Global Genetic Differentiation in a Cosmopolitan Pest of Stored Beans: Effects of Geography, Host-Plant Usage and Anthropogenic Factors

Tuda, Midori; Kagoshima, Kumiko; Toquenaga, Yukihiko; Arnqvist, Göran

doi:10.1371/journal.pone.0106268

Cited by 64 publications

(66 citation statements)

References 89 publications

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“…All populations were reared under standardized conditions on V. unguiculata at a population size of 400-500 individuals in 1 l stock jars and at 308C, 60% RH and a 12 D : 12 L cycle in climate cabinets. These populations were all collected as pests in bean storage sites or crop fields and were brought into the laboratory at various points in time (range 1975-2010) and they show different degrees of genetic divergence [33,34], but are fully reproductively compatible: hatching rate of eggs in crosses between populations is invariably very high (more than 95%). We note that V. unguiculata is the main natural host for this species and the rearing conditions used (including non-overlapping generations and abiotic conditions) mimic natural conditions [35].…”

Section: Materials and Methods (A) Species Populations And Rearingmentioning

confidence: 99%

Genome size correlates with reproductive fitness in seed beetles

et al. 2015

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The ultimate cause of genome size (GS) evolution in eukaryotes remains a major and unresolved puzzle in evolutionary biology. Large-scale comparative studies have failed to find consistent correlations between GS and organismal properties, resulting in the 'C-value paradox'. Current hypotheses for the evolution of GS are based either on the balance between mutational events and drift or on natural selection acting upon standing genetic variation in GS. It is, however, currently very difficult to evaluate the role of selection because within-species studies that relate variation in lifehistory traits to variation in GS are very rare. Here, we report phylogenetic comparative analyses of GS evolution in seed beetles at two distinct taxonomic scales, which combines replicated estimation of GS with experimental assays of life-history traits and reproductive fitness. GS showed rapid and bidirectional evolution across species, but did not show correlated evolution with any of several indices of the relative importance of genetic drift. Within a single species, GS varied by 4-5% across populations and showed positive correlated evolution with independent estimates of male and female reproductive fitness. Collectively, the phylogenetic pattern of GS diversification across and within species in conjunction with the pattern of correlated evolution between GS and fitness provide novel support for the tenet that natural selection plays a key role in shaping GS evolution.

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Section: Materials and Methods (A) Species Populations And Rearingmentioning

confidence: 99%

Genome size correlates with reproductive fitness in seed beetles

et al. 2015

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“…2007; Rankin and Arnqvist 2008; Arnqvist and Tuda 2010; Tuda et al. 2014). Thus, the groups used in this study provide broad phenotypic and phylogenetic coverage, including interpopulation, interspecies, and intergenus variation.…”

Section: Methodsmentioning

confidence: 99%

A comparative approach to testing hypotheses for the evolution of sex‐biased dispersal in bean beetles

Downey

Searle

Bellur

et al. 2015

Ecology and Evolution

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Understanding the selective forces that shape dispersal strategies is a fundamental goal of evolutionary ecology and is increasingly important in changing, human‐altered environments. Sex‐biased dispersal (SBD) is common in dioecious taxa, and understanding variation in the direction and magnitude of SBD across taxa has been a persistent challenge. We took a comparative, laboratory‐based approach using 16 groups (species or strains) of bean beetles (genera Acanthoscelides, Callosobruchus, and Zabrotes, including 10 strains of one species) to test two predictions that emerge from dominant hypotheses for the evolution of SBD: (1) groups that suffer greater costs of inbreeding should exhibit greater SBD in favor of either sex (inbreeding avoidance hypothesis) and (2) groups with stronger local mate competition should exhibit greater male bias in dispersal (kin competition avoidance hypothesis). We used laboratory experiments to quantify SBD in crawling dispersal, the fitness effects of inbreeding, and the degree of polygyny (number of female mates per male), a proxy for local mate competition. While we found that both polygyny and male‐biased dispersal were common across bean beetle groups, consistent with the kin competition avoidance hypothesis, quantitative relationships between trait values did not support the predictions. Across groups, there was no significant association between SBD and effects of inbreeding nor SBD and degree of polygyny, using either raw values or phylogenetically independent contrasts. We discuss possible limitations of our experimental approach for detecting the predicted relationships, as well as reasons why single‐factor hypotheses may be too simplistic to explain the evolution of SBD.

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“…The beetle's original host was likely the wild progenitor of cowpea, Vigna unguiculata (L.) Walpers, and related Vigna spp. in Africa (Tuda et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Specificity of adaptation to a novel host plant by a seed beetle

Messina

Johnson

2014

Entomologia Exp Applicata

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Adaptation to one novel host plant may simultaneously improve an insect's performance on other unfamiliar hosts, as a kind of cross-adaptation. In selection experiments using an Asian population of the seed beetle Callosobruchus maculatus (Fabricius) (Coleoptera: Chrysomelidae: Bruchinae), larval survival in lentil seeds increased from about 1 to >90% in fewer than 30 generations, and acceptance of lentil by egg-laying females increased two-to three-fold. We examined whether rapid adaptation to lentil altered beetle performance on other grain legumes, including hosts more closely related to lentil than to the ancestral host, mung bean. Three replicate, lentil-adapted lines were compared to the mung-bean (control) line with respect to both host acceptance (oviposition under no-choice conditions) and larval performance (survival to adult emergence, development time, and adult mass at emergence). In most experiments, females from the lentil lines laid more eggs on unfamiliar hosts than did females from the mung-bean line. Greater oviposition on novel hosts could not be explained by variation in potential fecundity, and did not appear to depend on a host's relatedness to lentil. Although survival in lentil remained extremely divergent between the mung-bean and lentil lines (0 vs. >90%), the lines did not differ in larval performance on two other novel hosts (pea and fava bean) that are much more closely related to lentil than to mung bean. Because larval performance is most likely the limiting factor in the potential colonization of a novel host by C. maculatus, our experiments did not provide strong evidence for cross-adaptation. The results suggest that adaptation to even a highly marginal host need not lead to a general expansion of an insect's host range.

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Global Genetic Differentiation in a Cosmopolitan Pest of Stored Beans: Effects of Geography, Host-Plant Usage and Anthropogenic Factors

Cited by 64 publications

References 89 publications

Genome size correlates with reproductive fitness in seed beetles

Genome size correlates with reproductive fitness in seed beetles

A comparative approach to testing hypotheses for the evolution of sex‐biased dispersal in bean beetles

Specificity of adaptation to a novel host plant by a seed beetle

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