Strong genetic structure and signs of population bottlenecks in the land snail Humboldtiana durangoensis in the Sierra Madre Occidental of Western Mexico

2017 ◽  
Vol 55 (4) ◽  
pp. 288-297 ◽  
Author(s):  
Benjamín López ◽  
Rocío Gómez ◽  
Omar Mejía
Keyword(s):  
Genetic Structure ◽  
Land Snail ◽  
Population Bottlenecks ◽  
Sierra Madre Occidental ◽  
Western Mexico ◽  
Sierra Madre

A Revision of the Archaeological Sequence in Sinaloa, Mexico

1960 ◽  
Vol 25 (4) ◽  
pp. 547-561 ◽  
Author(s):  
J. Charles Kelley ◽  
Howard D. Winters
Keyword(s):  
Cross Correlation ◽  
Southern Illinois ◽  
Sierra Madre Occidental ◽  
Western Mexico ◽  
Sierra Madre ◽  
Southern Illinois University ◽  
Coastal Strip

AbstractAn archaeological sequence for the Sinaloa coastal strip of western Mexico had previously been developed by Sauer and Brand, Isabel Kelly, and Gordon Ekholm. Investigations carried out by Southern Illinois University and associates from 1952 to 1958 in Durango, across the Sierra Madre Occidental to the east of Sinaloa, have established an independent archaeological sequence. The presence of trade pottery and other artifacts from Sinaloa in the Durango sites makes possible an independent check of the Sinaloa sequence. This cross correlation essentially confirms the basic Sinaloa sequence of (early to late) Chametla, Aztatlan, and Culiacan periods, but indicates that there is some overlap between these major horizons and that the Aztatlan period is actually divisible into three more or less sequent phases: an early Lolandis phase, an intermediate Acaponeta phase, and a terminal Guasave phase. Re-examination of the Sinaloa sequence confirms and expands these conclusions, resulting in this revision of the archaeological sequence for Sinaloa. For consistency, a revised terminology for the various phases is also presented.

In disentangling two species limits of Hechtia (Bromeliaceae: Hechtioideae) from Sierra Madre Occidental, a new species is discovered from Durango, Mexico

Phytotaxa ◽  
2021 ◽  
Vol 523 (1) ◽  
pp. 55-72
Author(s):  
IVÓN RAMÍREZ-MORILLO ◽  
PABLO CARRILLO-REYES ◽  
JOSÉ LUIS TAPIA-MUÑOZ ◽  
CLAUDIA J. RAMÍREZ-DÍAZ
Keyword(s):  
New Species ◽  
Geographical Distribution ◽  
Conservation Status ◽  
Sierra Madre Occidental ◽  
Plant Parts ◽  
Western Mexico ◽  
Sierra Madre ◽  
A New Species ◽  
Female Flowers ◽  
Iucn Criteria

Epitypes are proposed for two species of Hechtia: H. subalata and H. jaliscana, both endemic to Western Mexico. The holotypes of both species consist of fruiting specimens. While the female flowers of both species are extremely similar, the staminate ones are noticeable different: we select staminate vouchers as epitypes to clearly circumscribe both taxa. As a result of the delimitation of the concept Hechtia subalata and its geographical distribution, we identify a new species from Durango, