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International Journal Of Bilogical Sciences

The Soldiers in Societies: Defense, Regulation, and Evolution

Li Tian and Xuguo Zhou
Department of Entomology, University of Kentucky, Lexington, KY 40546-0091, USA.  Corresponding author: Dr. Xuguo Joe Zhou, Department of Entomology, University of Kentucky, S-225 Agricultural Science Center North, Lexington, KY 40546-0091. Phone: 859-257-3125 Fax: 859-323-1120 Email: xuguozhou@uky.edu.
Abstract :

The presence of reproductively altruistic castes is one of the primary traits of the eusocial societies. Adaptation and regulation of the sterile caste, to a certain extent, drives the evolution of eusociality. Depending on adaptive functions of the first evolved sterile caste, eusocial societies can be categorized into the worker-first and soldier-first lineages, respectively. The former is marked by a worker caste as the first evolved altruistic caste, whose primary function is housekeeping, and the latter is highlighted by a sterile soldier caste as the first evolved altruistic caste, whose task is predominantly colony defense. The apparent functional differences between these two fundamentally important castes suggest worker-first and soldier-first eusociality are potentially driven by a suite of distinctively different factors. Current studies of eusocial evolution have been focused largely on the worker-first Hymenoptera, whereas understanding of soldier-first lineages including termites, eusocial aphids, gall-dwelling thrips, and snapping shrimp, is greatly lacking. In this review, we summarize the current state of knowledge on biology, morphology, adaptive functions, and caste regulation of the soldier caste. In addition, we discuss the biological, ecological and genetic factors that might contribute to the evolution of distinct caste systems within eusocial lineages.

Keywords :
Soldier, eusociality, eusocial evolution, termites, Hymenoptera, soldier-first lineage, worker-first lineage

Date Deposited : 03 Feb 2016 12:41

Last Modified : 03 Feb 2016 12:41

Official URL: http://www.ijbs.com/v10i3

Volume 10, Number 3, - 2014 , ISSN 1449-2288

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