Life-History Strategies and the Genetic Structure of Phytophagous Insect Populations

Peterson, M. J.; Denno, Robert F.

doi:10.1007/978-1-4757-0902-5_12

Cited by 52 publications

(60 citation statements)

References 205 publications

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“…Comparative studies of population structure in phytophagous insects have shown that genetic structure is mostly determined by the vagility of the species (Peterson and Denno, 1998). The very low genetic variation observed among H. abietis populations is likely to reflect its high dispersal ability, which has been observed in nongenetic studies (Solbreck, 1980;Nilssen, 1984).…”

Section: Among-population Dispersalmentioning

confidence: 96%

Genetic structure of the forest pest Hylobius abietis on conifer plantations at different spatial scales in Europe

et al. 2006

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The distribution of genetic variation within and among 20 European sites infested by the large pine weevil, Hylobius abietis, was analysed using dominant amplified fragment length polymorphism markers. Analysis of molecular variance was performed at the European, regional and local scales. Most of the genetic variability was found within rather than among populations and the global fixation index averaged over loci was low (0.07). We found no evidence of genetic drift, even in relatively isolated sites. This genetic pattern tends to confirm the high dispersal ability of the weevil and the influence of human-mediated expansion of its range through conifer plantations across Europe since the 19th century. Assignment tests demonstrated that the regional forest is a pertinent geographic scale for defining populations in the large pine weevil. Testing the potential influence of the larval host-plant identity (Scot Pine vs Norway Spruce) on the genetic structure revealed a weak but significant effect in two of the three regions tested (in Ardè che and in Limousin but not in Finland). One locus varied with host-plant use in the two French regions, indicating a potential role in host-plant adaptation. However, host-race formation is not observed in H. abietis; we discuss this result in the light of our current knowledge of this insect's biology. Altogether, this study shows that the use of different host plants for development does not constitute a strong barrier to gene flow for H. abietis and confirms the high dispersal ability of this forest pest.

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Section: Among-population Dispersalmentioning

confidence: 96%

Genetic structure of the forest pest Hylobius abietis on conifer plantations at different spatial scales in Europe

et al. 2006

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“…Gene flow among populations is the most likely factor, with the likelihood of local adaptation increasing with decreasing gene flow and increasing strength of selection (Peterson and Denno 1998). Gene flow among populations of amphipods on different hosts depends both on their mobility and the distribution of algae in space and time.…”

Section: Local Adaptation To Host Plantsmentioning

confidence: 99%

“…Adult mobility and temporal stability of host plant patches (Peterson and Denno 1998), however, may influence the likelihood of local adaptation in this system. Low levels of movement, either active or passive, may be enough to prevent differentiation of populations.…”

Section: Local Adaptation To Host Plantsmentioning

confidence: 99%

Host-Plant Adaptation in an Herbivorous Marine Amphipod: Genetic Potential Not Realized in Field Populations

Poore

Steinberg

2001

Evolution

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Abstract. Evolutionary responses of herbivores to their host plants depend not only on selection from plants, but also on the genetic basis of traits relating to host use. The genetic basis of such traits has been investigated extensively among terrestrial insect herbivores, but has received almost no attention among marine herbivores. We tested whether performance traits in the herbivorous marine amphipod Peramphithoe parmerong display heritable variation and, for the first time for a marine herbivore, whether selection has resulted in local adaptation to host plants on two spatial scales. Peramphithoe parmerong displayed heritable genetic variation for survival on two host macroalgae, the highquality Sargassum linearifolium and the poor-quality Padina crassa, and for growth on S. linearifolium. Differences in performance on different hosts thus have the potential to select for differential use of hosts by this amphipod. Despite this potential, there was no evidence among field populations of local adaptation to host algae on either scale tested: between hosts within a site or among sites differing in algal species composition. Within a site, amphipods were not more likely to prefer or perform better on the host on which they were collected. Similarly, amphipods collected from sites in which P. crassa was present were not more likely to perform well on this host than amphipods collected from sites where this alga was not found. Ecological factors that may explain the persistence of P. parmerong on P. crassa and the possibility of phylogenetic constraints on host use by P. parmerong are discussed.Key words. Algae, amphipods, herbivory, heritability, host-plant adaptation.Received November 22, 1999. Accepted August 10, 2000.Explanatory models of plant-herbivore interactions commonly assume that plants exert a selective pressure on herbivore traits that relate to use of host plants. Differential fitness of herbivores on various plant parts, individuals, or species is thought to select for both preference traits that influence the behavioral choice of plant resources and performance traits that are responsible for growth, survival, and fecundity of herbivores consuming a given plant resource. The response of herbivore traits to natural selection by plants, however, is dependent not only on differential performance (i.e., the intensity of selection), but also on the genetic basis of the traits in question. Preference or performance traits must vary between individuals in a population and the traits must be heritable for selection to alter use of host plants by herbivores (i.e., variation among individuals resulting at least in part from additive genetic variation; Falconer 1989).The genetic relationship between traits is also important, with some models relying on indirect selection to alter the use of host plants by herbivores. A common working hypothesis for host choice by herbivores has been that adult herbivores select hosts on the basis of their offsprings' performance, resulting in a correlation between prefer...

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“…Various environmental factors can promote the relative isolation of populations, such as geographic distances, physical barriers to gene flow, habitat (or host-plant) suitability and/or fragmentation (Peterson and Denno, 1998a). Some intrinsic life history or ecological traits (dispersal capacities, occurrence of dispersing life stages, lifespan, adaptability to new environments, and so on) can also be of major importance to shape the distribution of intra-specific diversity (Peterson and Denno, 1998b). Many phytophagous insects are geographically structured, but local adaptation and host-plant fidelity were proved to play a major role in genetic isolation between populations in many cases (Dres and Mallet, 2002).…”

Section: Introductionmentioning

confidence: 99%

Comparative population genetic study of two oligophagous insects associated with the same hosts

Kerdelhué¹,

Magnoux²,

Lieutier³

et al. 2006

Heredity

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A parallel study of the genetic structure of two oligophagous species associated with the same hosts was conducted to determine the main factors shaping the distribution of genetic diversity. The bark beetle Tomicus piniperda and the pine processionary moth (PPM) Thaumetopoea pityocampa are both associated with the genus Pinus and belong to different guilds (xylophagous vs defoliating species). The PPM is an ectophagous species that feeds on the needles of living trees, whereas T. piniperda is endophagous and bores galleries in the inner bark of weakened trees. Both species were sampled in the main regions of France, and their genetic structure was assessed after genotyping with five microsatellite markers. Populations of the PPM were significantly structured. A pattern of isolation by distance was found when distances were calculated as bypassing the Massif Central, whereas no such pattern could be found with raw geographic distances. On the contrary, most populations of T. piniperda were not differentiated. No effect of host species could be detected in either of the two species. We conclude that the two taxa have contrasting effective dispersal rates per generation, and we hypothesize that this reflects the different selection pressures acting on individual fitness via different strategies of host use.

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Life-History Strategies and the Genetic Structure of Phytophagous Insect Populations

Cited by 52 publications

References 205 publications

Genetic structure of the forest pest Hylobius abietis on conifer plantations at different spatial scales in Europe

Genetic structure of the forest pest Hylobius abietis on conifer plantations at different spatial scales in Europe

Host-Plant Adaptation in an Herbivorous Marine Amphipod: Genetic Potential Not Realized in Field Populations

Comparative population genetic study of two oligophagous insects associated with the same hosts

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