Gradimir Valentinov Gruychev

Gradimir Valentinov Gruychev
University of Forestry · Wildlife Management

PhD

About

33
Publications
5,846
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
93
Citations
Additional affiliations
April 2006 - present
University of Forestry
Position
  • Professor (Assistant)

Publications

Publications (33)
Article
Full-text available
We monitored the abundance of European Turtle dove in 6 forest habitats. The present study identifies two variables that can affect the breeding distribution of European Turtle dove in Sarne-na Sredna Gora Mountain. The arable land adjacent to the breeding habitats is a significant factor influencing its breeding distribution in the study area. The...
Article
Full-text available
Modern agriculture often leads to a reduction in small game species and loss of biodiversity. The study area includes MG-14 (35 T) square of the Universal Transverse Mercator (UTM). The density of hares during the study period varied between 0.7-2.7 ind./km 2. Their number reported in 2014-2015 is significantly higher than in the other years. In 20...
Article
Full-text available
The study area is a low mountain; nevertheless it has substantial biodiversity, due to its specific location, xerothermic vegetation and positive average monthly temperatures. The study was conducted in the period 2014-2020. It determinates 35 percent of the avifauna and 58 percent of the breeding birds of Sakar Mountain. This study reports two new...
Article
Full-text available
In the period 2016-2019, we monitored the presence of Turtle Doves in 153 census points within a study plot in Central South Bulgaria. The presence of singing males varied slightly throughout the study period and there was no significant difference between years. The riparian and oak forests are characterised by a greater presence of Turtle Doves t...
Article
Full-text available
We observed a new White storks' breeding site in 2014-2019 in Yundola village at 1390 m a.s.l. The first successful nesting was in 2016. The breeding pair had produced two hatchlings per year for three successive years until 2018. The nest site is new for Bulgaria.
Article
Full-text available
Releasing of hand-reared game birds is a powerful tool to increase the population size of wild birds and to lower hunting pressure on their natural populations. Survival and adaptation in the wild of farm game birds is crucial for assessing game farming efficiency. Survival rate of 36 Grey partridges released in the autumn from cages in the harsh e...
Article
Full-text available
The breeding density of the Grey Partridge in Sakar Mountain is 1.23±0.19 (1-1.53) breeding pairs/km 2. The brood size is 11.9±3.87 (3-21) ind./successful breeding pair. The breeding density of the grey partridges in the study area has been marked by peaks over several years, which are preceded by an increase in the average brood size. The reproduc...
Article
Full-text available
Nest of Hazel Grouse was found in Plana Mountain, where the species have not been reported yet. According to collected eggshell material we can claim for 9 successfully hatched chicks and one died during hatching. The vegetation in the nest site is presented by 60-70 years old Scots Pine (Pinus sylvestris L.) culture. The nest side is at 1150m a.s....
Article
Full-text available
Rock Partridge (Alectoris graeca Meisner, 1804) is endemic to Europe, occurring only in the Alps, the Apennines, Sicily and the Balkans. It is suspected to be declining moderately rapidly, particularly in the Balkans which hold a substantial proportion of the species population and range, based on a balanced assessment of the available evidence. Su...
Article
Full-text available
The aim of the study is to establish the breeding success of Rock partridge (Alectoris graeca graeca Meisner, 1804), rearing in semi natural conditions. In 2014, in the western part of Stara Planina Mountain, we built light demountable aviary for raising Rock partridge. The location of the cage falls within the natural range of the Rock partridge....
Article
Full-text available
A total of 197 road kill victims were recorded in the period November 2015-May 2017 from the new section of the Maritsa Highway in South Bulgaria. The Northern White-breasted Hedgehog (Erinaceus roumanicus Barret-Hamilton, 1900)-18.6%, n=118, Eurasian Badger (Meles meles (Linnaeus, 1758))-16.9%, n=118, Golden Jackal (Canis aureus Linnaeus, 1758)-15...
Article
Full-text available
The study reports about first artificial nesting materials and place used by breeding Black Storks (Ciconia nigra) in Southeastern Bulgaria in order to the importance of such innovations for the breeding success of bird populations. Two nests were covered with nylon as an additional layer over the mosses in the nest middle. One of these nests was b...
Article
Full-text available
The distribution and density of Coypu were researched in the downstream of the Maritsa River. Twenty-four new localities were found, twenty of them are situated along the Maritsa River. Three more new localities were found in ponds near the researched area. The average density was 3.4±2.3 (0–8 ind./9.6 km) – 0.35 ind./km. The average size of the so...
Article
Full-text available
Thirty-seven nests of Turtle Doves were found in the Sakar Mountains in 2014–2016. The average height of their situation was 5.3±1.8 (2.1–10) m. The average height of the trees-substrates was 7.9±2.5 (3–12) m. The earliest nesting was observed at the beginning of May. First laid eggs were found in the second half of May. Groups of flying juvenile T...
Article
Full-text available
A flightless female Eagle Owl Bubo bubo has survived for one year with food provided by its partner. The pair bred successfully and raised one owlet in 2015. The favourable combination of characteristics on the rocky slope nest site occupied by the pair provided the female different escape routes from potential enemies, natural protection of the ne...
Article
Full-text available
