Genetic imprints of Brosimum alicastrum Sw. in Mexico
Por:
Lopez-Barrera, Gabriela, Ochoa-Zavala, Maried, Quesada, Mauricio, Harvey, Nick, Nunez-Farfan, Juan, Gonzalez-Rodriguez, Antonio, Rocha-Ramirez, Victor, Oyama, Ken
Publicada:
1 sep 2021
Ahead of Print:
1 sep 2021
Resumen:
Premise The mechanisms generating the geographical distributions of
genetic diversity are a central theme in evolutionary biology. The
amount of genetic diversity and its distribution are controlled by
several factors, including dispersal abilities, physical barriers, and
environmental and climatic changes. We investigated the patterns of
genetic diversity and differentiation among populations of the
widespread species Brosimum alicastrum in Mexico. Methods Using nuclear
DNA microsatellite data, we tested whether the genetic structure of B.
alicastrum was associated with the roles of the Trans-Mexican Volcanic
Belt and the Isthmus of Tehuantepec as geographical barriers to gene
flow and to infer the role of past events in the genetic diversity
patterns. We further used a maximum-likelihood population-effects mixed
model (MLPE) to identify the main factor affecting population
differentiation in B. alicastrum. Results Our results suggested that
Mexican B. alicastrum is well differentiated into three main lineages.
Patterns of the genetic structure at a finer scale did not fully
correspond to the current geographical barriers to gene flow. According
to the MLPE mixed model, isolation by distance is the best model for
explaining the genetic differentiation of B. alicastrum in Mexico.
Conclusions We propose that the differentiation patterns might reflect
(1) an ancient differentiation that occurred in Central and South
America, (2) the effects of past climatic changes, and (3) the functions
of some physical barriers to gene flow. This study provides insights
into the possible mechanisms underlying the geographic genetic variation
of B. alicastrum along a moisture gradient in tropical lowland forests.
Filiaciones:
Lopez-Barrera, Gabriela:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super ENES, Unidad Morelia, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Ochoa-Zavala, Maried:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super ENES, Unidad Morelia, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Quesada, Mauricio:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super ENES, Unidad Morelia, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
UNAM, Lab Nacl Anal & Sintesis Ecol LANASE, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Harvey, Nick:
Genet Marker Serv, 7 Windlesham Rd, Brighton BN1 3AG, E Sussex, England
Nunez-Farfan, Juan:
UNAM, Lab Genet Ecol & Evoluc, Inst Ecol, Av Univ 3000, Cd De Mexico 04510, Mexico
Gonzalez-Rodriguez, Antonio:
UNAM, Inst Invest Ecosistemas & Sustentabilidad, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Rocha-Ramirez, Victor:
UNAM, Inst Invest Ecosistemas & Sustentabilidad, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Oyama, Ken:
Univ Nacl Autonoma Mexico, Escuela Nacl Estudios Super ENES, Unidad Morelia, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
UNAM, Lab Nacl Anal & Sintesis Ecol LANASE, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
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