Hormonal Mediation of Insect Life Histories

Dingle, Hugh

doi:10.1016/b978-012532104-4/50043-3

Cited by 5 publications

(11 citation statements)

References 181 publications

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“…Allatectomy delays the onset of foraging, and this effect is eliminated with hormone replacement. This corroborates the general idea that JH is associated with the pacing of development in insects (Robinson and Vargo, 1997;Dingle, 2002). In crickets, JH has been shown specifically to stimulate neurogenesis in the mushroom bodies of adult females (Cayre et al, 1994), but JH effects on other aspects of Kenyon cell development in the cricket have not been reported.…”

Section: Discussionsupporting

confidence: 85%

Limits on volume changes in the mushroom bodies of the honey bee brain

et al. 2003

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The behavioral maturation of adult worker honey bees is influenced by a rising titer of juvenile hormone (JH), and is temporally correlated with an increase in the volume of the neuropil of the mushroom bodies, a brain region involved in learning and memory. We explored the stability of this neuropil expansion and its possible dependence on JH. We studied the volume of the mushroom bodies in adult bees deprived of JH by surgical removal of the source glands, the corpora allata. We also asked if the neuropil expansion detected in foragers persists when bees no longer engage in foraging, either because of the onset of winter or because colony social structure was experimentally manipulated to cause some bees to revert from foraging to tending brood (nursing). Results show that adult exposure to JH is not necessary for growth of the mushroom body neuropil, and that the volume of the mushroom body neuropil in adult bees is not reduced if foraging stops. These results are interpreted in the context of a qualitative model that posits that mushroom body neuropil volume enlargement in the honey bee has both experience-independent and experience-dependent components.

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Section: Discussionsupporting

confidence: 85%

Limits on volume changes in the mushroom bodies of the honey bee brain

et al. 2003

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“…This is true for soapberry bugs as we have seen, and seems to be true for barnacle geese, Branta leucopsis, at least for citrate synthase and fatty acid binding proteins (Butler et al 2003). Also part of migratory physiology are hormones that regulate the process (Rankin 1991;Dingle 1996Dingle , 2002. Hormonal involvement is complex and interacts with other aspects of particular physiologies such as circannual rhythms in birds (Gwinner and Helm 2003).…”

Section: Two Insect Migratory Syndromesmentioning

confidence: 80%

“…The complexity of hormonal regulation and the interactions of hormones in the physiology of functions that must be coordinated with migration, like reproduction, mean that more research in many more organisms is needed before we can fully understand the role of hormones in migration syndromes. The need is all the more important because of the role of hormones in translating and mediating genetic programs (Ketterson and Nolan 1999;Dingle 2002).…”

Section: Two Insect Migratory Syndromesmentioning

confidence: 99%

“…Hormonal involvement is complex and interacts with other aspects of particular physiologies such as circannual rhythms in birds (Gwinner and Helm 2003). Although only a few species have been studied, juvenile hormone and adipokinetic hormone seem to be primary in insects (Dingle 2002) and corticosterone has major involvement in birds (Wingfield 2003). The complexity of hormonal regulation and the interactions of hormones in the physiology of functions that must be coordinated with migration, like reproduction, mean that more research in many more organisms is needed before we can fully understand the role of hormones in migration syndromes.…”

Section: Two Insect Migratory Syndromesmentioning

confidence: 99%

“…Juvenile hormone (JH) and its esterase are primary influences on wing form in insects (Dingle 2002). In Jadera, responses to the JH analogue methoprene revealed host race differences (Dingle and Winchell 1997).…”

Section: Two Insect Migratory Syndromesmentioning

confidence: 99%

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Animal migration: is there a common migratory syndrome?

2006

Self Cite

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Ornithologists, and especially northern hemisphere ornithologists, have traditionally thought of migration as an annual return movement of populations between regular breeding and non-breeding grounds. Problems arise because selection does not ordinarily act on populations and because organisms of many taxa (including birds) are clearly migrants, but fail to undertake movements of the kind described. There are also extensive return movements that are not migratory. I propose that it is more useful to think of migration as a syndrome of behavioral and other traits that function together within individuals, and that such a syndrome provides a common ground across taxa from aphids to albatrosses. Large-scale return movements of populations are one outcome of the syndrome. Similar behavioral and physiological traits serve both to define migration and to provide a test for it. I use two insect (Hemipteran) examples to illustrate migratory syndromes and to demonstrate that, in many migrants, behavior and physiology correlate with life history and morphological traits to form syndromes at two levels. I then compare the two Hemipterans with migration in birds, butterflies, and fish to assess the question of whether there are migratory syndromes in common between these diverse migrants. Syndromes are more similar at the level of behavior than when morphology and life history traits are included. Recognizing syndromes leads to important evolutionary questions concerning migration strategies, trade-offs, the maintenance of genetic variance and the responses of migratory syndromes to both similar and different selective regimes.

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Evolution of Sexual Dimorphism and Male Dimorphism in the Expression of Beetle Horns: Phylogenetic Evidence for Modularity, Evolutionary Lability, and Constraint

Emlen¹,

Hunt²,

Simmons³

2005

The American Naturalist

156

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Beetle horns are enlarged outgrowths of the head or thorax that are used as weapons in contests over access to mates. Horn development is typically confined to males (sexual dimorphism) and often only to the largest males (male dimorphism). Both types of dimorphism result from endocrine threshold mechanisms that coordinate cell proliferation near the end of the larval period. Here, we map the presence/absence of each type of dimorphism onto a recent phylogeny for the genus Onthophagus (Coleoptera: Scarabaeidae) to explore how horn development has changed over time. Our results provide empirical support for several recent predictions regarding the evolutionary lability of developmental thresholds, including uncoupled evolution of alternative phenotypes and repeated fixation of phenotypes. We also report striking evidence of a possible developmental constraint. We show that male dimorphism and sexual dimorphism map together on the phylogeny; whenever small males have horns, females also have horns (and vice versa). We raise the possibility that correlated evolution of these two phenomena results from a shared element in their endocrine regulatory mechanisms rather than a history of common selection pressures. These results illustrate the type of insight that can be gained only from the integration of developmental and evolutionary perspectives.

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Hormonal Mediation of Insect Life Histories

Cited by 5 publications

References 181 publications

Limits on volume changes in the mushroom bodies of the honey bee brain

Limits on volume changes in the mushroom bodies of the honey bee brain

Animal migration: is there a common migratory syndrome?

Evolution of Sexual Dimorphism and Male Dimorphism in the Expression of Beetle Horns: Phylogenetic Evidence for Modularity, Evolutionary Lability, and Constraint

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