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Size of marsh frogs in the Eurasian Otter's diet in Southern Bulgaria
Dilian Georgiev
Hystrix : the Italian Journal of Mammalogy , 2008, DOI: 10.4404/hystrix-19.1-4415
Abstract: Our study was carried out in the south of Bulgaria, providing original data on the size of the marsh frog Pelophylax ridibundus (Pallas, 1771) in otter Lutra lutra (Linnaeus, 1758) diet. A method was devised for estimating the size of these anurans found as bone remains in otter spraints. A very strong positive correlation between the ileum’s maximum width and frogs' standard body length was highlighted. The linear regression equation was: standard body length = 10.4 + 14.1 × ileum’s maximum width. The mean body length of marsh frogs in otter spraints was 53.49 mm. During the warm season otters fed on about four times more diverse sized anurans. The size group 41-60 mm always dominated in otter diet, particularly in the cold season. It could be concluded that in the study area otters fed predominantly on juvenile and sub-adult marsh frogs. Riassunto Dimensioni di Pelophylax ridibundus predate dalla lontra nel sud della Bulgaria. La ricerca, condotta nella Bulgaria meridionale, ha fornito dati inediti circa le dimensioni degli esemplari di rana verde maggiore (Pelophylax ridibundus Pallas, 1771) predati dalla lontra Lutra lutra (Linnaeus, 1758), stimate a partire dai resti ossei indigeriti reperibili nelle feci del mustelide. Una netta correlazione positiva è stata evidenziata tra la larghezza massima dell’ileum e la lunghezza totale standard degli esemplari esaminati. La regressione lineare ha fornito l’equazione: lunghezza totale = 10,4 + 14,1 × larghezza massima dell’ileum. La lunghezza media degli esemplari predati è risultata pari a 53,49 mm. Durante la stagione calda, le lontre utilizzano una varietà di taglie quattro volte maggiore che nella stagione fredda. La classe 41-60 mm è risultata sempre predominante, particolarmente nel periodo freddo, suggerendo che le lontre predano soprattutto individui giovani e sub-adulti.
First record of Grossuana angeltsekovi Gl er & Georgiev, 2009 (Gastropoda: Risooidea) from Greece
Dilian Georgiev
ZooNotes , 2013,
Abstract: In this paper it is reported the first finding of a representative of the genus Grossuana from the Greek Rhodopes Mts. – Grossuana angeltsekovi Gl er & Georgiev, 2009 which is and the first record of the species for this country. The locality is a karstic spring, Rodopi county, Papikio Oros, near Vronti (= 4 km N of Kerasia) (445 m a.s.l.). The material is stored in the Hungarian Natural History Museum, Budapest.
A record of Horned viper Vipera ammodytes (L.) in the diet of the Stone marten Martes foina (Erxl.) (Mammalia: Mustelidae) in Bulgaria
Dilian Georgiev
ZooNotes , 2009,
Abstract: Among undigested prey remains in Stone marten’s Martes foina (Erxl.) faeces (n=47), collected in Sakar Mountain (near Sladun Village) a single lower jaw from a Horned viper (Vipera ammodytes) was found. The rest of taxa registered in the Rock marten’s diet among the faecas were: Insceta indet., Lacerta sp., Pseudopus apodus, Aves indet., Dryomis nitedula, Sylvaemus sp., Arvicola terrestris, Microtus sp., and fruits of Rosa sp., Rubus sp., and Pyrus sp. The percent frequency of the main prey groups in the faeces were as follows: Mammalia (n=35, 74.5%), Aves (n=16, 34.0%), Reptilia (n=4, 8.5%), Insecta (n=4, 8.5%), and fruits (n=5, 10.6%).
Check list of the Bulgarian minor freshwater snails (Gastropoda: Risooidea) with some ecological and zoogeographical notes
DILIAN GEORGIEV
ZooNotes , 2011,
Abstract: A synopsis and critical overview of all the literature on the freshwater minor snails (Gastropoda: Risooidea) of Bulgaria was made. A check list of 49 species known till now in the country with the ecological and zoogeorgraphical categories to which the species belong was provided.
New localities of four Bulgarian endemic Hydrobiidae species (Mollusca: Gastropoda: Risooidea)
Dilian Georgiev
ZooNotes , 2011,
Abstract: New localities of Belgrandiella pussila Angelov, 1959, Belgrandiella angelovi Pintér, 1968, Bythiospeum copiosus (Angelov, 1972), and Grossuana thracica Gl er & Georgiev, 2009 were reported in Bulgaria. Some notes on the generic position of Belgrandiella angelovi and Bythiospeum copiosus were done.
