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What restricts generative rejuvenation of Calluna vulgaris in continental, dry heathland ecosystems: seed production, germination ability or safe site conditions?

100%

Henning K. , von Oheimb G. , Tischew S.

Ecological Questions

2015

tom 21

A large-scale field experiment with different management options (free-range grazing, onetime cutting, additional disturbances and their interactions) was carried out in a continental, dry heathland. Within the framework of the experiment seed production and germination ability of over-aged Calluna individuals as well as specific safe site conditions were investigated to reveal restricting factors for the generative rejuvenation of Calluna. The calculated values of seed production and germination ability of over-aged Calluna individuals can be compared with those from literature or exceed the values reported there. Therefore, seed production and germination ability are not the limiting factors for the generative rejuvenation of Calluna. Free-range grazing with large herbivores combined with onetime cutting of over-aged Calluna stands supports the generative rejuvenation, especially due to the creation of specific safe sites, which are crucial for a successful survival of Calluna seedlings. Particularly a light shadowing seems to be the restricting factor for a successful generative rejuvenation of Calluna in continental, dry heathlands.

Outbreak of a Chlamydophila psittaci infection in laboratory rats

100%

Henning K. , Reinhold P. , Hotzel H. , Moser I.

Bulletin of the Veterinary Institute in Puławy

2008

tom 52

nr 3

Daring a study on Trypanosoma equiperdum propagation in adult male Wistar rats, four rats died spontaneously. Two of the dead animals were subjected to post mortem examination. From different organs of the rats, chlamydiae were isolated and confirmed by PCR and DNA sequencing as Chlamydophila psittaci. The results show that infection with Chlamydophila psittaci may occur in laboratory rats. Such outbreaks may have influence on the results of experimental studies. Chlamydial infections in laboratory animals also pose risk to humans (zoonosis).

Free-range grazing by large herbivores in degraded large-scale dry sandy grassland-heathland ecosystems

88%

Seifert R. , Lorenz A. , Osterloh S. , Henning K. , Tischew S.

Ecological Questions

2015

tom 21

Free-range grazing by large herbivores combined with one-time mowing of over-aged heathlands offers an excellent management tool to maintain and enhance biodiversity in degraded large scale, low productive, semi-open dry sandy grassland-heathland ecosystems. Grazing improves habitat quality, supports typical species communities and represses invasive species.

Free-living amoebae may serve as hosts for the Chlamydia-like bacterium Waddlia chondrophila isolated from an aborted bovine foetus

88%

Michel R. , Steinert M. , Zoller L. , Hauroder B. , Henning K.

Acta Protozoologica

2004

tom 43

nr 1