Rain, fish and snakes: climatically driven population dynamics of Arafura filesnakes in tropical Australia.

Abstract:

: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.

journal_name

Oecologia

journal_title

Oecologia

authors

Madsen T,Shine R

doi

10.1007/s004420050008

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

208-215

issue

2

eissn

0029-8549

issn

1432-1939

pii

10.1007/s004420050008

journal_volume

124

pub_type

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