Acrocephalus最新文献

{"title":"Results of the January 2017 waterbird census in Slovenia","authors":"Luka Božič","doi":"10.1515/ACRO-2017-0012","DOIUrl":"https://doi.org/10.1515/ACRO-2017-0012","url":null,"abstract":"Summary In 2017, the International Waterbird Census (IWC) was carried out in Slovenia on January 14 and 15. Waterbirds were counted on all larger rivers, along the entire Slovenian Coastland and on most of the major standing waters in the country. During the census, in which 235 observers took part, 413 sections of the rivers and coastal sea with a total length of 1,427 km and 200 other localities (164 standing waters and 36 streams) were surveyed. The census was characterized by harsh winter conditions and high proportion of frozen water bodies. Altogether, 51,790 waterbirds of 61 species were counted. Thus, the number of waterbirds and the number of species recorded were close to the 21-year average. The highest numbers of waterbirds were counted in the Drava count area, i.e. 20,064 individuals (38.7% of all waterbirds in Slovenia). By far the most numerous species was Mallard Anas platyrhynchos (46.1% of all waterbirds), followed by Coot Fulica atra (6.8% of all waterbirds), Cormorant Phalacrocorax carbo (5.9% of all waterbirds), Black-headed Gull Chroicocephalus ridibundus (5.7% of all waterbirds) and Mute Swan Cygnus olor (3.9% of all waterbirds). The number of 1,000 counted individuals was also surpassed by Yellow-legged Gull Larus michahellis, Teal An. crecca, Tufted Duck Aythya fuligula, White-fronted Goose Anser albifrons, Pygmy Cormorant P. pygmeus and Grey Heron Ardea cinerea. Among the rarer recorded species, the Red-breasted Goose Branta ruficollis (registered for the first time during the January Waterbird Censuses and only for the third time ever in Slovenia) and Barnacle Goose Branta leucopsis (the first probable A category individual for IWC and Slovenia) deserve special mention. Numbers of the following species were the highest so far recorded during the IWC: Mandarin Duck Aix galericulata (together with 2006 and 2012), Pintail An. acuta, Ferruginous Duck Ay. nyroca, Long-tailed Duck Clangula hyemalis (together with 2003), Goosander Mergus merganser, Pygmy Cormorant, Herring Gull L. argentatus and Caspian Gull L. cachinnans. Number of Pochards Ay. ferina was the lowest so far recorded during the IWC.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"203 - 215"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45625939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental characteristics of shallow bottoms used by Greater Flamingo Phoenicopterus roseus in a northern Adriatic lagoon","authors":"F. Scarton","doi":"10.1515/acro-2017-0010","DOIUrl":"https://doi.org/10.1515/acro-2017-0010","url":null,"abstract":"Abstract Since the beginning of this century, Greater Flamingo Phoenicopterus roseus flocks have been observed regularly when feeding in the large extensions of shallow bottoms in the Lagoon of Venice (NE Italy), the largest lagoon along the Mediterranean. Nowadays thousands of flamingos are present throughout the year. Between 2013 and 2017 I collected data on the environmental features of the shallow bottoms used by feeding flocks, along with measurements of flight initiation distance (FID) of Greater Flamingo in response to the approach of boats and pedestrians. Shallow bottoms were shown to be used when covered with approximately 10 to 60 cm of water. All the feeding sites were in open landscapes, with low occurrence of saltmarshes in a radius of 500 m. The bottoms were barely covered with seagrasses (<4% of the surface around the survey points) and were mostly silty. Feeding flocks were on average 1.2 km far from the nearest road or dyke, while the mean distance from channels that could be used by boats was about 420 m. The mean FID caused by boats or pedestrians was 241 m ± 117 m (N = 31, ± 1 SD) without significant differences between those for the two disturbance sources. The use of shallow bottoms by the Greater Flamingo appears governed primarily by the tidal cycle, but boat disturbance probably modifies this effect. According to FID values, a set-back distance of 465 m is suggested to reduce the disturbance caused by boats and pedestrians to the flamingo feeding flocks.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"161 - 169"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45894900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Poročilo o obročkanju ptic v Sloveniji v letu 2016 in pojavljanje mušje listnice Phylloscopus inornatus v 25 letih v Sloveniji","authors":"Al Vrezec, Dare Fekonja","doi":"10.1515/acro-2017-0011","DOIUrl":"https://doi.org/10.1515/acro-2017-0011","url":null,"abstract":"Abstract In 2016, data on 176 bird species were gathered during bird ringing activities in Slovenia. A total of 65,711 birds of 165 different species were ringed. Furthermore, 148 recoveries of birds ringed in Slovenia and found abroad, 245 foreign recoveries in Slovenia and 1840 local recoveries were made. The most frequently ringed species was the Blackcap Sylvia atricapilla. Among the ringed nestlings, Great Tits Parus major, Tree Sparrows Passer montanus and White Storks Ciconia ciconia predominated. Considering recoveries of birds ringed or found abroad, the most frequent were finds based on colour rings, especially of Black-headed Gulls Chroicocephalus ridibundus, Mute Swans Cygnus olor and Common Terns Sterna hirundo. As far as local recoveries are concerned, most data were collected for Great Tit and Siskin Spinus spinus. Among rare species, two Yellow-browed Warblers Phylloscopus inornatus were ringed, one Paddyfield Warbler Acrocephalus agricola, one Little Emberiza pusilla and one Black-headed Bunting Emberiza melanocephala, the latter as a singing male, which probably also bred in 2016. The catch frequency of the Yellow-browed Warblers has indeed been increasing in Slovenia in the last 25 years, but this is still a rare and irregular vagrant on autumn migration.