Search Results

1 - 5 of 5 items

  • Author: O. D. Nekrasova x
Clear All Modify Search
Current Distribution of the Introduced Rock Lizards of the Darevskia (Saxicola) Complex (Sauria, Lacertidae, Darevskia) in Zhytomyr Region (Ukraine)

Abstract

In the autumn of 2015 current distribution of the lizards of Darevskia (saxicola) complex, introduced in 1960s in Zhytomyr administrative region of Ukraine was studied. During the period from introduction until now Darevskia (saxicola) complex has spread along the left bank of the Teteriv River on the territory about 3.7 km lengths. Beside this was found an isolated population of this species, which located about at 4 km direct distance or 8.5 km shore line distance from the main area of occurring this species. It is supposed that this secondary introduction took place occasionally or intentionally due to holidaymakers (e. g. climbers, fishermen). The publication provides description of the lizards on 15 morphological characteristics and information on the results of spatial modeling potential distribution the rock lizards.

Open access
A Review Of Major Impact Factors Of Hostilities Influencing Biodiversity In The Eastern Ukraine (Modeled On Selected Animal Species)

Abstract

We identified major factors (both direct and indirect), caused by the hostilities in Ukrainian ATO zone that adversely influence local biodiversity and environment. Damaged conservational territories (objects of nature conservation fund) were assessed. One of the most severe factors, the fires were studied using data from Terra MODIS remote sensing, resulting in a model of localization and spatial configuration of fires on natural and agricultural territories in ATO zone during June-September 2014. In that period, 2901 ignitions were registered in ATO zone, exceeding the numbers for previous four years. It was determined that 81 % of all of the ignitions happened on natural steppe and forest areas, 19 % in settlements. Th e fires damaged 18 % of forest area, 23 % of the steppe area and 14 % of arable lands of ATO zone. For two snake species of Red book of Ukraine — eastern Elaphe dione and more widespread Hierophis caspius — it was shown that most of the animals and their biotopes in Luhansk and Donetsk Regions of Ukraine are under threat. Far example, 65–82 % of 108 finds of these Colubridae registered in the eastern Ukraine are located in the ATO zone and near to hostilities. GIS models also showed that more than 50 % of biotopes, suitable for these snakes, are in the ATO zone or near it. Based on world-wide experience and our own observations, we safely assume that the events of 2014 in the ATO territory can possibly cause far-reaching adverse consequences for natural landscapes, local flora and fauna, and the massive local disappearance of plant and animal populations.

Open access
Histological Changes in Common Toad, Bufo Bufo (Anura, Bufonidae), Liver Tissue Under Conditions of Anthropogenically Transformed Ecosystems

Abstract

In the article the histological changes in the liver of the common toad, Bufo bufo (Linnaeus, 1758), under conditions of moderate anthropogenic pollution (a vast park surrounded by urban areas) are examined. In the liver parenchyma, numerous changes characteristic of toxic damage were found: hepatocyte necrosis, fatty dystrophy, protein (and hydropic) dystrophy, signs of infl ammation. An analysis of the number of pigment inclusions in the liver shows hyperpigmentation in some specimens and hypopigmentation in others. The presence of hyperpigmentation indicates a moderate degree of damage and activation of compensation processes in animals. This is confirmed by a large population of common toads in this biotope. It is concluded that in anthropogenically modified biotopes some deterioration of animal health can be compensated by the absence of predators and the reduction of food competition.

Open access
Color Features of Sand Lizards, Lacerta Agilis (Sauria, Lacertidae), in Kyiv Region (Ukraine)

Abstract

The article describes the study of distribution and morphological features of different morphotypes of sand lizards (Lacerta agilis) of the Kyiv Region. To sum up, 5 morphotypes of L. a. chersonensis were found in the Kyiv Region: bilinear (61.9 %); intermediate form (intermediate version) (17.3 %); trilinear (3.2 %); var. erythro-(viridi-)nota (16.2 %); and the rarest var. con-(bi-)color (1.4 %). According to the morphological features’ varieties erythro-(viridi-)nota lizards differ mostly from all other morphs (Na/Lor)(2/1 — 44.4 %), in the 15–17 rows 18(14–23) scales. They are most oft en found in forest biotopes. The remaining bi- and trilinears are characterized by Na/Lor (1/1 — 50.9 %), in the 15–17 rows 9.5 (6–13) scales.

Open access
Changes in the Nothern Border of the Home Range of the Dice Snake, Natrix Tessellata (Reptilia, Colubridae), in the Dnipro Basin (Ukraine)

Abstract

A new distribution boundary of the dice snake, Natrix tessellate (Laurenti, 1768), in Ukraine has been established. The northern edge currently lies within the valley of the middle course of the Dnipro River: Trakhtemyriv Peninsula, Cherkasy Region on the right side (49°59′ N, 31°25′ E); on the left side in Kyiv Region within Pereyaslav-Khmelnytsky District: at a fishermen’s station (50°02' N, 31°17' E), yacht club (Kurinoye Estuary 50°02′ N, 31°29′ E); Lubny, Poltava Region (49°58 N, 33°01′ E). These points are located 70-80 km northwards from the previous boundary of the species home range. The level of Natrix tessellata population polymorphism in the North of Cherkasy Region is high; more than 40 % of specimens are dark-colored.

Open access