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Live fast, die young
Date:4/18/2012

ientists point out that the promotion of self-pollinated species by the urban environment might result into cascading effects on pollinators: "If self-pollinating species are supported by urbanization and consequently increase their frequency in the regional species pool, fewer pollinators such as bees or butterflies will be supported" says Sonja Knapp. The scientists are also critical about invasive species that can be dispersed beyond yard boundaries. Still, cultivating more native plant species could have positive effects on the evolutionary diversity and potential of urban vegetation. "As yard plants spread into natural habitats, the ability of those ecosystems to respond to environmental change could be reduced", summarizes NATURE in its current "Research Highlights". "These results suggest that urbanites should consider gardening and harboring a higher number of native species," says Cavender-Bares.

In the 2008-study on the German flora, Sonja Knapp and colleagues analysed 14 million entries on plant occurrences in the FLORKART-database, which have been acquired by thousands of experts and volunteers. In the face of changing environmental conditions, nature conservation should not only focus on the protection of a high number of species, but also on evolutionary diversity. As urbanization will continue to shape our planet, nature conservation strategies for urban biodiversity should be developed, stated the scientists in their 2008-article in Ecology Letters.

The loss of evolutionary information will reduce species' chances to adapt to environmental changes and might, on the long term, negatively impact urban ecosystems. This assumption has now been confirmed with the Minnesotan field study.


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Contact: Tilo Arnhold
presse@ufz.de
49-341-235-1635
Helmholtz Association of German Research Centres
Source:Eurekalert  

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