Recent, Rapid, Colonisation of Lao PDR from the South by Yellow-Vented Bulbul Pycnonotus Goiavier

Ardea

J.W. Duckworth¹ 

[1] 1 P.O. Box 5573, Vientiane, Lao PDR ([e-mail])

关键词: Range Expansion;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Acrossmostofthetropicsitisoftendifficulttotellwhetherextensionsofknownrangebybirdspeciesreflectgenuinechangeorareartefactsofincreasedobservation.Yellow-ventedBulbulPycnonotusgoiavierisamainlySundaicpasserineknownfromsouthernIndochina(southernThailand,CambodiaandsouthernmostVietnam)formanydecades.ThefirstLaorecordcameonlyin1996butsincethenthespecieshasspreadnorththroughLaoPDRalongtheMekongandsomemajortributaries.AllLaorecordsarefromthelowlandplains,innon-foresthabitat.InspectionofthelocationsofrecordsandofbirdrecordingpatternsinLaoPDRovertimeindicatethatthisbulbul'snorthernexpansion,paralleledbyoneinadjacentThailand,issurelynotsimplythebelatedfindingofaspecieslong-overlooked.Bothclimatechangeandhabitatchange(forestconversionandfragmentation)areplausiblecauses.Thatfiveofsixnon-forestpasserinesthathavecolonised(ormassivelyexpandedin)LaoPDRinthelast30yearsarefromthesouth,withonefromthewestbutnonefromthenorth,maysuggestclimaticchangeasthecause,buttheirratesofexpansionfaroutstripnorthwardtemperaturemovement.WhileYellow-ventedBulbul'schangeinnationalstatusisobvious,eventhoughLaoPDRisoneoftheleastknowncountriesforbirdsinSouth-eastAsia,disentanglingtherolesofthesetwosimultaneousmajoreffectsinavifaunalchangeinSouth-eastAsiaischallenging.

【 授权许可】

Unknown