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The main aim of our experiments was to study the influence of colored light on juveniles of Carassius carassius, Perccottus glenii and Poecilia reticulata. The species of fish used for studies differ in their biotopes and feeding behavior. The results of experiments demonstrated that different species of fish can have different response to light quality. Thus crucian carp developed better by green light, rotan-by blue and green, guppy -by blue light. By red light the growth rate in all species decreased. The response in different species of fish to the light environment appears to be governed by changes in energy metabolism and hormone disproportionation.

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The paper presents data on the use of simple crown traps for studying the insect fauna. The crown trap is a five-litre plastic container with a window cut out on one side of it at a distance of 10 cm from the bottom. The height of the trap location is from 2 m to 10 m from the soil surface. Fermenting beer, various dry wines with the addition of honey, jam or sugar were used as bait. It turned out that crown traps are an effective way to study the insect fauna of the upper layers of forests. During the field seasons of 2018-2019, specimens of the following 12 insect orders were caught in crown traps: Blattoptera,

Дается обзор десяти видов насекомых Мордовского заповедника из списка объектов животного мира 2-го издания Красной книги Российской Федерации. При этом три вида (Calosoma sycophanta, Сeruchus chrysomelinus, Protaetia fieberi) впервые обнаружены только в последние пять лет. С 2008 г. подтверж-дены находки многолетней давности еще для шести видов (Dytiscus latissimus, Trypocopris vernalis, Osmoderma barnabita, Protaetia speciosissima, Parnopes grandior и Parnassius apollo), и 1 вид (Lucanus cervus) пока известен только по литературным данным. Для некоторых видов приводятся данные по численности, биологии и экологии.

Protected Areas are considered as primary efforts for biodiversity conservation worldwide. However, there is a lack of data on the biodiversity and threats for most of the federal-level Russian Protected Areas, especially for invertebrates. Intensive research on invertebrate diversity in Protected Areas is highly important to obtain comprehensive knowledge for the management of natural refugia of biodiversity. In the present paper, we studied the most vulnerable component of invertebrate diversity, i.e. the Red Data Book species, in the Mordovia State Nature Reserve (European Russia). We used both new (2007-2018) and literature (1936-2006) data to obtain information on habitat preferences, year of the first record, and spatial distribution in the Protected Area for 121 invertebrate Red Data Book species known from the Mordovia State Nature Reserve. Our study demonstrated a remarkable increase in the Red Data Book invertebrate diversity as a consequence of the research intensification in the Protected Area in the last ten years. This is also related to the fact that only 1-2 records are known for a large number of species (57.9%) within the Protected Area. The highest species richness was found close to the research stations (cordons). On one hand, this highlights their significance for biodiversity research. On the other hand, it outlines the need for performing more research in less-studied areas of the Mordovia State Nature Reserve. Finally, the species currently known for Mordovia and Russia only from this Protected Area (27 and four species, respectively) highlight the importance of the Mordovia State Nature Reserve at regional and national levels.