New species for Sweden in our sampling!

The first results from last years sampling of invertebrates have now been delivered by the experts that have spent the winter sorting, counting and identifying the specimens. One group that has been done so far is the family of dancing flies (Empididae). Among the specimens was a species never encountered in Sweden before! It is the fly Hilara manicata. Apart from this new species for Sweden, also 3 new species for the County (Halland) were found. Several organsim groups remin to be counted and identified, e.g. spiders and beetles and it will be interesting to see if we get more surprises.

Sorting of samples

Now the sorting of the samples is on the way. Victor Eriksson is hired to sort out the groups of interest, that will later be sent out to experts for species determination.


The collection of arthropods is done for 2020! The season has been very rewarding, with more than 550 samples collected between the 75 total wetlands in Halland and Uppland.


When doing sampling close to livestock, you always have to anticipate setbacks. The cattle at this location close to Båstad on the border between Halland and Skåne, showed a particular interest in trampling the Malaise trap, twice!

Last collection this year

The last collection of the year in Halland is now on the way with Malaise trapping and suction sampling. Just east of Halmstad, close to Årnarp we found this Wasp spider (Argiope bruennichi) which is a rather recent immigrant to Sweden.

Collection spiders

In Uppland we are also collecting spiders for gut content analyses. The process is similar to that of the suction sampling, only we are using an InsectaZooka and exchangeable collection socks to minimize the cross-contamination risks, as well as cleaning the equipment with bleach. This concludes the sampling period in Uppland for 2020 in late-August.

Third collection

The third and last leg of collection is on the way, with Malaise-, and pitfall trapping, as well as with suction sampling in both Uppland and Halland. Seen here is the pitfall trap that measures 7cm in diameter and 6.5cm deep, and is filled with soapy water; mounted at Senneby wetland, close to the Baltic coast north of Stockholm.

Second collection

The second collection, with more Malaise-trapping in both Uppland and Halland is now in action. After the hot-streak during the midsummer week, we hope to find plenty of insects around the wetlands. This picture is taken at Hemmesta sjöäng, a reconstructed wetland east of Stockholm.

Inverted leaf blower

Collecting ground living arthropods using an inverted leaf blower is an effective way to gauge the density of their communities. The spiders and insects that get sucked up is transferred to a white tub, from which it is easy to pooter-out the individuals of focus.

Arthropod collection

The start of the years arthropod collection! The collection methods we use are suction sampling, pitfall trapping, and Malaise trapping. The tent-like trap is a Malaise trap, invented in the 1930’s by René Malaise, and optimized for catching flying insects. The collections will be done at 25 wetland locations in Uppland, and 50 in Halland (see distribution in Project Area section). This trap is placed at a constructed wetland at the Bergianska garden, just west of Stockholm University.

BioWetland is launched

Welcome to BioWetland!

Wetlandscapes & Biodiversity – Buffer, Biodiversity and Bees

Research on how constructed wetlands(CWs) function hydrologically in a river basin perspective and how hydrology and its interactions with wetland design, location and management affect the biodiversity in wetlands and at the landscape level, with focus on arthropods in terrestrial-aquatic boundaries and pollinators.