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The Journal of Bird Watching and Bird Study Association of Slovenia - DOPPS Bird Life

Acrocephalus

An overview of the long-term (1980–2019) population development of colonial Laridae species in continental part of Slovenia, their nest sites at anthropogenic water bodies, and various conservation measures with special focus on Common Tern <italic>Sterna hirundo</italic> along the Slovenian/border part of the Drava River is given. Breeding of these species occurs only on the westernmost fringes of the Pannonian plain, on lowland floodplains of the main rivers of the Danube Basin. Altogether, breeding of Common Tern and Black-headed Gull <italic>Larus ridibundus</italic> was recorded at 11 and 10 sites, respectively. Lake Ptuj is the single site with mixed-species colony residing there in all years of the study period, while at Ormož (two sites) it was established during the early 1990s in the Slovenian territory but moved completely to the Croatian side by the second half of the 2010s. At all other sites, a suitable breeding habitat became available or was provided by management in just a few years, or created only recently. The percentage of Common Tern national population breeding in continental Slovenia was usually well above 50% throughout the 1980s and 1990s (52–136 pairs), while in the last 16 years (77–258 pairs) it ranged between 40.8% and 69.0%. Breeding of Black-headed Gull remains largely limited to continental Slovenia. Overall, continental populations of both species in the last few years have been substantially higher compared to the most of the study period. Long-term trends were estimated as a moderate increase for Common Tern and a strong increase for Black-headed Gull. Since 2006, the Mediterranean Gull <italic>L. melanocephalus</italic> has been a regular breeder at Lake Ptuj (up to 28 pairs), the only such site in Slovenia. Three general types of conservation measures implemented at different nesting locations are described in detail: (1) measures to create/increase the total surface of breeding habitat – the construction of new breeding structures, such as artificial islands and nesting rafts, (2) measures to maintain and enhance breeding habitat through recurring management activities, and (3) measures aimed to increase chick/nest survival and improve breeding success.

Abstract

Keywords

<article-title>Breeding population dynamics of Common Tern <italic>Sterna hirundo</italic> and associated gull species with overview of conservation management in continental Slovenia</article-title>

Breeding population dynamics of Common Tern  and associated gull species with overview of conservation management in continental Slovenia

Between 2002 and 2019, monitoring of Common Tern <italic>Sterna hirundo</italic> and Little Tern <italic>Sternula albifrons</italic> along the Sava River near Zagreb, Croatia was conducted. Natura 2000 site “Sava kod Hrušćice” was designated to protect colony at river islands, with estimated population sizes of 100–150 pairs of Common and 20 pairs of the Little Tern. Flooding of the colony caused breeding failure in several years. Common Terns moved to breed on islands in gravel pits with a total population around 150 pairs, while Little Tern did not breed after 2010. In the last few years, terns have not bred at Hrušćica and the only colony inside the Natura 2000 site is situated on a breeding platform at Siromaja gravel pit. Channelling of rivers and hydropower plants are the main threats, changing natural dynamics of water level and causing reduction of gravel sediment in rivers.

<article-title>Dynamics of Common <italic>Sterna hirundo</italic> and Little Tern <italic>Sternula albifrons</italic> populations along the Sava River in North-western Croatia between 2002 and 2019</article-title>

Dynamics of Common  and Little Tern  populations along the Sava River in North-western Croatia between 2002 and 2019

During the breeding periods of 2018 and 2019 we investigated the extent of areas Common Terns <italic>Sterna hirundo</italic> use while searching for food. We used GPS-UHF tags to follow the movements of 23 terns from Slovenia (7 individuals) and Croatia (16 individuals). We investigated the movements of birds from three breeding sites, i.e. Lakes Ptuj, Siromaja 2 and Rakitje. Conclusions are based on 43,105 locations which were collected with a frequency of one reading per 20 minutes during the day and one reading per 4 hours during the night.

