| Summary: | Dichromatism in Passerine Males and Other Aspects of Sexual Selection Lucie Schwarzová 1. Summary of PhD Thesis Themaingoalof thepresentedlhesiswasto testsomeof thepredictionsof lrypotheses conoerningdolayedplumagemefurstion(DPM) in ťreBlack Frodsbrrt(Phoenicurus ochraros),a speoiossuitablefor suoha studydueto itshighbreodingdensityin urban hebitats.I studiedarrival pattorrl size, quality anddishibutional pattemoftemitories and aggressivebehaviourofsubadultandadultmalegandhormonaloorrelatosofplumage colourationin Black Redstart. ThebirdsinhabitingSoulhMoravianvillagesdid notshowdifferentialtimingof anivals betweenyearlings andolder birds in thoresource-richenvironment. On theotheÍ hand,undersuboptimaloonditionsin Praguetheyoarlingsworedelayedofthroedayson averagecomparedtotheadultmales.Thoreis thepossibiliý for theyoungbirdsofthis speciesb samplethesituationona potentialbroedingsite during autumnalsinging periď andflexibly fit its migratingbehaviouraccordingto tro circumstances.In suoha casethorďuction investnenthypothosisis thobestexplanationfor diÍferentarrival timingof yearlingandadultmalosin Black Redstart. To testp,redictionsof statussignallrypothesigwhich olaimsthattheadultsless frequently attrokdull colourď subadultmales,andconsoquerrtlyDPM facilitatessurvivalofsubadults...
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