Impact of invasive spotted deer (Axis axis) on tropical island lizard communities in the Andaman archipelago

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• 作者：Nitya Prakash Mohanty ; S. Harikrishnan ; K. Sivakumar…
• 关键词：Mammalian herbivore ; Island endemics ; Herpetofauna ; Invasion ; Vegetation structure ; Indirect effect
• 刊名：Biological Invasions
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：18
• 期：1
• 页码：9-15
• 全文大小：549 KB
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• 作者单位：Nitya Prakash Mohanty (1) (3)
  S. Harikrishnan (1)
  K. Sivakumar (1)
  Karthikeyan Vasudevan (2)
  
  1. Wildlife Institute of India, P.O. Box 18, Chandrabani, Dehradun, Uttaranchal, 248001, India
  3. B-42, Sahid Nagar, Bhubaneshwar, Odisha, 751007, India
  2. CSIR-Centre for Cellular and Molecular Biology (CCMB), Laboratory for the Conservation of Endangered Species, Uppal Road, Hyderabad, 500 007, India
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Ecology
  Hydrobiology
  Zoology
  Forestry
  
• 出版者：Springer Netherlands
• ISSN：1573-1464

文摘

Introduced mammalian herbivores are known to be detrimental to native biodiversity and can alter ecosystem processes, by direct and indirect effects. Island systems, with inherently high rates of extinction are particularly susceptible to the impacts of such herbivores. The introduced spotted deer (Axis axis) is a potential threat to native forest floor and semi arboreal lizards in the Andaman Islands. We evaluated the nature and extent of this potential indirect effect on lizards from 2012 to 2014. We sampled for lizard abundance, arthropod abundance and understory vegetative cover on islands with varying intensity of spotted deer use. We inferred that, spotted deer depressed the abundance of forest floor and semi arboreal lizards approximately five fold, by reducing vegetative cover in the understory. The findings reveal a probable indirect effect of spotted deer on reptile abundance mediated by structural changes in the understory vegetation. The study provides evidence and the impetus for conservation of endemic reptiles in small tropical islands by mitigating the impacts of invasive spotted deer. Keywords Mammalian herbivore Island endemics Herpetofauna Invasion Vegetation structure Indirect effect