Predictable Modification of Body Size and Competitive Ability Following a Host Shift by a Seed Beetle

Messina, Frank J.

doi:10.1554/04-372

Cited by 51 publications

(111 citation statements)

References 90 publications

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“…In no case did fi tness gains refl ect changes in offspring survival, indicating that traits contributing directly to offspring viability may be much less evolvable than behavioural or phenological traits (despite high heritability of offspring viability, see below). This result concurs with past studies, which have generally found that host acceptance evolves faster than related physiological changes needed to increase offspring viability (Futuyma et al, 1984;Messina, 2004b).…”

Section: Discussionsupporting

confidence: 93%

Warp-speed adaptation to novel hosts after 300 generations of enforced dietary specialisation in the seed beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae)

Price¹,

Leonard²,

Lancaster³

2017

Eur. J. Entomol.

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Section: Discussionsupporting

confidence: 93%

Warp-speed adaptation to novel hosts after 300 generations of enforced dietary specialisation in the seed beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae)

Price¹,

Leonard²,

Lancaster³

2017

Eur. J. Entomol.

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“…First, our observation indicates that B. loti larvae experience competition of the contest type, in which only one adult emerges from a seed. A single larva that survives competition decreases the seed contents by feeding but leaves a sufficient amount of the contents intact for successful germination (Messina 2004;Mano et al 2007). Second, the parasitoid species that attack B. loti larvae are of the idiobiont type.…”

Section: Discussionmentioning

confidence: 99%

Parasitoid attack of the seed-feeding beetle Bruchus loti enhances the germination success of Lathyrus japonicus seeds

Kondo

Akimoto

2011

Arthropod-Plant Interactions

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Hard seeds of some legume species can germinate after seed-feeding insects bore through the seed coat and consequently break seed dormancy. Larvae of bruchine beetles are the main seed feeders attacking many legume species. Boring of the hard seed coat by bruchine beetle larvae enhances the germination percentage of legume species, but consuming too much of a single seed may reduce the chances the seed will survive. We hypothesise that the early mortality of bruchine larvae due to parasitism contributes positively to seed germination because larvae are killed before consuming too large a quantity of the seed. Here, we tested this hypothesis using Lathyrus japonicus seeds and Bruchus loti, the main seed feeder attacking this plant. B. loti larvae were mainly parasitised by two species of idiobiont parasitoidsPteromalus sp. and Dinarmus sp. The seeds from which Pteromalus wasps emerged germinated more successfully than did the seeds from which B. loti adults emerged. B. loti larvae parasitised by the two wasp species consumed the seeds less intensively than did unparasitised larvae. Thus, the results of experiments supported our hypothesis. However, the germination success varied significantly between the seeds from which Pteromalus and Dinarmus wasps emerged. The difference in the size of seeds the two wasp species chose for parasitism may have influenced the germination percentage.

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“…The Burkina Faso (BF) population was collected in 1989 from infested pods of cowpea, V. unguiculata (L.) Walp., in Ouagadougou, Burkina Faso (Messina 1993). These two populations differ in body size, lifetime fecundity, patterns of egg dispersion, oviposition preference, and adult life span (Fox et al 2004a,b;Messina 2004). Both populations were maintained in laboratory growth chambers on seeds of V. radiata (SI) or V. unguiculata (BF) at .1000 adults per generation for .100 generations (BF) or .200 generations (SI) prior to this experiment.…”

Section: Methodsmentioning

confidence: 99%

The Genetic Architecture of Life Span and Mortality Rates: Gender and Species Differences in Inbreeding Load of Two Seed-Feeding Beetles

et al. 2006

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We examine the inbreeding load for adult life span and mortality rates of two seed beetle species, Callosobruchus maculatus and Stator limbatus. Inbreeding load differs substantially between males and females in both study populations of C. maculatus-life span of inbred females was 9-13% shorter than the life span of outbred females, whereas the life span of inbred males did not differ from the life span of outbred males. The effect of inbreeding on female life span was largely due to an increase in the slope of the mortality curve. In contrast, inbreeding had only a small effect on the life span of S. limbatus-life spans of inbred beetles were $5% shorter than those of outbred beetles, and there was no difference in inbreeding load between the sexes. The inbreeding load for mean life span was $0.4-0.6 lethal equivalents per haploid gamete for female C. maculatus and $0.2-0.3 for both males and females of S. limbatus, all within the range of estimates commonly obtained for Drosophila. However, contrary to the predictions of mutation-accumulation models, inbreeding load for loci affecting mortality rates did not increase with age in either species, despite an effect of inbreeding on the initial rate of increase in mortality. This was because mortality rates decelerated with age and converged to a mortality plateau for both outbred and inbred beetles.T HE evolution of life span, mortality rates, and patterns of senescence is of substantial interest because there is tremendous variation in these traits at all taxonomic levels (Promislow 1991) and because of the medical implications of understanding the genetics underlying mortality rates. Studies on mice, Drosophila, and Caenorhabditis elegans have identified numerous genes that influence life span and/or rates of senescence (Harshman 2002). Recent studies of life span in Drosophila melanogaster indicate that inheritance of life span can be quite complex, with both dominance and epistasis having significant effects on variation in life span (Harshman 2002;Leips and Mackay 2002;Mackay 2002;Spencer et al. 2003;Spencer and Promislow 2005). These studies also show that the genetic architecture (number of genes and degree of allelic and genic interactions) underlying life span differs between the sexes and depends on the environmental conditions in which individuals are reared.One of the major genetic mechanisms proposed to underlie senescence is the accumulation in populations of late-acting deleterious alleles due to the declining force of selection with increasing age (mutation-accumulation theory) (Hughes and Reynolds 2005). Research has now identified many genes and chromosomal regions (QTL) that affect life span in model organisms but we have few data on the frequency of deleterious alleles affecting life span (De Luca et al. 2003;Carbone et al. 2006). We have less data on the sources of variation in deleterious alleles and the age specificity of expression of those alleles and thus their effects on age-specific mortality rates.Inbreeding studies are a com...

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Predictable Modification of Body Size and Competitive Ability Following a Host Shift by a Seed Beetle

Cited by 51 publications

References 90 publications

Warp-speed adaptation to novel hosts after 300 generations of enforced dietary specialisation in the seed beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae)

Warp-speed adaptation to novel hosts after 300 generations of enforced dietary specialisation in the seed beetle Callosobruchus maculatus (Coleoptera: Chrysomelidae: Bruchinae)

Parasitoid attack of the seed-feeding beetle Bruchus loti enhances the germination success of Lathyrus japonicus seeds

The Genetic Architecture of Life Span and Mortality Rates: Gender and Species Differences in Inbreeding Load of Two Seed-Feeding Beetles

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