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Dark diversity in dry calcareous grasslands is determined by dispersal ability and stress-tolerance

Riibak, Kersti; Reitalu, Triin; Tamme, Riin; Helm, Aveliina; Gerhold, Pille; Znamenskiy, Sergey; Bengtsson, Karin; Rosen, Ejvind; Prentice, Honor C LU and Paertel, Meelis (2015) In Ecography 38(7). p.713-721
Abstract
Temperate calcareous grasslands are characterized by high levels of species richness at small spatial scales. Nevertheless, many species from a habitat-specific regional species pool may be absent from local communities and represent the dark diversity' of these sites. Here we investigate dry calcareous grasslands in northern Europe to determine what proportion of the habitat-specific species pool is realized at small scales (i.e. how the community completeness varies) and which mechanisms may be contributing to the relative sizes of the observed and dark diversity. We test whether the absence of particular species in potentially suitable grassland sites is a consequence of dispersal limitation and/or a low ability to tolerate stress (e.g.... (More)
Temperate calcareous grasslands are characterized by high levels of species richness at small spatial scales. Nevertheless, many species from a habitat-specific regional species pool may be absent from local communities and represent the dark diversity' of these sites. Here we investigate dry calcareous grasslands in northern Europe to determine what proportion of the habitat-specific species pool is realized at small scales (i.e. how the community completeness varies) and which mechanisms may be contributing to the relative sizes of the observed and dark diversity. We test whether the absence of particular species in potentially suitable grassland sites is a consequence of dispersal limitation and/or a low ability to tolerate stress (e.g. drought and grazing). We analysed a total of 1223 vegetation plots (1 x 1 m) from dry calcareous grasslands in Sweden, Estonia and western Russia. The species co-occurrence approach was used to estimate the dark diversity for each plot. We calculated the maximum dispersal distance for each of the 291 species in our dataset by using simple plant traits (dispersal syndrome, growth form and seed characteristics). Large seed size was used as proxy for small seed number; tall plant height and low S-strategy type scores were used to characterise low stress-tolerance. Levels of small-scale community completeness were relatively low (more species were absent than present) and varied between the grasslands in different geographic areas. Species in the dark diversity were generally characterized by shorter dispersal distances and greater seed weight (fewer seeds) than species in the observed diversity. Species within the dark diversity were generally taller and had a lower tolerance of stressful conditions. We conclude that, even if temperate grasslands have high levels of small-scale plant diversity, the majority of potentially suitable species in the regional species pool may be absent as a result of dispersal limitation and low stress-tolerance. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecography
volume
38
issue
7
pages
713 - 721
publisher
Wiley-Blackwell
external identifiers
  • wos:000357135900007
  • scopus:84933674372
ISSN
1600-0587
DOI
10.1111/ecog.01312
language
English
LU publication?
yes
id
50162878-e247-46f4-8c61-0d1d4766c2db (old id 7790800)
date added to LUP
2015-09-03 12:38:53
date last changed
2017-09-03 04:24:00
@article{50162878-e247-46f4-8c61-0d1d4766c2db,
  abstract     = {Temperate calcareous grasslands are characterized by high levels of species richness at small spatial scales. Nevertheless, many species from a habitat-specific regional species pool may be absent from local communities and represent the dark diversity' of these sites. Here we investigate dry calcareous grasslands in northern Europe to determine what proportion of the habitat-specific species pool is realized at small scales (i.e. how the community completeness varies) and which mechanisms may be contributing to the relative sizes of the observed and dark diversity. We test whether the absence of particular species in potentially suitable grassland sites is a consequence of dispersal limitation and/or a low ability to tolerate stress (e.g. drought and grazing). We analysed a total of 1223 vegetation plots (1 x 1 m) from dry calcareous grasslands in Sweden, Estonia and western Russia. The species co-occurrence approach was used to estimate the dark diversity for each plot. We calculated the maximum dispersal distance for each of the 291 species in our dataset by using simple plant traits (dispersal syndrome, growth form and seed characteristics). Large seed size was used as proxy for small seed number; tall plant height and low S-strategy type scores were used to characterise low stress-tolerance. Levels of small-scale community completeness were relatively low (more species were absent than present) and varied between the grasslands in different geographic areas. Species in the dark diversity were generally characterized by shorter dispersal distances and greater seed weight (fewer seeds) than species in the observed diversity. Species within the dark diversity were generally taller and had a lower tolerance of stressful conditions. We conclude that, even if temperate grasslands have high levels of small-scale plant diversity, the majority of potentially suitable species in the regional species pool may be absent as a result of dispersal limitation and low stress-tolerance.},
  author       = {Riibak, Kersti and Reitalu, Triin and Tamme, Riin and Helm, Aveliina and Gerhold, Pille and Znamenskiy, Sergey and Bengtsson, Karin and Rosen, Ejvind and Prentice, Honor C and Paertel, Meelis},
  issn         = {1600-0587},
  language     = {eng},
  number       = {7},
  pages        = {713--721},
  publisher    = {Wiley-Blackwell},
  series       = {Ecography},
  title        = {Dark diversity in dry calcareous grasslands is determined by dispersal ability and stress-tolerance},
  url          = {http://dx.doi.org/10.1111/ecog.01312},
  volume       = {38},
  year         = {2015},
}