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Evolutionary Biology

, Volume 38, Issue 3, pp 243–257 | Cite as

Body Size and Termite Evolution

  • Christine A. Nalepa
Synthesis Paper

Abstract

Termites are a monophyletic lineage within the paraphyletic Blattaria, with xylophagous cockroaches in the genus Cryptocercus as sister group. Given this ancestry, termite divergence involved a substantial leap in body plans, as they are pale, fragile, and miniaturized relative to most cockroaches. Here I suggest that the evolutionary transition to an altricial morphotype in termites is grounded in the economics of utilizing a wood diet, and occurred via a series of sequential steps associated with modifications in social behavior. The chief benefit of an altricial morphotype is suggested to be nitrogen made available by decreasing individual body size and by dispensing with a heavy, melanized cuticle. The primary costs lie in increased vulnerability to environment hazards, including predators, pathogens, and desiccation. Termites tipped the evolutionary scale via cooperative behaviors that mitigate the cost or amplify the benefit of a small, fragile morphotype, and were present in rudimentary form in their cockroach relatives. These include building behavior, cooperative feeding, allogrooming, and most notably, trophallaxis. It was the directed circulation of nitrogenous reserves via trophallactic feeding among units of the superorganism rather than their progressive storage in a large, heavily armored body that was the foundation of termite evolutionary success.

Keywords

Altricial development Cuticle Trophallaxis Nitrogen Eusociality Miniaturization 

Notes

Acknowledgments

I am grateful to Donald Mullins for discussion and encouragement, to David Bignell for commenting on a part of the manuscript, to Peter Vršanský and Christian Bordereau for translations, and to Benedikt Hallgrimsson for his kind invitation to write this paper. These ideas were presented at the 16th Congress of the IUSSI (Copenhagen, August 2010). Dédié à la mémoire de Charles Noirot.

Glossary

Alate/dealates

Alates are the mature, winged reproductives of a termite colony. After these individuals have shed their wings prior to colony foundation they are called dealates

Coprophagy

The ingestion of fecal material

Helper

The terms helper and alloparent are used here interchangeably to indicate a developmentally arrested juvenile termite that performs parental tasks, but retains the ability to develop to reproductive maturity. These individuals are also called pseudoworkers or pseudergates

Imago

(pl. imagoes)—the post-metamorphic, sexually mature adult stage of an insect

Necrophagy

The ingestion of dead bodies

Polyethism

The division of labor among members of a colony

Proventriculus

The gizzard, at the posterior portion of the foregut

Teneral

A term applied to recently molted, pale, soft-bodied individuals

Trophallaxis

The exchange of alimentary canal fluid among colony members. Here the term refers to fluid originating from the anus (= proctodeal trophallaxis). The behavior is distinct from coprophagy

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© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of EntomologyNorth Carolina State UniversityRaleighUSA

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