Johannes Wahl

Johannes Wahl
Dachverband Deutscher Avifaunisten | DDA

About

52
Publications
23,326
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,200
Citations
Citations since 2017
22 Research Items
698 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (52)
Article
Full-text available
With an average of around 1.1 million waterbirds present in January 2016–2018, spread across 71 native waterbird species, the international Rhine Valley from the Bodensee (Lake Constance) to the North Sea is a region of major conservation importance within Europe. In these three years, 25 species were recorded in internationally relevant numbers, h...
Article
Full-text available
Identifying climate refugia is key to effective biodiversity conservation under a changing climate, especially for mountain‐specialist species adapted to cold conditions and highly threatened by climate warming. We combined species distribution models (SDMs) with climate forecasts to identify climate refugia for high‐elevation bird species (Lagopus...
Article
Full-text available
Protected area networks facilitate community changes in responses to climate warming. However, the contribution of the site environmental and conservation-oriented characteristics to these responses to climate warming are not well understood. Here, we investigate how composition of non-breeding waterbird communities within the European Union Natura...
Preprint
Full-text available
Climate warming is driving changes in species distributions, although many species show a so-called climatic debt, where their range shifts lag behind the fast shift in temperature isoclines. Protected areas (PAs) may impact the rate of distribution changes both positively and negatively. At the cold edges of species distributions, PAs can facilita...
Article
Full-text available
Generating trend and population estimates from bird count data is challenging and a variety of factors have to be taken into account. We present an integrative statistical approach for estimating population numbers and trends for seabirds at sea. The method allows for the integration of bird‐count data from different sources and sampling schemes: o...
Technical Report
Full-text available
This report provides the third review of wintering waterbirds in the international Rhine Valley in the framework of the working programme of the International Commission for the Protection of the Rhine (ICPR). Monitoring of waterbirds is important as they represent internationally regarded nature values and information about their conservation stat...
Article
Full-text available
Analysis of coordinated Greater Scaup (Aythya marila) count data from the last 30 years showed a 38.1% decrease in wintering numbers in North-West Europe, from 309,000 during 1988–1991 to c.192,300 individuals during 2015–2018. Annual trends in wintering numbers differed throughout the range. Numbers decreased in the UK, Ireland, and in the Netherl...
Article
Full-text available
Every day, nature enthusiasts collect valuable information about local animal and plant populations. This has resulted in approximately 50 million data sets until now for the bird observations at ornitho.de alone, with the observation numbers having risen sharply during the last three years. Such data may not always meet all scientific criteria, bu...
Article
Full-text available
Climate warming is driving changes in species distributions and community composition. Many species show a so-called climatic debt, where shifts in range have lagged behind faster shifts in temperature isoclines. Inside protected areas (PAs), community changes in response to climate warming can be facilitated by greater colonization rates by warm-d...
Book
Vögel in Deutschland 2020 – in a nutshell Observing breeding birds in Germany • This publication focuses on breeding birds and how you can contribute to their recording. This can be done by reporting casual observations or by seizing one of the many opportunities for participation in breeding bird monitoring. These range from the recording of sing...
Article
Full-text available
Internationally coordinated censuses of Whooper Swans Cygnus cygnus across continental northwest Europe were undertaken in mid-winter 1995, 2000, 2005, 2010 and 2015. The estimate of 138,500 birds in 2015, the highest to date, represented a more than doubling of the population size (at an annual increase of 4.1%) since the first census total of 59,...
Book
