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Ramet demography in a ring-forming clonal sedge

Wikberg, Sofie LU and Svensson, BM (2003) In Journal of Ecology 91(5). p.847-854
Abstract
1 In a calcareous dry grassland community in central Europe genets of the clonal sedge Carex humilis form very distinct rings of densely aggregated ramets. As genet growth form is generated by ramet population dynamics, ramet demography must be studied in order to understand how rings develop. We analysed how ramet demography in C. humilis depends on ramet position within the ring and how this is linked to ramet size. 2 The per ramet population growth rate was > 1 at the periphery of rings but < 1 in the interior, meaning that the population increases at the periphery but decreases in the interior. The population growth rate differed mainly because ramets were smaller in the interior and because smaller ramets produced fewer... (More)
1 In a calcareous dry grassland community in central Europe genets of the clonal sedge Carex humilis form very distinct rings of densely aggregated ramets. As genet growth form is generated by ramet population dynamics, ramet demography must be studied in order to understand how rings develop. We analysed how ramet demography in C. humilis depends on ramet position within the ring and how this is linked to ramet size. 2 The per ramet population growth rate was > 1 at the periphery of rings but < 1 in the interior, meaning that the population increases at the periphery but decreases in the interior. The population growth rate differed mainly because ramets were smaller in the interior and because smaller ramets produced fewer vegetative ramets. It is unlikely that the smaller ramet size is caused by negative density dependence, interspecific competition, internal control or resource depletion. 3 The study covered four growing seasons and we found considerable variation in ramet demography between years. The net result for the 4 years was that the total number of C. humilis ramets in the population increased. However, both production of vegetative ramets and ramet size decreased during the study period and if this trend continues population size will instead decrease. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
type, phalanx, dry calcareous grassland, Carex humilis, central die-back, ramet population growth rate
in
Journal of Ecology
volume
91
issue
5
pages
847 - 854
publisher
Wiley-Blackwell
external identifiers
  • wos:000185446200012
  • scopus:0141993508
ISSN
1365-2745
DOI
10.1046/j.1365-2745.2003.00817.x
language
English
LU publication?
yes
id
bf0780ae-15b5-4489-a244-32868d5efde0 (old id 300138)
date added to LUP
2007-09-24 08:48:28
date last changed
2018-10-03 10:59:34
@article{bf0780ae-15b5-4489-a244-32868d5efde0,
  abstract     = {1 In a calcareous dry grassland community in central Europe genets of the clonal sedge Carex humilis form very distinct rings of densely aggregated ramets. As genet growth form is generated by ramet population dynamics, ramet demography must be studied in order to understand how rings develop. We analysed how ramet demography in C. humilis depends on ramet position within the ring and how this is linked to ramet size. 2 The per ramet population growth rate was &gt; 1 at the periphery of rings but &lt; 1 in the interior, meaning that the population increases at the periphery but decreases in the interior. The population growth rate differed mainly because ramets were smaller in the interior and because smaller ramets produced fewer vegetative ramets. It is unlikely that the smaller ramet size is caused by negative density dependence, interspecific competition, internal control or resource depletion. 3 The study covered four growing seasons and we found considerable variation in ramet demography between years. The net result for the 4 years was that the total number of C. humilis ramets in the population increased. However, both production of vegetative ramets and ramet size decreased during the study period and if this trend continues population size will instead decrease.},
  author       = {Wikberg, Sofie and Svensson, BM},
  issn         = {1365-2745},
  keyword      = {type,phalanx,dry calcareous grassland,Carex humilis,central die-back,ramet population growth rate},
  language     = {eng},
  number       = {5},
  pages        = {847--854},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Ecology},
  title        = {Ramet demography in a ring-forming clonal sedge},
  url          = {http://dx.doi.org/10.1046/j.1365-2745.2003.00817.x},
  volume       = {91},
  year         = {2003},
}