https://boap.uib.no/index.php/ornis/issue/feedOrnis Norvegica2024-02-25T12:45:10+01:00Arild Johnsenarild.johnsen@nhm.uio.noOpen Journal Systems<p>Ornis Norvegica is a peer-reviewed, online and open access journal publishing papers in all fields of ornithology. Both subscription and publishing are free of charge.</p> <p>Former Cinclus (Vol. 1, 1978) and Fauna Norv. ser. C., Cinclus (Vol. 2-21, 1979-1999) </p> <div class="call_for_paper"> <div style="line-height: 0pt; clear: both;"> </div> </div>https://boap.uib.no/index.php/ornis/article/view/3953Negative population trend of the Reed Bunting Emberiza schoeniclus in an important wetland in southeastern Norway2023-05-31T15:07:08+02:00Thomas Sætherthomas.sather@medisin.uio.noTrude StarholmTrude.Starholm@mia.noErling Hobølerling.hobol@gmail.com<p><strong>Cover photo:</strong> Singing Reed Bunting <em>Emberiza schoeniclus</em> at Årnestangen, Nordre Øyeren nature reserve. Photo: Øyvind Hagen.</p> <p>The Reed Bunting <em>Emberiza schoeniclus</em> is considered the most common of the five species of Emberiza buntings breeding in Norway and is currently listed as a species of Least Concern. However, a complete census of territorial male Reed Buntings conducted in the Nordre Øyeren nature reserve in 2019 showed a decline in the local breeding population of 67% compared to the last counts completed 40 years ago. Censuses were conducted in 1976 and 1981 in the same area and with the same methods. Analyses of citizen science data from the Norwegian Biodiversity Information Centre also show a similar decreasing trend (-66%) for the Reed Bunting breeding population in Nordre Øyeren from 1976 to 2019. Moreover, image analyses of the census maps show that that the number and density of Reed Bunting territories have decreased locally and probably has done so since early 1980s. Interestingly, a subset of localities within the survey area still have the same territory densities as the 1976 and 1981 censuses. We suggest that changes in habitat, vegetation and farming practice, especially grazing, could be the underlying cause of variation in bird numbers. Our results indicate a negative population trend for the Reed Bunting locally, a tendency that is also observed regionally in the Nordic countries. Taken together, local and regional declines raise concerns about the conservation status of the Reed Bunting in Norway.</p>2024-03-20T00:00:00+01:00Copyright (c) 2024 Thomas Sæther, Trude Starholm, Erling Hobølhttps://boap.uib.no/index.php/ornis/article/view/3626Effects of artificial light and latitude on the dawn foraging activity of Great Tits (Parus major) during winter in northern Europe2022-04-26T13:36:49+02:00Karoline Aasen Skrytenkarolineskryten@gmail.comRonny Steenronny.steen@nmbu.noSvein Dalesvein.dale@nmbu.no<p><strong>Cover photo:</strong> Male Great Tit <em>Parus major</em>. Photo: Bjørn Aksel Bjerke.</p> <p>Recently, there has been increasing interest in the ecological consequences of artificial light on wildlife. At northern latitudes, winter is characterized by short days and low temperatures. Under these conditions, resident birds need to consume more food in a shorter time to sustain their metabolism and maintain body temperature. Access to artificial light may prolong foraging opportunities for resident birds during winter. Here, we used a field experiment to test whether Great Tits <em>Parus major</em> benefit from artificial light to start foraging before sunrise. Further, we conducted a meta-analysis to test if onset of foraging was correlated with latitude in the Great Tit. A feeding station with artificial light was placed in a forest area in Ås, SE Norway, at nearly 60° north. A camera was placed in front of the feeding station to record daily activity of the Great Tit in December and February. In December, Great Tits started foraging earlier relative to sunrise when artificial light was available. In February, Great Tits were not stimulated by artificial light to start foraging before sunrise. The onset of foraging in Great Tits was also correlated with latitude. At the northernmost location, Great Tits started foraging several hours before sunrise, whereas at the southernmost location, Great Tits started foraging only a few minutes before sunrise. The results suggest that resident Great Tits may utilize artificial light to prolong their foraging activity during midwinter, and that onset of foraging is advanced relative to sunrise with decreasing daylength further north. Our findings contribute to the understanding of how short days during northern winters can limit foraging activity in resident birds.</p>2024-02-25T00:00:00+01:00Copyright (c) 2024 Karoline Aasen Skryten, Ronny Steen, Svein Dale