In ten years, half of all butter types have disappeared from Malmö parks, and the number of species in other green areas has not changed. A new study points to the problem of preserving the untouched green areas where butterflies are concentrated intensively.
It needs untouched grass to protect smaller miter larvae. Stock Photography.
From 2006 to 2015, Lund University, in collaboration with SLU, invented butterflies in Malmö parks and green spaces. In traditional parks, half of all butterfly species disappeared during this period. In the less well-kept regions, the species also disappeared, but were replaced by new ones, so the kingdom was the same over time.
– There are many aspects of biodiversity in cities. Partly biodiversity itself and the pollination services of insects, "says Anna Persson, researcher at Lund University Center for Environmental and Climate Research.
"There is also a value in the life of biodiversity. Usually we have the opportunity to experience nature in our daily life in cities and there are studies showing that we are as urbanized as we have lost our understanding of nature.
They feel better in the so-called ruderatmark environments with butterflies, meadows and untouched areas where hostels are located. Adult butterflies can drink nectar and the larva can eat other parts of the plant. The larvae are selective and can survive only a few plant species.
Therefore, the study emphasizes the importance of protecting untouched green areas when urbanization intensifies. This benefits not only butterflies, but also other pollinated insects.
”Very well-managed, hard parks that just lost most of their species. It shows that it's a great value to think about how to look at a green area and perhaps dare to have more native plants and meadows, ün says Anna Persson.
Butterflies and host plants
There are approximately 150000 different butterfly species in the host. There are more than 2800 species in Sweden.
Adult butterflies can drink nectar from several different plants. However, they lay eggs in certain plants, which the larvae are trying to eat, which they call so-called host plants. Butterflies evolved with host growth and adapted what they could eat and feed after their digestion and the substance they were staying with.
For example, lemon butter larvae are braked and getapel-dependent. The larvae of Kamgrassfjäril, lawnmower and small moth larvae live in many common grass species and are therefore due to the fact that the grass is not cut.
Source: Lund University