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В работе представлены результаты исследований заселения сухопутными моллюсками разных биотопов в зависимости от рельефных особенностей местности и зараженность моллюсков личинками легочных нематод. В условиях Чеченской Республики в горном поясе моллюски, промежуточные хозяевам нематод Protostrongylidae,насчитывает 18 видов. Наименьший процент зараженных моллюсков личинками Protostrongylus spp.установлено в субнивальном поясе 17 (5,6%). Интенсивная плотность заселения на пастбищах горного пояса у моллюсков отмечается у мезоксерофилл, мезобионтов, гигрофил и зависит от размещения и типа биотопов. Наиболее сильную зараженность личинками гельминтов оказалось у моллюсков, собранных у сельских пастбищ, личинкам Protostronqylidae 867 (52,8), личинками Protostrongylus spp. 564 (34,4%)., The paper presents the results of studies of the population of land mollusks of different biotopes, depending on the relief features of the area and the infestation of mollusks with larvae of pulmonary nematodes. In the conditions of the Chechen Republic in the mountain belt, mollusks intermediate to the hosts of the nematodes Protostrongylidae number 18 species. The lowest percentage of shellfish infected with the larvae of Protostrongylus spp. it is found in the subnival zone 17 (5.6%). Intense population density on the grasslands of the mountain belt in molluscs is noted in mesoxerophyte, mesobiota, hygrophila and depends on the placement and type of biotopes. The most severe infection with helminth larvae was found in mollusks collected from rural pastures, Protostronqylidaelarvae 867 (52.8), Protostrongylus spp. 564 (34.4%). (8-10 lines), Горное сельское хозяйство, Выпуск 1 2021

Background Late in the 1990s, the non-indigenous European green crab (Carcinus maenas) colonized the shorelines of eastern Prince Edward Island, in Atlantic Canada. Due to concerns of further spread into productive shellfish habitats, an annual survey was conducted between 2000 and 2013 to detect a potential range expansion of this species. We compiled and analyzed that data and document green crab expansion using records of annual occurrence and relative density. Methods Surveys were conducted during the fall season of each year by deploying baited traps at 29 sites along the island’s two main shorelines (north and south shores). These sites were selected based on areas deemed more likely to be invaded by the green crab. Raw data per site and date was transformed to catch per unit effort (CPUE) to estimate relative abundances. Results Populations of this species showed an uneven westward expansion along the north and south shores. Expansion rates changed among years but, overall, crab abundance was higher and changes in abundance were faster along the south shore than the north shore of the island. The westward expansion continues until this day. Conclusions Based on the information compiled we hypothesize that the dissimilarity in range expansion rate was related to the availability of suitable habitat to sustain large green crab populations along the south shore. We also discuss implications of this expansion for commercial shellfish and native coastal communities.