Effects of Haemoparsite Infection and Food Supplementation on a High Elevation Passerine Bird

Avian Malaria;Food Supplementation;Passerine;Reproductive Success;Natural Resources and Environment

Morgan, HarrietOzgul, Arpat ;

University of Michigan

关键词: Avian Malaria;    Food Supplementation;    Passerine;    Reproductive Success;    Natural Resources and Environment;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/109690/Harriet_Morgan_Final_Thesis_Dec_14.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Strongcircumstantialevidencefromlaboratoryandtheoreticalstudiessuggeststhatsublethalparasiteburdenscaninfluencehostpopulationdynamicswhetheractingaloneorinconjunctionwithreducedfoodavailability.Thesignificanceoftheseeffectshasrarelybeenexaminedinnaturalenvironments.Thisstudyaimstoexaminetheinteractiveeffectsofavianmalarialhaemoparasiteinfectionsandfoodsupplementationinafoodlimitedfree‐livingpopulationofMountainWhite‐crownedSparrows(Zonotrichia leucophrys oriantha)breedinginGunnisonNationalForest,Gothic,CO.Toanalyzetheeffectsofhaemoparasites(Plasmodium, Leucocytozoon, andHaemoproteus)andfoodsupplementationonmultipleaspectsofreproductivesuccess,weanalyzedbloodsmeardata(todetermineinfectionstatus)andmanipulatedsparrowfoodavailability.Duringtheearlybreedingseason,whennaturalfoodavailabilityisespeciallyscarceduetoresidualsnowpackandfrequentspringsnowstorms,supplementalfoodwasprovidedonselectplots.Wequantifiedtheimpactofhaemoparasiteinfectionandfoodsupplementationonreproductivesuccessbyevaluating:dailynestsurvival(DNS),clutchsize,probabilityoftheclutchhatching,probabilityofthenestlingsfledging,andoffspringquality.Ourdataunderscoretheimpactsofavianmalariaonthereproductivesuccessofafree‐livingavianpopulationwheremalariaisendemic.Mostofthenegativeeffectsofmalariainfectionsareobservedinyoung‐rearingphase.Inaddition,wedocumentedasupportedstrongpositiveeffectoffoodsupplementation,whichhoweverwasrestrictedtotheincubationphase.Therewasnoeffectofinfectionorfoodsupplementationonclutchsize,oronthequalityofthefledged(quantifiedasyoungmassortarsuslength).Interestingly,wedidnotdetectanyinteractionsbetweenfoodsupplementationandbloodparasitecoinfectioninanymetricsofreproductivesuccess,dailynestsurvival,oroffspringquality.