Abstract
Understanding the process of penetration and distribution of the invasive speciesSinanodonta woodianais important for predicting associated changes in biodiversity and the structure of freshwater communities. The biomass, density, age and sex structure of mollusk populations were analyzed. An increase in the size of Chinese pond mussels was noted after the introduction: the shell length of individuals from a pond (Romanivka village, 2017) was 24,2% more than of mollusks from the Velyka Repida river (Matroska village, 2004), and in 2019 it increased by another 14,7% (by 42,5% compared to the shell length of the mollusks from the Velyka Repida river). The body weight ofS. woodianafrom the river was 125,3 g, while in the pond there was a 2,13-fold increase in body weight in 2017, with a further increase in this indicator by another 23,6% in 2019 and another 37,7% in 2020. The relative number ofS. woodianaand native speciesUnio pictorumandAnodonta anatinain 2017 was 26,3%, 47,4% and 26,3%, in 2020 – 64,0%, 16,0% and 20,0% respectively. Ciliates of the genusConchophthirusandTrichodina,Aspidogaster conchicola,Helobdella stagnalis, larvae ofChironomussp. are in a symbiotic relationship withS. woodiana. The most commonConchophthirussp. – in 21,6% of individuals. Further spread ofS. woodianato the cold regions of Ukraine and the formation of new populations in the already developed regions should be expected.
Highlights
There is a problem of colonization of territories by invasive species in many countries these days
Our study aimed to study the structure of populations of the species S. woodiana introduced into the water bodies of Ukraine and its symbiotic relationship with local species of freshwater fauna of Ukraine
It was determined that even significant climatic differences between the invasive part of areas and the native part do not create a barrier for the spread of S. woodiana
Summary
There is a problem of colonization of territories by invasive species in many countries these days. An invasive species has a direct impact, entering into a relationship of interspecific competition with local species for resources of the same type As a result, it can suppress or completely displace native species, which leads to a simplification of the structure of the community and a decrease in its resistance to external influences. An invasive species can bring its symbionts from their native range, where they were originally distributed, and can acquire local symbionts in a new range [1,2,3,4,5] Penetrating new regions, it enters into relationships with local species, negatively affecting the size and structure of their populations, resulting in a reduction in natural biodiversity
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