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, 7 (4), e36375

Do Termites Avoid Carcasses? Behavioral Responses Depend on the Nature of the Carcasses

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Do Termites Avoid Carcasses? Behavioral Responses Depend on the Nature of the Carcasses

Kok-Boon Neoh et al. PLoS One.

Abstract

Background: Undertaking behavior is a significant adaptation to social life in enclosed nests. Workers are known to remove dead colony members from the nest. Such behavior prevents the spread of pathogens that may be detrimental to a colony. To date, little is known about the ethological aspects of how termites deal with carcasses.

Methodology and principal findings: In this study, we tested the responses to carcasses of four species from different subterranean termite taxa: Coptotermes formosanus Shiraki and Reticulitermes speratus (Kolbe) (lower termites) and Microcerotermes crassus Snyder and Globitermes sulphureus Haviland (higher termites). We also used different types of carcasses (freshly killed, 1-, 3-, and 7-day-old, and oven-killed carcasses) and mutilated nestmates to investigate whether the termites exhibited any behavioral responses that were specific to carcasses in certain conditions. Some behavioral responses were performed specifically on certain types of carcasses or mutilated termites. C. formosanus and R. speratus exhibited the following behaviors: (1) the frequency and time spent in antennating, grooming, and carcass removal of freshly killed, 1-day-old, and oven-killed carcasses were high, but these behaviors decreased as the carcasses aged; (2) the termites repeatedly crawled under the aging carcass piles; and (3) only newly dead termites were consumed as a food source. In contrast, M. crassus and G. sulphureus workers performed relatively few behavioral acts. Our results cast a new light on the previous notion that termites are necrophobic in nature.

Conclusion: We conclude that the behavioral response towards carcasses depends largely on the nature of the carcasses and termite species, and the response is more complex than was previously thought. Such behavioral responses likely are associated with the threat posed to the colony by the carcasses and the feeding habits and nesting ecology of a given species.

Conflict of interest statement

Competing Interests: The authors have read the journal's policy and have the following conflicts: Funds received from Bayer Environmental Science as a gift. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Figures

Figure 1
Figure 1. Behavioral repertoires of (A) Coptotermes formosanus, (B) Reticulitermes speratus, (C) Microcerotermes crassus, and (D) Globitermes sulphureus toward aged dead bodies, oven-killed bodies, and mutilated termites.
* jerking may happen before/after antennating or crawling under dead piles. Ethograms illustrate the behaviors shown during the 15 min observation period beginning with the first contact (circled) and the way termites handled the carcasses after 48 h.
Figure 2
Figure 2. Mean total time (s) of termites interacting with carcasses.
Error bars represent standard error of means. Means within a group followed by same letters were not significantly different, P>0.05.
Figure 3
Figure 3. The outcome of undertaking performed by Microcerotermes crassus in a dissected nest.
The carcasses (circled) apparently were confined in an isolated cavity with the wall sealed off from the rest of the nest.
Figure 4
Figure 4. Experimental set up for examining the effects of dead bodies and mutilated termites on healthy worker termites.

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