The British Herpetological Society

The Herpetological Journal is the Society's prestigious quarterly scientific journal. Articles are listed in Biological Abstracts, Current Awareness in Biological Sciences,Current Contents, Science Citation Index, and Zoological Record.

The 2017/18  impact factor of The Herpetological Journal is 1.268

ISSN 0268-0130


pdf 04. Diet and foraging behaviour of Natrix maura

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Open Access

pp.53-61

Authors: Adrian Hailey  and p. M . C. Davies

Abstract: There was an ontogenetic change in the diet of the water snake Natrix maura, from earthworms and tadpoles in juvenile snakes to fish in adults. This was related to the absolute sizes of these prey types and to the scaling of encounter rates with snake size. Within each prey type relative prey weight RPW was independent of snake size, except for fish taken from drying pools (RPW inversely related to snake size). Overall, R PW increased with snake size (prey taken during normal foraging) or was independent of snake size (including fish from drying pools). Snakes handled fish too large for them to ingest. Multiple captures were common from drying pools, the fish being smaller than when a single fish was taken.
Foraging behaviour of wild N. maura could be described as exploratory activity and cruising (finding slowmoving or trapped prey during slow movement); sentinel predation (an extreme sit-and-wait strategy for catching fish); active pursuit and undirected 'fishing' (less commonly observed). Sentinel N. maura took up different positions in the water according to their size. Breathing took up 20 per cent of their time; those at the surface spent shorter intervals foraging and breathing than those with deeper perches. Strike rate was once per 7.4 minutes, capture success was low, 2 out of 1 24 strikes, neither ingested. The relationship between the different types of foraging used by N. maura and other natricine snakes, and their stimulus control, are discussed.

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IMPORTANT NOTE - JUNE 2020

Please note that as from Volume 31 Number 1 (January 2021) on, the Herpetological Journal will be available as an online publication only - the last print edition will be Volume 30 Number 4.   

Aligning with this change, it is now no longer possible to purchase a subscription that includes a print copy of the HJ.  All members who have existing HJ print subscriptions that remain active as at end June 2020 will receive the full four 2020 print editions.  New subscribers or renewals after this time will only have option to subscribe to the online only subscription package.  Subscription pricing has been amended to reflect the content changes.