scholarly journals Modeling Sexual Differences of Body Size Variation in Ground Beetles in Geographical Gradient (The Case Study in Pterostichus oblongopunctatus Fabricius, 1787)

2020 ◽  
Author(s):  
Raisa Sukhodolskaya ◽  
Anatoliy Saveliev ◽  
Nadezhda Ukhova ◽  
Iraida Vorobyova ◽  
Igor Solodovnikov ◽  
...  
Keyword(s):  
Body Size ◽  
Sexual Size Dimorphism ◽  
Ground Beetle ◽  
Size Variation ◽  
Ground Beetles ◽  
Mean Values ◽  
Size Dimorphism ◽  
Body Size Variation ◽  
Pterostichus Oblongopunctatus

Concretizing the mechanisms of Bergmann rule, we found saw-tooth pattern in body size variation in ground beetle Pterostichus oblongopunctatus. We sampled beetles in 2010 – 2018 at the forest undisturbed plots on the broad territory in Russia. Investigating regions covered territory, extending to 3 degrees latitude and 19 degrees longitude. We measured six traits in every of 3294 caught individual. ANOVA showed that latitude, and sex affected significantly body size of the species studied. Mean values of each trait changed significantly from one studied region to another in females and males as well. Sexual size dimorphism in species was female-biased. We performed models in R to estimate the steepness of body size variation in both sexes. In overwhelming majority of cases that parameter was equal in both sexes. So the hypothesis, that male′s variation is steeper in latitude gradient was not confirmed.

scholarly journals Modeling sexual differences of body size variation in ground beetles in geographical gradient (The case study in Pterostichus oblongpunctatus Fabricius, 1787)

2020 ◽  
Vol 13 (3) ◽  
pp. 149-161
Author(s):  
Raisa A Sukhodolskaya ◽  
Anatoly A Saveliev ◽  
Nadezhda L Ukhova ◽  
Iraida G Vorobyova ◽  
Igor A Solodovnikov ◽  
...  
Keyword(s):  
Body Size ◽  
Sexual Size Dimorphism ◽  
Ground Beetle ◽  
Geographical Location ◽  
Size Variation ◽  
Ground Beetles ◽  
Mean Values ◽  
Size Dimorphism ◽  
Body Size Variation

Fleshing out the mechanisms of Bergmann rule, we found saw-tooth pattern in body size variation in ground beetle Pterostichus oblongopunctatus. We sampled beetles in 2010 – 2018 at the forest undisturbed plots on the broad territory in Russia and Belarus. Investigating regions covered territory, extending to 3 degrees latitude and 31 degrees longitude. We measured six traits in every of 3294 caught individuals. ANOVA showed that geographical location and sex affected significantly body size of the species studied. Mean values of each trait changed significantly from one studied region to another in females and males as well. Sexual size dimorphism in species was female-biased. We performed models in R to estimate the steepness of body size variation in both sexes. In overwhelming majority of cases that parameter was equal in both sexes. So the hypothesis, that male′s variation is steeper in latitude gradient was not confirmed.

Geographic variation in body size and sexual size dimorphism of North American Ratsnakes (Pantherophis spp. s.l.)

2018 ◽  
Vol 96 (11) ◽  
pp. 1196-1202 ◽  
Author(s):  
Brett A. DeGregorio ◽  
Gabriel Blouin-Demers ◽  
Gerardo L.F. Carfagno ◽  
J. Whitfield Gibbons ◽  
Stephen J. Mullin ◽  
...  
Keyword(s):  
Body Size ◽  
Large Scale ◽  
Sexual Size Dimorphism ◽  
Size Variation ◽  
Sexually Dimorphic ◽  
Male Body ◽  
Complex Species ◽  
Size Dimorphism ◽  
Body Size Variation ◽  
Female Body Size

Because body size affects nearly all facets of an organism’s life history, ecologists have long been interested in large-scale patterns of body-size variation, as well as why those large-scale patterns often differ between sexes. We explored body-size variation across the range of the sexually dimorphic Ratsnake complex (species of the genus Pantherophis Fitzinger, 1843 s.l.; formerly Elaphe obsoleta (Say in James, 1823)) in North America. We specifically explored whether variation in body size followed latitudinal patterns or varied with climatic variables. We found that body size did not conform to a climatic or latitudinal gradient, but instead, some of the populations with the largest snakes occurred near the core of the geographic range and some with the smallest occurred near the northern, western, and southern peripheries of the range. Males averaged 14% larger than females, although the degree of sexual size dimorphism varied between populations (range: 2%–25%). There was a weak trend for male body size to change in relation to temperature, whereas female body size did not. Our results indicate that relationships between climate and an ectotherm’s body size are more complicated than linear latitudinal clines and likely differ for males and females.

scholarly journals Body size variation and sexual size dimorphism across climatic gradients in the widespread treefrogScinax fuscovarius(Anura, Hylidae)

2017 ◽  
Vol 43 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Javier Goldberg ◽  
Darío Cardozo ◽  
Francisco Brusquetti ◽  
Diego Bueno Villafañe ◽  
Andrea Caballero Gini ◽  
...  
Keyword(s):  
Body Size ◽  
Sexual Size Dimorphism ◽  
Size Variation ◽  
Size Dimorphism ◽  
Body Size Variation

scholarly journals Modeling Sexual Differences of Body Size Variation in Ground Beetles in Geographical Gradients: A Case Study of Pterostichus melanarius (Illiger, 1798) (Coleoptera, Carabidae)

Life ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 112
Author(s):  
Sergey Luzyanin ◽  
Anatoly Saveliev ◽  
Nadezhda Ukhova ◽  
Iraida Vorobyova ◽  
Igor Solodovnikov ◽  
...  
Keyword(s):  
Body Size ◽  
Ground Beetle ◽  
Size Variation ◽  
Trait Variation ◽  
Data Set ◽  
Body Size Variation ◽  
Regression Curves ◽  
Length Increase ◽  
Pterostichus Melanarius

The aim of this study was to test the steepness of body size variation in males and females in the widespread ground beetle Pterostichus melanarius in geographical gradients. Beetles were sampled in 15 regions of Europe and Asia, and sampling territories differed 17° in latitude and 121° in longitude. We measured six linear traits in every captured beetle and formed a data set that included 2154 individuals. Body size variation in all traits in general was sawtooth, both in latitude and in longitude gradients. Regression analysis showed slight trends: in the latitude gradient, elytra parameters increased, pronotum length did not change but the width increased, and head parameters decreased. In the longitude gradient, the changes were as follows: elytra length increased, but its width did not change; pronotum length did not change, but its width increased; the head parameters decreased. Thus, we observed the elytra length increase and the head parameters decrease northwards and eastwards. We compared female and male regression curves (trait size on latitude/longitude): p-levels were significant only in four cases out of 12. Thus, we conclude that, in general, there is no evidence for the steepness in trait variation in males compared with females.

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