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"171 - 202"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48510297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Population trends of Goričko agricultural landscape birds","authors":"Katarina Denac, P. Kmecl, Gregor Domanjko, D. Denac","doi":"10.1515/acro-2017-0009","DOIUrl":"https://doi.org/10.1515/acro-2017-0009","url":null,"abstract":"Abstract Due to numerous bird surveys in the past 20 years, the avifauna of Goričko is relatively well known. For some species, the very first national ecological researches were conducted in this area. The article summarizes all bird surveys so far. It presents population trends of farmland species which is one of the most threatened bird groups in Europe. Most of the qualifying species of this habitat that are protected within the Natura 2000 network have suffered a decline at Goričko, specifically Quail Coturnix coturnix, Scops Owl Otus scops, Hoopoe Upupa epops, Woodlark Lullula arborea and White Stork Ciconia ciconia. The number of breeding pairs of the latter has not changed, but its fecundity has decreased. Furthermore, populations of other farmland bird species have decreased, for example Skylark Alauda arvensis, Stonechat Saxicola rubicola, Serin Serinus serinus and Common Linnet Linaria cannabina, as well as butterfly populations and tracts of grassland habitat types. National agricultural and nature conservation policies are evidently inefficient in protecting the biodiversity of Goričko. The most probable cause for bird population decline is agricultural intensification, which manifests itself at Goričko as disappearance and intensification of meadows, land consolidation, degradation of traditional orchards and use of pesticides. As a result of land consolidation hedges, uncultivated strips between fields, individual trees and bushes and minority habitat types are disappearing, whereas the surface of arable fields is increasing. Nature conservation measures performed by the Public Institute Goričko Nature Park with the support of DOPPS – BirdLife Slovenia volunteers seem to be efficient, but are spatially and temporally constrained. For this reason, they cannot serve as a substitute for insufficient systemic financing which could be improved by substantive and financial reform of the agri-environmental scheme. Currently, a negligible percentage (1% in 2016) of Goričko is covered by agrienvironmental scheme measures with positive influence on qualifying species and habitat types. As a consequence, only an insignificant share of subsidies from the Rural Development Plan is used for nature protection at Goričko. If the system of agricultural subsidies remains unaltered, no improvement of the conditions for bird conservation at Goričko can be expected.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"127 - 159"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acro-2017-0009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49318673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Population dynamics of five riverbed breeding bird species on the lower Drava River, NE Slovenia","authors":"Luka Božič, D. Denac","doi":"10.1515/acro-2017-0008","DOIUrl":"https://doi.org/10.1515/acro-2017-0008","url":null,"abstract":"Abstract In 2006–2017, annual censuses of breeding bird species regarded as indicators of natural rivers were carried out on the 38.9 km long lowland stretch of the Drava riverbed between Maribor and Zavrč with altered flow regime due to the operating hydropower plants. Gravel bar habitats were surveyed in four years of the study period by combining orthophoto analysis and analysis of field photographs. Effects of gravel bar management were evaluated based at 20 locations. The Little Ringed Plover Charadrius dubius occurred on 39.8% of the gravel bars, but most were occupied only in a few years and held just one breeding pair. Low numbers between 2009 and 2012 (< 30 pairs) were followed by a steep population increase from 2014 onwards to a maximum of 66–73 pairs (1.7–1.9 p/km). Such population dynamics was attributed to the lack of large discharges (>500 m3/s) and consequent overgrowing of riverbed in the first part of the study period, while the increase in the second part was due to the creation of extensive shingle areas (from 20,6 ha in 2009/10 to 37,8 ha in 2014) by the extreme flood in early November 2012, subsequent regular occurrence of large discharges outside the breeding seasons and large-scale removals of woody vegetation. Breeding population of Common Sandpiper Actitis hypoleucos remained at a rather similar low level (<20 p) during most of the period studied after an initial decline, and did not reflect changes in the overall