Publication Date:
2024-01-12
Description:
Trends in dragonfly occurrence in Belgium (Odonata)
\nThe group \xe2\x80\x98Gomphus\xe2\x80\x99 collected 65 000 records of 69 species of Odonata, more or less equally scattered over Belgium. The best-investigated areas are the northern part and some river valleys in the south. Most hot spots can be found in the northeastern part, with a maximum of 48 species for 25 km\xc2\xb2. Remarkable is the fact that 50% of the species occurs in less than 7% of the 5 km grid cells (UTM). We determined trends in occurrence by comparing three periods: before 1950, 1950-1989 and 1990-2000. Four species show a clear decline over the three periods, eight species give evidence of a historical decline but survive on a limited number of sites and eight species also display a historical decline but have been increasing during the last decade. Six species show a (very) clear increase over the three periods and two species display their increase only during the last ten years.
Keywords:
Odonata
;
Dragonflies
;
Belgium
;
Atlas
;
Hot spot
;
Abundance class shift
;
Habitat
Repository Name:
National Museum of Natural History, Netherlands
Type:
info:eu-repo/semantics/article
Format:
application/pdf
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