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Titolo:
Spatial population genetic structure in Trillium grandiflorum: The roles of dispersal, mating, history, and selection
Autore:
Kalisz, S; Nason, JD; Hanzawa, FM; Tonsor, SJ;
Indirizzi:
Univ Pittsburgh, Dept Biol Sci, Pittsburgh, PA 15260 USA Univ Pittsburgh Pittsburgh PA USA 15260 iol Sci, Pittsburgh, PA 15260 USA Iowa State Univ Sci & Technol, Dept Bot, Ames, IA 50011 USA Iowa State Univ Sci & Technol Ames IA USA 50011 t Bot, Ames, IA 50011 USA Pomona Coll, Dept Biol, Claremont, CA USA Pomona Coll Claremont CA USAPomona Coll, Dept Biol, Claremont, CA USA
Titolo Testata:
EVOLUTION
fascicolo: 8, volume: 55, anno: 2001,
pagine: 1560 - 1568
SICI:
0014-3820(200108)55:8<1560:SPGSIT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUTO-CORRELATION ANALYSIS; PLANT-POPULATIONS; SEED DISPERSAL; LOCAL-POPULATIONS; MIGRATION; FLOW; DIFFERENTIATION; AUTOCORRELATION; POLYMORPHISM; FREQUENCIES;
Keywords:
gene flow; population genetic structure; selection; spatial autocorrelation; spatial genetic structure; stage structure; Trillium grandiflorum;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Kalisz, S Univ Pittsburgh, Dept Biol Sci, Pittsburgh, PA 15260 USA Univ Pittsburgh Pittsburgh PA USA 15260 ittsburgh, PA 15260 USA
Citazione:
S. Kalisz et al., "Spatial population genetic structure in Trillium grandiflorum: The roles of dispersal, mating, history, and selection", EVOLUTION, 55(8), 2001, pp. 1560-1568

Abstract

The roles of the various potential ecological and evolutionary causes of spatial population genetic structure (SPGS) cannot in general be inferred from the extant structure alone. However, a stage-specific analysis can provide clues as to the causes of SPGS. We conducted a stage-specific SPGS analysis of a mapped population of about 2000 Trillium grandiflorum (Liliaceae),a long-lived perennial herb. We compared SPGS for juvenile (J), nonreproductive (NR), and reproductive (R) stages. Fisher's exact test showed that genotypes had Hardy-Weinberg frequencies at all loci and stage classes. Allele frequencies did not differ between stages. Bootstrapped 99% confidence intervals (99%CI) indicate that F-statistic values are indistinguishable fromzero, (except for a slightly negative F-IT for the R stage). Spatial autocorrelation was used to calculate f. the average kinship coefficient betweenindividuals within distance intervals. Null hypothesis 99%CIs for f were constructed by repeatedly randomizing genotypic locations. Significant positive fine-scale genetic structure was detected in the R and NR stages, but not in the J stage. This structure was most pronounced in the R stage, and declined by about half in each remaining stage: near-neighbor f = 0.122, 0.065 0.027, for R, NR, and J, respectively. For R and NR. the near-neighbor flies outside the null hypothesis 99%CI, indicating kinship at approximately the level of half-sibs and first cousins, respectively. We also simulatedthe expected SPGS of juveniles post dispersal, based on measured R-stage SPGS, the mating system. and measured pollen and seed dispersal properties. This provides a null hypothesis expectation (as a 99%CI) for the J-stage correlogram, against which to test the likelihood that post-dispersal events have influenced J-stage SPGS. The actual J correlogram lies within the nullhypothesis 99%CI for the shortest distance interval and nearly all other distance intervals indicating that the observed low recruitment. random mating and seed dispersal patterns are sufficient to account for the disappearance of SPSG between the R and the J stages. The observed increase in SPGS between J and R stages has two potential explanations: history and local selection. The observed low total allelic diversity is consistent with a past bottleneck: a possible historical explanation. Only a longitudinal stage-specific study of SPGS structure can distinguish between historical events and local selection as causes of increased structure with increasing life history stage.

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Documento generato il 30/11/20 alle ore 12:41:53