<article-title>Area use and important areas for Common Tern <italic>Sterna hirundo</italic> inland populations breeding in Slovenia and Croatia</article-title>

Area use and important areas for Common Tern  inland populations breeding in Slovenia and Croatia

63 Common Tern <italic>Sterna hirundo</italic> samples from Croatia and Slovenia were analysed with respect to their genetic diversity and differentiation. Samples originated from two freshwater populations (areas of the rivers Sava and Drava) and one coastal population (Sečovlje Salina). The molecular marker of choice was 709 bp long fragment of the mitochondrial control region, the fastest-evolving part of the mitochondrial genome. 21 haplotypes with 12 polymorphic sites were identified. Overall haplotype diversity was substantial and estimated at 0.8599, while the overall nucleotide diversity was low and estimated at 0.0025. Diversity indices were highest for the Drava population, followed by the Sava and the lowest for the Sečovlje population. Overall genetic structure was significantly low (Fst=0.0377) and attributed to the differences in haplotype frequencies between the populations. The high level of genetic diversity found in continental populations illustrates the importance of their habitats as reservoirs of genetic diversity and calls for their further protection and management.

Faculty of Science, Department of Biology

Sečovlje Salina Nature Park, SOLINE Pridelava Soli d.o.o., Seča 115, Portorož,

<article-title>Mitochondrial DNA control region diversity in Common Terns <italic>Sterna hirundo</italic> from Slovenia and Croatia</article-title>

Mitochondrial DNA control region diversity in Common Terns  from Slovenia and Croatia

The catalogue presents the data on all specimens of terns (Sterninae) that have been inventoried into the ornithological collection of the Slovenian Museum of Natural History (PMS). The catalogue includes data on preserved as well as lost specimens. The data have been collected from all inventory books at hand in the Slovenian Museum of Natural History. By the end of 2019, 66 different specimens of eight tern species have been recorded in the ornithological collection, of which 56 specimens are still preserved. Most specimens were collected in the 1940–1970 period. The largest number of specimens concerns the Black Tern <italic>Chlidonias niger</italic> and Common Tern <italic>Sterna hirundo</italic>. Among the collected terns, the specimens found in Slovenia predominate. Five specimens originate from other countries, specifically Eritrea, Oman, Serbia and Croatia.

<article-title>Terns (Sterninae) in the collection of the Slovenian Museum of Natural History</article-title>

Terns (Sterninae) in the collection of the Slovenian Museum of Natural History

{"article-title":"Terns (Sterninae) in the collection of the Slovenian Museum of Natural History"}

Morphometric data on Common Terns breeding in Croatia and Slovenia are presented herewith for the first time. 130 breeding adult Common Terns <italic>Sterna hirundo</italic> were measured between 2016 and 2019 along the Sava and Drava Rivers. Sex was determined for 53 birds: 22 males and 31 females. Significant sexual differences were found for head and bill length, length of bill to skull, and bill depth. Croatian and Slovenian terns had slightly shorter wings and tails compared to birds from the Netherlands, Germany and England and were lighter than birds from Germany and Italy. Head, bill and tarsus lengths were similar to those in north European populations. Contrary to results from Scotland, in our studied population, birds with head and bill lengths &gt;79.0 mm could not be sexed as males reliably.

<article-title>Morphometry of inland Common Terns <italic>Sterna hirundo</italic> in Croatia and Slovenia</article-title>

Morphometry of inland Common Terns  in Croatia and Slovenia

In 2018 and 2019, the breeding success of two Common Tern colonies on artificial lakes near the River Sava in Zagreb, Croatia, was studied. The colonies were visited weekly from May to July and we collected data on phenology, number of breeding pairs, clutch size as well as egg and chick survival. We also conducted a comparison between early and late breeders. Hatching and fledging success was within previously observed ranges, apart from a low hatching success on Siromaja in 2019. The smaller colony on Siromaja had a higher productivity in both years than the colony on Rakitje, although in 2018 an avian pox virus killed much of the late chicks on Rakitje. Early breeders seem to have had higher hatching success and average clutch size. Furthermore, a greater proportion of them managed to hatch all their eggs compared to late breeders, but the differences were not statistically significant. Our study provided baseline data for future monitoring of phenology and breeding success with regard to the management of breeding colonies.

