51. Biometry and population gender structure of three crab species (Crustacea: Decapoda) from sandy bottom in the northern Adriatic SeaMona Rezaei, Al Vrezec, Borut Mavrič, Lovrenc Lipej, 2019, original scientific article Abstract: The aim of the study was to investigate the distribution and population structure of three species of crabs (Decapoda: Crustacea), Medorippe lanata, Liocarcinus depurator and Liocarcinus vernalis for their biometric relationships. A total of 1100 specimens of three species were caught from waters off the northern Adriatic Sea in December 2013. Biometric relationships and condition factor (Fulton’s coefficient index) were measured for all the studied species. Size dimorphism was also observed in M. lanata with females showing significantly larger carapace size than males without significant difference in wet weight. The studied species did not differ significantly in the results of the condition index.
Keywords: biometry, condition factor, Adriatic Sea
Published in DiRROS: 31.07.2024; Views: 847; Downloads: 610
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54. Obročkanje ptic v Sloveniji leta 2014 in rezultati prvega telemetrijskega spremljanja selitvene poti afriške selivkeAl Vrezec, Dare Fekonja, Katarina Denac, 2015, original scientific article Abstract: In 2014, 162 bird species were recorded during the bird ringing activities in Slovenia. Of 155 species, 62,275 birds were ringed, and 107 recoveries of birds ringed in Slovenia and found abroad, 148 foreign recoveries in Slovenia and 1395 local recoveries were recorded. The most frequently ringed species were Blackcap Sylvia atricapilla and Great Tit Parus major. As far as ringed nestlings are concerned, Great Tits and Barn Swalllows Hirundo rustica predominated. Considering the recoveries ringed of found birds abroad, the commonest were Black-headed Gulls Chroicocephalus ridibundus and Mute Swans Cygnus olor. The farthest recovery was a Barn Swallow Hirundo rustica found in the Democratic Republic of Congo (5171 km away). Among the more interesting finds was also the so far southernmost recovery of a Sand Martin Riparia riparia found in Israel. Let us also mention the first recovery of a Corncrake Crex crex, which bred and was ringed in 2013 at Planinsko polje (central Slovenia) and was found in the 2014 breeding season in the Czech Republic. Among rare species, two Little Buntings Emberiza pusilla were caught and ringed. After nine years, the Roller Coracias garrulus bred again in Slovenia in 2014 and its nestlings were ringed. The paper also brings the description of the migration route of the first African migrant, the Black Stork Ciconia nigra, marked with a GPS/GSM telemetric device, which migrated across the Adriatic Sea, Sicily and Sahara to Nigeria.
Keywords: obročkanje, telemetrija, črna štorklja, najdbe (biologija)
Published in DiRROS: 29.07.2024; Views: 1124; Downloads: 713
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55. Velikost populacije prepelice Coturnix coturnix na Ljubljanskem barju se je v dvajsetih letih zmanjšala za polovico, morda pa še za (bistveno?) večDavorin Tome, Al Vrezec, Špela Ambrožič Ergaver, Andrej Kapla, 2016, original scientific article Abstract: In 2015, we used the same method as in the 1989-1996 period to count calling males of the Common Quail Coturnix coturnix in selected 1x1 km squares of Ljubljansko barje (central Slovenia). We counted 39 males, which is 87% less compared to the survey 20 years ago. Quails were found in 56% fewer squares. Since Quail populations are known to fluctuate greatly between years, we think that the most realistic long-term estimate for population decline would be somewhere between 50 to 90%. We detected that within only one week males stopped calling in some squares, while in others they began calling although they had not been detected there before, indicating possible relocations. This dynamics should be considered when designing a population monitoring protocol for the Quail.
