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19/03/2019 - Fluttering Toward Extinction: Butterfly Numbers Down By Two-Thirds

Müncheberg, 03/19/2019. Together with a German/Polish team, Senckenberg scientist Thomas Schmitt studied the effects of various land use models on the butterfly fauna. The researchers show that meadows adjacent to high-intensity agricultural areas are home to less than half the number of butterfly species than areas in nature preserves. The number of individuals is even down to one-third of that number. In their study, which was recently published in the scientific journal “Insect Conservation and Diversity,” the scientists emphasize the need for a more environmentally friendly agriculture.

Germany is home to roughly 33,500 species of insects – but their numbers are decreasing dramatically. Of the 189 species of butterflies currently known from Germany, 99 species are on the Red List, 5 have already become extinct, and 12 additional species are threatened with extinction. “We assume that this negative trend is primarily due to the industrialization of agriculture,” explains Prof. Dr. Thomas Schmitt, the director of the Senckenberg German Entomological Institute in Müncheberg, Brandenburg, and he continues, “In our new study, we examined the specific effects of the intensity of agricultural use on the butterfly fauna.”

To this end, the research team around Schmitt recorded the occurrence of butterfly species in 21 meadow sites east of Munich. Of these study sites, 17 are surrounded by agriculturally used areas, and 4 are in nature preserves with near-natural cultivation. “Our results show an obvious trend: in the vicinity of intensively cultivated fields that are regularly sprayed with pesticides, the diversity and numbers of butterflies are significantly lower than in meadows near less used or unused areas,” explains the study’s lead author, Prof. Dr. Jan Christian Habel of the Technical University in Munich.

The entomologists recorded a total of 24 butterfly species and 864 individuals in all study sites. “In the meadows that are surrounded by agriculturally used areas we encountered an average of 2.7 butterfly species per visit; in the four study sites within the nature preserves ‘Dietersheimer Brenne’ and ‘Garchinger Heide’ we found an average of 6.6 species,” adds Prof. Dr. Werner Ulrich of the Copernicus University in Thorn, Poland. Specialists among the butterflies were particularly dependent on near-natural habitats, while the more adaptable “generalists” were also found in other grassland sites.

 “Our study emphasizes the negative impact of the conventional, industrialized agriculture on the butterfly diversity and shows the urgent need for ecologically sustainable cultivation methods. Additional field studies may aid in identifying individual factors responsible for the insect die-back and in implementing appropriate countermeasures,” adds Schmitt in closing.


Publication

Habel, J. C., Ulrich, W. , Biburger, N. , Seibold, S. and Schmitt, T. (2019), Agricultural intensification drives butterfly decline. Insect Conserv Divers. doi:10.1111/icad.12343



Contact

Prof. Dr. Thomas Schmitt
Senckenberg German Entomological Institute Müncheberg (SDEI)
Phone 033432 - 73 698 3700
thomas.schmitt@senckenberg.de

Judith Jördens
Press Office
Senckenberg Gesellschaft für Naturforschung
Phone 069- 7542 1434
pressestelle@senckenberg.de


1
The Pearly Heath (Coenonympha arcania) requires a richly structured cultural landscape with hedgerows and other structural elements. Therefore, it is among the declining butterfly species.

2
Weaver’s Fritillary (Boloria dia), also known as the Violet Fritillary, is restricted to near-natural dry grasslands; it is therefore threatened by agricultural intensification. Photo: Senckenberg/Schmitt


Press images may be used at no cost for editorial reporting, provided that the original author’s name is published, as well. The images may only be passed on to third parties in the context of current reporting.

To study and understand nature with its unlimited diversity of living creatures and to preserve and manage it in a sustainable fashion as the basis of life for future generations – that has been the goal of the Senckenberg Gesellschaft für Naturforschung (Senckenberg Nature Research Society) for the past 200 years. This integrative “geobiodiversity research” and the dissemination of research and science are among Senckenberg’s primary tasks. Three nature museums in Frankfurt, Görlitz and Dresden display the diversity of life and the earth’s development over millions of years. The Senckenberg Gesellschaft für Naturforschung is a member of the Leibniz Association. The Senckenberg Nature Museum in Frankfurt is supported by the City of Frankfurt am Main as well as numerous other partners. Additional information can be found at www.senckenberg.de.


Press contact

Dr. Sören Dürr
Tel.: 069 7542-1580

Judith Jördens
Tel.: 069 7542-1434
Mobil: 0172-5842340

Anna Lena Schnettler
Tel.: 069 7542-1561

Dr. Alexandra Donecker
Tel.: 069 7542 1209

Email:

Senckenberg
Forschungsinstitut und Naturmuseum
Senckenberganlage 25
60325 Frankfurt

 

26/06/2019 11:22:35


26/06/2019 11:22:20


26/06/2019 11:21:39


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