Hybridization affects life-history traits and host specificity in Diorhabda spp.

Bitume, Ellyn; Bean, Dan W.; Stahlke, Amanda R.; Hufbauer, Ruth A.

doi:10.1016/j.biocontrol.2017.05.009

Cited by 21 publications

(31 citation statements)

References 49 publications

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“…As these two weevils are used across the globe for the biological control of water hyacinth, it is important to investigate the effect of hybridization on the performance and growth of these weevils. Interspecific hybrid crosses can result in hybrid vigor or hybrid breakdown (Arcella et al, 2014;Bean et al, 2013) as well as affect the host-specificity of a biological control agent (Bitume et al, 2017;Mathenge et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Into the weeds: Matching importation history to genetic consequences and pathways in two widely used biological control agents

Hopper

McCue

Pratt

et al. 2019

Evolutionary Applications

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The intentional introduction of exotic species through classical biological control programs provides unique opportunities to examine the consequences of population movement and ecological processes for the genetic diversity and population structure of introduced species. The weevils Neochetina bruchi and N. eichhorniae (Coleoptera: Curculionidae) have been introduced globally to control the invasive floating aquatic weed, Eichhornia crassipes , with variable outcomes. Here, we use the importation history and data from polymorphic microsatellite markers to examine the effects of introduction processes on population genetic diversity and structure. We report the first confirmation of hybridization between these species, which could have important consequences for the biological control program. For both species, there were more rare alleles in weevils from the native range than in weevils from the introduced range. N. eichhorniae also had higher allelic richness in the native range than in the introduced range. Neither the number of individuals initially introduced nor the number of introduction steps appeared to consistently affect genetic diversity. We found evidence of genetic drift, inbreeding, and admixture in several populations as well as significant population structure. Analyses estimated two populations and 11 sub‐clusters for N. bruchi and four populations and 23 sub‐clusters for N. eichhorniae , indicating divergence of populations during and after introduction. Genetic differentiation and allocation of introduced populations to source populations generally supported the documented importation history and clarified pathways in cases where multiple introductions occurred. In populations with multiple introductions, genetic admixture may have buffered against the negative effects of serial bottlenecks on genetic diversity. The genetic data combined with the introduction history from this biological control study system provide insight on the accuracy of predicting introduction pathways from genetic data and the consequences of these pathways for the genetic variation and structure of introduced species.

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Section: Discussionmentioning

confidence: 99%

Into the weeds: Matching importation history to genetic consequences and pathways in two widely used biological control agents

Hopper

McCue

Pratt

et al. 2019

Evolutionary Applications

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“…Hybridization in the context of biological control can lead to evolution of important life-history traits. Bitume et al (2017) found that, depending on which species crossed, hybridization could increase fecundity and reduce development time in tamarisk leaf beetles, Diorhabda spp., released to control tamarisk. Similarly, Sz} ucs et al (2012a) showed that admixture between two distinct populations of the ragwort flea beetle L. jacobaeae, released to control invasive J. vulgaris, increased fecundity.…”

Section: Novel Biotic Conditionsmentioning

confidence: 99%

“…In that system, hybrid populations have higher population densities and tend to be more effective at controlling target plants than non-hybrid populations in the field (Sz} ucs et al, 2019). This evidence suggests that hybridization can change ecological processes, such as population dynamics and herbivore-plant interactions and may increase efficacy of biological control, but whether it facilitates adaptation is not yet known (Sz} ucs et al, 2012a(Sz} ucs et al, , 2019Bitume et al, 2017).…”

Section: Novel Biotic Conditionsmentioning

confidence: 99%

The implications of rapid eco‐evolutionary processes for biological control ‐ a review

Szűcs

Vercken

Bitume

et al. 2019

Entomologia Exp Applicata

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Novel environmental conditions experienced by introduced species can drive rapid evolution of diverse traits. In turn, rapid evolution, both adaptive and non-adaptive, can influence population size, growth rate, and other important ecological characteristics of populations. In addition, spatial evolutionary processes that arise from a combination of assortative mating between highly dispersive individuals at the expanding edge of populations and altered reproductive rates of those individuals can accelerate expansion speed. Growing experimental evidence shows that the effects of rapid evolution on ecological dynamics can be quite large, and thus it can affect establishment, persistence, and the distribution of populations. We review the experimental and theoretical literature on such eco-evolutionary feedbacks and evaluate the implications of these processes for biological control. Experiments show that evolving populations can establish at higher rates and grow larger than non-evolving populations. However, non-adaptive processes, such as genetic drift and inbreeding depression can also lead to reduced fitness and declines in population size. Spatial evolutionary processes can increase spread rates and change the fitness of individuals at the expansion front. These examples demonstrate the power of eco-evolutionary dynamics and indicate that evolution is likely more important in biocontrol programs than previously realized. We discuss how this knowledge can be used to enhance efficacy of biological control.

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“…Additionally, D. carinata readily hybridizes with Diorhabda sublineata and Diorhabda elongata under laboratory conditions without a reduction in fecundity (2, 3) and appears to do so in the field (4). D. carinulata failed to produce stable hybrids with the other three clades (2).…”

Section: Announcementmentioning

confidence: 99%

Mitochondrial Genome Sequences of Diorhabda carinata and Diorhabda carinulata , Two Beetle Species Introduced to North America for Biological Control

Stahlke

Özsoy

Bean³

et al. 2019

Microbiol Resour Announc

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Hybridization affects life-history traits and host specificity in Diorhabda spp.

Cited by 21 publications

References 49 publications

Into the weeds: Matching importation history to genetic consequences and pathways in two widely used biological control agents

Into the weeds: Matching importation history to genetic consequences and pathways in two widely used biological control agents

The implications of rapid eco‐evolutionary processes for biological control ‐ a review

Mitochondrial Genome Sequences of Diorhabda carinata and Diorhabda carinulata , Two Beetle Species Introduced to North America for Biological Control

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