NDLI: Tail length and sexual selection in a monogamous, monomorphic species, the Roseate Tern Sterna dougallii

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Tail length and sexual selection in a monogamous, monomorphic species, the Roseate Tern Sterna dougallii

Content Provider	Springer Nature Link
Author	Palestis, Brian G. Nisbet, Ian C. T. Hatch, Jeremy J. Arld, Jennifer M. Szczys, Patricia
Copyright Year	2012
Abstract	Both male and female Roseate Terns (Sterna dougallii) have unusually long outer tail feathers, and males tend to have longer tails than females. We examined whether these tail streamers may have evolved as a result of sexual selection, using data from a 15-year study at Bird Island, Massachusetts, USA. Data on tail length were analyzed for 2,515 terns, of which 745 were of known sex. Tail length was positively correlated with predictors of reproductive success, such as laying date, body mass, and age, and thus can act as an indicator of mate quality. The increase in mean tail length with age appeared to result from a combination of growth in relatively young terns and differential survival among older terns. The mean duration of pair bonds was short at 1.73 years. A female-biased sex ratio is present in this population, and we demonstrated that short-tailed females are not preferred mates: females paired to males had longer tails than those in female–female pairs or other multi-female associations. In male–female pairs, tail lengths of mates were correlated, but this may have resulted in part from the correlation in ages. These observations are consistent with the hypothesis that tail streamers are used by both sexes in mate choice. In contrast to our results for tail length, tail symmetry was not significantly related to indices of individual quality and was not significantly correlated between mates. Schwanzlänge und sexuelle Selektion in der monogamen und monomorphen Rosenseeschwalbe Sterna dougallii Männliche wie weibliche Rosenseeschwalben (Sterna dougallii) haben ungewöhnlich lange äußere Schwanzfedern, wobei die der Männchen normalerweise noch länger sind. Anhand der Daten einer 15 jährigen Studie auf Bird Island in Massachusetts (USA) untersuchten wir, ob diese Schwanzfedern aufgrund sexueller Selektion entstanden. Wir untersuchten die Schwanzlängen von 2,515 Seeschwalben, wobei 745 bekannten Geschlechts waren. Schwanzlänge war positiv korreliert mit Variablen, die den Reproduktionserfolg beeinflussen (Legedatum, Körpermasse, Alter), und könnte daher als Anzeichen für die Qualität des Brutpartners verwendet werden. Das Wachstum junger Seeschwalben und ungleiche Überlebensraten älterer Individuen schien die Verlängerung der Schwanzfedern mit dem Alter zu bedingen. Die mittlere Dauer einer Paarbindung war 1,73 Jahre. In der Studienpopulation war ein Weibchenüberschuss gegeben und wir fanden, dass kurzschwänzige Weibchen nicht die bevorzugten Partner waren: Weibchen, die mit Männchen verpaart waren, hatten längere Schwanzfedern, als solche in Paaren von zwei Weibchen oder anderen Weibchenverbänden. In Männchen-Weibchen Paaren waren die Schwanzlängen der Partner korreliert, aber das mag zum Teil an der Korrelation der Alter von Paarpartnern gelegen haben. Diese Beobachtungen stimmen mit der Vermutung überein, dass die Länge der Schwanzfedern von beiden Geschlechtern in der Partnerwahl berücksichtigt wird. Entgegen der Ergebnisse für Schwanzlänge war die Symmetrie der Schwanzfedern kein Indiz für individuelle Qualität und war zwischen Partnern nicht signifikant korreliert.
Starting Page	1153
Ending Page	1163
Page Count	11
File Format	PDF
ISSN	21937192
Journal	Journal für Ornithologie
Volume Number	153
Issue Number	4
e-ISSN	21937206
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-04-18
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Female–female pair Fluctuating asymmetry Sexual selection Sterna dougallii Tail length Zoology Evolutionary Biology Animal Ecology
Content Type	Text
Resource Type	Article

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