High bird species richness in Germany • With more than 300 breeding bird species, Germany is among the most species-rich countries in Central Europe. Of these, 243 are classified as regular breeders, 25 as irregular breeders. Twenty species are neobiota, seventeen are considered extinct breeders. • Since 2010, four species were declared extinct: Ho...
Article
Full-text available
Thresholds for the application of the international 1 % criterion for migratory waterbirds in Germany – Update 2020 with suggestions for the application in seabirds: The international 1 % criterion states that a site is of international importance if it regularly supports 1 % of a biogeographic population of a waterbird species. The basis for det...
Article
Full-text available
Coordinated international censuses of the Northwest European Bewick’s Swan Cygnus columbianus bewickii population have been undertaken across the swans’ wintering range at c. 5-year intervals since 1984. During the early years of the study, numbers increased steadily to a peak of 29,780 individuals in January 1995, but then declined by 39.4% to 18,...
Article
Full-text available
Internationally coordinated censuses of Whooper Swans Cygnus cygnus across continental northwest Europe were undertaken in mid-winter 1995, 2000, 2005, 2010 and 2015. The estimate of 138,500 birds in 2015, the highest to date, represented a more than doubling of the population size (at an annual increase of 4.1%) since the first census total of 59,...
Article
Ornis Fennica 93: 12-25. 2016 We analysed annual changes in abundance of Eurasian Wigeon (Anas penelope) derived from midwinter International Waterbird Census data throughout its northwest European flyway since 1988 using log-linear Poisson regression modelling. Increases in abundance in the north and east of the wintering range (Norway, Sweden, De...
Article
Full-text available
Aim Many species are showing distribution shifts in response to environmental change. We explored (a) the effects of inter‐annual variation in winter weather conditions on non‐breeding distributional abundance of waterbirds exploiting different habitats (deep‐water, shallow water, farmland) and (b) the long‐term shift in the population centroid of...
Poster
Collecting data at large spatial scales is one of the major strengths of citizen science projects. To make such projects work well it has to be a win-win situation to everybody participating: The one who feeds in observations gets back maps, graphs and analyses (and knowledge!) showing the results of the effort of everybody, motivating her/him to f...
Article
Full-text available
National accounts suggest that the Common Pochard Aythya ferina was an uncommon breeding bird throughout western Europe before 1850. Extensions to the breeding range in the late 19th century were potentially aided by the rapid development of managed fish-ponds in eastern Europe, which provided suitable novel habitat at that time. Expansion into wes...
Article
Full-text available
We analysed annual changes in abundance of Eurasian Wigeon (Anas penelope ) derived from mid-winter International Waterbird Census data throughout its northwest European flyway since 1988 using log-linear Poisson regression modelling. Increases in abundance in the north and east of the wintering range (Norway, Sweden, Denmark, Germany, Swit - zerla...
Article
Full-text available
Species are responding to climate change by changing their distributions, creating debate about the effectiveness of existing networks of protected areas. As a contribution to this debate, we assess whether regional winter abundances and distribution of the Smew Mergellus albellus, a migratory waterbird species listed on Annex I (EU Birds Directive...
Book
Full-text available
Vögel in Deutschland 2014 – in a nutshell Species diversity in continuing decline •Since the end of the 1990s the situation of the 248 bird species breeding in Germany has worsened: The population of every third breeding bird species is declining. • Are we on the brink of a Silent Spring? Especially common and widely distributed song bird specie...
Article
Full-text available
Predicting population sizes and dynamics of mobile organisms is important for trend estimation, but this is difficult when the origin of individuals cannot be determined, i.e. residents and migrants are indistinguishable in the field. Here we examine fluctuations in populations during the non-breeding season (autumn to spring) of seven waterbird sp...
Article
Full-text available
Climate change is predicted to cause changes in species distributions and several studies report margin range shifts in some species. However, the reported changes rarely concern a species' entire distribution and are not always linked to climate change. Here we demonstrate strong north-eastwards shifts in the centres of gravity of the entire winte...
