scholarly journals Variación morfométrica y geográfica entre poblaciones de Hypsiboas cordobae (Anura: Hylidae) en Argentina

2012 ◽  
Vol 4 (2) ◽  
pp. 147-155
Author(s):  
Mariana Baraquet ◽  
Pablo Raul Grenat ◽  
Nancy Edith Salas ◽  
Adolfo Ludovico Martino
Keyword(s):  
Comparative Analysis ◽  
Geographic Variation ◽  
Environmental Conditions ◽  
Positive Correlation ◽  
San Luis

Las diferencias fenotípicas intraespecíficas entre poblaciones separadasgeográficamente es común entre los anfibios anuros. En el presentetrabajo se realiza una caracterización morfométrica de Hypsiboascordobae, con el objetivo de estudiar la variación geográfica a lo largode la distribución de la especie. Se midieron 15 variables un totalde 86 individuos, pertenecientes a seis localidades de las provinciasde Córdoba y San Luís. Se observó dimorfismo sexual en diez de lasvariables. El análisis comparativo mostró diferencias significativasentre poblaciones, y el análisis discriminante mostró altos porcentajesde clasificación (87,50%). Ocho variables morfométricas mostraronrelación significativa y positiva con la latitud; mientras que diez variablesmostraron relación significativa y positica con la altitud. Sin embargo, enambos casos las correlaciones entre las distancias morfométricas y laslatitudinales/altitudinales no resultaron significativas (Test de Mantel).Esta variación geográfica en la morfometría de la especie puede debersea diferencias ambientales, o podrían deberse también a la edad de losindividuos. Por lo tanto, estos datos podían ser complementados conestudios relacionados directamente a las condiciones ambientales decada localidad, como así también estudios de esqueletocronología quepermitan determinar la edad de los individuos.ABSTRACTMorphometric differentiation and geographic variation amongpopulations of Hypsiboas cordobae (Anura: Hylidae). Intraspecificphenotypic differentiation among geographically separatedpopulations is common in anurans. We performed morphometricanalyses of the endemic frog Hypsiboas cordobae in order to assess thegeographic variation of morphometric variables along of distribution ofthe species. We measured 15 morphometric variables on 86 individualsfrom six localities of Córdoba and San Luís provinces. We foundsexual dimorphism in ten variables. The comparative analysis showedsignificant differences between populations and discriminant analysesshowed high percentages of classification (87,50%). Eight morphometricvariables showed positive correlation with latitude; and ten variablesshowed positive correlation with altitude. However, the correlationsbetween morphometric distances and latitudinal/altitudinal were notsignificant. This geographic variation in the morphometry of the speciesmay be due to environmental differences, or may be due to the age ofindividuals. Therefore, these data could be supplemented by studiesdirectly related to the environmental conditions of each locality, as wellas skeleton-chronological study to determine individual age.

Comparative analysis of productive qualities of Sables without gray hair and with different degrees of gray hair in JSC «Plemzverosovkhoz» Saltykovsky»

2020 ◽  
Vol 1 (4) ◽  
pp. 63-67
Author(s):  
N. N. Shumilina ◽  
◽  
E. E. Larina ◽  
Keyword(s):  
Comparative Analysis ◽  
Entire Range ◽  
Comparative Assessment ◽  
Positive Correlation ◽  
Gray Hair ◽  
In Captivity ◽  
Males And Females ◽  
Length And Area ◽  
Common Defect

The pride of Russia has always been sable. Sable is unique not only in the quality of its fur, but also in the fact that almost the entire range of its habitat is located on the territory of our country. It was in our country that this animal was first bred in captivity. In this regard, Russia has long had a monopoly on the production of sable skins. In 1969, the black sable breed was approved, and in 1998, the «Saltykov» type of sable was approved. JSC «Saltykovsky Breeding farm» has created a unique herd of dark Sables with evenly spaced gray hair, the skins of which are valued at auctions by 10–30% more expensive [2]. The article presents the results of a comparative assessment of the productive qualities of Sables without gray hair and with different degrees of gray created in JSC «Plemzverosovkhoz » Saltykovsky» livestock. As a result of the analysis, it was found that Sables with gray hair have higher bonitirovki scores (more than 50%). Analyzing the indicators of bonitirovki in males and females with different degrees of gray hair, it was found that the quality of pubescence and color of males with bright gray hair is significantly superior to individuals without gray hair, the same trend is observed in females. In addition, a positive correlation was found (0,79) between the weight of skins in grams, their length and area both in Sables without gray hair, and in individuals with different degrees of gray hair. The most common defect on skins without gray hair is soaking.

scholarly journals Micro-geographic variation of inversions in natural populations of Drosophila pseudoobscura

Genetika ◽  
2006 ◽  
Vol 38 (2) ◽  
pp. 97-105 ◽  
Author(s):  
Víctor Salceda ◽  
José Espinoza-Velazquez
Keyword(s):  
Geographic Variation ◽  
Population Sample ◽  
Polytene Chromosomes ◽  
Natural Populations ◽  
Chromosomal Polymorphism ◽  
Drosophila Pseudoobscura ◽  
Natural Habitats ◽  
San Luis ◽  
San Luis Potosi ◽  
San Luis Potosí

