Papers by Jose Delgadillo Rodríguez
Biological Journal of the Linnean Society, 2020
We have examined the phylogeographical distribution of chloroplast DNA (cpDNA) lineages of Fouqui... more We have examined the phylogeographical distribution of chloroplast DNA (cpDNA) lineages of Fouquieria columnaris (Kellogg) Kellogg ex Curran (Fouquieriaceae) in the Sonoran Desert, to understand how historical climatic and/or geological changes have influenced genetic patterns in the species. Using two chloroplast intergenic DNA spacers (psbJ-petA and ndhF-rpl32), we found low levels of nucleotide diversity (π = 0.0025) but high levels of haplotype diversity (h = 0.9339). Analysis of 28 haplotypes revealed four lineages, one belonging to the continental massif and three to the peninsula of Baja California. This structure may be explained and dated by three events: (1) formation of the Gulf of California during the late Miocene (7.24 Mya), (2) activity of the Tres Vírgenes volcanic field (1.20 Mya) and (3) opening of the mid-peninsula seaway during the late Pleistocene (1.53 Mya). Furthermore, the cpDNA lineages show evidence for population contraction during the Last Glacial Maximum...
Biodiversity and Conservation, 2014
Modern agricultural practices pose serious threats to biodiversity worldwide. Species losses from... more Modern agricultural practices pose serious threats to biodiversity worldwide. Species losses from habitat conversion are well documented, but indirect impacts such as reduced water availability to adjacent ecosystems are less known. San Quintín is an important agricultural valley in the mediterranean climate region of Baja California, Mexico. The region is also a hotspot of plant species richness and endemism. Plant species in the region are here analyzed by comparison of the contemporary flora to historical botanical collections to identify extirpations. Historical collections indicate that habitat loss to agriculture has been a direct cause of species losses. As importantly, the unsustainable extraction of groundwater has apparently led to salt water intrusion, resulting in the loss of 22 native plant taxa, including 13 rare plants. Seventy-eight percent of all the vernal pool taxa have been lost from the flora (including 85 % of the rare taxa) and 11 % of plants of riparian and pond habitat (including 25 % of the rare taxa) are no longer found in the region. Unsustainable agricultural practices continue to threaten fragile coastal ecosystems and are a serious challenge to current and future conservation efforts. Ironically, Communicated by David Hawksworth.
3 Agradecimientos 5 Relación de humedales 7
Books by Jose Delgadillo Rodríguez
The vegetattion of the coniferous forest of Baja California, Mexico.
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Papers by Jose Delgadillo Rodríguez
Books by Jose Delgadillo Rodríguez