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Title of Journal: J Ornithol

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Abbravation: Journal of Ornithology

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Springer Berlin Heidelberg

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DOI

10.1016/0951-8312(89)90041-6

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ISSN

2193-7206

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Nest aggregation and reproductive synchrony promot

Authors: Rosanna Di Maggio Daniela Campobello Maurizio Sarà
Publish Date: 2013/05/07
Volume: 154, Issue: 4, Pages: 901-910
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Abstract

Several factors promote coloniality by enhancing the fitness of colony members In birds spatial proximity among nests breeder abundance and reproductive synchrony have been proposed as primary factors responsible for enhanced colonial defence and foraging success which in turn enhance reproductive success Whether these factors function synergistically or antagonistically remains however an open question due to the absence of an integrated analysis of their effects on fitness We studied a large population of the Lesser Kestrel Falco naumanni a facultative colonial species breeding in colonies of different sizes in their typical pseudosteppe habitat We quantified both the singular and interactive effects of nest distance breeder abundance and reproductive synchrony on kestrel fitness measured as the time to survival of eggs to hatching and nestlings to fledging Egg survival increased as reproductive stages became more synchronous with the timing of colony breeding whereas nestling survival benefited from a higher synchrony with most nests in the entire population Nestling survival was also positively affected by the interaction between nest distance and breeder abundance Our results suggest that the presence of additional breeders in the colony is not sufficient per se to trigger colonial advantages but instead that synchronised reproduction among multiple breeding pairs nesting in close spatial proximity is necessary to realise those benefits Our findings provide a novel perspective for future investigations that explore the mechanisms underlying fitness variation among Lesser Kestrel colonies and groupliving species in generalVerschiedene Faktoren begünstigen die Koloniebildung durch die Optimierung der Fitness der einzelnen Koloniemitglieder Es wurde angenommen dass für die Koloniebildung bei Vögeln die räumliche Trennung der Nester die Anzahl der Brüter als auch die Synchronisierung der Reprodution primäre Faktoren darstellen für eine verbesserte Koloniebehauptung und Nahrungssuche und somit auch den Erfolg der Fortpflanzung begünstigen Ob diese Faktoren synergistisch oder antisynergistisch wirken bleibt soweit offen da bisher noch keine integrative Analyse auf deren Effekte auf die Fitness durchgeführt wurde In dieser Studie wurde eine groβe Population des Rötelfalken Falco naumanni untersucht eine fakultativ koloniebildende Art die in verschiedenen Koloniegröβen in einem steppenartigen Habitat lebt Quantifiziert wurden sowohl singuläre als auch interaktive Effekte der Nestdistanz Brüter Häufigkeit und der reproduktiven Synchronie auf die Fitness der Rötelfalken gemessen an der Überlebensrate der Eier der Zeit vom Schlüpfen bis zum Nestling und zum Flüggewerden Weiterhin konnte gezeigt werden dass die Überlebensrate der Eier mit der Synchronisierung des Nistens in der Kolonie steigt wohingegen das Überleben der Nestlinge ansteigt mit der Synchronisierung des Nistens der gesamten Population Das Überleben der Nestlinge war auβerdem positive beeinflusst von der Interaktion zwischen dem Abstand der Nester und der Abundanz der Brüter Unsere Ergebnisse lassen vermuten dass die Anwesenheit zusätzlicher Brüter in der Kolonie allein nicht ausreicht den Erfolg der Kolonie positiv zu beeinflussen sondern dass stattdessen die synchronisierte Reproduktion vieler Brutpaare die in enger Nachbarschaft nisten dafür von Nöten ist Unsere Ergebnisse weisen neue Perspektiven für zukünftige Forschungsansätze auf die sich mit den Mechanismen der Fitnessvariationen in Kolonien des Rötelfalken und anderen in Gruppen lebenden Arten befassenWe thank Rosario Mascara Stefano Triolo Joëlle Tysseire and Laura Zanca for field assistance and Emilio Giudice and Rosario Mascara for field accommodation An earlier version of the manuscript was greatly improved by suggestions of J F Hare and three anonymous reviewers Language was revised by J F Hare and ProofReadingServicecom Funding was provided by a Scientific Research Grant exquota 60  year 2007 University of Palermo to MS This study complies with the current Italian laws regulating scientific research on animals


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