Pre- and post-germination determinants of spatial variation in recruitment in the perennial herb Helleborus foetidus L. (Ranunculaceae)
Article first published online: 21 DEC 2004
Journal of Ecology
Volume 93, Issue 1, pages 60–66, February 2005
How to Cite
GARRIDO, J. L., REY, P. J. and HERRERA, C. M. (2005), Pre- and post-germination determinants of spatial variation in recruitment in the perennial herb Helleborus foetidus L. (Ranunculaceae). Journal of Ecology, 93: 60–66. doi: 10.1111/j.1365-2745.2004.00955.x
- Issue published online: 21 DEC 2004
- Article first published online: 21 DEC 2004
- Received 30 April 2004 revision accepted 6 October 2004; Handling Editor: Michael Hutchings
- Helleborus foetidus;
- path analysis;
- recruitment dynamics;
- structural equation modelling
- 1Recruitment in plant populations is a multiphase sequential process. An integrated view of the relationships between the stages and processes involved is therefore needed, but few studies have analysed the direct and indirect effects concerned. We propose a causal model of these relationships and use structural equation modelling (SEM) and path analysis to investigate the direct and indirect effects of pre- and post-germination processes on recruitment.
- 2We collected information on seed production, pre-dispersal seed losses, seed removal from the ground, seedling emergence and mortality, and seedling recruitment during the first year after emergence from 1 × 1 m plots centred on reproductive individuals in three geographically distant populations of the perennial herb Helleborus foetidus.
- 3The results suggest some congruence between the three populations and indicate that post-germination processes shape the spatial variation in recruitment more than pre-germination processes. Although between-plot variation in recruitment was mostly explained by seedling emergence and mortality, factors such as seed production and removal still have significant effects on recruitment through various, and frequently contrasting, pathways.
- 4Path analysis is a powerful analytical tool for revealing important aspects of the recruitment dynamics of plant populations and the factors determining their spatial variation. Such aspects, including indirect effects, are difficult to quantify with other, more classical, approaches to recruitment.