Eurasian Otters in Micro Dams of Southern Bulgaria: Where to Place the Monitoring Zones?
Dilian Georgiev
IUCN Otter Specialist Group Bulletin , 2009,
Abstract: Ten micro dam sites were studied in Southern Bulgaria between 2005 and 2007. They were situated below 700 metres above sea level in the Upper Thracian Valley and the Sredna Gora mountain. All the bank perimeters, totaling 24.72 kilometres, were walked searching for otter spraint sites. Most of them were found in the area around the river inflow (n=53, 40.5%) followed by those near the wall of the dam (n=39, 29.8%). The other spraint sites were found in the two other zones of equal length in the middle part of the basins. The average levels of preference index showed the highest levels in the river inlet and dam wall zones. They were highest at the river inflow end, 1.6 (min-max=0.7–4.0) and a little lower near the wall, 1.2 (min-max=0.0–3.0). The middle zones of the basin were not so preferentially selected as spraint sites by otters, having index values about three times lower. We recommend otter monitoring at such basins to be focused on the areas close to the main river filling them.
Updated Information on the Habitat Distribution and Diversity of the Freshwater Malacofauna of Sarnena Gora Mountain (Bulgaria)
Dilian G. Georgiev
Ecologia Balkanica , 2012,
Abstract: According to the recent research and the critical overview of the literature it can be summarized that a total of 13 species of freshwater snails and 6 species of mussels are known to occur in Sarnena Gora Mountain. The highest richness of freshwater molluscs species in the surveyed area were found in the medium sized rivers having microhabitats favorable for the aquatic molluscs such as fast flowing oligotrophic stretches combined with slow moving eutrophic parts and small floods on the banks. The species community of the freshwater molluscs known to live in the mountain studied was consisted mainly by some widely distributed species with Holarctic and Palearctic distributions, followed by the European species. Two local endemics were also registered in the mountain.
Diet of the Golden Eagle (Aquila chrysaetos) (Aves: Accipitridae) in Sarnena Sredna Gora Mountains (Bulgaria)
Dilian G. Georgiev
Ecologia Balkanica , 2009,
Abstract: The material of pellets and food remains (as bone and shell fragments, hair, and feathers) was collected after the breeding season from below and within one nest of Golden Eagles on rocks at Sarnena Sredna Gora Mts., north-east of Stara Zagora town. Our study was carried out during a three year period (1999, 2000 and 2002). Total 65 specimens from minimum 10 species of preys were identified among the food remains from which the reptiles dominated. Mostly preyed by the Golden Eagles couple were the tortoises (Testudo sp.) with 55.4% from all registered individual preys. The most common prey from mammals was the hedgehog (Erinaceus roumanicus) with 13.8%. Interesting fact was and the relatively high percentage of the cats with 7.7% (possibly most of them domestic ones).
On the Fruit Consumption of Eurasian Badger (Meles meles) (Mammalia: Mustelidae) during the Autumn Season in Sredna Gora Mountains (Bulgaria)
Dilian G. Georgiev
Ecologia Balkanica , 2009,
Abstract: This case study was carried out at one badgers family territory by asingle collection (11.11.2002, north of Stara Zagora City, near Tabashka River) of faeces from the animal latrine sites. Total of 1361 individual food items were identified in Eurasian badger (Meles meles) faeces from which the fruits of the Cornel-tree (Cornus mas) strongly dominated (n=1332, 96.5% from all items, 98.2% from all fruits).
The Otter (Lutra lutra L.) Signs and the Banks Tree Cover: A Survey in Central and Eastern Bulgaria
Radostina Dimitrova,Dilian Georgiev
Ecologia Balkanica , 2012,
Abstract: The study was carried out during 2011 – 2012 at different water basins (rivers and micro dams) situated in Central and Eastern Bulgaria. Transects with 600 m length were walked along the banks in otter signs search. The search was stopped when the first otter signs were registered. As a whole we found domination of the very good or excellent bank tree cover. A total of 61% of transects were with tree cover between 50% and 100%. Almost equal were the stretches without or with little tree vegetation. At all transects surveyed the spraints dominated with 61%. All other otter signs were with low percentage. The otter tracks (foot prints) were on second place with 20% of occurrence, followed by the food remains with 7%. At 12% of transects we did not find any otter signs. As a whole the otter was registered in 88% of transects, a sign for a good population. Highest preference we registered for walking or feeding of the otter at the open banks with no or with weak tree cover.
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