Advanced

Contrasting effects of habitat area and connectivity on evenness of pollinator communities

Marini, Lorenzo; Ockinger, Erik; Bergman, Karl-Olof; Jauker, Birgit; Krauss, Jochen; Kuussaari, Mikko; Poyry, Juha; Smith, Henrik LU ; Steffan-Dewenter, Ingolf and Bommarco, Riccardo (2014) In Ecography 37(6). p.544-551
Abstract
Losses of both habitat area and connectivity have been identified as important drivers of species richness declines, but little theoretical and empirical work exists that addresses the effect of fragmentation on relative commonness of highly mobile species such as pollinating insects. With a large dataset of wild bee and butterfly abundances collected across Europe, we first tested the effect of habitat area and connectivity on evenness in pollinator communities using a large array of indexes that give different weight to dominance and rarity. Second, we tested if traits related to mobility and diet breadth could explain the observed evenness patterns. We found a clear negative effect of area and a weaker, but positive effect of... (More)
Losses of both habitat area and connectivity have been identified as important drivers of species richness declines, but little theoretical and empirical work exists that addresses the effect of fragmentation on relative commonness of highly mobile species such as pollinating insects. With a large dataset of wild bee and butterfly abundances collected across Europe, we first tested the effect of habitat area and connectivity on evenness in pollinator communities using a large array of indexes that give different weight to dominance and rarity. Second, we tested if traits related to mobility and diet breadth could explain the observed evenness patterns. We found a clear negative effect of area and a weaker, but positive effect of connectivity on evenness. Communities in small habitat fragments were mainly composed of mobile and generalist species. The higher evenness in small fragments could thereby be generated by highly mobile species that maintain local populations with frequent inter-fragment movements. Trait analysis suggested an increasing importance of dispersal over local recruitment, as we move from large to small fragments and from less to more connected fragments. Species richness and evenness were negatively correlated indicating that the two variables responded differently to habitat area and connectivity, although the mechanisms underlying the observed patterns are difficult to isolate. Even though habitat area and connectivity often decrease simultaneously due to habitat fragmentation, an interesting practical implication of the contrasting effect of the two variables is that the resulting community composition will depend on the relative strength of these two processes. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ecography
volume
37
issue
6
pages
544 - 551
publisher
Wiley-Blackwell
external identifiers
  • wos:000337694100004
  • scopus:84901696298
ISSN
1600-0587
DOI
10.1111/j.1600-0587.2013.00369.x
project
BECC
language
English
LU publication?
yes
id
9e5792b8-36ba-4636-a22c-2bbea0434462 (old id 4609652)
date added to LUP
2014-08-22 15:28:59
date last changed
2017-09-17 05:40:00
@article{9e5792b8-36ba-4636-a22c-2bbea0434462,
  abstract     = {Losses of both habitat area and connectivity have been identified as important drivers of species richness declines, but little theoretical and empirical work exists that addresses the effect of fragmentation on relative commonness of highly mobile species such as pollinating insects. With a large dataset of wild bee and butterfly abundances collected across Europe, we first tested the effect of habitat area and connectivity on evenness in pollinator communities using a large array of indexes that give different weight to dominance and rarity. Second, we tested if traits related to mobility and diet breadth could explain the observed evenness patterns. We found a clear negative effect of area and a weaker, but positive effect of connectivity on evenness. Communities in small habitat fragments were mainly composed of mobile and generalist species. The higher evenness in small fragments could thereby be generated by highly mobile species that maintain local populations with frequent inter-fragment movements. Trait analysis suggested an increasing importance of dispersal over local recruitment, as we move from large to small fragments and from less to more connected fragments. Species richness and evenness were negatively correlated indicating that the two variables responded differently to habitat area and connectivity, although the mechanisms underlying the observed patterns are difficult to isolate. Even though habitat area and connectivity often decrease simultaneously due to habitat fragmentation, an interesting practical implication of the contrasting effect of the two variables is that the resulting community composition will depend on the relative strength of these two processes.},
  author       = {Marini, Lorenzo and Ockinger, Erik and Bergman, Karl-Olof and Jauker, Birgit and Krauss, Jochen and Kuussaari, Mikko and Poyry, Juha and Smith, Henrik and Steffan-Dewenter, Ingolf and Bommarco, Riccardo},
  issn         = {1600-0587},
  language     = {eng},
  number       = {6},
  pages        = {544--551},
  publisher    = {Wiley-Blackwell},
  series       = {Ecography},
  title        = {Contrasting effects of habitat area and connectivity on evenness of pollinator communities},
  url          = {http://dx.doi.org/10.1111/j.1600-0587.2013.00369.x},
  volume       = {37},
  year         = {2014},
}