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Publications (17)2.19 Total impact

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    Full-text · Dataset · Jul 2015
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    ABSTRACT: Kainizmus, hniezdny manažment v Nemecku v rokoch 2004–2007 a satelitné sledovanie mláďat orla krikľavého (Aquila pomarina) Bergmanis U 2008: Cainism, nestling management in Germany in 2004–2007 and satellite tracking of juveniles in the Lesser Spotted Eagle (Aquila pomarina). Slovak Rapt J 2: 53–72. Abstract: The Lesser Spotted Eagle belongs to a species with obligatory cainism, which means that in the natural state it is rare that two young eagles fledge, although as a rule two chick's hatch. The breeding population in Germany is at the western edge of the species' range and is declining (a 23% decrease between 1993 and 2007). Local extinction can be anticipated and therefore nestling management has been implemented in the German federal state of Brandenburg since 2004 as a conservation measure by using human intervention to prevent the death of the younger sibling. This is in addition to other methods such as nest-site protection, habitat preservation, legislation etc. Furthermore, in 2007, second hatched eagle chicks (Abels) from Latvia were translocated for the first time. The managed pairs (nests physically inspected) were on average more successful than the unmanaged pairs (nests not physically inspected). It cannot be determined as to whether the inspection of the nests had a negative effect on breeding. Breeding success of the pairs present in Brandenburg, including non-breeders, increased by 57 % in 2007 due to nestling management, and that of the managed pairs alone by 67 %. In 2007 the behaviour of six young eagles was studied using satellite telemetry. This study determined that the Abels migrated as well as the first hatched eagle chicks (Cains), and that their survival chances were equally good. The Abels imported from Latvia migrated in two out of three cases along the same route as the German Lesser Spotted Eagles to the Bosporus. One Latvian Abel which fledged in Germany was tracked by satellite to Zambia where many Lesser Spotted Eagles winter. A German Abel wintered North of the Equator in the Sudan and neighbouring countries for over six months and started its return migration on 27 April 2008. Abstrakt: Orol krikľavý je druh s pravidelným kainizmom, čo v prirodzených podmienkach spôsobuje len výnimočne vyletenie dvoch mláďat napriek vyliahnutiu dvoch mláďat zo znášky. Hniezdiaca populácia v Nemecku sa nachádza na západnom okraji areálu druhu a jej veľkosť klesá (23% pokles v období 1993–2007). Je možné očakávať lokálne vyhynutie, preto sa od roku 2004 v Nemeckej spolkovej republike Brandenbursko používa ako prostriedok ochrany hniezdny manažment. Predstavuje ľudskú inter-venciu s cieľom zabrániť smrti mladšieho súrodenca spoločne s ďalšími metódami napr. ochrana hniezdisk a habitatov, legislatíva atď. V roku 2007 sa prvýkrát premiestnili z Lotyšska druhé vyliahnuté mláďatá (Ábelovia). Manažované hniezda (s priamou kon-trolou) boli priemerne úspešnejšie ako hniezda bez manažmentu (priamej kontroly). Negatívny vply kontrol hniezd na hniezdnu úspešnosť nebol rozhodujúci. Hniezdna úspešnosť párov vyskytujúcich sa v Brandenbursku, zahŕňajúc aj nehniezdiace jedince, vzrástla kvôli hniezdnemu manažmentu na 57 % v roku 2007, pri manažovaných pároch samotných na 67 %. V roku 2007 sa študovalo satelitnou telemetriou správanie sa šiestich mladých orlov. Štúdia ukázala, že Ábelovia migrovali aspoň tak ako prvé vyliahnuté orlíčatá (Kainovia) a ich šance na prežitie boli rovnako dobré. Ábelovia privezení z Lotyšska migrovali k Bosporu v dvoch z troch prípadov po rovnakých trasách ako nemecké orly krikľavé. Jeden lotyšský Ábel, ktorý vyletel v Nemecku, bol sledovaný satelitom do Zambie, kde zimuje veľa orlov krikľavých. Nemecký Ábel zimoval severne od rovníka v Sudáne a v oko-litých krajinách viac ako šesť mesiacov pričom začal migráciu späť 27. apríla 2008.
