Mykola Drohvalenko

• PhD in Biology
• V. N. Karazin Kharkiv National University

Pelophylax esculentus (genotype LR), an interspecific hybrid of P. ridibundus (genotype RR) and P. lessonae (genotype LL), is one of the most studied examples of hemiclonal hybridogenic vertebrates. In most populations, hybrids produce clonal gametes of one parental species and backcross with the other parental species, forming a new generation of...

European water frogs from the Pelophylax esculentus complex include two sexual species, P. ridibundus and P. lessonae, and their hybrids, which usually clonally transmit one of the parental species' genomes. This unique reproductive strategy allows hybrids to reproduce with one or both parental species, creating diverse population systems. Unlike m...

The chytrid Batrachochytrium dendrobatidis (Bd) is a widespread fungus causing amphibian declines across the globe. Although data on Bd occurrence in Eastern Europe are scarce, a recent species distribution model (SDM) for Bd reported that western and north-western parts of Ukraine are highly suitable to the pathogen. We verified the SDM-predicted...

The article is about the effects that war has on local populations of herpetofauna in Ukraine.

Pelophylax esculentus complex hemiclonal systems are a unique evolutionary object due to intricate mechanisms of their sustainability at genomic, gamete, and developmental levels. Chornobyl Exclusion Zone (Ukraine) presents a no less unique object of nature evolution under the unprecedented radiation impact and human pressure decrease. By measuring...

Pelophylax esculentus is an interspecies hybrid of marsh frog P. ridibundus and pool frog P. lessonae. The hybrids are usually presented by diploid and triploid forms, and coexist and crossbreed with one or both parental species in the hemiclonal population systems (HPS). Siverskyi Donets river basin is known for its diversity of HPS and was descri...

Complicated relationships between different forms of Pelophylax esculentus complex are strongly connected to their reproduction modes. Stability of the hemiclonal population systems including variety of hybrids is provided by balance between gamete production patterns and selective death of offspring portion. A direct way to study such mechanisms i...

Pelophylax esculentus is an interspecies hybrid of marsh frog P. ridibundus and pool frog P. lessonae. The hybrids are usually presented by diploid and triploid forms, and coexist and crossbreed with one or both parental species in the hemiclonal population systems (HPS). Siverskyi Donets river basin is known for its diversity of HPS and was descri...

Complicated relationships between different forms of Pelophylax esculentus complex are strongly connected to their reproduction modes. Stability of the hemiclonal population systems including variety of hybrids is provided by balance between gamete production patterns and selective death of offspring portion. A direct way to study such mechanisms i...

A part of the COI mitochondrial barcoding gene was sequenced from seven species of different taxonomical groups: Ambystoma mexicanum (Amphibia, Ambystomatidae), Darevskia lindholmi, Lacerta agilis exigua (Reptilia, Lacertidae), Erinaceus roumanicus ( Mammalia, Erinaceidae ), Macrobiotus sp. 1 and 2 (Eutardigrada, Macrobiotidae) and Cameraria ohride...

We studied composition of Pelophylax esculentus complex representatives from Iskiv pond (81 adult frogs, 7 tadpoles). We estimated ratio of triploid P. esculentus (using erythrocyte cytometry and karyological analysis) and sex proportion (by outer and inner morphological features). Adults were presented only by hybrids and only 2 of them were femal...