Fuelling Rates by Spring-Staging Ruffs Philomachus pugnax in Southern Belarus

Ardea

WÅ‚odzimierz Meissner¹  Natalia Karlionova²  Pavel Pinchuk² 

[1] 1 Avian Ecophysiology Unit, Department of Vertebrate Ecology and Zoology, University of GdaÅ„sk, Al. Legionów 9, 80-441 GdaÅ„sk, Poland;2 Institute of Zoology NAS Belarus, Belarus, Minsk 220072, Akademichnaya Str. 27

关键词: Belarus;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

OnthefloodplainmeadowsofthePripyatRiverinsouthernBelarus,RuffsPhilomachuspugnaxformconcentrationsofupto30,000individualsduringspringmigration.TheRuffsreplenishtheirenergyreservesbeforecontinuingtheirnorthwardsmigration.Overeightspringseasons,betweenlateMarchandmiddleMay2001–2008,wemeasuredthebodymassincreaseinasampleof2839adultand342immaturemales,and2058adultand136immaturefemalescaughtinthemiddlePripyatnearTurov.Bodymassincreasedintwophasesinthespringseason,risingslowlyinthefirstandfasterinthesecondphase;thebreakpointdatebetweenthetwophasesdifferedbetweenthesexes(24Apriland3May,respectively)andshowedlessvariationinfemalesthaninmales.Adultmalesgainedanaverageof1.1g/dayinthefirstphaseandlater2.4g/day.Immaturemalesgained0.39g/dayintheearlierphaseand1.7g/daylater.Adultfemalesgainedonaverage0.56g/dayintheearlyphaseand1.22g/daylater.Inimmaturefemalestherateofbodymassgainwasnotsignificant.Therateofbodymassincreasevariedamongyears.Thewaterlevelhadanegativeimpactonthebodymassincreaseinfemales,butnotinmales.Presumably,malesarelessaffectedbythewaterlevelastheyhavemuchlongerlegsandareabletoforageindeeperwater.Accordingtotheestimatedflightranges,bothsexeswereabletoreachatleastthebreedinggroundsinthewesternpartofSiberiainonenonstopflight,exceptinyearswithhigherwaterlevels.ThemiddlePripyatisprobablythelaststopoversitebeforetheirbreedinggroundsforatleastaportionofthesebirds.

【 授权许可】

Unknown