AVJNF: Vilsted Sø, Odonata survey
Citation
Kjeldsen J P, Malmborg L (2022). AVJNF: Vilsted Sø, Odonata survey. Version 1.3. Aage V. Jensen Nature Foundation. Occurrence dataset https://doi.org/10.15468/uf4sxc accessed via GBIF.org on 2024-09-01.Description
The lake Vilsted Sø was restored in 1998 after 100 years of being agricultural land. It is one of the largest lakes (450 ha) in North Jutland. Aage V. Jensen Nature Foundation acquired the lake and the surrounding 400 ha of wetlands, meadows and swamp forests in 2005. The area is managed on daily basis by the Danish Nature Agency. Folder (in Danish) with a map of the area: https://naturstyrelsen.dk/media/258476/nst_vilsted_1905_web.pdf Description of the area (in Danish): https://naturstyrelsen.dk/naturoplevelser/naturguider/vilsted-soe/ The Foundation’s goal is to preserve and improve the nature values and biodiversity in the area, as well as to give people opportunities to explore the area by canoeing/kayaking on the lake, hiking and cycling on the paths established around the lake, watching birds from the central tower and visiting the Nature Centre. Only a few nature surveys have been made in the area so far. The survey of dragonflies and damselflies conducted by biologist Jørgen Peter Kjeldsen, Ornit.dk in 2021 is one of those.Sampling Description
Study Extent
The lake Vilsted Sø, North Jutland, Denmark and its vicinities.Sampling
Dragonfly and damselfly fauna of the lake Vilsted Sø in North Jutland, Denmark was surveyed in five monitoring rounds from May to September 2021. In each round, the investigation took three field days, during which six to eight fixed routes (transects) were thoroughly surveyed (from kayak or in waders). The survey was carried out at the time of day when the activity of the insects is highest, between 10 am and 5 pm (daylight saving time), on days when the following weather conditions were met: - The weather is dry (no precipitation). - The wind speed is max. 4 Beaufort = 8 m / sec. - The temperature is min. 17o C in case of cloudy weather (> 50% cloud cover). - The temperature is min. 13o C in case of sunny weather (<50% cloud cover). The method of registration was: 1) Species identification of all individuals of dragonflies and damselflies seen (within a distance of up to 25 meters from the transect line) using binoculars with low close focus distance (1 meter). 2) Counting the number of individuals. When the density of animals is high (especially the case with certain species of damselflies), a qualified estimate of the order of magnitude is made. 3) Continuous data entry in a mobile phone app. Each entry contains the following data: coordinates, date, species, sex, behavior (where relevant) and number of individuals. In addition, dragonflies and damselflies were registered outside the fixed routes, in order to make the distribution maps of individual species more complete.Quality Control
N/AMethod steps
- N/A
Taxonomic Coverages
-
Odonatacommon name: Dragonflies & Damselflies rank: order
Geographic Coverages
Denmark, North Jutland, Vilsted lake near Ranum and Vilsted
Bibliographic Citations
Contacts
Jørgen Peter Kjeldsenoriginator
position: Biologist
Ornit.dk
Højstrupvej 9
Frøstrup
7741
DK
email: jpk@ornit.dk
homepage: https://ornit.dk/
Lars Malmborg
originator
position: Biologist
Aage V. Jensen Nature Foundation
DK
Telephone: +4521663667
email: lm@avjf.dk
homepage: https://www.avjf.dk
Lars Malmborg
metadata author
position: Biologist
Aage V. Jensen Nature Foundation
DK
Telephone: +4521663667
email: lm@avjf.dk
homepage: https://www.avjf.dk
Jørgen Peter Kjeldsen
metadata author
position: Biologist
Ornit.dk
Højstrupvej 9
Frøstrup
7741
DK
email: jpk@ornit.dk
homepage: https://ornit.dk/
Isabel Calabuig
distributor
position: Node Manager, Data Curator
DanBIF, Natural History Museum of Denmark
DK
email: icalabuig@snm.ku.dk
homepage: http://snm.ku.dk/english/staffsnm/staff/?pure=en/persons/88409
userId: http://orcid.org/0000-0001-5515-7900
Irina Goldberg
processor
position: Biologist
DK
email: irina.goldberg@gmail.com
Lars Malmborg
administrative point of contact
position: Biologist
Aage V. Jensen Nature Foundation
DK
Telephone: +4521663667
email: lm@avjf.dk
homepage: https://www.avjf.dk