donderdag 29 november 2012

Invasive species in NL


When rereading an old post on 'novel ecosystems' I wondered in what way statistics could illustrate the point of rapidly changing environments. The above graph shows the number of invasive vertebra, molluscs and lobsters. That the trend is toward acceleration is impossible to miss. I am looking for similar data on plants. There are an approximate 27.000 animal species in NL (2010 Data, graph on the right). The use of this is limited as presence of a specie and the frequency of a specie are two entirely different things.
   
The rising presence of invasive species happens against a decline in biodiversity



The 2005 'Audit of non-native species in England' has the following table on introduction dates for invasive species. It does not seem to show the same pattern from the Dutch data.

 

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