Fluctuating asymmetry of rodent cranial structures in an industrial pollution gradient

Yalkovskaya, L. E.; Фоминых, М. А.; Mukhacheva, S. V.; Davydova, Yu. A.; Бородин, А. В.

doi:10.1134/s1067413616030176

Cited by 10 publications

(7 citation statements)

References 20 publications

(18 reference statements)

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“…Landmarks (distinct locations for three dimensional measurements) chosen for FA analysis for vertebrate skulls often try to capture the whole shape of the skull (Oleksyk et al 2004;Urošević et al 2015;del Castillo et al 2016). Mandibles were chosen for digitization rather than the whole skull because past FA studies show that the greatest potential effects of contaminants are on mandible FA (Sánchez-Chardi et al 2013;Yalkovskaya et al 2016). As mentioned in Klingenberg (2015), structures that have object symmetry, like skulls, should possess single landmarks on the midline of the structure and paired landmarks on the left and right side of the structure to ensure the required data are gathered for the analyses.…”

Section: Methodsmentioning

confidence: 99%

“…FA studies focus on the idea that environmental stress lowers the individual's ability to mitigate the developmental variations on each side of the organism, resulting in higher asymmetry between the two sides of an organism's structure (Klingenberg 2015). For instance, studies on small mammals reported higher levels of skull FA with increased exposure to environmental contaminants (Oleksyk et al 2004;Sánchez-Chardi et al 2013;Yalkovskaya et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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No relationship between gastrointestinal parasite intensities or mercury burdens on fluctuating asymmetry in Common Eider (<i>Somateria mollissima</i>) mandibles

Scobie

Panopi²,

Bayne³

et al. 2020

Can Field Nat

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Mercury (Hg) emissions have increased since 1950 and biomagnification in Arctic ecosystems can affect animals, particularly at higher trophic levels. Exposure to Hg can negatively affect young developing animals, resulting in altered morphology and ultimately, lower fitness. We examined the relationship of mandible fluctuating asymmetry (FA) with gastrointestinal helminth intensity and breast muscle Hg concentration in Common Eider (Somateria mollissima borealis). Procrustes analysis of variance indicated significant FA but relatively high measurement error. Based on multiple linear regression modelling, there was no significant relationship between FA and Hg concentration or parasite burden. There may be a mismatch in trying to relate amount of Hg and parasite intensity in adults to FA that would have occurred early in life during skeletal development.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

No relationship between gastrointestinal parasite intensities or mercury burdens on fluctuating asymmetry in Common Eider (<i>Somateria mollissima</i>) mandibles

Scobie

Panopi²,

Bayne³

et al. 2020

Can Field Nat

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show abstract

“…Laboratory-based studies delivered important knowledge regarding relations between magnitude/pattern of variation among and within individuals and environmental [ 27 – 30 ] or genetic [ 18 , 31 – 34 ] factors, relationships between patterns of Ind and FA as evidence of whether the same developmental mechanisms generate canalization and DS [ 21 ], ontogenetic changes in magnitude of variation and covariance structure among individuals [ 23 – 25 , 35 – 37 ], and genetic architecture of FA [ 38 ]. Considering studies that involved specimens from wild rodent populations, the majority of them investigated associations between FA levels of meristic [ 39 , 40 ] and metric [ 41 – 47 ] mandibular and cranial characteristics with environmental and genetic perturbations, while few of them compared patterns between Ind and FA to infer whether developmental mechanisms behind canalization and DS are closely related [ 45 , 48 , 49 ]. Moreover, examinations of parasite (viral) infections effects on host (rodents from wild populations) morphology found that viruses can disrupt host development affecting mean cranial shape and canalization [ 50 , 51 ].…”

Section: Introductionmentioning

confidence: 99%

Canalization and developmental stability of the yellow-necked mouse (Apodemus flavicollis) mandible and cranium related to age and nematode parasitism