Chromosomal polymorphism for the third chromosome in Drosophila pseudoobscura has been widely studied for genetic variation in different environments or locations far apart. However, there is less information regarding sites geographically near one another. Targeting on possible micro-geographic variation in the species, a serial study was done on 12 Mexican populations grouped in four regions, including locations in Durango (DU), the border area of Guanajuato-San Luis Potosi states (GP), Chiapas (CH) and Saldilo (SA). Flies were trapped in their natural habitats using fermenting bananas as bait. They were individually cultivated in the laboratory for larvae production. In a given population sample several flies were cultivated together but only one larva per culture provided salivary tissue to observe polytene chromosomes. Gene arrangements or inversions were identified and frequencies were calculated. A total of 767 third chromosomes were studied and 11 different inversions detected. The type and relative frequencies of the arrangements varied among regions. From the 11 inversions observed, 10 were found in Durango, five in Guanajuato-San Luis Potosi and Chiapas, and eight in Saltillo. The inversion frequencies in the Durango locations varied in four cases, but only one in Chiapas, three cases in Guanajuato-San Luis Potosi, and five in Saltillo. It was also observed that there were geographical gradients for inversions within regions as follows: four arrangements in Saltillo and Durango, three in Guanajuato-San Luis Potos? and one in Chiapas. Moreover, all four regions studied showed evidences for micro-geographical variation. Nevertheless, more studies are needed to elucidate the relevance of the inversion frequencies changes in neighboring populations and also any seasonal-annual frequencies observed in the locations studied here.

Geographic variation and environmental conditions as cofactors inChlamydia psittaciassociation with ocular adnexal lymphomas: a comparison between Italian and African samples

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Alessandro Carugi ◽  
Anna Onnis ◽  
Giuseppina Antonicelli ◽  
Benedetta Rossi ◽  
Susanna Mannucci ◽  
...  
Keyword(s):  
Geographic Variation ◽  
Environmental Conditions

scholarly journals Metagenomic analyses of the late Pleistocene permafrost – additional tools for reconstruction of environmental conditions

2015 ◽  
Vol 12 (15) ◽  
pp. 12091-12119 ◽  
Author(s):  
E. Rivkina ◽  
L. Petrovskaya ◽  
T. Vishnivetskaya ◽  
K. Krivushin ◽  
L. Shmakova ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Redox Potential ◽  
Microbial Communities ◽  
Late Pleistocene ◽  
Environmental Conditions ◽  
Methanogenic Archaea ◽  
The Other ◽  
Alluvial Sediments ◽  
Geochemical Analyses ◽  
Ice Complex

Abstract. A comparative analysis of the metagenomes from two 30 000 year-old permafrost samples, one of lake-alluvial origin and the other from late Pleistocene Ice Complex sediments, revealed significant differences within microbial communities. The late Pleistocene Ice Complex sediments (which have been characterized by the absence of methane with lower values of redox-potential and Fe2+ content) showed both a low abundance of methanogenic archaea and enzymes from the carbon, nitrogen and sulfur cycles. The metagenomic and geochemical analyses described in the paper provide evidence that the formation of the late Pleistocene Ice Complex sediments likely took place under much more aerobic conditions than lake-alluvial sediments.

scholarly journals Heart Rate Variability Of Moscow Secondary Schoolboys Living In Different Environmental Conditions

2021 ◽  
Vol 265 ◽  
pp. 06005
Author(s):  
Мarya Danacheva ◽  
Viktor Glebov ◽  
Vladimir Torshin ◽  
Vasily Shevtsov ◽  
Dilyara Efremova ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Comparative Analysis ◽  
Environmental Conditions ◽  
Wave Activity ◽  
The State ◽  
Social Conditions ◽  
Adaptive Processes ◽  
Adaptation Processes ◽  
Comprehensive Study

The presented empirical study assesses the state of the cardiovascular system of Moscow schoolchildren living in different environmental conditions. 233 practically healthy schoolchildren (109 boys and 124 girls aged 11.4 to 12.6 years) took part in the comprehensive study of HRV and the state of adaptive processes when living in different ecological conditions of the capital megapolis. On the basis of different ecological and social conditions the schoolchildren were divided into 4 compared groups. The comparative analysis of the obtained HRV data of schoolchildren of different groups showed differences in the adaptation processes and in the indices of the wave activity of the sympathetic and parasympathetic departments of the ANS.

scholarly journals Bark beetles (Scolytinae) monitoring in national reserve «Kivach» forest cenosis by domestically produced pheromone traps

2021 ◽  
Vol 6 (6) ◽  
pp. 98-105
Author(s):  
A.A. Chalkin ◽  
◽  
S.N. Lyabzina ◽  
E.V. Sinitsyna ◽  
A.Yu. Lobur ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Bark Beetle ◽  
Field Trial ◽  
Bark Beetles ◽  
Ips Typographus ◽  
Pheromone Traps ◽  
Pityogenes Chalcographus ◽  
Positive Correlation ◽  
Pest Monitoring ◽  
Reserve Area

Hereafter, the results on the comparative analysis of Pityogenes chalcographus and Ips typographus monitoring by the use of pheromone traps are represented. The field trial was conducted within four different forest cenosis of the national reserve area «Kivach». The barrier funnel shaped traps with a lure attracting the bark beetle Pityogenes chalcographus and Ips typographus produced by FGBU «VNIIKR» were used for the pest monitoring in the four different cenosis. The results suggest that there is a positive correlation between the caught pest number and the type of a cenosis where the pheromone traps were installed.

scholarly journals Meadows of the Crimean Yaila

2019 ◽  
pp. 124-131
Author(s):  
A. R. Nikiforov
Keyword(s):  
Comparative Analysis ◽  
Environmental Conditions ◽  
Meadow Steppe ◽  
Vegetation Composition ◽  
Karst Depression ◽  
Karst Sinkhole ◽  
Steppe Community

A comparative analysis of the vegetation composition in the meadow steppe community and the meadow in the middle in a karst sinkhole was made. The appearance of the meadow, which is formed by its coenogenous elements, is contrasted with the steppe. The compositions of the elements in two neighboring coenoses are also not similar. Obviously, the examined communities have different genesis. These differences are due to environmental conditions of karst depression. Yaila meadows are here indigenous primary vegetation of azonal origin.

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