2019
Sánchez, Agustín Molina; Delgado, Patricia; González-Rodríguez, Antonio; González, Clementina; Rojas, A. Francisco Gómez-Tagle; Lopez-Toledo, Leonel
Spatio-temporal approach for identification of critical conservation areas: a case study with two pine species from a threatened temperate forest in Mexico Artículo de revista
En: Biodiversity and Conservation, vol. 28, iss. 7, pp. 1863-1883, 2019, ISSN: 15729710.
Resumen | Enlaces | Etiquetas: Conservation, Habitat patches, Land use, Management, Micro-region, Pinus
@article{MolinaSanchez2019,
title = {Spatio-temporal approach for identification of critical conservation areas: a case study with two pine species from a threatened temperate forest in Mexico},
author = {Agustín Molina Sánchez and Patricia Delgado and Antonio González-Rodríguez and Clementina González and A. Francisco Gómez-Tagle Rojas and Leonel Lopez-Toledo},
url = {https://doi.org/10.1007/s10531-019-01767-y},
doi = {10.1007/s10531-019-01767-y},
issn = {15729710},
year = {2019},
date = {2019-01-01},
journal = {Biodiversity and Conservation},
volume = {28},
issue = {7},
pages = {1863-1883},
publisher = {Springer Netherlands},
abstract = {Fragmentation transforms natural habitats into a set of structurally and functionally differentiated small and separated patches, and causes the loss of connectivity among populations. In this study, we used a multi-temporal approach (1986, 2011 and 2016), to analyze the patterns of habitat fragmentation and to identify critical zones for the maintenance of habitat connectivity of two focal pine species (Pinus pseudostrobus and P. montezumae) with the broadest distribution and highest economic importance in the temperate forests of the Meseta Purépecha, in Michoacán, Mexico. This eco-region is currently one of the most threatened in terms of habitat degradation and extinction of forest communities. From a supervised classification of satellite images, land use coverage classes were selected and used as a basis to analyze the degree of landscape fragmentation using configuration and composition metrics and landscape connectivity based on the graph-theory approach. The fragmentation metrics suggested an increase in agricultural coverage (10.81%; fruits crop, mainly avocado), while the coverage of the forest showed a reduction (15.06%) and fragmentation throughout the study period. The landscape connectivity is lower (16.3% on average) and showed two highly important zones (Uruapan and Tancítaro) and one zone of high importance (Pátzcuaro) to maintain connectivity, considering three different dispersion distances (0.5, 5.0 and 10 km) for the species analyzed. We propose these three zones as potential habitat stepping stones to promote overall landscape connectivity, offering primary habitats and possible ecological resilience for this important forest ecosystem.},
keywords = {Conservation, Habitat patches, Land use, Management, Micro-region, Pinus},
pubstate = {published},
tppubtype = {article}
}
Fragmentation transforms natural habitats into a set of structurally and functionally differentiated small and separated patches, and causes the loss of connectivity among populations. In this study, we used a multi-temporal approach (1986, 2011 and 2016), to analyze the patterns of habitat fragmentation and to identify critical zones for the maintenance of habitat connectivity of two focal pine species (Pinus pseudostrobus and P. montezumae) with the broadest distribution and highest economic importance in the temperate forests of the Meseta Purépecha, in Michoacán, Mexico. This eco-region is currently one of the most threatened in terms of habitat degradation and extinction of forest communities. From a supervised classification of satellite images, land use coverage classes were selected and used as a basis to analyze the degree of landscape fragmentation using configuration and composition metrics and landscape connectivity based on the graph-theory approach. The fragmentation metrics suggested an increase in agricultural coverage (10.81%; fruits crop, mainly avocado), while the coverage of the forest showed a reduction (15.06%) and fragmentation throughout the study period. The landscape connectivity is lower (16.3% on average) and showed two highly important zones (Uruapan and Tancítaro) and one zone of high importance (Pátzcuaro) to maintain connectivity, considering three different dispersion distances (0.5, 5.0 and 10 km) for the species analyzed. We propose these three zones as potential habitat stepping stones to promote overall landscape connectivity, offering primary habitats and possible ecological resilience for this important forest ecosystem.
