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Titolo:
Effect of habitat fragmentation on the genetic structure of the narrow endemic Brongniartia vazquezii
Autore:
Gonzalez-Astorga, J; Nunez-Farfan, J;
Indirizzi:
Jardin Bot Clavijero, Inst Ecol, Xalapa 91000, Veracruz, Mexico Jardin BotClavijero Xalapa Veracruz Mexico 91000 91000, Veracruz, Mexico Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510,DF, Mexico Univ Nacl Autonoma Mexico Mexico City DF Mexico 04510 ty 04510,DF, Mexico
Titolo Testata:
EVOLUTIONARY ECOLOGY RESEARCH
fascicolo: 7, volume: 3, anno: 2001,
pagine: 861 - 872
SICI:
1522-0613(200111)3:7<861:EOHFOT>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION-SIZE; FOREST FRAGMENTATION; ACER-SACCHARUM; MATING SYSTEM; DIVERSITY; CONSERVATION; CONSEQUENCES; DIFFERENTIATION; VARIABILITY; BOTTLENECK;
Keywords:
Brongniartia vazquezii; conservation genetics; endemic and narrow species; gene flow; genetic structure; habitat fragmentation; Mexico;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Gonzalez-Astorga, J Jardin Bot Clavijero, Inst Ecol, AC,Km 2-5 Antigua Carretera & Coatepec, Xalapa 91000, Veracruz, Mexico Jardin Bot Clavijero AC,Km 2-5 Antigua Carretera & Coatepec Xalapa Veracruz Mexico 91000
Citazione:
J. Gonzalez-Astorga e J. Nunez-Farfan, "Effect of habitat fragmentation on the genetic structure of the narrow endemic Brongniartia vazquezii", EVOL EC RES, 3(7), 2001, pp. 861-872

Abstract

The monoecious, animal-pollinated shrub Brongniartia vazquezii is an endemic and endangered species of the tropical dry forests of Central Mexico. Deforestation of the tropical dry forest has fragmented the habitat and resulted in the isolation of the only four extant populations of R vazquezii. Inthis study, we assessed the genetic consequences of habitat fragmentation by comparing the genetic variability (allelic richness and expected mean heterozygosity, H.), gene flow and population differentiation in both adult (before fragmentation) and seedling (after fragmentation) populations. Six polymorphic enzymatic loci were used to estimate genetic parameters. F-statistics revealed a deficiency of heterozygous plants in both adults and seedlings in all populations. This probably results from geitonogamous selfing. Genetic diversity was lower in adult than in seedling populations (H-e = 0.201 and 0.357, respectively). Significant genetic differentiation among populations and of similar magnitude was detected for the adult and seedling populations (F-st = 0.1013 and 0.0705, respectively). Average gene flow between pairs of reproductive populations was high (Nm = 2.23). The genetic structure of adult and seedling populations of B. vazquezii suggests that habitat fragmentation has not reduced, as yet, allelic richness and genetic diversity, nor has it increased genetic differentiation. Furthermore, high levels of gene flow were found, suggesting that habitat fragmentation has broken the former population structure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 21:58:09