|Queen of Spain Fritillary/Storplettet Perlemorsommerfugl/ photo GB|
Butterflies and other insects are rapidly declining everywhere in Europe - and not least in Denmark. Scientists point, among other things, to pesticides, monoculture and lack of space as reasons.
A new investigation published in the prestigious journal Science shows that the insects of Europe disappear - this is even a talk about an ecological collapse. The German scientists have examined the insect occurrence in more than 100 nature reserves in western Europe - and the insects are extinct even in the nature reserves. The biomass of insects have fallen with more than 80 %.
The drastic decline for the insects of Europe could mean a decline in the number of birds, which has already been identified in Denmark, where since the 1970s four out of five partridges, three out of four lapwings and more than half the skylarks have disappeared. Huge areas - which earlier was nature- were ploughed without putting something else instead - and at the same time we experience the climate changes.
Sad but true -many Danish politicians apparently do not care, on the contrary there is a support for that Denmark - as one of few countries of EU - fights against a ban on pesticides, ( because the Danish agriculture demands it), which could represent a risc both to ourselves and the wild bees.
It is said that the approval of spraying in Denmark is tough, but in the approval is alone considered if a substance is representing a risc for the ground water or if it is exceeding limits in our food. It is not evaluated what happens upon the ground and it is not taken into account that herbicides like Roundup, which is the most used in Denmark, simply removes all plant growth where it hits - or that 2.500 tons various active substances are spread over 60 % of Denmarks area each year - or that the agriculture is allowed to use almost 1.000 various products.
This means that organisms in the earth, the wild plants of the fields and the insects upon the plants and the birds who live by the insects are being pushed more and more in the intensive Danish farm land. This happens in a degree where we are the witness of a slow collapse of ecological balances in the whole open countryside. This also applies to nature reserves.
Source: Excerpt of article by Ella Maria Bisschop-Larsen, Præsident for Danmarks Naturfredningsforening, Journal "Natur og Miljø", September 2017.
An ecological study in Western Germany.
The amount of insects collected by monitoring of traps in Orbroicher Bruch nature reserve in north west germany decreased by 78% in 24 years.
Each spring since 1989 insect traps have been set up in meadows and woodlands in Orbroicher Bruch nature reserve and 87 other nature areas in the West German state Nordrhein-Westfalen.
Recently the scientists presented alarming results: The average biomass of insects caught during summer was decreased from 1,6 kilo pr. trap in 1989 till only 300 gram pr. trap in 2014.
"The decline is dramatic and depressing and this applies to all kinds of insects, including butterflies, wild bees and hoverflies ", says Martin Sorg, who is entomologist from Krefeld Entomological Society, which is responsible for the monitoring project.
Several other studies from the western part of the world support the results from Germany.
The insects disappear everywhere.
Source/ Natur og Miljø, September 2017