Comparison of juvenile hormone and ecdysteroid haemolymph titres in adult worker and queen honey bees (Apis mellifera)

Robinson, Gene E.; Strambi, Colette; Strambi, Alain; Feldlaufer, Mark F.

doi:10.1016/0022-1910(91)90008-n

Cited by 147 publications

(101 citation statements)

References 36 publications

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“…Elevated ecdysteroids were previously reported for both honey bee queens and workers sampled from colonies containing laying workers, but the ovaries of the laying workers were not examined in that study (Robinson et al 1991). Here we show that workers with elevated ecdysteroid titers on day 12 did not exhibit morphological signs of ovary activation.…”

Section: Ecdysteroid Titers Were Unrelated To Ovary Activation and Ovmentioning

confidence: 81%

“…The expression of ecdysteroid receptors (EcR) in adult worker brains and ovaries suggests that steroids of ovarian origin can potentially regulate adult behavior and physiology (Nemoto and Hara 2007;Takeuchi et al 2007;Velarde et al 2009;Mullen et al 2014;Fahrbach et al 2017), but the few studies that have measured hemolymph ecdysteroids in adult workers have reported variable but generally low titers (Robinson et al 1991;Hartfelder et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Queen mandibular pheromone modulates hemolymph ecdysteroid titers in adult Apis mellifera workers

Trawinski

Fahrbach

2018

Apidologie

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-To test the hypothesis that exposure to queen mandibular pheromone (QMP) modulates ecdysteroid production in adult worker honey bees, ecdysteroids were measured in hemolymph and other tissues of individual adult worker honey bees reared with or without QMP in cages and field colonies. Ecdysteroid titers were higher in caged workers exposed to QMP continuously from the first day of adult life than in workers reared without QMP. Statistical cluster analysis suggested the possibility that a subgroup of workers (Bresponders^) is more sensitive to QMP in this regard than other workers. In 12-day-old workers, ecdysteroid titers in workers reared in queenright (QR) colonies were similar to those observed in cages with QMP, but lower than those in queenless (QL) colonies. Differences in number of ovarioles or degree of ovarian activation did not correlate with hemolymph ecdysteroids. Previous studies have demonstrated ecdysteroids in hemolymph in very young adult workers and in workers in QL colonies; the present study indicates that production of ecdysteroids occurs in older adult worker honey bees in the absence of morphological signs of ovarian activation, with cage studies revealing a modulatory role for QMP masked in the complex environment of the hive.ecdysteroids / ovary / queen mandibular pheromone / queenless / queenright

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Section: Ecdysteroid Titers Were Unrelated To Ovary Activation and Ovmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Queen mandibular pheromone modulates hemolymph ecdysteroid titers in adult Apis mellifera workers

Trawinski

Fahrbach

2018

Apidologie

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“…However, queens of honeybees and gamergates of the ponerine ant Diacamma sp. have considerably lower levels of juvenile hormone than foragers (Robinson et al 1991;Sommer et al 1993; but see Vargo 1992). Furthermore, queens of honeybees have a constantly high vitellogenin synthesis, which seems to be not under the control of juvenile hormone (Kaatz 1988).…”

Section: Discussionmentioning

confidence: 99%

Lay Eggs, Live Longer: Division of Labor and Life Span in a Clonal Ant Species

Hartmann

Heınze

2003

Evolution

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Abstract. Due to a trade-off between reproduction and life span, highly fertile individuals often live shorter lives than nonreproductive conspecifics. Perennial eusocial insects are exceptional in that reproductive queens live considerably longer than the nonreproductive workers. The two female castes may differ strongly in morphology, ontogeny, physiology, diet, behavior, and mating, and all these differences could be responsible for life span differences. In the ponerine ant Platythyrea punctata, morphological and ontogenetic caste differences do not exist. Instead, all workers are capable of producing diploid offspring through thelytokous parthenogenesis, and colonies are essentially clones. Here, we show that reproductives live significantly longer than nonreproductive workers. Reproductives stay in the nest during their whole life, whereas nonreproductives switch from intranidal tasks to foraging when they get older. Different work load and different hormone titers might proximately underlie the different life span of reproductives and nonreproductives in this ant.

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“…In adult social Hymenoptera, however, gonadotropic effects of JH are only supported in ancestral lineages (bumblebee, Bloch et al, 1996;paper wasp, Barth et al, 1975;Bohm, 1972) and not in the derived lineages such as honeybees (Robinson et al, 1991(Robinson et al, , 1992 and several ant species (Diacamma, Sommer et al, 1993;Streblognathus, Brent et al, 2006;Harpegnathos, Penick et al, 2011;Solenopsis, Brent and Vargo, 2003), implying that the gonadotropic function of JH is lost in derived lineages (Hartfelder, 2000). In contrast to JH, data are accumulating to support the commonness of positive associations between brain dopamine and reproductive status across the lineages ( paper wasp, Sasaki et al, 2007;bumblebee, Bloch et al, 2000;honeybee, Harris and Woodring, 1995;ants, Penick et al, 2014 and this study).…”

Section: Conserved Function Of Dopamine In Reproductive Differentiationmentioning

confidence: 99%

Social dominance and reproductive differentiation mediated by dopaminergic signaling in a queenless ant

Okada

Sasaki

Miyazaki

et al. 2015

Journal of Experimental Biology

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In social Hymenoptera with no morphological caste, a dominant female becomes an egg layer, whereas subordinates become sterile helpers. The physiological mechanism that links dominance rank and fecundity is an essential part of the emergence of sterile females, which reflects the primitive phase of eusociality. Recent studies suggest that brain biogenic amines are correlated with the ranks in dominance hierarchy. However, the actual causality between aminergic systems and phenotype (i.e. fecundity and aggressiveness) is largely unknown due to the pleiotropic functions of amines (e.g. age-dependent polyethism) and the scarcity of manipulation experiments. To clarify the causality among dominance ranks, amine levels and phenotypes, we examined the dynamics of the aminergic system during the ontogeny of dominance hierarchy in the queenless ant Diacamma sp., which undergoes rapid physiological differentiation based on dominance interactions. Brain dopamine levels differed between dominants and subordinates at day 7 after eclosion, although they did not differ at day 1, reflecting fecundity but not aggressiveness. Topical applications of dopamine to the subordinate workers induced oocyte growth but did not induce aggressiveness, suggesting the gonadotropic effect of dopamine. Additionally, dopamine receptor transcripts (dopr1 and dopr2) were elevated in the gaster fat body of dominant females, suggesting that the fat body is a potential target of neurohormonal dopamine. Based on this evidence, we suggest that brain dopamine levels are elevated in dominants as a result of hierarchy formation, and differences in dopamine levels cause the reproductive differentiation, probably via stimulation of the fat body.

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Comparison of juvenile hormone and ecdysteroid haemolymph titres in adult worker and queen honey bees (Apis mellifera)

Cited by 147 publications

References 36 publications

Queen mandibular pheromone modulates hemolymph ecdysteroid titers in adult Apis mellifera workers

Queen mandibular pheromone modulates hemolymph ecdysteroid titers in adult Apis mellifera workers

Lay Eggs, Live Longer: Division of Labor and Life Span in a Clonal Ant Species

Social dominance and reproductive differentiation mediated by dopaminergic signaling in a queenless ant

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