, Paul Chapalain, Frederic Dmitrek, Marina Dzyubenko, Natalie Sellis, Urmas Strazds, Māris Strenna, Luc Treinys, Rimgaudas Zielinski, Piotr Väli, Ülo
Copyright Year	2014
Abstract	Sex ratio is an indicator of population health as unexpected biases may indicate potential threats. We studied nestling sex ratio in Black Stork Ciconia nigra populations in order to check potential biases and differences along east–west and north–south gradient across its distribution range in Europe. We also studied variation between years, and checked potential correlations with weather variables. The overall sex ratio of nestlings in Europe was nearly equal with a non-significant deficiency (47.1 %) of males, the larger sex. Although yearly fluctuations in sex ratio were detected, no significant effect of the year alone was found, only simultaneously with population and brood size. There was a tendency to have a higher proportion of female nestlings in larger broods, but the pattern was probably scattered by the effect of reduction of largest broods. Compared to Western and Eastern Europe, a significant deficiency of male nestlings was found in Central Europe (Poland), whereas no differences were found along the north–south gradient. We did not find any effect of temperature, but rainfall during the incubation period was negatively correlated with the proportion of male nestlings in Central (Poland) and Western Europe (France) whereas in North-Eastern Europe (Latvia) the same effect of the precipitation in pre-breeding period was found. Räumliche und zeitliche Variation im Geschlechterverhältnis von Nestlingen der europäischen Populationen des Schwarzstorches Ciconia nigra Das Geschlechterverhältnis gibt Aufschluss über die Gesundheit einer Population, da unerwartete Schwankungen auf mögliche Gefahren hindeuten können. Wir untersuchten das Geschlechterverhältnis von Nestlingen in Schwarzstorch Ciconia nigra Populationen, um mögliche Ungleichverteilungen und Unterschiede im Ost-West oder Nord-Süd-Gradienten über seinem gesamten Verbreitungsgebiet in Europa zu entdecken. Wir betrachteten ebenfalls die Variation zwischen den Jahren und untersuchten mögliche Korrelationen mit Wetterbedingungen. Insgesamt war das Geschlechterverhältnis in Europa fast ausgeglichen, mit nicht signifikant geringerem Anteil von Männchen (47,1 %), dem größeren Geschlecht. Obwohl es jährliche Schwankungen gab, war der Jahreseffekt alleine nicht signifikant, sondern nur gemeinsam mit Population und Brutgröße. Tendenziell waren in größeren Bruten auch mehr Weibchen, doch der Zusammenhang war vermutlich verwischt durch Brutreduktion in den größten Bruten. Im Vergleich zu West- und Ost-Europa fiel ein signifikant geringerer Anteil männlicher Nestlinge in Zentraleuropa (Polen) auf. Auf dem Nord-Süd-Gradienten wurde keine Ungleichverteilung festgestellt. Temperatur hatte keinen Effekt, aber Niederschlag während der Inkubation korrelierte negativ mit dem Anteil männlicher Nestlinge in Zentraleuropa (Polen) und Westeuropa (Frankreich). In Nordosteuropa (Lettland) hatte Niederschlag vor der Brutperiode denselben Effekt auf das Geschlechterverhältnis.
Starting Page	381
Ending Page	387
Page Count	7
File Format	PDF
ISSN	21937192
Journal	Journal für Ornithologie
Volume Number	156
Issue Number	2
e-ISSN	21937206
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-11-14
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Black Stork Brood size Geographical variation Precipitation Sex ratio Weather Zoology Animal Ecology Evolutionary Biology
Content Type	Text
Resource Type	Article

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