Collapse of the endemic lizard Podarcis pityusensis on the island of Ibiza mediated by an invasive snake  

作　　者：Elba MONTES Fred KRAUS Brahim CHERGUI Juan M.PLEGUEZUELOS 

机构地区：[1]Department of Zoology,Faculty of Biological Sciences,University of Valencia,c/Dr.Moliner,50,Burjassot,E-46100 Valencia,Spain [2]Department of Ecology and Evolutionary Biology,University of Michigan,Ann Arbor,MI 48109,USA [3]Laboratoire Ecologie,Systématique,Conservation de la Biodiversité,Facultédes Sciences de Tétouan,UniversitéAbdelmalek Essaâdi,BP 2121 El M’Hannech,Tétouan,Morocco [4]Department of Zoology,Faculty of Sciences,Granada University,Granada E-18071,Spain

出　　处：《Current Zoology》2022年第3期295-303,共9页动物学报（英文版）

摘　　要：The invasive snake Hemorrhois hippocrepis colonized the island of Ibiza(Balearic Islands)in 2003 as stowaways inside trunks of olive trees imported for gardening.It has quickly spread since 2010,posing a threat to the island’s only remaining endemic vertebrate,the Ibiza wall lizard Podarcis pityusensis.We map the yearly expansion rate of the snake and estimate via transect surveys how severely it affects the distribution and abundance of the endemic lizard.As well,we surveyed 9 of 30 small lizard populations on islets surrounding Ibiza that have been isolated since the Last Glacial Maximum.Snakes had invaded 49%of Ibiza’s land area by 2018,and censuses show a critical contrast in lizard abundance between areas with and without snakes;almost all censuses in areas without snakes show lizard presence whereas nearly all censuses in areas with H.hippocrepis lack lizard sightings.Moreover,at least one subspecies previously thriving on one of the offshore islets has become extinct,and there have been several snakes recorded swimming between Ibiza and the surrounding islets.Therefore,lizard populations have been dramatically reduced or have vanished within the range of the snake,and our results quantitatively support upgrading this species’threat level for extinction.This study can inform to programs to manage invasive snake populations and to conservation actions to recover the endemic lizard.

关 键 词：Balearic Islands conservation extinction Hemorrhois hippocrepis lizard census 

分 类 号：Q95[生物学—动物学]