Article
Full-text available
The first German Red List of Migratory Birds (RLMB) is presented here by the national Committee for Red Data Birds (comprised of six ornithologists from various scientific institutions and organisations). This list will complement the fourth issue of the German Red List of Breeding Birds and is based on the general classification system developed a...
Book
Full-text available
Vögel in Deutschland 2013 – in a nutshell Bird conservation: Aims and facts • In adopting the 2020 Biodiversity Strategythe EU and its member states committed to improve the conservation status of bird species: By 2020, compared to current assessments 50% more species assessments under the Birds Directive show a secure or improved status. • The E...
Article
Full-text available
The Eurasian Golden Plover is a species that is inadequately covered by standard European monitoring schemes, largely due to its terrestrial passage and wintering habitats. This paper reports on the second attempt at an international coordinated survey of autumn passage birds at a time when they are most concentrated in the smallest areas. In Octob...
Book
Full-text available
Vogelmonitoring in Deutschland ist ein facettenreiches Thema – dieses Buch stellt die aktuellen Konzepte der ehrenamtlich getragenen Programme in komprimierter Form dar: • Monitoring häufiger Brutvögel • Monitoring seltener Brutvögel • Monitoring rastender Wasservögel Die Arbeitsteilung zwischen den einzelnen Programmen wird ebenso verdeutlicht w...
Book
Full-text available
This report outlines the results of the coordinated census of wintering waterbirds in the Baltic Sea 2007–2009 undertaken under the SOWBAS project (Status of wintering Waterbird populations in the Baltic Sea). The international co-ordination and analyses of the waterbird census was funded by a grant from the Nordic Council of Ministers, and the sur...
Article
Detecting coherent signals of climate change is best achieved by conducting expansive, long-term studies. Here, using counts of waders (Charadrii) collected from ca. 3500 sites over 30 years and covering a major portion of western Europe, we present the largest-scale study to show that faunal abundance is influenced by climate in winter. We demonst...
Article
Full-text available
Synchronous counts of roding Woodcocks Scolopax rusticola allow for reasonable population estimates for breeding bird atlases As part of the Germany-wide breeding bird atlas especially semi-common species are mapped by volunteer birdwatchers (the abundance of common species is calculated from sample plots, rare and colonially breeding species are c...
Article
Full-text available
As part of the fi rst pan-European Cormorant midwinter census Great Cormorants were counted at their night roosts in Germany in mid-January 2003. A total of 500 roosts were controlled (including 158 unoccupied roosts/waterbodies). In neighbouring countries close to the German border another 18 roosts were checked (two of which did not hold birds)....
Article
Full-text available
Zusammenfassung Im Zeitraum vom 15. März bis 15. Mai 2004 wurden die Gesangsreviere der Feldlerche im Stadtgebiet von Münster (Westfalen) als Wiederholung einer 1997 erfolgten ersten Übersichtskartierung erfasst. Fast 30 ehrenamtliche Ornithologen des NABU Münster kartierten in den 23 Teilgebieten Feldlerchen nach der Revierkartierungsmethode, zusä...
Article
Full-text available
Wahl, J., J. Blew, S. Garthe, K. Günther, J. Mooij & C. Sudfeldt (2003): Waterbirds wintering in Germany – trends and population estimates for 1990-2000. Ber. Vogel-schutz 40: 91-103. In 1994 BirdLife International published " Birds in Europe – their conservation status " (TUCKER & HEATH 1994). This comprehensive overview on trends and numbers of b...
Article
Full-text available
Anthes N., Harry I., Mantel K., Mller A., Schielzeth H., Wahl J. 2002. Notes on migration dy- namics and biometry of the Wood Sandpiper (Tringa glareola) at the sewage farm of Mnster (NW Germany). Ring 24, 1: 41-56. This paper summarises results of almost daily counts of Wood Sandpiper and an extensive ringing and colour-marking scheme at the sewag...
Article
Full-text available
Winter season waterbird counts have been a main emphasis of the work of German birdwatchers since 1966/67. From its foundation in the 1970s the Feder- ation of German Avifaunists (DDA) has coordinated most of the programmes in the western part of Ger- many and, since the reunification, throughout the country. More than 2,000 volunteers participate...

Network

Cited By