Postmating isolation and genetically variable host use in ecologically divergent host forms of Neochlamisus bebbianae leaf beetles

Egan, Scott P.; Janson, Eric M.; Brown, Christopher G.; Funk, Daniel J.

doi:10.1111/j.1420-9101.2011.02350.x

Cited by 16 publications

(9 citation statements)

References 64 publications

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“…In the present study, we demonstrated that multiple populations of both gall-former species, inhabiting either of two closely related oak species, express strong preferences for their natal host plant species. Our results are consistent with partial habitat isolation evolving in these gall wasps as a by-product of adaptation to different hosts, as has now been demonstrated to be an important component to reproductive isolation in a number of plant–insect systems ( Timema stick insects [50], leaf beetles [7], [54], pea aphids [55], ladybird beetles [56], Rhagoletis fruit flies [6], and Eurosta galling flies [49]). …”

Section: Discussionsupporting

confidence: 90%

Parallel Patterns of Morphological and Behavioral Variation among Host-Associated Populations of Two Gall Wasp Species

et al. 2013

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A powerful approach to address the general factors contributing to ecological speciation is to compare distantly related taxa that inhabit the same selective environments. In this design, similarities among taxa can elucidate general mechanisms of the process whereas differences may uncover specific factors important to the process for individual taxa. Herein, we present evidence of parallel patterns of morphological and behavioral variation among host-associated populations of two species of cynipid gall wasps, Belonocnema treatae and Disholcaspis quercusvirens, that each exhibit a life cycle intimately tied to the same two host plant environments, Quercus geminata and Q. virginiana. Across both gall-former species we find consistent differences in body size and gall morphology associated with host plant use, as well as strong differences in host plant preference, a measure of habitat isolation among populations. These consistent differences among taxa highlight the important role of host plant use in promoting reproductive isolation and morphological variation among herbivorous insect populations–a prerequisite for ecological speciation.

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Section: Discussionsupporting

confidence: 90%

Parallel Patterns of Morphological and Behavioral Variation among Host-Associated Populations of Two Gall Wasp Species

et al. 2013

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“…(5b) Hybrids between these host forms exhibit reduced growth rate and survivorship than the parental types do on their native hosts [41,47].…”

Section: From Host Forms To Host Racesmentioning

confidence: 99%

“…(5a) Each host form grows faster and survives better on its native host than on the host of the other host form [35,41,47].…”

Section: From Host Forms To Host Racesmentioning

confidence: 99%

Of “Host Forms” and Host Races: Terminological Issues in Ecological Speciation

Funk

2012

International Journal of Ecology

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Successful communication and accurate inferences in science depend on the common understanding and consistent usage of the terms we apply to concepts of interest. Likewise, new terminology is required when important concepts have gone unnamed. Here, I focus on terminological issues about biological variation and ecological speciation, especially in herbivorous insects but also more generally. I call for the more restricted use of concepts that have sometimes been misapplied, and thus caution against synonymizing ecological speciation with sympatric speciation and the unwarranted invocation of "host races" to describe herbivorous insect differentiation. I also call for the qualified application of terms for different kinds of biological variation and for host range when confronting uncertainty. Among other "missing terms" introduced here is "host form," a generic term describing any case of host-associated differences for which current evidence does not allow diagnosis of the specific kind of variation. Embracing the use of host form should free host race from its current overapplication. Finally, I present a case study in which Neochlamisus leaf beetle populations previously described as host forms are hereby declared to be host races, based on accumulated evidence supporting each of the associated criteria.

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“…In our study, the inherited pattern for host use depended not only on the cross, but the preference of the maternal species. A growing body of literature suggests that for herbivorous insect species, mothers have been shown to influence host use (Amarillo-Suarez & Fox 2006; Egan et al 2011; Cahenzli & Erhardt 2013). Egan et al (2011) specifically demonstrated that host-use and performance are traits with sex-linked maternal influence.…”

Section: Discussionmentioning

confidence: 99%

“…A growing body of literature suggests that for herbivorous insect species, mothers have been shown to influence host use (Amarillo-Suarez & Fox 2006; Egan et al 2011; Cahenzli & Erhardt 2013). Egan et al (2011) specifically demonstrated that host-use and performance are traits with sex-linked maternal influence. Consequently, the pattern of host specificity in hybrid crosses can be hard to predict since it will depend not only on the amount of genetic variation across a suite of traits, but also parental influence.…”

Section: Discussionmentioning

confidence: 99%

Hybridization affects life-history traits and host specificity inDiorhabdaspp

Bitume¹,

Bean²,

Stahlke

et al. 2017

Preprint

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26Hybridization is an influential evolutionary process that has been viewed alternatively as an 27 evolutionary dead-end or as an important creative evolutionary force. In colonizing species, such 28 as introduced biological control agents, hybridization can negate the effects of bottlenecks and 29 genetic drift through increasing genetic variation. Such changes could be beneficial to a 30 biological control program by increasing the chances of establishment success. However, 31 hybridization can also lead to the emergence of transgressive phenotypes that could alter host 32 specificity; an important consideration when assessing potential non-target impacts of planned 33 agents. In a series of lab experiments, we investigated the effects of hybridization between three 34 species of Diorhabda released to control invasive Tamarix (saltcedar) on life history traits 35 through two generations, and through the third generation for one cross. Depending on the cross, 36 hybridization had either a positive or neutral impact on development time, adult mass, and 37 fecundity. We evaluated preference for the target (saltcedar) relative to a non-target host Tamarix 38 aphylla (athel), and found host specificity patterns varied in two of the three hybrids, 39 demonstrating the possibility for hybridization to alter host preference. Importantly, the overall 40 effects of hybridization were inconsistent by cross, leading to unpredictability in the outcome of 41 using hybrids in biological control.

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Postmating isolation and genetically variable host use in ecologically divergent host forms of Neochlamisus bebbianae leaf beetles

Cited by 16 publications

References 64 publications

Parallel Patterns of Morphological and Behavioral Variation among Host-Associated Populations of Two Gall Wasp Species

Parallel Patterns of Morphological and Behavioral Variation among Host-Associated Populations of Two Gall Wasp Species

Of “Host Forms” and Host Races: Terminological Issues in Ecological Speciation

Hybridization affects life-history traits and host specificity inDiorhabdaspp

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