    Full-text · Article · Jan 2008
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    T. LANGGEMACH

    Preview · Article · Jan 2008
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    Torsten Langgemach · Wolfgang Scheller · Matthias Weber

    Full-text · Article · Jan 2005
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    Torsten Langgemach · Jochen Bellebaum
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    ABSTRACT: Langgemach, T. & J. Bellebaum 2005: Predation and the conservation of ground-breeding birds in Germany. Vogelwelt 126: 259 – 298. As a consequence of their long-lasting decline in numbers many ground-breeding bird spe-cies in Germany are in a critical situation. Within the last 15 years there has been increasing evidence for low reproductive success as the main cause of this decline. Various studies show that predation plays a major role in this context. In this review we collate and analyse scientific data on the present extent of the problem, the species involved, the role of habitat changes in this context and finally management strategies to solve the problem. In most cases where field studies revealed predation as a threat at the population level, predatory mammals had the most severe impact, first of all Red Foxes. The role of introduced carnivores like Raccoon, Raccoon Dog, and American Mink is not yet sufficiently investigated. Galliform birds, waders and the Great Bustard appear to be most severely affected. Loss and deterioration of breeding habitats within recent decades have led to worse environmental conditions for many ground-breeding birds and improved the nutritional basis for the populations of several predator species, resulting in a simultaneous decrease of ground-breeders an increase of their predators. Rabies immunisa-tion is only a small part in this structure. Although eggs, young or adult birds form only a small proportion of the diet of most predators, high predator densities can have serious consequences for prey species. Paradoxically elevated predation rates became evident mainly in reserves where the impacts of agriculture have been successfully reduced. In some cases habitat management seems to support predators and also voles as their main prey. Most field studies focused on selected aspects and single species in small study areas for short study periods. Their results do not show a uniform pattern but at least prove the complex-ity of predator-prey relationships and the environmental factors governing them. Thus, our understanding of these relationships and the development of conservation measures remain unsatisfactory. The approaches for management against elevated predation range from habitat management over attempts to control relevant predators by lethal or non lethal means to the protection of nesting sites or single nests. Practical applications of the different methods did not yet achieve a long lasting success although some of the methods show a potential to reduce predation pressure. Several methods either need further development and testing or a more consequent application. Combination of different means seems to be favourable. Some methods only make sense for very rare species but are not appropriate for application in general. In the case of forest birds information on the influence of predation and management approaches is still scarce. There is an urgent need for further research and development. At the same time the available management methods that proved to be successful should be applied immediately and consistently. Otherwise some of our target species will disappear in the next few years.
    Full-text · Article · Jan 2005
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    Bernd-U Meyburg · Torsten Langgemach · Kai Graszynski · Jörg Böhner
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    ABSTRACT: Since about 1800 the total breeding area of the Lesser Spotted Eagle Aquila pomarina in Germany has shrunk by some 90 % from a then 83,000 km 2 to a small residual area today of some 10,000km 2 . The western border of the breeding range has shifted several hundred kilometres eastwards. The reasons for this decline were a massive annihilation campaign of shooting and egg theft. Increasing habitat loss became a negative factor only in the course of the 20 th century. At present the species breeds only in the federal Länder (States) Mecklenburg–West Pomerania, Brandenburg and Saxony–Anhalt in relatively small areas of 6,600, 3,600 and. 13km 2 respectively. In 2001 the total population consisted of some 115 breeding pairs. Today the reasons for the continuing decline are principally habitat changes and hunting on migration routes. As long as the causes of the present population limitation persist, and protection measures are not intensified, the negative trend in Germany will continue, in the worst case until the species becomes extinct. An action plan to rescue the species is therefore urgently required. The protection measures determined must also be implemented rapidly in order to prevent a further population decline and, if possible, promote an increase.
