Habitat Selection and Density-Dependent Relationships in Spatial Occupancy by Male Little Bustards Tetrax tetrax
[摘要] ThisstudyanalyseshabitatselectionbymaleLittleBustardsTetraxtetraxofacentralSpanishpopulationwithintheirdisplaysitesduringtwoconsecutivebreedingseasons.Theareasofsexualdisplaysitesweredeterminedbyapplyingminimumconvexpolygons(MCP)tolocationsofindividualmalesthroughoutthe2001and2002breedingseasons.Habitatselectionwasaddressedbymeansofacompositionalanalysis.Theeffectsofvariablesrelatedtophenologyandtothedensityofconspecificswereexamined,assuminganidealfreedistributionoforganisms.Thespatialdistributionofdisplayareaswasalsoanalysed.DuringbothyearsmaleLittleBustardsshowedasignificantpreferenceforoldandsame-yearfallows,theseofferingbothshelterandfood.Contrarytowhatwasexpected,individualsdidnotselectlowerqualityhabitatswhenconspecificdensityincreasedorwhenareaswereoccupiedearlier,suggestingthatthepopulationwasnotsaturated.Displaysiteswerenotclumped,showingthatinthispopulationtheLittleBustardmaynotemployalekmatingsystem,eventhoughcertainrequirementsofanexplodedleksystem—theinclusioninterritoriesofparticularhabitattypesthatfemalescouldpotentiallyuse—weremet.Ourresultsemphasisetheimportanceofagrariansubstratesindeterminingoccupationbythisspecies,afindingwithdirectimplicationsfortheconservationofpopulationsgiventhattheagrarianlandscapeisonasufficientlylargescaleformanagementmeasurestobeintroduced.
[发布日期] [发布机构]
[效力级别] [学科分类] 动物科学
[关键词] Spain [时效性]
