Популяційна структура та ресурси черевоногого молюска Nacella concinna (Strebel, 1908) у прибережних водах Української антарктичної станції “Академік Вернадський”, архіпелаг Аргентинські острови, Західна Антарктика

Abstract

Berezkina A.Ye. Population structure and resources of the gastropod mollusk Nacella concinna (Strebel, 1908) in the coastal waters of the Ukrainian Antarctic Station "Academik Vernadsky", Argentine Islands archipelago, West Antarctica. Qualification scholarly paper: a manuscript. Thesis submitted for obtaining the Doctor of Philosophy degree in Biology, Speciality 091 – Biology (09 – Biology). – V. N. Karazin Kharkiv National University, Ministry of Education and Science of Ukraine, Kharkiv, 2021. The thesis is dedicated to new data on the population structure of the gastropod mollusk N. concinna for the entire island system of the Argentine Islands, West Antarctica. Patterns of limpet distribution in this water area taking into account the morphological and genetic population structure. The phylogeny of the genus Nacella and possible regions of origin and distribution are reconstructed. The role of mollusks in Antarctic ecosystems, data on resources and the possibility of its use as an environmental indicator are determined. Three morphotypes of N. concinna with different shell sculptures in the water area of the Ukrainian Antarctic Station "Academik Vernadsky" were identified. The first morphotype has a shell with a smooth glossy dark surface, the second - a classical form with clear radial ribs, the third – with concentric rings and a white top of the shell. It was found that morphotypes do not differ in morphometric parameters, do not have genetic differentiation, which indicates that the three morphotypes of N. concinna belong to the same species.