    Full-text · Article · Jan 2004
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    O. Krone · T. Langgemach · P. Sömmer · N. Kenntner

    Full-text · Article · Jan 2003
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    Oliver Krone · Torsten Langgemach · Paul Sömmer · Norbert Kenntner
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    ABSTRACT: White-tailed Sea Eagles Haliaeetus albicilla found moribund or dead in the field were submitted for necropsy to the Institute for Zoo and Wildlife Research (IZW) and to the Institute for Food, Drugs and Animal Diseases (ILAT), Berlin, Germany. The moribund eagles had died in rehabilitation stations or were euthanized. Onehundred-twenty White-tailed Sea Eagles were examined between 1990 and 2000, comprising 47% females, 38% males, and 15% undetermined. Nearly half (47.5%) of the birds were adult, 12.5% were subadult, 34% immature, 3% nestlings and in 3% no age class could be determined. The main causes of death in White- tailed Sea Eagles were collisions with trains (14%), lead intoxication (12%), infectious diseases (11%), trauma (10%), electrocution (9%), collision with wires (7%), injuries sustained during intra-specific conflict (5%), poisoning (3%), malformation (2%), and starvation (1%). Because of their decomposed condition no diagnosis could be made in 29 cases. The White-tailed Sea Eagle was documented as a new host for four nematode and one trematode species. For the first time trematode Metorchis was shown to be pathogenic to White-tailed Sea Eagles resulting in the death of six birds. Gunshot pellets were found in five out of 58 birds radiographed.
    Full-text · Article · Dec 2002
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    O. Krone · T. Langgemach · P. Sömmer · N. Kenntner

    Full-text · Article · Dec 2002
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    ABSTRACT: A total of 1149 free-living birds of prey from Germany were examined for blood parasites. The prevalence of infection was 11% (adult birds 18%, immature birds 16%, nestlings 4%). Among the Falconiformes 11% of 976 birds were infected, and 13% of 173 Strigiformes. Out of 17 falconiform species nine were infected with blood parasites whereas the Eurasian buzzard (Buteo buteo) had the highest prevalence for haematozoa; i.e. Leucocytozoon toddi (31%), the highest prevalence (25%) for Haemoproteus sp. was found in the hobby (Falco subbuteo). Eight species of owls were examined for blood parasites; the tawny owl (Strix aluco) had the highest prevalence with Haemoproteus syrnii (22%). In the one pygmy owl (Glaucidium passerinum) examined Trypanosoma avium and Plasmodium (Giovannolaia) fallax were detected. The white-tailed sea eagle (Haliaeetus albicilla) was found to be a host of L. toddi for the first time. Differences in the prevalence of blood parasites were found in the seasons and age classes of the birds but not between birds admitted to a rehabilitation centre or samples in the wild, the sexes, bird orders and the regions.
    Full-text · Article · Nov 2001 · Acta Protozoologica
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    ABSTRACT: Four hundred forty-eight blood plasma samples from free-living birds of prey from Berlin and the Brandenburg area in eastern Germany were tested for antibodies against Newcastle disease virus (NDV), falcon herpesvirus (FHV), owl herpesvirus (OHV), and Chlamydia psittaci. Antibodies to NDV were detected in 6 (2%) of 346 tested diurnal birds of prey, whereas none of the owls (n = 55) was positive. The positive samples originated from two common buzzards (Buteo buteo), three ospreys (Pandion haliactus) and one marsh harrier (Circus aeruginosus). Titers varied between 1:8 and 1:32. Of 253 birds of prey one osprey (<1%) tested positive for antibodies to FHV with low titer of 1:6. This is the first detection of antibodies against FHV in an osprey. Furthermore, antibodies against OHV could be found in one tawny owl (Strix aluco) and one common buzzard (2 of 253, 1%) with low titers of 1:6. Of 422 birds of prey 267 (63%) tested positive for antibodies to Chlamydia psittaci with titers varying between 1:5 and 1:256 which reflects the ubiquitous occurrence of Chlamydia psittaci in these birds of prey.
