Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
GENETIC CONSEQUENCES OF SEED DISPERSAL IN 3 SYMPATRIC FOREST HERBS .2. MICROSPATIAL GENETIC-STRUCTURE WITHIN POPULATIONS
Autore:
WILLIAMS CF;
Indirizzi:
NEBRASKA WESLEYAN UNIV,DEPT BIOL,5000 ST PAUL AVE LINCOLN NE 68504 UNIV WISCONSIN,DEPT BOT MADISON WI 53706
Titolo Testata:
Evolution
fascicolo: 6, volume: 48, anno: 1994,
pagine: 1959 - 1972
SICI:
0014-3820(1994)48:6<1959:GCOSDI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUTO-CORRELATION ANALYSIS; BY-DISTANCE MODEL; SPATIAL AUTOCORRELATION; PLANT-POPULATIONS; NEIGHBORHOOD SIZE; AVENA-BARBATA; FLOW; LANCEOLATA; BIOLOGY; DIFFERENTIATION;
Keywords:
F-STATISTICS; ISOLATION BY DISTANCE; ISOZYMES; MICROSPATIAL GENETIC STRUCTURE; POPULATION DENSITY; SEED DISPERSAL; SPATIAL AUTOCORRELATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
64
Recensione:
Indirizzi per estratti:
Citazione:
C.F. Williams, "GENETIC CONSEQUENCES OF SEED DISPERSAL IN 3 SYMPATRIC FOREST HERBS .2. MICROSPATIAL GENETIC-STRUCTURE WITHIN POPULATIONS", Evolution, 48(6), 1994, pp. 1959-1972

Abstract

Significant spatial genetic differentiation over short distances was detected by F-statistics and spatial autocorrelation within populations of the temperate forest herbs Cryptotaenia canadensis, Osmorhiza claytonii and Sanicula odorata (Apiaceae). Differences among the three species were consistent with estimates of their seed-dispersal abilities. Populations of Cryptotaenia, with the most limited seed dispersal, are characterized by genetic structure at smaller spatial scales than those of Osmorhiza or Sanicula, as indicated by higher estimates of theta(F-st), larger autocorrelation coefficients, and correlograms with more distant x-intercepts. Although spatial autocorrelation was somewhat more sensitive to the distribution of rare alleles than F-statistics, the two methods were generally concordant. Genetic structure was more pronounced, and inbreeding coefficients larger, in low-density, patchy populations than in a high-density site. Observed patterns of spatial autocorrelation, particularly for Cryptotaenia, were in agreement with expectations based on simulations of isolation by distance. The magnitude of observed autocorrelations was less than those typically produced in computer-simulation studies, but this discrepancy between empirical and theoretical results probably is derived from a lack of genetic and demographic equilibrium in natural populations. Isolation by distance can be an important evolutionary force organizing spatial genetic structure in plant populations, particularly in predominantly self-fertilizing species such as those studied here.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 22:55:24