Jojić

Čabrilo

et al. 2021

Front Zool

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Background Mammalian mandible and cranium are well-established model systems for studying canalization and developmental stability (DS) as two elements of developmental homeostasis. Nematode infections are usually acquired in early life and increase in intensity with age, while canalization and DS of rodent skulls could vary through late postnatal ontogeny. We aimed to estimate magnitudes and describe patterns of mandibular and cranial canalization and DS related to age and parasite intensity (diversity) in adult yellow-necked mice (Apodemus flavicollis). Results We found the absence of age-related changes in the levels of canalization for mandibular and cranial size and DS for mandibular size. However, individual measures of mandibular and cranial shape variance increased, while individual measures of mandibular shape fluctuating asymmetry (FA) decreased with age. We detected mandibular and cranial shape changes during postnatal ontogeny, but revealed no age-related dynamics of their covariance structure among and within individuals. Categories regarding parasitism differed in the level of canalization for cranial size and the level of DS for cranial shape. We observed differences in age-related dynamics of the level of canalization between non-parasitized and parasitized animals, as well as between yellow-necked mice parasitized by different number of nematode species. Likewise, individual measures of mandibular and cranial shape FA decreased with age for the mandible in the less parasitized category and increased for the cranium in the most parasitized category. Conclusions Our age-related results partly agree with previous findings. However, no rodent study so far has explored age-related changes in the magnitude of FA for mandibular size or mandibular and cranial FA covariance structure. This is the first study dealing with the nematode parasitism-related canalization and DS in rodents. We showed that nematode parasitism does not affect mandibular and cranial shape variation and covariance structure among and within individuals. However, parasite intensity (diversity) is related to ontogenetic dynamics of the levels of canalization and DS. Overall, additional studies on animals from natural populations are required before drawing some general conclusions.

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“…Morphological assessment of the state of living organisms which is based on fluctuating asymmetry is one of the commonly used methods for ecological monitoring by both national and foreign scientists (Zakharov, 1987;Gileva & Kosareva, 1994;Zakharov et al, 2000;Gileva & Nokhrin, 2001;Vasil'ev, 2005;Gileva et al, 2007;Vasil'eva et al, 2003;Yalkovskaya et al, 2016;Pankakoski et al, 1992;Markowski, 1993;Graham et al, 2000;Oleksyk et al, 2004;Veličković, 2004;Vishalakshi & Singh, 2008;Allenbach, 2011;Coda et al, 2016Coda et al, , 2017Benítez et al, 2018). The assessment of the state of animal populations is essential in itself as a parameter of biodiversity (Ryadinskaya & Kokhonov, 2016).…”

Section: Introductionmentioning

confidence: 99%

Differentiation degree and developmental stability of Chionomys gud (Rodentia: Cricetidae) by nonmetric cranial traits

Tembotova¹,

Amshokova²,

Kononenko³

2020

Nat. Conserv. Res.

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The work describes the results of assessing developmental stability and the degree of differentiation in Chionomys gud within Protected Areas of the Central and Western Caucasus. We characterised developmental stability in Chionomys gud in different eco-geographical conditions by means of fluctuating asymmetry levels (FA nm) in a series of cranium phenes in four geographical populations. Thus we estimated the effect of environmental factors on FA nm levels. We registered the highest FA nm value for the sample from middle mountains of the Central Caucasus, i.e. the vicinities of the village Elbrus. The environment conditions of the given sample were the most stressful for the species (annual average temperature below 5°C and annual average precipitation below 1000 mm). Two-way ANOVA for factors «annual average temperature» and «annual average precipitation» verified a correlation between FA nm levels and complex effects of the two climatic factors. We evaluated the levels of interpopulation phenetic distances by the analysis of frequencies of phenes of nonmetric cranial traits in Chionomys gud populations. Maximum phenetic distances were revealed between geographically distant (over 300 km) populations of the Central and Western Caucasus. The degree of morphological differentiation of the samples from the Central Caucasus, which are apart at the absolute distance of 20-60 km, was less pronounced. Our results suggest that the level of phenetic distances is determined not only by the effect of territorial isolation, but also by climatic peculiarities of a particular locality.

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Fluctuating asymmetry of rodent cranial structures in an industrial pollution gradient

Cited by 10 publications

References 20 publications

No relationship between gastrointestinal parasite intensities or mercury burdens on fluctuating asymmetry in Common Eider (<i>Somateria mollissima</i>) mandibles

No relationship between gastrointestinal parasite intensities or mercury burdens on fluctuating asymmetry in Common Eider (<i>Somateria mollissima</i>) mandibles

Canalization and developmental stability of the yellow-necked mouse (Apodemus flavicollis) mandible and cranium related to age and nematode parasitism

Differentiation degree and developmental stability of Chionomys gud (Rodentia: Cricetidae) by nonmetric cranial traits

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