Invasive alien species are regarded a nuisance. This extends into a lack of conservation efforts in their native range. As a consequence, conservation of e.g. range-edge populations is neglected. Gobiidae have many representatives of alien species in European freshwaters, and therefore they have a bad reputation. Objectives of this study were to: define the habitat selection patterns of a species at the edge, and examine the ontogenetic variation in its distributions, i.e. spatial distribution of different size classes. A racer goby Babka gymnotrachelus (syn. Neogobius gymnotrachelus) population was selected for the model. In numerous European river basins, Ponto-Caspian racer goby has been an invasive alien species of interest to researchers for many years. Recently, however, native populations of the species have been described in the Polish tributary of the upper Dniester River (Black Sea basin). We used habitat data and densities of racer goby to disentangle the habitat selection patterns of the species at a river reach at the edge of its native range. Evident preferences towards habitats with large submerged objects serving as hiding places were characteristic of the largest gobies. Adult, largest gobies were very likely to choose the ‘boulders’ site, while forcing smaller individuals to occupy places with faster water current, i.e. less suitable in terms of saving energy. At a larger geographic scale, a significant portion of the submountain river was unsuitable for racer gobies. At the edge of the racer goby range, patches providing habitats suitable for the species were scarce and scattered. With regard to invasive populations, the presence of stony bottoms, quite certainly cannot be considered as a factor excluding potential colonisation by racer goby, and in submountain rivers it might be the preferred kind of bottom.

Outdoor running has a positive impact on human health. Our study attempted to address the issue of what other aspects motivate people to take up running. We were particularly interested in the landscape and its significance at the stage of decision making regarding participation in races. Our goal was also to identify the landscape features of routes, which determine their popularity. We conducted surveys among running participants and spatial analyses using GIS tools. Great landscape values of running routes can contribute to the activation of a running society, especially those including women and city dwellers. The high diversity of the landscape of cross-country routes, especially in terms of their relief and land use, significantly affects their high landscape rating. Route profiles and running challenges are as important as landscape values. The landscape that runners observe during long-distance runs affects their regeneration and motivates them to finish competitions. Runs organised in mountain and foothill landscapes, characterised by a wide variety of landscapes, are particularly attractive for runners. This study illuminates how the enchanting tapestry of landscapes not only fuels the passion for outdoor running but also underscores the intricate relationship between humans and their surroundings. The results enable us to establish the key principles for designing new running routes that support runners during their exertion.