Keywords: travniki, upad populacije, prepelica, Ljubljansko barje, monitoring
Published in DiRROS: 26.07.2024; Views: 1544; Downloads: 469
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56. Obročkanje ptic v Sloveniji leta 2015 in pojav velikih krivokljunov Loxia pytyopsittacusAl Vrezec, Dare Fekonja, 2016, original scientific article Abstract: In 2015, 170 bird species were recorded during bird ringing activities in Slovenia. We ringed 73,371 birds belonging to 162 species, there were 132 foreign recoveries of birds ringed in Slovenia, 120 recoveries of birds ringed abroad and found in Slovenia, as well as 1964 local recoveries. The most frequently ringed species were Blackcap Sylvia atricapilla and Great Tit Parus major. In ringed nestlings, Great Tits and Tree Sparrows Passer montanus predominated. In 2015, the first preliminary ringing of Scops Owls Otus scops during migration took place, resulting in the highest number of Scops Owls ringed so far. Concerning recoveries of birds ringed in Slovenia and later recorded abroad and birds ringed abroad and later recorded in Slovenia, the commonest were Mute Swans Cygnus olor and Black-headed Gulls Chroicocephalus ridibundus. The longest-distance recovery concerned a Reed Bunting Emberiza schoeniculus found in Sweden (2,144 km away). Among the interesting finds were also the first finds of ringed Pygmy Cormorants Microcarbo pygmeus so far from breeding sites in Hungary. Among rare species, Yellow-browed Warbler Phylloscopus inornatus, Spanish Sparrow Passer hispaniolensis and a pair of Parrot Crossbills Loxia pytyopsittacus were caught and ringed, the latter for the very first time in Slovenia after more than 100 years. An overview of records of the Parrot Crossbill is given herein, as well as analysis of irruptive years of the Red Crossbills Loxia curvirostra between 1980 and 2015, when the probability of boreal Crossbill species occurrence is the highest. According to the ringers’ data, the irruptive years of Red Crossbills in Slovenia were 1984, 1985, 2007, 2008, 2010, 2011 and 2012. The article points to the probability that Parrot Crossbills have been overlooked in the past, since larger specimens of Crossbills were ringed mostly in irruptive years, but no specific bill measurements important for distinguishing between Parrot and Red Crossbill had been taken.
Keywords: obročkanje, najdbe, Slovenija, 2015, veliki krivokljun
Published in DiRROS: 26.07.2024; Views: 1106; Downloads: 638
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57. Pregled pojavljanja močvirske uharice Asio flammeus v Sloveniji med letoma 1995 in 2015 ter verjetno gnezdenje v eruptivnem letu 2008Al Vrezec, 2016, original scientific article Abstract: Between 1995 and 2015 the number of records of Short-eared Owl Asio flammeus in Slovenia increased drastically, especially after 2007, but the species occurred regularly every year since 2002. Before that, the Short-eared Owl was regarded as a very rare migrant in Slovenia. Most of the observations were from wintering and migration periods, and the most important areas for the species in Slovenia were Ljubljansko barje, Lake Cerknica, surroundings of the water reservoir Medvedce and coastal wetlands. In 2008 and 2013 the Short-eared Owl occurred in large numbers, and these years were regarded as irruptive. Flocks of 2 to 8 birds were observed. At Ljubljansko barje, increased numbers of observed Short-eared Owls coincided with a large population of small mammals (species of the genus Apodemus and Microtus) and poor snow cover in 2008, and at least three communal roost sites were found that year. In the irruptive year 2013 there was a greater number of Short-eared Owls observed at the Medvedce water reservoir. On the plain at Lesce near the village of Smokuč an injured second year female was found at the end of March 2008 with a developing brood patch in its initial stage. It is likely that the female attempted to nest, which confirms the status of the species as occasional breeder in Slovenia. The last confirmed breeding in Slovenia was recorded in 1936 at Ljubljansko barje. In addition to local conditions (population of small mammals, snow cover) the frequency of occurrence of the Short-eared Owl in Slovenia is also affected by the population of development in the Boreal region and changes in migratory characteristics of the species in Europe. Therefore, an increase of the number of Short-eared Owls in Slovenia is expected in the future, as well as breeding attempts by this nomadic owl in seasons with high populations of small mammals and green winters, of course, if appropriate meadow habitat is still preserved.
Keywords: močvirska uharica, pojavljanje, gnezdenje, erupcija, Ljubljansko barje
Published in DiRROS: 26.07.2024; Views: 940; Downloads: 554
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58. Poročilo o obročkanju ptic v Sloveniji v letu 2016 in pojavljanje mušje listnice Phylloscopus inornatus v 25 letih v SlovenijiAl Vrezec, Dare Fekonja, 2017, original scientific article Abstract: V okviru obročkovalne dejavnosti v Sloveniji smo v letu 2016 zbrali podatke o 176 vrstah ptic. Obročkali smo 65.711 ptic 165 vrst, zabeležili 148 domačih, 245 tujih in 1840 lokalnih najdb. Največ je bilo obročkanih črnoglavk Sylvia atricapilla, med mladiči v gnezdu pa so prevladovale velike sinice Parus major, poljski vrabci Passer montanus in bele štorklje Ciconia ciconia. Med domačimi in tujimi najdbami so prevladovale najdbe na osnovi branja barvno obročkanih ptic, zlasti rečnih galebov Chroicocephalus ridibundus, labodov grbcev Cygnus olor in navadnih čiger Sterna hirundo. Med lokalnimi najdbami so prevladovale najdbe velikih sinic in čižkov Spinus spinus. Med redkimi vrstami so bili v letu 2016 obročkani dve mušji listnici Phylloscopus inornatus, plevelna trstnica Acrocephalus agricola, mali strnad Emberiza pusilla in pojoči samec črnoglavega strnada Emberiza melanocephala, ki je v Sloveniji leta 2016 verjetno tudi gnezdil. Število ujetih mušjih listnic se v zadnjih 25 letih sicer povečuje, a vrsta je v Sloveniji še vedno redek in nereden gost na jesenski selitvi.
