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Corridor or drift fence? The role of medial moraines for fly dispersal over glacier

Ingimarsdottir, Maria LU ; Ripa, Jörgen LU and Hedlund, Katarina LU (2013) In Polar Biology 36(7). p.925-932
Abstract
Corridors are often considered to promote dispersal between habitat patches. In this paper, we study whether or not corridors induce colonisation of nunataks (ice-free areas in glacier surroundings) by promoting dispersal from lowland to the nunataks. On outlet glaciers, debris originating from nunataks forms the so-called medial moraines that stretch from the nunataks down-glacier to the lowland, forming corridors of debris on the glacier. Aerial dispersal was determined with yellow sticky traps on the moraines, bare glacier and glacier foreland. Dipterans were sampled in pitfall traps on the nunataks. Flying insects that were present on the vegetated glacier foreland belonged to five orders, that is, Diptera, Hemiptera, Hymenoptera,... (More)
Corridors are often considered to promote dispersal between habitat patches. In this paper, we study whether or not corridors induce colonisation of nunataks (ice-free areas in glacier surroundings) by promoting dispersal from lowland to the nunataks. On outlet glaciers, debris originating from nunataks forms the so-called medial moraines that stretch from the nunataks down-glacier to the lowland, forming corridors of debris on the glacier. Aerial dispersal was determined with yellow sticky traps on the moraines, bare glacier and glacier foreland. Dipterans were sampled in pitfall traps on the nunataks. Flying insects that were present on the vegetated glacier foreland belonged to five orders, that is, Diptera, Hemiptera, Hymenoptera, Lepidoptera and Trichoptera. On the glacier and medial moraines, however, mainly dipterans were present, with the majority of individuals found on the moraines. Hoverflies (Syrphidae) were abundant on the moraines and on the edges of nunataks close to the moraines, but were not present on the vegetated foreland. The origin of the hoverflies is thus not the nunataks and not the lowland. Rather, they are brought in by air currents towards the glacier, where they aggregate on a land type where they have a chance of survival, although it is not habitable. Thus, we conclude that the medial moraines do not function as regular corridors but as drift fences that direct the dispersal towards the adjacent land types, that is, the nunataks and the glacier foreland. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Subarctic, Long-distance dispersal, Colonisation, Iceland
in
Polar Biology
volume
36
issue
7
pages
925 - 932
publisher
Springer
external identifiers
  • wos:000321974900001
  • scopus:84878749526
ISSN
1432-2056
DOI
10.1007/s00300-013-1316-6
project
BECC
CAnMove
language
English
LU publication?
yes
id
52e8a4f9-24cd-4de6-b1bc-c9bdff4f166e (old id 4053419)
date added to LUP
2013-09-19 11:25:13
date last changed
2019-03-25 14:41:13
@article{52e8a4f9-24cd-4de6-b1bc-c9bdff4f166e,
  abstract     = {Corridors are often considered to promote dispersal between habitat patches. In this paper, we study whether or not corridors induce colonisation of nunataks (ice-free areas in glacier surroundings) by promoting dispersal from lowland to the nunataks. On outlet glaciers, debris originating from nunataks forms the so-called medial moraines that stretch from the nunataks down-glacier to the lowland, forming corridors of debris on the glacier. Aerial dispersal was determined with yellow sticky traps on the moraines, bare glacier and glacier foreland. Dipterans were sampled in pitfall traps on the nunataks. Flying insects that were present on the vegetated glacier foreland belonged to five orders, that is, Diptera, Hemiptera, Hymenoptera, Lepidoptera and Trichoptera. On the glacier and medial moraines, however, mainly dipterans were present, with the majority of individuals found on the moraines. Hoverflies (Syrphidae) were abundant on the moraines and on the edges of nunataks close to the moraines, but were not present on the vegetated foreland. The origin of the hoverflies is thus not the nunataks and not the lowland. Rather, they are brought in by air currents towards the glacier, where they aggregate on a land type where they have a chance of survival, although it is not habitable. Thus, we conclude that the medial moraines do not function as regular corridors but as drift fences that direct the dispersal towards the adjacent land types, that is, the nunataks and the glacier foreland.},
  author       = {Ingimarsdottir, Maria and Ripa, Jörgen and Hedlund, Katarina},
  issn         = {1432-2056},
  keyword      = {Subarctic,Long-distance dispersal,Colonisation,Iceland},
  language     = {eng},
  number       = {7},
  pages        = {925--932},
  publisher    = {Springer},
  series       = {Polar Biology},
  title        = {Corridor or drift fence? The role of medial moraines for fly dispersal over glacier},
  url          = {http://dx.doi.org/10.1007/s00300-013-1316-6},
  volume       = {36},
  year         = {2013},
}