Helminth Diversity of Green Treefrogs (Hyla cinerea) in Their Expanded Geographical Range

Edwards, Dale D.; Gordon, Noah M.

doi:10.1645/20-6

Cited by 4 publications

(3 citation statements)

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“…Because density of hosts is low at the range edge, selection may favor increased infectivity of the parasite, which, in turn, might result in increased resistance among toads at the invasion front to counter the increased infectivity of local lungworms (Brown et al, 2018; Mayer, Shine, & Brown, 2021). Increased host resistance at range edges could also arise from additional energy allocation to immune function as a result of altered life history decisions associated with invasion (Edwards & Gordon, 2021). Moreover, when the parasite depends upon its host for dispersal, it may benefit from lower virulence at an expanding range edge (because parasite traits that reduce host dispersal rate will be absent at the invasion front (Nørgaard et al, 2021; Phillips et al, 2010; Phillips & Puschendorf, 2013)).…”

Section: Introductionmentioning

confidence: 99%

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Divergence in host–parasite interactions during the cane toad's invasion of Australia

Justicia

Mayer

Shine

et al. 2022

Ecology and Evolution

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Pathogens are a major source of mortality and morbidity for many species, imposing intense natural selection on the ability of hosts to detect and destroy infective organisms, but equally imposing selection on pathogens to evade defenses of the host (Papkou et al., 2016).Evolutionary theory thus predicts that parasites and their hosts are intricately co-adapted due to evolutionary "arms races" through time, whereby parasites progressively develop adaptations to overcome host defenses, and hosts develop counter-adaptations to those new

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Section: Introductionmentioning

confidence: 99%

“…Increased host resistance at range edges could also arise from additional energy allocation to immune function as a result of altered life history decisions associated with invasion (Edwards & Gordon, 2021).…”

mentioning

confidence: 99%

Divergence in host–parasite interactions during the cane toad's invasion of Australia

Justicia

Mayer

Shine

et al. 2022

Ecology and Evolution

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“…Because populations undergoing range expansion have been known to have significant reductions of prevalence and intensity of parasitic infections (i.e., parasitic escape; Macleod et al, 2010; Blakeslee et al, 2013; Lewicki et al, 2015), it would be relevant to know whether expanded-range populations of H. cinerea have also undergone parasite escape. Edwards and Gordon (2021) found that expanded-range populations of H. cinerea from Kentucky and Indiana have significantly reduced levels of parasitism in comparison with individuals found in historical-range localities of Kentucky. Given these results, it remains possible that H. cinerea at the edge of the species range might be expected to allocate more energy to traits related to dispersal without a direct reproductive trade-off.…”

Section: Discussionmentioning

confidence: 84%

Range Expansion and Dispersal Traits of Green Treefrogs (Hyla cinerea)

Edwards

Duncan

et al. 2023

Journal of Herpetology

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Since the 1980s, there has been rapid and ongoing hypothesized climate-related range expansion in native Green Treefrogs (Hyla cinerea) northward and eastward in Illinois, Kentucky, and Indiana, United States. Because anuran leg length is positively correlated with locomotor function, longer legs have been shown to facilitate dispersal of invasive anuran populations undergoing biological invasion. These recent range-expansion populations of H. cinerea provide an ideal opportunity to test if a native frog species exhibits similar changes in dispersal-related traits to those found in invasive species. We tested if individuals on the front end of this expansion exhibit significant differences in femur length when compared with frogs collected from the historical-range distribution. We predicted that frogs found at the expansion edge would have longer femur lengths than their counterparts located in historical parts of the range. We found that relative to snout–vent length (SVL), the femur lengths (FL) of H. cinerea from expanded ranges were on average significantly larger than those of frogs from the historical range. This suggests that native expanded-range populations of this species have undergone changes in FL. Rapid shifts in morphological traits of a native species, H. cinerea, in expanded-range populations, appear to mimic morphological trade-offs observed for invasive species of anurans.

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