Growth factors and population density in the American cockroach, Periplaneta americana

Wharton, D. R. A.; Lola, J.E.; Wharton, Martha L.

doi:10.1016/0022-1910(68)90224-2

Cited by 32 publications

(14 citation statements)

References 18 publications

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“…These species develop optimally at a level usually above isolation but well below extremely high densities (31, 51, 137, 140). At present, group effect has been documented in crickets, cockroaches, aphids, locusts, and many other groups of insects (19,20,21,58,111,137,138).…”

Section: Group Effectmentioning

confidence: 98%

See 1 more Smart Citation

Influence of Population Density on Size, Fecundity, and Developmental Rate of Insects in Culture

Peters¹,

Barbosa²

1977

Annu. Rev. Entomol.

188

112

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Section: Group Effectmentioning

confidence: 98%

“…Most species in which crowding leads to mortality respond similarly. The severity of mortality or the age-specific pattern of mortality varies from species to species and is in part a function of the rearing condition used and the species strain (4, 18, 40, 64,117,132,138,140).…”

Section: Developmental Ratementioning

confidence: 99%

Influence of Population Density on Size, Fecundity, and Developmental Rate of Insects in Culture

Peters¹,

Barbosa²

1977

Annu. Rev. Entomol.

188

112

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“…Both species are nocturnal, and in both, visual, olfactory and gustatory cues from conspecifics appear to have little or no effect on nymphal growth, whereas tactile stimulation is sufficient to trigger faster development [7], [8], [12], [42]. The effect of social experience on nymphal development is not species-specific, because nymphs of B. germanica grouped with other cockroach species or even locusts grow faster than isolated nymphs [8], [12].…”

Section: Introductionmentioning

confidence: 97%

“…Thus, grouping can affect larval development [5]–[12], and larval or adult morphology [13]–[18]. In several cockroach species, for example, grouped nymphs develop faster and reach the adult stage sooner than those reared in isolation [7], [8], [12], [19], [20]. The sensory cues that mediate group-induced phenotypic plasticity may derive from direct social interactions or from perceiving the presence of conspecifics without direct contact.…”

Section: Introductionmentioning

confidence: 99%

Sensory Cues Involved in Social Facilitation of Reproduction in Blattella germanica Females

Uzsák

Schal

2013

PLoS ONE

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Cockroaches, like many other animal species, form aggregations in which social stimuli from conspecifics can alter the physiology, morphology, or behavior of individuals. In adult females of the German cockroach, Blattella germanica, social isolation slows oocyte development, sexual maturation, and sexual receptivity, whereas social interactions as minimal as between just two females accelerate reproduction; however, the sensory modalities and pathways that mediate these physiological and behavioral changes are poorly understood. We explored the roles of visual, olfactory, and tactile cues in the reproductive physiology of German cockroach females, and whether their effects are species-specific and related to circadian time. Our results show that tactile cues are the primary sensory input associated with social conditions—with no evidence for involvement of the visual and olfactory systems—and that the antennae play an important role in the reception of these tactile cues. This conclusion is supported by the observation that interactions with other insect species of similar or larger size and with similar antennal morphology also stimulate oocyte development in B. germanica. Social facilitation of reproduction is expected to be influenced by the circadian timing system, as females engage in more social contact during the day when they shelter in aggregations with conspecifics. Surprisingly, however, the female's reproductive rate was unresponsive to social interactions during the photophase, whereas social interactions as short as two hours during the scotophase were sufficient to induce faster reproduction.We discuss the adaptive significance of these sensory-neuroendocrine responses in the German cockroach.

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“…Previous studies on social facilitation in cockroaches have focused on nymphal development, where social interactions greatly accelerate the pace of development (Roth and Willis, 1960;Wharton et al, 1968;Izutsu et al, 1970;Woodhead and Paulson, 1983;Lihoreau and Rivault, 2008). Little is known, however, about socially facilitated physiological changes in adult cockroaches.…”

Section: Introductionmentioning

confidence: 99%

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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Growth factors and population density in the American cockroach, Periplaneta americana

Cited by 32 publications

References 18 publications

Influence of Population Density on Size, Fecundity, and Developmental Rate of Insects in Culture

Influence of Population Density on Size, Fecundity, and Developmental Rate of Insects in Culture

Sensory Cues Involved in Social Facilitation of Reproduction in Blattella germanica Females

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

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