A survey of the macrozoobenthos communities in the Maritsa River (South Bulgaria) was carried out in the summer of 2021. Benthic samples were collected and physicochemical parameters (water temperature, pH, conductivity, dissolved oxygen and nutrients) were measured at 15 sites located on the main river and its tributary system. The studied sites belonged to different river types and characterised the diversity of the ecological conditions—from unaffected to anthropogenically influenced river stretches. In addition, data from a study conducted in the summer of 2020 were used to analyse species–factor interactions in the river ecosystems and to assess the bio-indicative potential of the aquatic invertebrates. The dynamics of the taxonomic composition and abundance of the macrozoobenthos were analysed in relation to environmental factors. The physicochemical conditions of the water environment changed during the period of high water, which led to a reduction in the composition of the macrozoobenthos. Plecoptera and Trichoptera decreased in richness and abundance downstream and under human impacts. Ephemeroptera and Chironomidae were permanently present along the whole river. Oligochaeta increased in the lower river reaches and at sites with a greater amount of organic matter. The ecological status determined by the macrozoobenthos varied from high (site 1) to good, moderate and bad (site 13) at the studied sites.

The city of Blagoevgrad and its surroundings (about 16.4 km2) were researched in order to establish the diversity, distribution and level of synanthropy of the amphibian and reptile species. Data about the herpetofauna were obtained in the period 1988–2012. Totally 25 species were registered – 10 amphibians and 15 reptiles. The number of species, discovered around the city, was 23, and 6 of them were not found within the administrative boundaries of the city. The different urban zones are inhabited by 19 species. They represent 37% of the amphibians and 31% of the reptiles, found in Bulgaria, and 64% of the amphibians and 60% of the reptiles, distributed in the Blagoevgrad municipality, which is very high species richness. The herpetofauna has found quite favourable conditions in the territory of the city as a whole, and especially in the sparsely populated and built up areas and city periphery. The presence of great variety of urban habitats and the pattern of situation of the city residential districts are very important for the successful adaptation of herpetofauna for inhabiting in urban environment. The high species richness could be explained also by the fact, that comparatively great number of amphibians and reptiles are hemerodiaphoric species, which easily exist in landscapes, transformed by man. The results from the case study of the herpetofauna in Blagoevgrad show that the urban areas could provide good conditions for the wild animals and could be places of substantial biological diversity

The article is devoted to the ideas of the Club of Rome and their modern reading. The Club of Rome, founded in 1968, is an international society of politicians, business leaders, and scientists, who appeal for mutual tolerance, understanding, and solidarity in relation to the real problems of the world, and the environmental problems in the first place. The members of the Club prescribe the setting of limits to human expansion over nature, which is explained with superfluous “anthropocentric confidence”, after the words of the foundation member Aurelio Peccei. Recently, these ideas of the Club of Rome have been criticized by economists, philosophers, and politicians, being described as “environmental alarmism”, i.e. as groundless alarm relevant to incorrect notions about the inevitability of ecological crisis and its devastating consequences for humanity. However the global environmental crisis is already an undeniable fact and requires a thorough study of the ethical standards of the human behaviour, which are often rooted in moral phenomena such as consumerism, irresponsibility, insensitivity or even selfishness. Nature cannot be only considered as a source of natural resources or benefits to people. The moral motive of nature conservation, despite the power of modern science, is one of the main ideas of the founders and followers of the case of the Club of Rome. It concerns the future where the respect for the value of nature is a new moral principle.

The article is an attempt to review some basic ethical concepts in their historical and substantive development, within the context of the environment and environmental knowledge. It also tries to answer the question whether there is a difference between traditional and environmental ethics. The comparative-historical method is used, which considers some classical ethical concepts and their interpretations related to the environment. The concepts of classical and modern scientists are also analyzed. The authors consider whether these concepts should be supplemented with new content in this area or should be reformulated in terms of moral relevance not only for the human community, but also for all non-human inhabitants of the environment. The article explores issues about the origin of morality, as well as some ideas about the moral status of attitudes among primates. More important conclusions are that ethics and environmental knowledge must be developed in cooperation in order to explain and form moral consciousness, a new type of ethos that does not allow indifference to the environment in human interaction with it, and that moral considerations should contain not only prescriptions for due human behavior in human society, but also obligations to non-human inhabitants of nature or to the environment.

Lizards in Bulgaria hibernate in winter. Yet, individuals of many species were found active in this period. Cases of winter activity of Podarcis muralis and P. erhardii in the country have been published, but this behavior has not been studied in detail. The purpose of this research was to observe and analyze the winter activity of these two species in the city of Blagoevgrad. The observations took place at two sites in days with high solar radiation in December, January, and February 2015–2017. One of the sites was a typical urban territory, inhabited only by P. muralis. The other site was a suburban area, inhabited by P. erhardii. The number of the active individuals of the Common Wall Lizard recorded was about 8.5 times higher than that of the Erhard's Wall Lizard. The lowest air temperature at which P. muralis was observed was -4°C and for P. erhardii it was +0.5°C. Individuals of both species were registered only at positive substrate temperatures. Representatives of all age groups of P. muralis were recorded often with dorsoventrally flattened bodies while basking. On the other hand, few juveniles of P. erhardii were found active and they flattened their bodies very rarely.