Influence of sex‐specific stimuli on ovarian maturation in primary and secondary reproductives of the dampwood termite Zootermopsis angusticollis

Abstract

Abstract. It was hypothesized that female primary and secondary reproductives of the termite Zootermopsis angusticollis Hagen require sex‐specific stimuli from a reproductive male to trigger ovarian maturation. To test this hypothesis, experimental laboratory colonies were established that contained female primary or secondary reproductives nesting: alone; with a male; with a female; and with three third‐ to fourth‐instar larvae. Following colony initiation, we measured changes in body mass, ovariole number and fecundity over 60 days. Results indicate that the reproductive maturation of female primaries was promoted by contact with a male but inhibited by the presence of another female. Secondary females were not affected by the presence of another reproductive, regardless of sex, but the development of reproductive competency of primary females appeared to depend on male‐specific stimulation. Reliance on male–female interaction to induce female reproductive development may ensure that the resources of newly dealate females are not wasted on producing larvae that would have a poor chance of surviving in the absence of a male. By contrast, secondary females maturing within established colonies are likely to have a mate and immediate assistance with non‐reproductive tasks, and therefore do not delay ovarian maturation and reproduction until they perceive male‐specific stimuli. These results demonstrate that male‐specific stimuli affect only the reproductive development of primary females, and suggest that the degree to which primary and secondary females depend on mate assistance may have shaped their physiological responses to the presence of a reproductive male.