Trail following in Navanax inermis

August 29, 2006
From: Ernest Hartt

Concerning message #17506:

While this doesn't concern Risbecia, I did examine trail following in Navanax inermis in my Master's thesis. Here are my observations in this area:

Trail Following
The possible influence of trail following on conspecific predation by N. inermis was evaluated with multiple regression analyses using data recorded for each encounter which took place throughout the study.  Three regressions were performed, with cannibalism, the number of predation attempts in which the individual was the predator, and initiation of encounters as the dependent variables. The same independent variables were used in both regressions. They were water temperature, relative weight, collection site, feeding latency, pat dry wet weight, and trail following. Trail following was shown to be a significant factor in the initiation of encounters (regression p-value = 0.0001, factor p-value = 0.0001), and in the number of predation attempts in which the individual was the predator (regression p-value = 0.0001, factor p-value = 0.0001), but not for cannibalism itself (regression p-value = 0.0001, factor p-value = 0.3498). Those N. inermis that followed trails were more frequently the initiators of encounters, and of predation, but there was no significant effect on cannibalism by trail following.

Locality: San Diego, 3 cm, California, USA, Pacific Ocean, October 1989-September 1990, Laboratory. Length: various

Ernest Hartt

lumikko@snail-mail.net

Hartt, E. W, 2006 (Aug 29) Trail following in Navanax inermis. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17603

Dear Ernie,
Thanks for the information. Are you planning to publish your results?  Trail following in carnivorous aglajids, who are looking for prey, is a fairly understandable concept. However the trailing we find in sponge-feeding chromodorids, where conspecifics follow each other touching head to tail, is more difficult to understand. If you have any thoughts they would be most welcome

Best wishes,
Bill Rudman

Rudman, W.B., 2006 (Aug 29). Comment on Trail following in Navanax inermis by Ernest Hartt. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/17603

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