| Registro completo |
| Provedor de dados: |
Naturalis
|
| País: |
Netherlands
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| Título: |
Trends in dragonfly occurrence in Belgium (Odonata)
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| Autores: |
Knijf, G. de
Anselin, A.
Goffart, P.
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| Data: |
2003
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| Ano: |
2003
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| Palavras-chave: |
Odonata
Dragonflies
Belgium
Atlas
Hot spot
Abundance class shift
Habitat
42.75
|
| Resumo: |
Trends in dragonfly occurrence in Belgium (Odonata) The group ‘Gomphus’ 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 km². 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.
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| Tipo: |
Article in monograph or in proceedings
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| Identificador: |
http://www.repository.naturalis.nl/record/219852
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| Editor: |
European Invertebrate Survey - the Netherlands
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| Formato: |
application/pdf
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| Direitos: |
(c) Naturalis
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