Abstract
The effect of colonization on the distribution of genetic diversity within and among populations in relation to species characteristics remains an open empirical question. The objective of this study was to contrast genetic diversity within and among established and colonizing populations of Nassauvia lagascae var. lanata on Volcán Lonquimay (Araucanía Region, Chile), which erupted on 25 December 1988, and relate genetic diversity to biological characteristics of the populations. We analyzed a total of 240 individuals from 15 populations distributed along the Andes Cordillera using AFLP and obtained a total of 307 AFLP bands, of which 97.7% are polymorphic. Values of population differentiation (F(ST)) did not differ significantly among established and colonizing populations, but colonizing populations did have reduced levels of genetic divergence (as indicated by private and rare bands) and genetic variation (e.g., Shannon index). We conclude that a founder effect through limited numbers of founding propagules derived from nearby source populations has not yet been compensated for by subsequent population growth and migration. Low rates of secondary dispersal via running water, kin-structure within populations, and slow population growth seem to contribute to the slow recovery of genetic diversity.
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Claims 6
Claim · model-written summary
Of 307 AFLP bands, 97.7% were polymorphic.
- Taxon
- Nassauvia lagascae var. lanata
Nassauvia lagascaet0 - Outcome
- polymorphice0
- Value
- 97.7%e0
- Setting
- Volcán Lonquimay, Chilet0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“obtained a total of 307 AFLP bands, of which 97.7% are polymorphic”
t0“Nassauvia lagascae var. lanata (Asteraceae: Mutisieae) on Volcán Lonquimay, Chile”
Claim · model-written summary
Population differentiation did not differ significantly between established and colonizing populations.
- Taxon
- Nassauvia lagascae var. lanataNassauvia lagascaet0
- Outcome
- population differentiation (F(ST))e0
- Direction
- did not differe0
- Comparator
- established and colonizing populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values of population differentiation (F(ST)) did not differ significantly among established and colonizing populations”
t0“Nassauvia lagascae var. lanata”
Claim · model-written summary
Colonizing populations had reduced genetic divergence indicated by private and rare bands.
- Taxon
- Nassauvia lagascae var. lanataNassauvia lagascaet0
- Material
- colonizing populationse0
- Outcome
- genetic divergencee0
- Direction
- reducede0
- Qualifier
- private and rare bandse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“colonizing populations did have reduced levels of genetic divergence (as indicated by private and rare bands)”
t0“Nassauvia lagascae var. lanata”
Claim · model-written summary
Colonizing populations had reduced genetic variation indicated by the Shannon index.
- Taxon
- Nassauvia lagascae var. lanataNassauvia lagascaet0
- Material
- colonizing populationse0
- Outcome
- genetic variatione0
- Direction
- reducede0
- Qualifier
- Shannon indexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“colonizing populations did have reduced levels of genetic divergence (as indicated by private and rare bands) and genetic variation (e.g., Shannon index)”
t0“Nassauvia lagascae var. lanata”
Claim · model-written summary
A founder effect from limited nearby founding propagules had not been offset by later growth and migration.
- Taxon
- Nassauvia lagascae var. lanataNassauvia lagascaet0
- Outcome
- has not yet been compensated fore0
- Qualifier
- a founder effect through limited numbers of founding propagules derived from nearby source populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a founder effect through limited numbers of founding propagules derived from nearby source populations has not yet been compensated for by subsequent population growth and migration”
t0“Nassauvia lagascae var. lanata”
Claim · model-written summary
Low secondary dispersal, within-population kin structure, and slow growth appeared to contribute to slow genetic diversity recovery.
- Taxon
- Nassauvia lagascae var. lanataNassauvia lagascaet0
- Outcome
- slow recovery of genetic diversitye0
- Qualifier
- Low rates of secondary dispersal via running water, kin-structure within populations, and slow population growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low rates of secondary dispersal via running water, kin-structure within populations, and slow population growth seem to contribute to the slow recovery of genetic diversity.”
t0“Nassauvia lagascae var. lanata”