Recreational potential of the Silinka River basin (Khabarovsk region)

Природные рекреационные ресурсы являются основой для развития туристской деятельности в регионе. Обычно они рассматриваются по административным единицам (краям, областям, муниципалитетам). Для небольших территорий удобнее изучать их в рамках речных бассейнов, где реки и другие водотоки являются связующим звеном между различными ресурсами и видами антропогенной деятельности. На примере р. Силинка рассмотрен рекреационный потенциал такого бассейна. Описаны основные рекреационные объекты исследуемой территории, которые объединены в три группы – горнолыжного, пешеходного туризма и пляжного отдыха. Для объекта каждой группы по единой методике проведена оценка благоприятности его рекреационного использования. Транспортная доступность каждого объекта оценивалась по средним затратам времени на передвижение на транспорте с учетом его скорости. Проведена сравнительная комплексная оценка аттрактивности рекреационных объектов с учетом эстетической оценки по параметрам контрастности, мозаичности, видового разнообразия, уникальности, экзотичности и комфортности. Также учитывались ценностные качества природных объектов (уникальность, типичность, экзотичность). Намечены перспективные виды туризма для бассейна р. Силинка. The outdoor recreational resources provide a basis for development of the tourist activity in the region. Commonly, they are considered based on the administrative units (Krais, Oblasts, municipalities). For small territories, it is handier to study them within the frameworks of the river basins where the rivers and other watercourses are the connecting links between the different resources and kinds of anthropogenic activity. By the example of Sikinka River, the recreation potential of such basin is considered. The basic recreation objects of the territory under study which are combined in three groups (mountain skiing, trekking and beach recreation) are described. For the object in each group, the assessment of favorableness of its recreation use was performed under a common methodology. The transport accessibility of each object was estimated by the average time expenditure for moving in transport with the consideration of its speed. The comparative comprehensive assessment of the attractiveness of the recreation objects was carried out with consideration of the aesthetic evaluation by parameters of contrast, mosaic structure, species diversity, unique character, exoticism and comfort. The value qualities of natural objects (unique character, typicality and exoticism) were also taken into consideration. The advanced kinds of tourism were laid down for the Silinka River basin.

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POPULATION STRUCTURE AND GENE FLOW IN THE SHEEPNOSE MUSSEL (PLETHOBASUS CYPHYUS) AND THEIR IMPLICATIONS FOR CONSERVATION

10.22541/au.162677287.70798216/v1 ◽

2021 ◽

Author(s):

Kevin Roe ◽

Sara Schwarz

Keyword(s):

Genetic Diversity ◽

Population Structure ◽

River Basin ◽

Mississippi River ◽

Population Expansion ◽

Freshwater Mussel ◽

River Basins ◽

Genetic Connectivity ◽

Anthropogenic Activity ◽

Ohio River

North American freshwater mussel species have experienced substantial range fragmentation and population reductions. These impacts have the potential to reduce genetic connectivity among populations and increase the risk of losing genetic diversity. Thirteen microsatellite loci and an 883 bp fragment of the mitochondrial ND1 gene were used to assess genetic diversity, population structure, contemporary and historical migration rates, and population size changes across the range of the Sheepnose mussel (Plethobasus cyphyus). Population structure analyses reveal five populations, three in the Upper Mississippi River Basin and two in the Ohio River Basin. Sampling locations exhibit a high degree of genetic diversity and contemporary migration estimates indicate that migration between populations within river basins is occurring, although at low rates. but no migration is occurring between the Ohio and Mississippi river basins. No evidence of bottlenecks was detected, and almost all locations exhibited the signature of population expansion. Our results indicate that although anthropogenic activity has altered the landscape across the range of the Sheepnose, these activities have yet to be reflected in losses of genetic diversity. Efforts to conserve sheepnose populations should focus on maintaining existing habitats and fostering genetic connectivity between extant demes to conserve remaining genetic diversity for future viable Sheepnose populations.

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Identification of sibling species in the genus Eucyclops from water-bodies of Ukraine and Russia using crossbreeding studies

Ecology and Noospherology ◽

10.15421/031406 ◽

2014 ◽

Vol 25 (1-2) ◽

pp. 61-68 ◽

Cited By ~ 1

Author(s):

V. I. Monchenko ◽

L. P. Gaponova ◽

V. R. Alekseev

Keyword(s):

Cryptic Species ◽

River Basin ◽

Black Sea ◽

Species Complex ◽

River Basins ◽

Water Bodies ◽

Similar Species ◽

Basin Water ◽

Different Populations ◽

Baltic Sea Basin

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

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