Long-term memory in Thrips tabaci (Thysanoptera, Thripidae)

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Abstract

Microinsects are capable of associative learning and memory retention despite significant reduction in the number and size of neurons. Previously, the capabilities of Thrips tabaci (Thysanoptera, Thripidae) for associative learning and the formation of short-term memory have been demonstrated. In this study, an additional training session was added, as well as a time interval between them. Increasing the number of training sessions and spacing these out over time allowed us to demonstrate the persistence of memory traces for up to 24 hours. Thus, for the first time, the presence of consolidated forms of memory in the order Thysanoptera has been revealed.

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About the authors

M. A. Fedorova

Lomonosov Moscow State University

Author for correspondence.
Email: mariafedorova1997@gmail.com
Russian Federation, Moscow

S. E. Farisenkov

Lomonosov Moscow State University

Email: mariafedorova1997@gmail.com
Russian Federation, Moscow

A. A. Polilov

Lomonosov Moscow State University

Email: mariafedorova1997@gmail.com
Russian Federation, Moscow

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2. Fig. 1. Proportion of time (%) spent by T. tabaci in the target sector in each of the tests (M±SE) in the experiment with one training session (A) and the experiment with two training sessions (B). T-pretest is pre-test, T4 is 4 h after training, T24 is 24 h after training. t-test: * p < 0.05, ** p < 0.01. At the base of each column is the number of insects studied

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3. Fig. 2. Learning index (ratio of the difference between the time in the target sector and the time in the opposite sector to the total time in the two sectors) of T. tabaci in each of the tests (M±SE) in the experiment with one training session (A) and the experiment with two training sessions (B). T-test is pre-test, T4 is 4 h after training, and T24 is 24 h after training. t-test: * p < 0.05, ** p < 0.01

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