    Preview · Article · Feb 2001 · Journal of wildlife diseases
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    ABSTRACT: The Lesser Spotted Eagle belongs to a species with obligatory cainism, which means that in the natural state it is rare that two young eagles fledge, although as a rule two chick's hatch. The breeding population in Germany is at the western edge of the species' range and is declining (a 23% decrease between 1993 and 2007). Local extinction can be anticipated and therefore nestling management has been implemented in the German federal state of Brandenburg since 2004 as a conservation measure by using human intervention to prevent the death of the younger sibling. This is in addition to other methods such as nest-site protection, habitat preservation, legislation etc. Furthermore, in 2007, second hatched eagle chicks (Abels) from Latvia were translocated for the first time. The managed pairs (nests physically inspected) were on average more successful than the unmanaged pairs (nests not physically inspected). It cannot be determined as to whether the inspection of the nests had a negative effect on breeding. Breeding success of the pairs present in Brandenburg, including non-breeders, increased by 57 % in 2007 due to nestling management, and that of the managed pairs alone by 67 %. In 2007 the behaviour of six young eagles was studied using satellite telemetry. This study determined that the Abels migrated as well as the first hatched eagle chicks (Cains), and that their survival chances were equally good. The Abels imported from Latvia migrated in two out of three cases along the same route as the German Lesser Spotted Eagles to the Bosporus. One Latvian Abel which fledged in Germany was tracked by satellite to Zambia where many Lesser Spotted Eagles winter. A German Abel wintered North of the Equator in the Sudan and neighbouring countries for over six months and started its return migration on 27 April 2008. Abstrakt: Orol krikľavý je druh s pravidelným kainizmom, čo v prirodzených podmienkach spôsobuje len výnimočne vyletenie dvoch mláďat napriek vyliahnutiu dvoch mláďat zo znášky. Hniezdiaca populácia v Nemecku sa nachádza na západnom okraji areálu druhu a jej veľkosť klesá (23% pokles v období 1993-2007). Je možné očakávať lokálne vyhynutie, preto sa od roku 2004 v Nemeckej spolkovej republike Brandenbursko používa ako prostriedok ochrany hniezdny manažment. Predstavuje ľudskú inter- venciu s cieľom zabrániť smrti mladšieho súrodenca spoločne s ďalšími metódami napr. ochrana hniezdisk a habitatov, legislatíva atď. V roku 2007 sa prvýkrát premiestnili z Lotyšska druhé vyliahnuté mláďatá (Ábelovia). Manažované hniezda (s priamou kon- trolou) boli priemerne úspešnejšie ako hniezda bez manažmentu (priamej kontroly). Negatívny vply kontrol hniezd na hniezdnu úspešnosť nebol rozhodujúci. Hniezdna úspešnosť párov vyskytujúcich sa v Brandenbursku, zahŕňajúc aj nehniezdiace jedince, vzrástla kvôli hniezdnemu manažmentu na 57 % v roku 2007, pri manažovaných pároch samotných na 67 %. V roku 2007 sa študovalo satelitnou telemetriou správanie sa šiestich mladých orlov. Štúdia ukázala, že Ábelovia migrovali aspoň tak ako prvé vyliahnuté orlíčatá (Kainovia) a ich šance na prežitie boli rovnako dobré. Ábelovia privezení z Lotyšska migrovali k Bosporu v dvoch z troch prípadov po rovnakých trasách ako nemecké orly krikľavé. Jeden lotyšský Ábel, ktorý vyletel v Nemecku, bol sledovaný satelitom do Zambie, kde zimuje veľa orlov krikľavých. Nemecký Ábel zimoval severne od rovníka v Sudáne a v oko- litých krajinách viac ako šesť mesiacov pričom začal migráciu späť 27. apríla 2008.
