Feeding, Longevity and Reproduction of Adults of Acanthoscelides Obtectus Say in Laboratory Conditions

Leroi, B.

doi:10.1007/978-94-017-3286-4_10

Cited by 19 publications

(16 citation statements)

References 6 publications

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“…Callosobruchus chinensis (Fujii, 1968) or C. maculatus (Credland, 1990), the exact experimental protocols or simply sampling variation cannot be determined from the published accounts. Even in the absence of food (Leroi, 1981), oviposition is more protracted in A. obtectus , lasting for up to 10 days, than in C. maculatus where it is complete in approximately 6 days. The fecundity schedule of A. obtectus is unusual among bruchids because most species, e.g.…”

Section: Discussionmentioning

confidence: 99%

Determinants of oviposition inAcanthoscelides obtectus: a nonconformist bruchid

Parsons¹,

Credland²

2003

Physiological Entomology

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Abstract. Acanthoscelides obtectus is atypical of bruchids found in stored seeds because females do not attach eggs individually to host seeds but scatter them irregularly among potential hosts. In other respects, its life history resembles that of other species and comparison provides evidence for the adaptive nature of their behaviour. Individual females differ dramatically in the temporal pattern of their oviposition. The hypothesis is proposed that this is an adaptation to life in heterogeneous habitats. Oviposition is not regulated by host availability to the same extent as in other bruchids, providing evidence that regulation of the number of eggs laid by species which stick eggs to host seeds is an adaptation to the abundance of hosts. The continued presence of males and opportunity for multiple matings does not affect fecundity or egg viability. Females preferentially lay on clean seeds when provided with a choice between them and seeds previously exposed to other adult beetles. However, they do not appear to be deterred by, or cannot detect, the presence of larvae infesting seeds. Other bruchid species avoid such seeds that they can identify by the occurrence of egg cases and pheromones. The number of eggs laid is influenced by the host cultivar available for oviposition. Oviposition by A. obtectus appears to be an adaptation to both storage environments and the heterogeneous environment of a growing crop or uncultivated land. Its behaviour suggests an ancestral condition in bruchids and the changes which might have occurred in the ecology of other bruchid species as they have adapted to become pests of human seed stores.

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Section: Discussionmentioning

confidence: 99%

Determinants of oviposition inAcanthoscelides obtectus: a nonconformist bruchid

Parsons¹,

Credland²

2003

Physiological Entomology

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“…). Furthermore, it has been suggested that adult bruchines frequently experience dehydration because they do not feed (or feed little) and that the females may gain additional water supply by ejaculates (Leroi ; Arnqvist et al. ).…”

Section: Discussionmentioning

confidence: 99%

The effect of seed traits on geographic variation in body size and sexual size dimorphism of the seed‐feeding beetle Acanthoscelides macrophthalmus

Haga

Rossi

2016

Ecology and Evolution

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Explaining large‐scale patterns of variation in body size has been considered a central question in ecology and evolutionary biology because several life‐history traits are directly linked to body size. For ectothermic organisms, little is known about what processes influence geographic variation in body size. Changes in body size and sexual size dimorphism (SSD) have been associated with environmental variables, particularly for Bruchinae insects, which feed exclusively on seeds during the larval stage. However, the effect of important seed traits on body size variation has rarely been investigated, and whether SSD varies substantially among populations within bruchine species is poorly known. Using the seed‐feeding beetle Acanthoscelides macrophthalmus infesting its host plant Leucaena leucocephala, we investigated whether specific seed traits (hardness, size, water content, carbon/nitrogen ratio, and phenolic content) were determinant in generating geographic variation in body size and SSD of A. macrophthalmus. We also examined the relationships between body size and SSD with latitude and altitude. The body size of both sexes combined was not related to latitude, altitude, and any of the physical and chemical seed traits. However, the female body size tended to vary more in size than the males, generating significant variation in SSD in relation to latitude and altitude. The females were the larger sex at higher latitudes and at lower altitudes, precisely where seed water content was greater. Therefore, our results suggest that water content was the most important seed trait, most severely affecting the females, promoting geographic variation in SSD of A. macrophthalmus.

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“…In the seed beetles, mating can reduce females’ longevity, mediated, for instance, through the seminal compounds with toxic side‐effects (Das et al. 1980), but can also prolong females’ longevity by providing them with water and/or nutrients contained in male ejaculates (Leroi 1981; Arnquist et al. 2005; Maklakov et al.…”

Section: Discussionmentioning

confidence: 99%

Sexual selection and senescence: do seed beetle males (Acanthoscelides obtectus, Bruchidae, Coleoptera) shape the longevity of their mates?

Šešlija¹,

Marečko²,

Tucić³

2008

Journal of Zoological Systematics and Evolutionary Research

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Although the reasons why organisms age and die are generally well understood, it has recently been suggested that an optimal life span has evolved not only as the result of trade‐offs between reproductive performances early and late in life, but also that a balance between the costs and benefits of the number of mating has also played an important role in the evolution of ageing in both sexes. By using four seed beetle (Acanthoscelides obtectus) lines selected for different life history traits, but which have also inadvertently created monoandrous and polyandrous conditions, we showed that males evolved to affect the mortality patterns of females in a way consistent to the postmating sexual selection generated by sexually antagonistic co‐evolution theory. Monoandrous males, irrespectively of body weight and other life history traits specific to their lines, evolved to increase the longevity of control females kept under starvation and suppressed fecundity, compared with males that originated in the lines with effectively polyandrous conditions. When females were allowed to lay eggs, the effects of males from different lines and mating type history on the senescence of females were substantially weaker. We found that males in the line that was evolved to decelerate senescence and polyandrous conditions stimulate the earlier onset of females’ oviposition, relative to males stemmed from the line with accelerated senescence and monoandrous conditions. This fact may explain the absence of difference in the mean longevities between the control females mated to these males and highlight the importance of sexual selection in the evolution of ageing.

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Feeding, Longevity and Reproduction of Adults of Acanthoscelides Obtectus Say in Laboratory Conditions

Cited by 19 publications

References 6 publications

Determinants of oviposition inAcanthoscelides obtectus: a nonconformist bruchid

Determinants of oviposition inAcanthoscelides obtectus: a nonconformist bruchid

The effect of seed traits on geographic variation in body size and sexual size dimorphism of the seed‐feeding beetle Acanthoscelides macrophthalmus

Sexual selection and senescence: do seed beetle males (Acanthoscelides obtectus, Bruchidae, Coleoptera) shape the longevity of their mates?

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