surface area of riverbed habitats. Contrary to the general situation, the number of breeding pairs on gravel bars subjected to management increased several-fold. Maximum number of pairs on these bars was reached up to four years after the initiation of management measures, as only then the optimal mosaic of early successional stages interspersed with shingle areas developed at main sites. The species was widespread only on lower part of the Drava. Kingfisher Alcedo atthis was fairly widely distributed along the riverbed, but occurred in rather low densities throughout (c. one pair on 2–3 km of the studied riverbed on average), probably as a result of limited bank erosion and consequent overgrowing/lack of suitable nest sites. The population was estimated as stable with effects of harsh winter conditions on breeding numbers in some years. The majority of nest holes were excavated in eroded river banks along the main river channel (77.8%), followed by similar sites located in mouth areas of small tributaries of the Drava (14.8%). Regular breeding of Sand Martin Riparia riparia since 2012 (up to 259, mostly at only one location annually) was almost exclusively the result of the annual artificial nest site preparation programme. Fairly large gravel bar-breeding population of White Wagtail Motacilla alba, monitored since 2013 and predominantly ground nesting in sparsely vegetated areas, seems unusual considering the prevalent breeding habits of the species at the European scale. Conservation implications and guideli","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"126 - 85"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45738032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The occurrence of rufous-morph Cuckoo Cuculus canorus females in NE Slovenia","authors":"F. Bračko","doi":"10.1515/ACRO-2017-0007","DOIUrl":"https://doi.org/10.1515/ACRO-2017-0007","url":null,"abstract":"Summary Between 1982 and 2016, I observed 103 Cuckoos Cuculus canorus in NE Slovenia (3,170 km2). The data were collected randomly, thus only individuals that were seen or ringed are included in the total. Among these, seven females (6.7%) belonged to the rufous morph. The percentage of rufous individuals varies regionally throughout Central Europe.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"61 - 62"},"PeriodicalIF":0.0,"publicationDate":"2017-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44751501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of Middle Spotted Woodpecker Dendrocopos medius distribution in the Karst region (W Slovenia), results of the first systematic census and first recorded breeding of the species in the area","authors":"Sara Cernich, D. Stanič","doi":"10.1515/acro-2017-0004","DOIUrl":"https://doi.org/10.1515/acro-2017-0004","url":null,"abstract":"Abstract The Middle Spotted Woodpecker Dendrocopos medius is a highly specialised woodpecker inhabiting mature deciduous forests. The presence of large mature oaks Quercus sp. is a very important factor determining the species' presence and distribution. In Slovenia it is more common in the eastern part, where it inhabits mainly lowland flood-plain oak forests. In other parts of the country it is more localised, as is the case in western Slovenia, where small isolated populations were recently discovered. In this paper we present the currently known observations of Middle Spotted Woodpecker in the Karst region (W Slovenia), the results of the first systematic survey and the first documented breeding of the species in this area. The survey was carried out on the 20 of March 2016 in the wooded hills between the villages of Senožeče and Veliko polje. Using playback method we recorded a total of 8 territorial woodpeckers, confirming our initial expectations about the species' abundance in that area. Breeding was also confirmed in the hills of Senožeče, an active nest-hole was found on 23 Apr 2017. On 18 May 2017 at least 3 juveniles successfully left the nest. Middle Spotted Woodpeckers have recently been observed also in other oak woodlands across the Karst and nearby areas, especially outside the breeding season. These areas include Lipica, Bazovica, the Brkini hills and the Gorica Karst. From summer 2016 onwards several observations of Middle Spotted Woodpeckers have been reported from Lipica, involving up to four different individuals. Repeated sightings in this area and the presence of suitable habitat suggest a probable breeding. The increased number of data in western Slovenia during the last decade might be a consequence of more frequent field visits by ornithologists. Moreover, the presence of the Middle Spotted Woodpecker in this part of the country might be linked to the gradual spreading of forests and the maturing of oak stands already present here. In the above-mentioned areas, further investigations and systematic censuses are therefore needed in the coming springs.