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Persistence of spatial variance and spatial pattern in the abundance of a submerged plant

Klaassen, Raymond LU and Nolet, Bart A. (2008) In Ecology 89(11). p.2973-2979
Abstract
Organisms usually benefit from heterogeneous conditions, but, by doing so, may reduce the degree of heterogeneity. The question therefore arises how heterogeneity is maintained. We investigated within-year spatiotemporal patterns in a monospecific stand of a submerged plant (fennel pondweed, Potamogeton pectinatus), with the novelty that we distinguished between different forms of heterogeneity: spatial variance (the frequency distribution of densities) and spatial pattern (the spatial distribution of densities). We repeatedly measured plant biomass that was affected by swan predation, winter mortality, and summer regrowth. Spatial variance was enhanced mostly by swan foraging, despite the fact that swans appear to exploit patches to the... (More)
Organisms usually benefit from heterogeneous conditions, but, by doing so, may reduce the degree of heterogeneity. The question therefore arises how heterogeneity is maintained. We investigated within-year spatiotemporal patterns in a monospecific stand of a submerged plant (fennel pondweed, Potamogeton pectinatus), with the novelty that we distinguished between different forms of heterogeneity: spatial variance (the frequency distribution of densities) and spatial pattern (the spatial distribution of densities). We repeatedly measured plant biomass that was affected by swan predation, winter mortality, and summer regrowth. Spatial variance was enhanced mostly by swan foraging, despite the fact that swans appear to exploit patches to the same threshold level. Spatial pattern, which had vanished after swan foraging, reestablished due to spatial pattern in winter mortality and was further enhanced by plant regrowth. We found that variance and pattern each have their own temporal dynamics and are maintained by different biological processes. We therefore advocate that it is pivotal to distinguish between variance and pattern in the study of spatial heterogeneity. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
interactions, plant-animal, optimal foraging behavior, macrophyte, heterogeneity, herbivory, Cygnus columbianus bewickii, density dependence, vegetation patterns, Potamogeton pectinatus, spatial scale
in
Ecology
volume
89
issue
11
pages
2973 - 2979
publisher
Ecological Society of America
external identifiers
  • wos:000261053500001
  • scopus:63849104227
ISSN
0012-9658
DOI
10.1890/07-974.1
language
English
LU publication?
yes
id
d68d4361-286d-4d87-9669-10bd4605eb02 (old id 1307969)
date added to LUP
2009-03-19 12:55:18
date last changed
2017-04-02 03:51:55
@article{d68d4361-286d-4d87-9669-10bd4605eb02,
  abstract     = {Organisms usually benefit from heterogeneous conditions, but, by doing so, may reduce the degree of heterogeneity. The question therefore arises how heterogeneity is maintained. We investigated within-year spatiotemporal patterns in a monospecific stand of a submerged plant (fennel pondweed, Potamogeton pectinatus), with the novelty that we distinguished between different forms of heterogeneity: spatial variance (the frequency distribution of densities) and spatial pattern (the spatial distribution of densities). We repeatedly measured plant biomass that was affected by swan predation, winter mortality, and summer regrowth. Spatial variance was enhanced mostly by swan foraging, despite the fact that swans appear to exploit patches to the same threshold level. Spatial pattern, which had vanished after swan foraging, reestablished due to spatial pattern in winter mortality and was further enhanced by plant regrowth. We found that variance and pattern each have their own temporal dynamics and are maintained by different biological processes. We therefore advocate that it is pivotal to distinguish between variance and pattern in the study of spatial heterogeneity.},
  author       = {Klaassen, Raymond and Nolet, Bart A.},
  issn         = {0012-9658},
  keyword      = {interactions,plant-animal,optimal foraging behavior,macrophyte,heterogeneity,herbivory,Cygnus columbianus bewickii,density dependence,vegetation patterns,Potamogeton pectinatus,spatial scale},
  language     = {eng},
  number       = {11},
  pages        = {2973--2979},
  publisher    = {Ecological Society of America},
  series       = {Ecology},
  title        = {Persistence of spatial variance and spatial pattern in the abundance of a submerged plant},
  url          = {http://dx.doi.org/10.1890/07-974.1},
  volume       = {89},
  year         = {2008},
}