Population Cycles and the Chitty Syndrome

Kshnyasev, I. A.; Davydova, Yu. A.

doi:10.1134/s1067413621010082

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…In fact, our analysis of factors promoting the appearance of large size individuals pointed to trapping session and phase of cycle as the main explanatory factors (Table 3 ). Our results are coincident with recent results in Russia showing that Chitty effect disappears in vole populations losing cyclicity, so it seems to be a population syndrome clearly associated to cycles 61 , but see 12 .…”

Section: Discussionsupporting

confidence: 92%

Habitat type modulates sharp body mass oscillations in cyclic common vole populations

Olea,

de Diego,

García

et al. 2024

Sci Rep

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Cyclic rodent populations exhibit pronounced changes in body mass associated with the population cycle phase, long-known as Chitty effect. Although Chitty effect is a common epiphenomenon in both America and Europe, there is still incomplete evidence about the generality of these patterns across the entire range of most species. Moreover, despite decades of research, the underlying factors driving Chitty effect remains poorly understood. Here, we examined the influence of intrinsic and extrinsic factors that may underlie observed patterns in vole size variation in the Iberian common vole Microtus arvalis asturianus. We weighed and measured 2816 adult voles that were captured during 6 trapping periods. Vole numbers and body mass showed strong period- and phase-related variation both in females and males, demonstrating marked Chitty effect in the studied population. Body mass of adult males correlated with body length, evidencing that heavier males are also structurally larger. Statistical models showed that probability of occurrence of large-sized vole (> 37 g) was significantly more likely in reproductive males, during increase and peak phases, and it was modulated by habitat, with crop fields and field margins between crops showing an increased likelihood. We suggest an effect of the habitat on vole body mass mediated by predation.

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Section: Discussionsupporting

confidence: 92%

Habitat type modulates sharp body mass oscillations in cyclic common vole populations

Olea,

de Diego,

García

et al. 2024

Sci Rep

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“…This phenomenon is most likely provoked by the higher energy requirements for growth and reproduction in this group. It should also be borne in mind, in the year of the population size peak, the 'mission' of reproductive function is assigned exclusively or mainly on the overwintered group of individuals (Kshnyasev and Davydova 2021).…”

Section: Discussionmentioning

confidence: 99%

Differentiating ability of haematological indicators: comparative blood test of sympatric rodent species of the subfamily Arvicolinae (Clethrionomys glareolus, Clethrionomys rutilus, and Craseomys rufocanus)

Orekhova¹,

Ya²,

Gy³

2021

Preprint

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Among the representatives of the subfamily Arvicolinae the interspecific differences (Clethrionomys glareolus, Clethrionomys rutilus, and Craseomys rufocanus) in the respiratory capacity of red blood and the immune status are presented in conjunction with the basal metabolic rate, the level of sociality and eurybionism, and thermoregulatory function. The degree of differentiation of voles in terms of haematological parameters has corresponded to the level of phylogenetic relationships between species. Correct conduct of interspecific comparisons of haematological parameters of voles is possible only within the same reproductive-age groups.

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“…Increases in weight and body length among populations of small mammals with cyclical dynamics (characteristic also in common voles) tend to occur during periods of high abundance, as they put their energy into the competition for resources. Conversely in phases of lower population density, the body becomes smaller and more energy is invested in reproduction, the socalled Chitty effect (Yakushov and Sheftel 2020; Kshnyasev and Davydova 2021). This provides an explanation of natural selection which may favour genotypes with high reproduction and lower competiveness at low densities and vice versa at high densities.…”

Section: Introductionmentioning

confidence: 99%

Biometric analysis of the cranial features of common vole s

Baláž,

Csákiová,

Tulis

2024

Preprint

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Although cranial bones reliably identify the features of mammals, these traits can be affected by sex, population size and seasonality. This paper biometrically analyses the cranial features of the common vole. The research sample consisted of adult (n = 134), subadult (n = 57), of western Slovakia. Overall, software based on the highlighted marks measured 29 cranial features. Significant sexual dimorphism was observed for three features in adult subjects (“WMTRR”, “AMdm” and “AMd”) and four features in subadults (“LOSD”, “WMTRR”, “LoM” and “ALLM”). Results showed a significant positive relationship between body weight and cranial size in 24 of the 29 features. They also suggested a weak but significant positive effect of cranium size on common vole abundance (Chitty effect) likewise in 24 of the 29 features. In several cases, this effect influenced also the abundance and age of the individuals.

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Population Cycles and the Chitty Syndrome

Cited by 11 publications

References 23 publications

Habitat type modulates sharp body mass oscillations in cyclic common vole populations

Habitat type modulates sharp body mass oscillations in cyclic common vole populations

Differentiating ability of haematological indicators: comparative blood test of sympatric rodent species of the subfamily Arvicolinae (Clethrionomys glareolus, Clethrionomys rutilus, and Craseomys rufocanus)

Biometric analysis of the cranial features of common vole s

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