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25 March 2016
RAVON is sending this newsletter to all international volunteers or professionals who help us with our work protecting reptiles, amphibians and fish in the Netherlands. In this way, we can keep you in touch with our activities. Should you not wish to be on the mailing list, please send an e-mail to redactie@ravon.nl.
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eDNA metabarcoding of fish and amphibians
Do you want to get information on the occurrence of fish and amphibians from a water sample? Then eDNA metabarcoding is a possibility. Recently, an article on this has been published in Molecular Ecology, the result of a collaboration between international partners including RAVON. The article describes the results of studies carried out in France, the Netherlands and Denmark and shows that in general eDNA metabarcoding detects more species than traditional monitoring methods. This has been tested in a large variety of habitats: streams, rivers, ponds, ditches, lakes and even in the sea. The method looks very promising for implementation in monitoring programs for aquatic species, for example, the Waterframework Directive monitoring.
Download article
More information: Jelger Herder
(j.herder@ravon.nl)
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Killer fungus invades Europa
A new study shows that the invasive salamander killing fungus (Batrachochytrium salamandrivorans: Bsal) occurs in more places, more countries and infects more species than previously known. It is urgent to halt the spread of the pathogenic fungus and to mitigate its effects. The fungus is a threat to the biodiversity of European salamanders and newts. An article with the results of this study appeared this week in Emerging Infectious Diseases.
Download Press Release
Download Article
More information: Annemarieke Spitzen
(a.spitzen@ravon.nl)
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New Red List for the freshwater fish of the Netherlands: a slight improvement
The Red List status of forty freshwater fish species that regularly reproduce in the Netherlands was re- assessed; for each species both trend and status were considered according to national criteria. The results show that Alosa falax is extinct, Lota lota critically endangered and Salmo trutta and Lampetra planeri endangered. Furthermore, ten species proved to be vulnerable, five susceptible and twenty-one not threatened. Rheophilic species that are dependent on hydromorphologically intact, running waters are relatively more threatened than generalist and limnophilic species. We reconstructed the previous Red List using our current methods. Comparing the data of the two lists, we showed that there are now six species that are less threatened and three species more threatened than in 1997. In general, habitat restoration and the improvement of water quality are having a beneficial effect on Dutch freshwater fish.
Download Red List
Download RAVON Report Red List for freshwater fish (in Dutch)
More information: Jan Kranenbarg
(j.kranenbarg@ravon.nl)
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