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"37 - 44"},"PeriodicalIF":0.0,"publicationDate":"2017-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45940635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Breeding range, population size and population trend of the Ortolan Bunting Emberiza hortulana in Slovenia between 1979 and 2016","authors":"D. Stanič, P. Kmecl, Jernej Figelj, A. Sovinc","doi":"10.1515/acro-2017-0001","DOIUrl":"https://doi.org/10.1515/acro-2017-0001","url":null,"abstract":"Abstract In this work we investigated the historical and present breeding range of the Ortolan Bunting in Slovenia and studied one of its last remaining breeding grounds in the country. Its range has suffered a marked decline in the last few decades, bringing the species on the brink of extinction in Slovenia. Firstly, we gathered all the available data and field records regarding the species in Slovenia and created several distribution maps outlining the status of the Ortolan Bunting in Slovenia. Thus we were able to confirm the drastic reduction in the species range, now confined to only two larger breeding grounds on the Karst (Kras). Field work was then concentrated on studying and monitoring one of the two last known populations of Ortolan Buntings in Slovenia. We paid special attention to the study of the males’ singing territories. Our main discovery was the presence of a lek in the central part of the study area, where several different male Ortolan Buntings shared their song-posts. In 2013 we counted a total of 18 Ortolan Buntings and found 5 nests, whereas in 2014 we counted 16 individuals, with 4 pairs probably breeding there. The number of breeding pairs is thus significantly lower than the total number of males holding territory. In the period from 2005 to 2016, the population of Ortolan Bunting in Slovenia was in steep decline.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"20 - 3"},"PeriodicalIF":0.0,"publicationDate":"2017-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acro-2017-0001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49033209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence of the Red Kite Milvus milvus in Slovenia","authors":"Dejan Bordjan","doi":"10.1515/acro-2017-0006","DOIUrl":"https://doi.org/10.1515/acro-2017-0006","url":null,"abstract":"Abstract The Red Kite Milvus milvus breeds alomost exclusively in Europe, its population is in decline. In the past, it was regarded as a rare migrant in Slovenia. In the 1990s it was classified as a possible breeder, extremely rare winter guest with more observations during migration. Between 1977 and January 2017 117 records of 121 individuals were gathered. Most (113) involved single birds on migration. Exceptionally, birds were present for a longer period - a single record of a summering bird is known. Since 1980 the number of birds per year increased from 1 to 1.1, 3 and 9 after 2009. Possible reasons are increased awareness and population increases to the north and northeast of Slovenia. Red Kites were observed throughout the year with the lowest numbers during summer and winter, which surprising, because the species is increasingly common during winter in central Europe. Migration of Red Kites in Slovenia begins in February with a peak in early April and May and between August and mid-November with a peak in early in October. The migration period coincides with arrivals and departures from breeding grounds. Red Kites have been observed all across the country, with more observations at well-watched sites. Birds were observed between sea level and 1740 m a.s.l. with only a handful of observations above 1000 m a.s.l.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"55 - 59"},"PeriodicalIF":0.0,"publicationDate":"2017-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48207858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diet of the Tawny Owl Strix aluco in the area of Slovenske gorice (NE Slovenia)","authors":"F. Janžekovič, Mateja Polc, Polona Petovar, Tina Klenovšek","doi":"10.1515/acro-2017-0005","DOIUrl":"https://doi.org/10.1515/acro-2017-0005","url":null,"abstract":"Abstract The diet of Tawny Owl Strix aluco was studied in the area of Slovenske gorice - NE Slovenia. The analysis was carried out by examining pellets collected at ten locations in the period from 1984 to 2015. From the pellets, 2,121 prey units were isolated. The predominant prey were mammals (Mammalia, 84.8%), followed by birds (Aves, 8.3%), insects (Insecta, 4.7%), frogs (Anura, 1.6%) and earthworms (Oligochaeta, 0.5%). Four orders of mammals were found: rodents (Rodentia), insectivores (Insectivora), bats (Chiroptera) and carnivores (Carnivora). The most frequent prey in the owls’ diet were voles (Arvicolinae, 46.6%) and mice (Murinae, 28.8%), while the number of shrews (Soricidae) was low (4.5%). The obtained results are in concordance with the conclusions of other studies. In the area of Slovenske gorice, the Tawny Owl is an opportunistic predator of small mammals with an emphasis on voles and mice. Prey frequencies differ significantly among some localities. Variability in proportions of prey species among localities can also be the result of sampling carried out in different seasons and variability in the population dynamics of small mammals among years. Challenges for future research are to describe seasonal variability of the diet and to evaluate interspecific competition within the guild of night predators of small mammals: Tawny Owl, Long-eared Owl Asio otus, and Barn Owl Tyto alba, which are sympatric in this area.","PeriodicalId":53560,"journal":{"name":"Acrocephalus","volume":"38 1","pages":"45 - 53"},"PeriodicalIF":0.0,"publicationDate":"2017-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46473612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}