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    Torsten Langgemach · Paul Sömmer · Wolfgang Kirmse · Christian Saar · Gert Kleinstäuber Langgemach · P Sömmer · W Kirmse · C Saar · G Kleinstäuber
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    ABSTRACT: 1997: First recent record of tree-nesting Peregrine Falcons Falco p. peregrinus in Brandenburg, Germany, twenty years after the extinction of the European tree-nesting population. Vogelwelt 118: 79 – 94. Nesting in trees is an ecological peculiarity of certain Peregrine Falcon populations, a species which primarily nests in cliffs or on the ground. Worldwide there were only three regions where breeding in trees regularly occurred. The largest such population was in Europe, from northern Germany to western Russia. It became extinct in the mid 1970s, partly as a conse-quence of excessive pesticide use. A recovery project started in 1990 by the "Arbeitskreis Wanderfalkenschutz" and "Deutscher Falkenorden" resulted in the first pair of Peregrines breeding in a tree nest in northern Brandenburg in 1996. Both adults were colour-ringed and had been released in 1994 as part of a reintroduction program. They bred successfully in an old kite Milvus spec. nest in a pine tree. The nest site resembled the classic type used by the extinct population. 580 hours of nest observation enable us to give a detailed account of the activities of the pair and its young. The key points were: adults first seen at breeding site on 1st March, incubation started 18th March, first chick hatched 19th April (incubation period about 33 days); three young hatched; one chick died (probably fell off the nest); the young male left the nest at the age of 42 days (31st May) and first flew at 45 days; the young female also first took flight three days after leaving the nest (7th June); last sighting of a juvenile was on 3rd August; adults returned regularly to nest site from beginning of September. Peculiari-ties of the breeding record are dicussed, e. g. the young age of the adults (both two years old), early start to egg-laying despite winter weather conditions, special hunting strategy (largely hunting from perches) with high success rate, prey including bats and insects. There were suggestions of potential tree-breeding pairs at four other sites in north-eastern Germany. The situation in 1996 gives cause for optimism regarding the potential for recovery of a tree-nesting population of Peregrines within its former range.
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    Jörg Böhner · Torsten Langgemach
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    ABSTRACT: Monitoring data for the Lesser Spotted Eagle Aquila pomarina in the federal state of Brandenburg (Germany) since 1994 indicate a slight but significant population decline. We used a computer programme (Vortex) to calculate which values of certain population parameters correspond best to the current development, and, in a second step, to simulate the effects of changes in reproduction and mortality. The results indicate that already an increase in breeding success of 7–10% would stabilise the population at the present level. Currently, this proportion corresponds to the annual number of 2–3 pairs which fail to breed successfully due to human interference in a broad sense. Therefore, land owners, foresters, and agencies involved in landscape development can contribute to the recovery of the population by making sure that the specific requirements of the species at the breeding site are met, most important a lack of disturbance. The results also indicate that a further decline in reproductive output would speed up the current negative development. A similar effect would be caused by a yet increasing mortality on migration, mainly due to shooting, whereas lowering this rate by just a few percent would already stabilise the population at the current level. To achieve this goal, however, international efforts are necessary, especially in the eastern Mediterranean. Provided that optimal breeding habitat is available and human persecution on migration ceases, a population increase could effectively be supported by a management that prevents the killing of the younger sibling by its older nest mate, and, therefore, results in two fledglings per successful pair. 5 additional juveniles gained annually in this way would cause an increase of about 50% within 25 years.
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    Torsten Ryslavy · Mathias Putze · Torsten Langgemach
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    ABSTRACT: Results of radio-tagging of released Great Bustards in Brandenburg 1999 to 2002. In the course of the German Great Bustard conservation project 48 hand-raised individuals were radio- tagged from 1999 to 2002 before release into the wild. Based on first experiences in 1992/93, and additio- nal trials in captivity, males were fitted with tail-mounted tags whereas females were fitted with neckla- ces. The project is principally aimed at improving control of the process of setting the birds free. Accordingly basic scientific results were not obtained but a lot of new information on locations of the birds were recorded, preferred locations, behaviour, causes of mortality and integration into the wild population.After joining groups of wild birds, these were then marked indirectly by the radio-tagged juve- niles, so additional data were obtained for these individuals. In some cases isolated birds in situations considered risky could be detected, caught and brought back to their group. Three radio-tagged females born in 2001 could begin breeding in 2003 and are supposed to be detected at the breeding place by their transmitters. Problems arose mainly due to failing transmitters; problems or risks for the tagged birds were less significant. An unresolved problem is the tag attachment for males as the tail-mounted tags are lost through moult as early as September. Despite these problems the project will be continued over the next few years as many of the results are more or less relevant to conservation.
