Establishment and spatial associations of recruits in meadow gaps
Article first published online: 29 OCT 2012
© 2012 International Association for Vegetation Science
Journal of Vegetation Science
Volume 24, Issue 3, pages 496–505, May 2013
How to Cite
Fibich, P., Vítová, A., Macek, P., Lepš, J. (2013), Establishment and spatial associations of recruits in meadow gaps. Journal of Vegetation Science, 24: 496–505. doi: 10.1111/j.1654-1103.2012.01486.x
- Issue published online: 2 APR 2013
- Article first published online: 29 OCT 2012
- Manuscript Accepted: 24 AUG 2012
- Manuscript Received: 7 MAR 2012
- GACR. Grant Numbers: 526/09/0963, 206/09/1471
- GAJU. Grant Numbers: 108/2010/P, 138/2010/P
- Meadow gap;
- Spatial pattern;
- Seed bank;
- Vegetative propagation
What is the spatio-temporal dynamics of recruit (seedlings and vegetative sprouts) establishment in meadow gaps? What processes prevail during recruit establishment? At what spatio-temporal scales do they operate?
A wet meadow in South Bohemia, a region of the Czech Republic.
We studied spatio-temporal dynamics in pattern of recruits (seedlings and vegetative sprouts) to characterize development and underlying ecological processes during gap colonization. We established four types of artificial gaps laid out in ten replicated blocks. To distinguish the effects of generative vs vegetative reproduction we used gaps with sterilized and non-sterilized soil (manipulating the seed bank), and manipulated the possibility of clonal spread by inserting mesh or felting along the borders of the gaps.
The majority of recruits appeared during July and August. Recruits were surrounded by empty spaces of 5–9 mm, and formed clumps of 20 mm or more. Clumping of even-aged seedlings and a lower number of vegetative recruits were observed in the gaps with non-sterilized soil. Overall, clonal spread was limited to the gap borders, being far less common than recruit establishment from seeds. The recruits emerged preferentially close to the gap centre where the temperature was highest as was the red to far–red ratio (R:FR). However, during the season, the majority of late recruits were observed in the southern, coolest parts of the gaps, reflecting the increasing importance of the facilitative effect of the surrounding vegetation.
Gaps were colonized predominantly from seeds; vegetative propagation was very slow and appeared at the end of the season. The presence of a seed bank enabled earlier gap colonization; the effect of seed rain became increasingly important during the season. The recruits were clumped, which further supports environmentally driven establishment, although other factors (e.g. facilitation) cannot be excluded. For the shortest distances, recruits were absent close neighbours due to the strongest competition. We therefore suggest that there was a spatial continuum between competition and facilitative effects among individual recruits.