Role of feeding in the reproductive ‘group effect’ in females of the German cockroach Blattella germanica (L.)

Holbrook, Glenn L.; Armstrong, Elka; Bachmann, Jane A.S.; Deasy, Bridget M.; Schal, Coby

doi:10.1016/s0022-1910(99)00201-2

Cited by 32 publications

(21 citation statements)

References 39 publications

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“…Significant differences between treatments are shown with an asterisk (Studentʼs t-test for day 24, t1.7291, P0.2004;Studentʼs t-test for day 29, t1.7081, P0.0314). (Holbrook et al, 2000). Therefore, other non-nutritional factors are likely to mediate the social facilitation of reproduction in B. germanica.…”

Section: Discussionmentioning

confidence: 99%

“…Only females from which we could measure both parameters were used, resulting in 26-33 females per treatment. JH biosynthesis was measured in vitro using a radiochemical assay (Pratt and Tobe, 1974;Gadot et al, 1989b;Holbrook et al, 2000). Briefly, the CA-corpora cardiaca complexes were dissected and incubated in modified methionine-free TC-199 medium (Specialty Media, Lavalette, NJ, USA), supplemented with 100mmoll…”

Section: Effects Of Female Density On Oocyte Maturation and Jh Biosynmentioning

confidence: 99%

“…This phenomenon has been investigated only in the German cockroach, Blattella germanica, and the brownbanded cockroach, Supella longipalpa. Whereas females of both species respond to mating stimuli with faster oocyte maturation, only B. germanica females, and not S. longipalpa females (Chon et al, 1990), respond to social interactions with a shorter preoviposition period and hence faster reproduction (Gadot et al, 1989b;Holbrook et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Differential physiological responses of the German cockroach to social interactions during the ovarian cycle

Uzsák

Schal

2012

Journal of Experimental Biology

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SUMMARYIn many animal species, social interactions can influence the morphology, physiology and behavior of individuals, including their rate of development and reproduction. Reproduction in cockroaches is regulated by juvenile hormone III (JH), and social interactions have been shown to accelerate female reproduction in the German cockroach, Blattella germanica (L.), by stimulating JH production. However, it is not clear in this or any other insect species whether social facilitation of the reproductive rate occurs throughout the ovarian cycle or only at certain stages. We compared the effects of social interactions during the preoviposition period (when JH production is high) and during gestation (when little JH is produced), as well as during the first ovarian cycle (when females are virgin) and the second ovarian cycle (after females had mated). Social interaction with one conspecific female was sufficient to accelerate JH production and oocyte maturation, but this effect was reversed by crowding. Social interactions also accelerated the onset of sexual receptivity in virgin females. However, social interactions failed to shorten gestation, suggesting that social cues stimulate JH production only when the corpora allata (CA) are active and not when CA activity is suppressed by the central nervous system. Females were most responsive to transient social isolation and transient social interactions when 2-3days old, suggesting that they are particularly sensitive to social interactions when their CA become active. Overall, these results show that all JH-dependent events in the reproductive cycle of B. germanica females are under the strong influence of social interactions.

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Section: Discussionmentioning

confidence: 99%

Section: Effects Of Female Density On Oocyte Maturation and Jh Biosynmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Differential physiological responses of the German cockroach to social interactions during the ovarian cycle

Uzsák

Schal

2012

Journal of Experimental Biology

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“…Here, two different insecticide compounds were used: propoxur (2-[1-methylethoxy]phenol methylcarbamate), a reversible inhibitor or the AChE, and fenoxycarb (2-[4-phenoxy]ethyl-ethylester carbamate), a juvenile hormone analogue (Holbrook et al 2000;Liang and Schal 1994). As a consequence of an increased concentration of juvenile hormones in the corpora allata of adult insects, reproductive behaviour, mating efficacy and sexual receptivity decreased significantly in various insect species (Lin and Lee 1998).…”

Section: Introductionmentioning

confidence: 99%

Effects of the carbamates fenoxycarb, propamocarb and propoxur on energy supply, glucose utilization and SH-groups in neurons

Schmuck

Mihail

2004

Archives of Toxicology

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Carbamates belonged to an older insecticide group, with propoxur being representative of this group. However, today carbamates with hormonal effects on insects, like fenoxycarb, or with fungicide properties, like propamocarb, are also used. The goal was a comparison of three structurally and functional different carbamates with a possibly common toxicological mechanism. Primary neuronal cell cultures of the rat are a well established model to identify neurotoxic compounds like n-hexane or acrylamide. In this cell culture model endpoints such as viability, energy supply, glucose consumption, glutathione (GSH) levels and cytoskeleton elements were determined. Added to cultured rat cortical neurons for 1 week, fenoxycarb, propamocarb and propoxur considerably decreased ATP levels, mitochondrial membrane potential and glucose consumption. Besides this, fenoxycarb and propamocarb had an impact on neurofilaments. After recovery for 1 week, propoxur also showed effects on neurofilaments, whereas with the other carbamates no tendency for a recovery was seen. These effects were prevented completely by pyruvate for propoxur and propamocarb, and partly so for fenoxycarb. In contrast to the main experimental design, GSH was determined after 1-h treatment with the test substances. Surprisingly, the compounds had only slight or no effect on the GSH level within this time. Further mechanistic studies indicated that carbamates primarily interacted with SH-groups, most likely by interfering with glycolysis and the construction of fibrillary proteins like neurofilaments. The prevention by pyruvate and acetylcysteine pointed to these biochemical endpoints.

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“…Newly emerged adult females were separated from the colony on the day of adult eclosion (day 0), and maintained in separate plastic cages. Females were always maintained in groups of 10-50·individuals because solitary females are reproductively repressed (Gadot et al, 1989;Holbrook et al, 2000). Females were mated on day 6, they oviposited on day 9, and embryos hatched from egg cases when females were 29·days old, or 20·days after oviposition under these conditions.…”

Section: Insect Colonymentioning

confidence: 99%

Cuticular hydrocarbons as maternal provisions in embryos and nymphs of the cockroach Blattella germanica

Fan

Eliyahu

Schal

2008

Journal of Experimental Biology

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Role of feeding in the reproductive ‘group effect’ in females of the German cockroach Blattella germanica (L.)

Cited by 32 publications

References 39 publications

Differential physiological responses of the German cockroach to social interactions during the ovarian cycle

Differential physiological responses of the German cockroach to social interactions during the ovarian cycle

Effects of the carbamates fenoxycarb, propamocarb and propoxur on energy supply, glucose utilization and SH-groups in neurons

Cuticular hydrocarbons as maternal provisions in embryos and nymphs of the cockroach Blattella germanica

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