Carabus coriaceus in Leningrad region

In some places, in the Kaluga region, there are sometimes a lot of them, in some places there is no finally.You may have a similar story there.Breeding will be difficult and stressful-they have adults wintering, you can search for food with a flashlight, for example, in lime-aspen mixed forests on the slopes of floodplains of medium rivers in mid-June.They walk along paths in the evening and at night and are visible from a kilometer away..IMHO.

This post was edited by Maksim M.-09/24/2015 20: 46

In some places, in the Kaluga region, there are sometimes a lot of them, in some places there is no finally.You may have a similar story there.Breeding will be difficult and stressful-they have adults wintering, you can search for food with a flashlight, for example, in lime-aspen mixed forests on the slopes of floodplains of medium rivers in mid-June.They walk along paths in the evening and at night and are visible from a kilometer away..IMHO.

Thanks for the answer!
According to the red data book, in the northern regions of distribution, the ground beetle is found in sparse areas and on the edges of light birch forests.Periods of activity are mainly in the second half of August-early September, although some individuals may be active in the spring.As for wintering in adults, the issue is controversial.For example, according to my personal experience of keeping Carabus violaceus (judging by the description in the cc, similar in behavior to the species), adults, without wintering, live for 2 years, as in nature, just ground beetles kept without wintering, repeatedly participated in reproduction.With larvae, here, I had to mess around, but this, again - Carabus violaceus, how it will be(if it will be) with Carabus coriaceus-question.

Females definitely spend the winter here-I caught them in late April and early May...

I don't have any data about the Flax region, but to the south, in Moscow, the Moscow Region, the Tula and Kaluga regions, Carabus coriaceus is confined to old-growth broad-leaved and coniferous-broad-leaved forests along river valleys (sometimes not avoiding the adjacent birch and birch-coniferous forests). It is important to preserve fallen trunks, undisturbed litter and litter. In" park " forests, and in urban parks, where leaves are raked and dried grass is removed, it disappears (in general, it disappears first in the carabus complex when the habitat changes, but it tolerates the increased recreational load quite well if they are preserved). It is thermophilic, usually active at temperatures above 13C, which is probably why it occurs more often above floodplains (where the temperature drops sharply at night due to dew and fog, as well as due to wind), on slopes and upland parts of valleys. It often comes out at the very beginning of dusk, while it is warm, and even on cloudy but warm days. DRL and DRL+UV are coming to light (once in the Tula region, 6 individuals overcame approx. 50m from the forest to the light source on a dirt road). Both larvae and part of the adult overwinter. These wintering adults, at least in the Moscow region, make up a smaller part of the population, since the number of adults at the end of May-June is noticeably lower than that at the end of July-August. According to the literature data, the cycle is one-year; how the time shift is maintained in a part of the population is unclear. In the Moscow region, according to my observations, adults spend the winter in very deep shelters, under inversions and in soil channels near old trunks at a depth of 60-120 cm, and at 4-5C in late November-early December partially retain their mobility. They leave for wintering in late September-early October, and appear in the second half of May. In the habitats known to me in Moscow and the Moscow region, the population is quite low everywhere (1-3% of the total number of carabuses goes to vinegar traps, approximately 1 individual per 100-200 catches*day; manually usually from 0 to 2 individuals per night). In the Kaluga and Tula regions, there are places with a higher population, at least in the optimal season (late July-August) - it is possible to manually find several (up to a dozen) individuals per night. Often, to determine the presence of a species in a suitable habitat, it is effective to search in the litter at the bases of trunks and lying logs for the remains of adults, especially those characteristic of elites.

You can add on your own, based on experience-wintering individuals are almost always megazmer females, they spend the winter in dry mouse burrows, if the locality is in a storm drain, always on the extreme curbs to the forest where they live, you can find those who have fallen on their backs-they can't roll over on the asphalt,you need to collect them from morning to evening.- earlier, they dry out and are picked up by birds and street sweepers,they are caught in the soil-put a glass of 500 ml on the ground,clean the site,try not to run in the dense vegetation when the vegetation is thin..