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Ring-based versus disc-based separation of spatial scales: a case study on the impact of arable land proportions on invertebrates in freshwater streams

Schneider, Christine; Ekschmitt, Klemens; Wolters, Volkmar and Birkhofer, Klaus LU (2011) In Aquatic Ecology 45(3). p.351-356
Abstract
The impact of different land-use types on

species is traditionally estimated by correlating

landscape proportions recorded in buffer areas around

focal points with species data observed at these sites.

If a high proportion of a specific land-use type exists

within a small radius, it will be accumulated in larger

buffers and may confound the interpretation at larger

scales. We sampled freshwater invertebrates in ten

streams using cages with artificial substrate and

compared the effects of arable land proportions

calculated in disc-shaped buffers of increasing radius

versus areas calculated from non-overlapping rings of

increasing... (More)
The impact of different land-use types on

species is traditionally estimated by correlating

landscape proportions recorded in buffer areas around

focal points with species data observed at these sites.

If a high proportion of a specific land-use type exists

within a small radius, it will be accumulated in larger

buffers and may confound the interpretation at larger

scales. We sampled freshwater invertebrates in ten

streams using cages with artificial substrate and

compared the effects of arable land proportions

calculated in disc-shaped buffers of increasing radius

versus areas calculated from non-overlapping rings of

increasing radius. We hypothesize that (1) the

accumulative disc-based approach leads to confounding

effects across increasing buffer size and that (2)

the use of ring-based methods facilitates the identification

of relevant scales for conservation measures.

The abundance of crustaceans showed a positive

relationship with arable land proportions, but Plecoptera

abundance and the taxonomic richness of

Ephemeroptera and Plecoptera decreased with

increasing arable land proportions in the surrounding

landscape. Our results further support the presence of

confounding effects in disc-based analyses, as correlations

between arable land proportions and Crustacea,

or Plecoptera, respectively, were affected by the

accumulation of small-scale area proportions. The

distance at which arable land proportions significantly

affected benthic fauna in freshwater streams

was consistently shorter if calculated from rings

rather than from discs. Although an a priori definition

of ring width introduces new challenges, a combined

use of disc- and ring-based techniques for the

estimation of land-use effects may substantially

improve the realization of conservation and protection

measures in terrestrial and aquatic systems. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arthropod diversity, Crustacea, EPT taxa, Landscape analysis, Land-use type, Multi-scale analysis, Spatial analysis, Spatial memory
in
Aquatic Ecology
volume
45
issue
3
pages
351 - 356
publisher
Springer
external identifiers
  • scopus:79960734154
ISSN
1386-2588
DOI
10.1007/s10452-011-9358-8
language
English
LU publication?
yes
id
46680791-4378-4cc9-a46c-a7c512563643 (old id 2440397)
alternative location
http://www.scopus.com/inward/record.url?eid=2-s2.0-79960734154&partnerID=40&md5=6ac789daca45cbf91ddbecda8ea279ae
date added to LUP
2012-06-18 14:08:41
date last changed
2017-01-01 03:21:22
@article{46680791-4378-4cc9-a46c-a7c512563643,
  abstract     = {The impact of different land-use types on<br/><br>
species is traditionally estimated by correlating<br/><br>
landscape proportions recorded in buffer areas around<br/><br>
focal points with species data observed at these sites.<br/><br>
If a high proportion of a specific land-use type exists<br/><br>
within a small radius, it will be accumulated in larger<br/><br>
buffers and may confound the interpretation at larger<br/><br>
scales. We sampled freshwater invertebrates in ten<br/><br>
streams using cages with artificial substrate and<br/><br>
compared the effects of arable land proportions<br/><br>
calculated in disc-shaped buffers of increasing radius<br/><br>
versus areas calculated from non-overlapping rings of<br/><br>
increasing radius. We hypothesize that (1) the<br/><br>
accumulative disc-based approach leads to confounding<br/><br>
effects across increasing buffer size and that (2)<br/><br>
the use of ring-based methods facilitates the identification<br/><br>
of relevant scales for conservation measures.<br/><br>
The abundance of crustaceans showed a positive<br/><br>
relationship with arable land proportions, but Plecoptera<br/><br>
abundance and the taxonomic richness of<br/><br>
Ephemeroptera and Plecoptera decreased with<br/><br>
increasing arable land proportions in the surrounding<br/><br>
landscape. Our results further support the presence of<br/><br>
confounding effects in disc-based analyses, as correlations<br/><br>
between arable land proportions and Crustacea,<br/><br>
or Plecoptera, respectively, were affected by the<br/><br>
accumulation of small-scale area proportions. The<br/><br>
distance at which arable land proportions significantly<br/><br>
affected benthic fauna in freshwater streams<br/><br>
was consistently shorter if calculated from rings<br/><br>
rather than from discs. Although an a priori definition<br/><br>
of ring width introduces new challenges, a combined<br/><br>
use of disc- and ring-based techniques for the<br/><br>
estimation of land-use effects may substantially<br/><br>
improve the realization of conservation and protection<br/><br>
measures in terrestrial and aquatic systems.},
  author       = {Schneider, Christine and Ekschmitt, Klemens and Wolters, Volkmar and Birkhofer, Klaus},
  issn         = {1386-2588},
  keyword      = {Arthropod diversity,Crustacea,EPT taxa,Landscape analysis,Land-use type,Multi-scale analysis,Spatial analysis,Spatial memory},
  language     = {eng},
  number       = {3},
  pages        = {351--356},
  publisher    = {Springer},
  series       = {Aquatic Ecology},
  title        = {Ring-based versus disc-based separation of spatial scales: a case study on the impact of arable land proportions on invertebrates in freshwater streams},
  url          = {http://dx.doi.org/10.1007/s10452-011-9358-8},
  volume       = {45},
  year         = {2011},
}