Between 2007 and 2011, the distribution and breeding density of Chukar Partridges in Bulgaria were examined. Seventy-six UTM squares of the study area were deemed as including suitable habitat for the Chukar. In 14 of them varying degrees of breeding evidence of the Chukar Partridge were observed. Confirmed breeding was found in only 6 habitats, wi...
Article
Full-text available
It was observed an appearance of antler in female Red deer (Cervus elaphus). The emergence of right antler was established in early January 2015. At that very time it was at the length of 10 cm. The antler was covered with velvet and was not changed. The hind gave birth to a normally developed female yearling in 2014. The hind was shot in November...
Conference Paper
Full-text available
Releasing of hand-reared game birds is a powerful tool to increase the population size of wild birds and to lower hunting pressure on their natural populations. Survival and adaptation in the wild of the farm game birds are crucial for assessing game farming efficiency. Survival rate of 33 grey partridges released in the autumn from cages in the ha...
Article
Full-text available
Between August 2009 and May 2010 74 Chukar Partridge (25 August to November 2009 and 49 from February to May 2010) were released. Chukar Partridges inhabit different size areas between 31.5 and 65.7 ha, but about 10 % of the area of the habitat. Birds prefer thorn bushes during the day to the other areas (χ 2 = 13.185, df = 4, p < 0.05). Data show...
Article
Full-text available
Two localities with unsuccessful breeding of Eagle Owls were found in the Kazanlak Valley (0.25 pair/100 sq. km). Mammals (41.3% by number, 47.9% by biomass) and birds (56.2% by number, 52.0% by biomass) predominated in the diet among 72 animal taxa. Most important prey species were Erinaceus roumanicus (7.4% by number, 21.3% by biomass) and Rattus...
Article
Full-text available
Survival and adaptation in the wild of the farm game birds are the most important indicators for the game breeding success. Spring release of hand-reared Common pheasants (Phasianus colchicus L., 1758) and Chukar partridges (Alectoris chukar Gray, 1830) is a powerful tool to increase the breeding potential and the growth rate of population. However...
Article
Full-text available
The Barn Owl (Tyto alba) bred in 15 UTM squares (75%, n = 20) of the Kazanlak Valley (central south Bulgaria) at 33 localities (55% confirmed, 12% probable and 33% possible breeding). Its distribution in the Valley was found to be five times larger and its population size ten times greater during our study period than previously thought. Evidence o...
Article
Parvoviruses represent the most important infectious agents that are responsible for severe to fatal disease in carnivores. This study reports the results of a 10-year molecular survey conducted on carnivores in Bulgaria (n = 344), including 262 dogs and 19 cats with gastroenteritis, and 57 hunted wild carnivores. Real-time polymerase chain reactio...
Article
Full-text available
The aim of our study was to identify the most important ecological factors influencing the breeding density of chukar partridges (Alectoris chukar) in Southeastern Bulgaria. Identified habitats were divided into two categories: 1) natural habitats with an extant population of the species, and 2) habitats in which it was absent. In each habitat, ann...
Conference Paper
The hare stock in Bulgaria has been steadily decreasing over the last decade. Despite this trend, it remains one of the most numerous indigenous game species in Bulgaria. The aim of the study is to investigate hare densities in different hunting areas in the plain habitats of the country, bellow an altitude of 600 meters. From 2010 until 2013spring...
Article
Full-text available
The aim of the study is to determine the losses after farm pheasants are released in nature. In the spring of 2011, 20 pheasants (Phasianus colchicus) were tagged with radiotelemetry transmitters. Only 20% of the birds survived until the end of the study. The main reason for the losses was carnivorous mammals. Human activities affected significantl...
Conference Paper
Full-text available
The hare stock in Bulgaria has been steadily decreasing over the last decade. Despite this trend, it remains one of the most numerous indigenous game species in Bulgaria. The aim of the study is to investigate hare densities in different hunting areas in the plain habitats of the country, bellow an altitude of 600 meters. From 2010 until 2013spring...
Article
Full-text available
First confirmed breeding of Woodcock Scolopax rusticola in Vitosha Mountain (CW Bulgaria) Prvo potrjeno gnezdenje sloke Scolopax rusticola v gorovju Vitoša (osrednja zahodna Bolgarija) Woodcock Scolopax rusticola is a Palearctic species, breeding mainly in broad-leaved and mixed European forests. In Fennoscandia, it nests in mature coniferous fores...
Article
Full-text available
Fragments of a scull and lower jaws of Nutria were found near river Maritsa, close to Harmanli town. There are suitable habitats for this species in the area, overgrown with reed and rush near the bank and the islands in the river. The location lies at about 50 km on a straight line from the nearest one known on river Maritsa in Turkey, and at abou...
Article
Full-text available
This study aims investigation of chukar partridge losses during the incubation period in spe-cies' nesting habitat. From 45 nests set in 2010 and 2011, 19 (42.22 %) were destroyed. In 13 of these, mammal predation was the cause. 4 (8.89 %) were destroyed by birds and 2 (4.44 %) by unknown pest. Statistical differences between the size of destroyed...
Article
Full-text available
The purpose of the study is to define the effectiveness of spring release of Chukar Partridge (Alectoris chukar). In the spring of 2010, 49 Chukar Partridges were marked with radio-telemetric transmitters. After the release, the disposal of birds, survivability of the species and the reasons for losses have been established. In the regions studied,...

Network

Cited By

Projects

Project (1)
Archived project
1. Establishment of plant species composition and coverage; 2. Dynamics of physiological processes in tree saplings; 3. Establishment of damages from vertebrate animals.