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    T. Langgemach
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    ABSTRACT: Fünf Jahre nach der letzten Bilanz werden erneut Situation und Schutz des Seeadlers in Branden- burg analysiert. Der Bestand hat bei guter, leicht steigender Reproduktion weiter zugenommen und in den Jahren 2000 und 2001 103 besetzte Reviere erreicht. Bei insgesamt guten Aussichten deutet dennoch eine Reihe von Problemen die Grenzen der gegenwärtigen Entwicklung an, vor allem fort- schreitender Landschaftsverbrauch, zunehmende Störpotenziale in der Landschaft und ein hoher Anteil anthropogen bedingter Individuenverluste an der Gesamtmortalität. Dazu zählt neben Ver- lusten durch Stromleitungen, Verkehr und Bleivergiftungen auch immer noch illegale Verfolgung. Vor dem Hintergrund der hohen Verantwortung Brandenburgs für die Wiederbesiedelung westlich angrenzender Gebiete ist es ein positives Signal, dass das brandenburgische Ministerium für Land- wirtschaft, Umwelt und Raumordnung nun auch offiziell ein Artenschutzprogramm für die Adler- arten in Auftrag gegeben hat.
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    Torsten Langgemach · Torsten Ryslavy
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    ABSTRACT: 1 Einleitung Noch vor einhundert Jahren haben landwirtschaftlich genutzte Lebensräume in Bran-denburg eine üppige und mannigfaltige Vogelwelt beherbergt (HESSE 1910, SCHALOW 1919, MEISEL 2003). Kurze Zeit später schreibt HESSE (1914) allerdings schon: "Die einstigen Vögel der einstigen Luche müsste ich eigentlich schreiben …, denn leider sind der nimmersatten Kultur nunmehr auch … die Luche des Havellandes … zum Opfer gefallen". Einige Jahrzehnte später konnten Ornithologen in Brandenburg zwar immer noch stolz darauf sein, dass Arten wie Großtrappe oder Seggenrohrsänger ihren deut-schen Verbreitungsschwerpunkt hier hatten (GEWALT 1959, WAWRZYNIAK & SOHNS 1977), doch die erste Gesamtschau über die Vogelwelt der Region nach SCHALOW (1919) zeigte trotz deutlich gestiegener Beobachterdichte Rückgänge und Bestandslü-cken auf (RUTSCHKE 1983). Heute zählen Arten der Agrarlandschaft in ganz Deutsch-land zu den Sorgenkindern des Vogelschutzes (u. a. SUDFELDT et al. 2009). Am Beispiel des Landes Brandenburg soll deshalb ein kurzer Überblick über die Bestandsentwick-lung von Vogelarten der Agrarlandschaft in den letzten 15 Jahren gegeben werden. 2 Material und Methodik Für den Zeitraum 1995-2006 wurden im Rahmen der aktuellen Rote Liste des Landes Brandenburg für die Brutvogelarten die Bestände und Bestandstrends dargestellt (RYS-LAVY & MÄDLOW 2008). Die Datengrundlagen dafür waren insbesondere:  die bis 2007 vorliegenden Ergebnisse der Brutvogel-Atlaskartierung (ADE-BAR),  die Ersterfassung in den Europäischen Vogelschutzgebieten,  Daten des "Monitorings seltener Brutvogelarten" (MsB),  Daten des "Monitorings häufiger Brutvogelarten" (MhB) mit den Methoden "Revierkartierung" und "Punkt-Stopp-Zählung",  Daten des "Monitorings Greifvögel und Eulen" (MGE). Auf diesen Grundlagen erfolgt hier eine Aktualisierung bis zum Jahr 2009 für 42 aus-gewählte Brutvogelarten, deren Vorkommensschwerpunkte in der Agrarlandschaft lie-gen (Tab. 1). Darunter sind auch fünf Arten, die zwar überwiegend nicht in der Agrar-landschaft brüten, deren Nahrungsbasis aber in starkem Maße davon abhängt: Weiß-storch, Mäusebussard, Rotmilan, Turmfalke und Schleiereule. Nicht betrachtet wurden Arten des ländlichen Raums, die sowohl hinsichtlich Brut als auch Nahrung vom Sied-lungsbereich abhängen und damit in ihrer Bestandsentwicklung vor allem durch dort stattfindende Veränderungen beeinflusst werden. Dazu zählen z. B. Rauchschwalbe und Haussperling.
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