<article-title>First data on breeding success of Croatian inland colonies of Common Tern <italic>Sterna hirundo</italic></article-title>

First data on breeding success of Croatian inland colonies of Common Tern 

Years ago, the Common Tern S<italic>terna</italic> h<italic>irundo</italic> was known to nest in Slovenia along larger watercourses. Today it only breeds locally in artificially built nesting areas. On the seashore, its nesting was confirmed for the first time in 1983, when 9 pairs bred in the Sečovlje Saltpans. In the same year, we started mapping the breeders in the Sečovlje Saltpans, which has continued till this very day. Since 2010, we have been systematically collecting data on the number of fledged birds. In 1991, the number of breeding pairs increased, which coincides with the increase in other parts of the Mediterranean. Since 1991, the size of the breeding population has been quite stable, ranging from 30 to 70 pairs. The Common Tern’s breeding success in the Sečovlje Saltpans is poor, mainly due to precipitation (40% of all unsuccessful nests) and predation (35%). Long, dry periods without rainfall have a positive effect on the hatching and fledging success. Appropriate water management, artificial islands and access to nesting sites control can prevent the disturbance caused by visitors and, in part, predators such as foxes and martens. At the Sečovlje Saltpans, the Common Tern’s survival depends entirely on the active management. The expected climate change, with increasing sea level rise and consequently more frequent flooding of low-lying areas, further aggravates its existence and survival in the Sečovlje Saltpans.

Krajinski park Sečoveljske soline, SOLINE Pridelava soli d.o.o., Seča 115, 6320 Portorož – SI

<article-title>37 years of Common Tern <italic>Sterna hirundo</italic> breeding at Sečovlje Salina</article-title>

37 years of Common Tern  breeding at Sečovlje Salina

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Editor-in-Chief: <A href="mailto:jurij.hanzel@dopps.si">Jurij Hanžel</A>, DOPPS - BirdLife Slovenija, Ljubljana, Slovenia Editorial Advisory Board dr. Bojidar Ivanov, Sofia, Bulgaria prof. dr. Franc Janžekovič, Maribor, Slovenia dr. Primož Kmecl, Ljubljana, Slovenia dr. Jelena Kralj, Zagreb, Croatia prof. dr. Lovrenc Lipej, Koper, Slovenia dr. Gordan Lukač, Paklenica, Croatia prof. dr. Roger H. Pain, Ljubljana, Slovenia dr. Nikolai V. Petkov, Sofia, Bulgaria prof. dr. Jenő J. Purger, Pécs, Hungary dr. Peter Sackl, Graz, Austria prof. dr. Peter Trontelj, Ljubljana, Slovenia Marko Tucakov, Novi Sad, Serbia Editors Iz ornitološke beležnice / From the ornithological notebook Dare Šere (Associate Editor), Ljubljana, Slovenia Language Editors Henrik Ciglič Contact Jurij Hanzel e-mail: <A href="mailto:jurij.hanzel@dopps.si">jurij.hanzel@dopps.si</A> DOPPS - BirdLife Slovenia Tržaška cesta 2 SI-1000 Ljubljana +386 1 426 58 75 Publisher De Gruyter Poland Bogumiła Zuga 32A Str. 01-811 Warsaw, Poland T: +48 22 701 50 15

<DIV align=justify> Please submit your manuscripts to Acrocephalus via email to: <A href="mailto:editor-acrocephalus@dopps-drustvo.si">editor-acrocephalus@dopps-drustvo.si</A> Open Access Statement The journal is an Open Access journal that allows a free unlimited access to all its contents without any restrictions upon publication to all users. <A href="https://content.sciendo.com/supplemental/journals/acro/acro-overview.xml/Open_Access_License.pdf">Open Access License</A> </DIV>

<DIV align=justify> Original work on all fields of ornithology, without any geographical limitation, is published in Acrocephalus. However, articles covering the south-eastern European and eastern Mediterranean regions are particularly encouraged. Review articles, original articles, points-of-view, specialist and scientific comments (Editorial, Forum), short communications, short notes ('From the ornithological notebook'), diploma abstracts and book reviews (New books) are considered for publication. Contributions can be published in English or Slovene.</DIV>

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Volume 40 (2019): Issue 180-181 (November 2019)

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