Ключевое слово: «ecosystem»

Ecological monitoring of aquatic ecosystems provides valuable information on their condition under the changing level of anthropogenic load and in connection with the intensifying impact of climate warming on the territory of continuous permafrost distribution. Water quality monitoring (in particular, pH, electric conductivity, color, concentration of ions and level of nutrients) gives an idea of changes in the condition of a water body depending on the level of its pollution. In water bodies pollutants slowly settle to the bottom and accumulate in sediments. Therefore, the bottom sediments can be used to trace changes in the state of the environment in different periods of time. The article contains up-to-date information on the current state of lake ecosystems in the Me-gino-Kangalassky ulus. The new limnological, hydrochemical characteristics and composition of diatomic algae complement the existing database on Yakutia.

Forest fires are a powerful environmental factor affecting the development of forest biogeocenoses in many ways. In difficult conditions in the north, forest fires have a negative impact on forest ecosystems. They destroy the soil layer, contribute to the development of severe erosion and release pollutants into the atmosphere. Forest fires have a great negative impact on forest ecosystems with low rehabilitation potential, which include forests of Yakutia growing in permafrost areas. As a result of fires, numerous negative substances (CO2, CO, CH4, NOx) and smoke particles (solid aerosols) enter the atmosphere, which affect the physico-chemical processes in the atmosphere, regulate the radiation balance and affect the climate.

The article examines the problem of environmental pollution by pharmaceutical waste, highlights the growing consumption of medicines and the lack of attention to their environmental impact. The main sources of pollution, such as wastewater, landfills and agricultural complexes, are analyzed, as well as their effects on ecosystems, including effects on animals and impaired reproductive functions. Emphasis is placed on the necessity for a holistic strategy in addressing the issue, which encompasses enhancing regulatory frameworks, creating efficient methods for waste management and purification, as well as elevating the level of community knowledge. The article suggests possible solutions, such as the separation of pharmaceutical waste according to the degree of danger, their processing into building materials and the use of bacteria for the decomposition of medicinal substances.

This article is devoted to the study of one of the valuable and rare subspecies of freshwater fish – Yakutian crucian carp (Carassius gibelio).The literature of various authors and researchers on this issue has been analyzed. The crucian carp is a fish with high adaptability to various environmental conditions, which makes it an important object for both scientific research and aquaculture.