Cannibalism in Navanax inermis

February 19, 2001
From: Ernie Hartt

In response to Scott Johnson's message on cannibalism in Gymnodoris citrina, I would like to bring to your attention work I have done on cannibalism in Navanax inermis. The scientific journals had lots of anecdotal mention of Navanax cannibalism, but no real studies, so I picked that as my Master's research. In a nutshell, I found that while larger Navanax tend to be more successful at cannibalistic attempts, they are not as likely to initiate them as small individuals. The larger, reproductively active individuals would engage in cannibalism, but only occasionally. With over 600 encounters between 300 individuals, there were fewer than 25 cannibalisms.
Ernie Hartt

Lumikko@eudoramail.com

Hartt, E., 2001 (Feb 19) Cannibalism in Navanax inermis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3727

Dear Ernie,
Thanks for the information. Your brief account certainly raises lots of questions in my mind. Most importantly, are you planning to publish your results? I hope so. Secondly, were your observations field observations, and if so were the encounters that led to acts of cannibalism, chance encounters or did one animal hunt the other down?
Best wishes,
Bill Rudman

Rudman, W.B., 2001 (Feb 19). Comment on Cannibalism in Navanax inermis by Ernie Hartt. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/3727

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