Colonization-extinction and patch dynamics of the perennial riparian plant, Silene tatarica
Article first published online: 19 APR 2005
Journal of Ecology
Volume 93, Issue 4, pages 670–680, August 2005
How to Cite
JÄKÄLÄNIEMI, A., TUOMI, J., SIIKAMÄKI, P. and KILPIÄ, A. (2005), Colonization-extinction and patch dynamics of the perennial riparian plant, Silene tatarica. Journal of Ecology, 93: 670–680. doi: 10.1111/j.1365-2745.2005.01001.x
- Issue published online: 19 APR 2005
- Article first published online: 19 APR 2005
- Received 11 August 2004 revision accepted 20 December 2004 Handling Editor: Spencer Barrett
- environmental tracking;
- local dynamics;
- plant metapopulation;
- regional dynamics
- 1Although the concept of metapopulation is central to modern conservation biology, plant population biologists have divergent views concerning the importance of metapopulation dynamics.
- 2We studied the patch structure and colonization-extinction dynamics of Silene tatarica by mapping its distribution along a 43-km stretch of riverside subjected to annual flood disturbances. Plants were grouped into patches that were surveyed annually. The effect of spatial scale on dynamics was evaluated by varying the interplant separation used to determine grouping from 5 to 200 m. Using the 5-m criterion, the number of patches varied from 703 to 854 over the 5 years of the study.
- 3New patches were colonized by a few individuals and located on average 50 m away from the closest old patch. Recolonization of extinct patches was very rare. Small patches had the highest risk of extinction (5%) and, although floods can destroy even large populations, no large patches with flowering individuals became extinct.
- 4Elasticity analysis indicated that the survival of patches made a much greater contribution to patch dynamics than the production of new patches. Increasing patch scale decreased the rates of colonization and extinction as well as the projected finite rates of increase in patch number, but elasticities remained invariant.
- 5The river dynamics both create space for colonization and cause local extinctions, especially of small patches. The short-term dynamics of S. tatarica depend primarily on local dynamics but, in the long run, the species will track the availability of habitat, and its persistence will depend on a positive balance between colonization and extinction.
- 6This species from a transient environment does not exhibit the extinction-recolonization dynamics predicted for metapopulations at equilibrium. The rate of the dynamics of plant species in relation to the rate of habitat changes may be one of the key determinants of their regional dynamics.