Formulation and estimation of the effective size of stage-structured populations in Fritillaria camtschatcensis, a perennial herb with a complex lifehistory

Citation
K. Yonezawa et al., Formulation and estimation of the effective size of stage-structured populations in Fritillaria camtschatcensis, a perennial herb with a complex lifehistory, EVOLUTION, 54(6), 2000, pp. 2007-2013
Citations number
28
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Biology,"Experimental Biology
Journal title
EVOLUTION
ISSN journal
0014-3820 → ACNP
Volume
54
Issue
6
Year of publication
2000
Pages
2007 - 2013
Database
ISI
SICI code
0014-3820(200012)54:6<2007:FAEOTE>2.0.ZU;2-P
Abstract
The effective population size (N-e) is formulated based on a stage-structur ed population model and is estimated for two populations of Fritillaria cam tschatcensis (L.) Ker-Gawl. (Liliaceae), a perennial, mainly clonally repro ducing herb. Plants in these populations change life-history stages year by year, either upward or downward across three unambiguously identifiable st ages: one-leaf, nonflowering; multileaf nonflowering; and multileaf, flower ing stages. Plants of all stages produce clonal progeny (bulblets) each yea r, and death of plants occurs only in the first stage. The populations are nearly at equilibrium in both population size and stage structure. N-e is e stimated to be 20-30% of the census population size (N), leading to the pre diction that a population size of about 20,000 or more will be needed to co nserve the normal level of the gene diversity (N-e greater than or equal to 5000). With the current demographic pattern of this species, accelerated g rowth of the first-stage plants with reduced survival of the second- and th ird-stage plants will increase both the annual (N-y/N) and generation time (N-e/N) effective sizes of population.