Keywords: obročkanje, najdbe, Slovenija, 2016
Published in DiRROS: 25.07.2024; Views: 964; Downloads: 567
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59. Novel, male-produced aggregation pheromone of the cerambycid beetle Rosalia alpina, a priority species of European conservation concernAlenka Žunič Kosi, Yunfan Zou, Michal Hoskovec, Al Vrezec, Nataša Stritih Peljhan, Jocelyn G. Millar, 2017, original scientific article Abstract: Several recent studies have demonstrated the great potential for exploiting semiochemicals in ecology and conservation studies. The cerambycid beetle Rosalia alpina represents one of the flagship species of saproxylic insect biodiversity in Europe. In recent years its populations appear to have declined substantially, and its range has shrunk considerably as a result of forest management and urbanization. Here, we collected volatile chemicals released by males and females of R. alpina. Analyses of the resulting extracts revealed the presence of a single male-specific compound, identified as a novel alkylated pyrone structure. In field bioassays in Slovenia, traps baited with the synthesized pyrone captured both sexes of R. alpina, indicating that the pyrone functions as an aggregation pheromone. Our results represent the first example of a new structural class of pheromones within the Cerambycidae, and demonstrate that pheromone-baited traps can provide a useful tool for sampling R. alpina. This tool could be particularly useful in the ongoing development of conservation strategies for the iconic but endangered Alpine longicorn.
Keywords: pheromones, beetles, plants, endangered species, conservation science
Published in DiRROS: 25.07.2024; Views: 1190; Downloads: 913
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60. Cucujus cinnaberinus (Scopoli, 1763) at its terra typica in Slovenia : historical overview, distribution patterns and habitat selectionAl Vrezec, Špela Ambrožič Ergaver, Andrej Kobler, Andrej Kapla, Maarten De Groot, 2017, original scientific article Abstract: The saproxylic beetle, Cucujus cinnaberinus, has received increasing research attention in Europe since the adoption of the Habitats Directive and establishment of the Natura 2000 network. The history of the species has been investigated as well as the influence of abiotic and biotic variables on the distribution of C. cinnaberinus in Slovenia which is at the limit of its range and also terra typica for the species. The species was first described in 1763 by Joannes A. Scopoli in Carniola, a duchy of the Habsburg Monarchy. Today, most of the territory of Carniola is situated within Slovenia. C. cinnaberinus is particularly common in the eastern part of the country, but very scarce in the mountainous western part. According to historical and recent distribution patterns of C. cinnaberinus in the former Carniolan territory, the region of Ribnica-Kočevje in southern Slovenia is proposed as the most probable type locality of the species. Although the bulk of the C. cinnaberinus population in Slovenia is confined to the lowlands, the species has been found up to 1095 m a.s.l., albeit at a much lower abundance due to the influence of climate and forest structure. Although C. cinnaberinus is a quite an opportunistic species regarding host tree selection, it has been shown to exhibit a preference for Tilia, Populus and Robinia. It is suspected that the high abundance of C. cinnaberinus in lowland floodplain forests is due to the recent human-induced increase in preferred fast-growing and short-lived host trees, i.e. the planting of poplar trees and spread of invasive Black Locust (Robinia pseudoacacia) after the 1960s. In contrast, in montane forests, preferred host trees (e.g. Tilia) represent < 1 % of all growing stock. Although montane C. cinnaberinus populations are rare, they could still be important for the conservation of the species, since montane habitats cover the largest area within the species’ distribution range.
Keywords: saproxylic beetle, Natura 2000, type locality, Carniola, altitudinal distribution, host tree selection, macrohabitat, large-scale survey
Published in DiRROS: 24.07.2024; Views: 1380; Downloads: 626
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