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Small local population sizes and high habitat patch fidelity in a specialised solitary bee.

Författare:
  • Markus Franzén
  • Magnus Larsson
  • Sven Nilsson
Publiceringsår: 2009
Språk: Engelska
Sidor: 89-95
Publikation/Tidskrift/Serie: Journal of Insect Conservation
Volym: 13
Nummer: 1
Dokumenttyp: Artikel i tidskrift
Förlag: Springer

Abstract english

Andrena hattorfiana is a rare solitary bee which has declined during the last decades throughout western Europe. It is specialised to forage pollen from plants of the family Dipsacaceae. Knowledge of distribution, dispersal

propensity, and local population sizes is essential for successful conservation of A. hattorfiana. The investigated local bee populations (n = 78) were dominated by small local populations and 60% were smaller than 10 female individuals and 80% were smaller than 50 female individuals. The area of the median occupied habitat patch was 1.25 hectare and harboured 7 female bees. Mark-releaserecapture studies of female A. hattorfiana revealed a sedentary behaviour. Among pollen-foraging female bees the

average registered distance moved was 46 m. The patch emigration rate was about 2%, with an observed maximum colonization distance of 900 m. Only 10% of the individuals crossed areas without the pollen plant within grassland

patches, such as unpaved roads, stone walls and small treestands, even if these areas were less than 10 m wide. This study shows that solitary bees can occur in local populations of extremely small size and they have a sedentary behaviour. These are features that usually increase the risk

of local population extinction.

Keywords

  • Ecology
  • Andrena hattorfiana
  • Knautia arvensis
  • Apoidea
  • Oligolecty
  • Wild-bee
  • Sedentary
  • Metapopulation
  • Dispersal
  • Mark-recapture

Other

Published
  • ISSN: 1366-638X
Sven G. Nilsson
E-post: sven [dot] nilsson [at] biol [dot] lu [dot] se

Professor emeritus

Biodiversitet

E-A352

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