2015
Cavender-Bares, Jeannine; González-Rodríguez, Antonio; Eaton, Deren A. R.; Hipp, Andrew A. L.; Beulke, Anne; Manos, Paul S.
Phylogeny and biogeography of the american live oaks (Quercus subsection Virentes): A genomic and population genetics approach Artículo de revista
En: Molecular Ecology, vol. 24, iss. 14, pp. 3668-3687, 2015, ISSN: 1365294X.
Resumen | Enlaces | Etiquetas: Conservation, Ecological and climatic niches, Fossil calibration, Genomic data, introgression, Phylogeography, RADseq, Sea of Cortés, Virentes
@article{Cavender-Bares2015,
title = {Phylogeny and biogeography of the american live oaks (Quercus subsection Virentes): A genomic and population genetics approach},
author = {Jeannine Cavender-Bares and Antonio González-Rodríguez and Deren A. R. Eaton and Andrew A. L. Hipp and Anne Beulke and Paul S. Manos},
doi = {10.1111/mec.13269},
issn = {1365294X},
year = {2015},
date = {2015-01-01},
journal = {Molecular Ecology},
volume = {24},
issue = {14},
pages = {3668-3687},
abstract = {The nature and timing of evolution of niche differentiation among closely related species remains an important question in ecology and evolution. The American live oak clade, Virentes, which spans the unglaciated temperate and tropical regions of North America and Mesoamerica, provides an instructive system in which to examine speciation and niche evolution. We generated a fossil-calibrated phylogeny of Virentes using RADseq data to estimate divergence times and used nuclear microsatellites, chloroplast sequences and an intron region of nitrate reductase (NIA-i3) to examine genetic diversity within species, rates of gene flow among species and ancestral population size of disjunct sister species. Transitions in functional and morphological traits associated with ecological and climatic niche axes were examined across the phylogeny. We found the Virentes to be monophyletic with three subclades, including a southwest clade, a southeastern US clade and a Central American/Cuban clade. Despite high leaf morphological variation within species and transpecific chloroplast haplotypes, RADseq and nuclear SSR data showed genetic coherence of species. We estimated a crown date for Virentes of 11 Ma and implicated the formation of the Sea of Cortes in a speciation event ~5 Ma. Tree height at maturity, associated with fire tolerance, differs among the sympatric species, while freezing tolerance appears to have diverged repeatedly across the tropical-temperate divide. Sympatric species thus show evidence of ecological niche differentiation but share climatic niches, while allopatric and parapatric species conserve ecological niches, but diverge in climatic niches. The mode of speciation and/or degree of co-occurrence may thus influence which niche axis plants diverge along.},
keywords = {Conservation, Ecological and climatic niches, Fossil calibration, Genomic data, introgression, Phylogeography, RADseq, Sea of Cortés, Virentes},
pubstate = {published},
tppubtype = {article}
}
The nature and timing of evolution of niche differentiation among closely related species remains an important question in ecology and evolution. The American live oak clade, Virentes, which spans the unglaciated temperate and tropical regions of North America and Mesoamerica, provides an instructive system in which to examine speciation and niche evolution. We generated a fossil-calibrated phylogeny of Virentes using RADseq data to estimate divergence times and used nuclear microsatellites, chloroplast sequences and an intron region of nitrate reductase (NIA-i3) to examine genetic diversity within species, rates of gene flow among species and ancestral population size of disjunct sister species. Transitions in functional and morphological traits associated with ecological and climatic niche axes were examined across the phylogeny. We found the Virentes to be monophyletic with three subclades, including a southwest clade, a southeastern US clade and a Central American/Cuban clade. Despite high leaf morphological variation within species and transpecific chloroplast haplotypes, RADseq and nuclear SSR data showed genetic coherence of species. We estimated a crown date for Virentes of 11 Ma and implicated the formation of the Sea of Cortes in a speciation event ~5 Ma. Tree height at maturity, associated with fire tolerance, differs among the sympatric species, while freezing tolerance appears to have diverged repeatedly across the tropical-temperate divide. Sympatric species thus show evidence of ecological niche differentiation but share climatic niches, while allopatric and parapatric species conserve ecological niches, but diverge in climatic niches. The mode of speciation and/or degree of co-occurrence may thus influence which niche axis plants diverge along.