Rain, fish and snakes

climatically driven population dynamics of Arafura filesnakes in tropical Australia

Thomas Madsen, Richard Shine

Research output: Contribution to journalArticle

82 Citations (Scopus)


Arafura filesnakes (Acrochordus arafurae) are large (up to 2.5 m, 5 kg) aquatic nonvenomous snakes that feed entirely on fishes. A 10-year field study in the Australian wet-dry tropics revealed strong correlations between rainfall patterns, fish abundance, and snake population dynamics. All of these characteristics showed considerable annual variation. High rainfall late in the wet season (February-March) caused prolonged inundation of the floodplain. Following such years, dry-season sampling revealed that fishes were abundant, filesnakes were in good body condition, and a high proportion of adult female filesnakes were reproductive. Annual variation in recruitment to the population (as judged by the relative abundance of yearling snakes) was also correlated with fish abundance and thus, with rainfall patterns in the late-wet season. Our results fit well with those from other studies on a diverse array of aquatic and terrestrial species within the wet-dry tropics. Annual variation in rainfall patterns, via its effects on prey abundance, may drive the population dynamics of many tropical predators.

Original languageEnglish
Pages (from-to)208-215
Number of pages8
Issue number2
Publication statusPublished - Aug 2000
Externally publishedYes


  • Acrochordidae
  • Acrochordus arafurae
  • Annual variation
  • Food intake
  • Reproduction

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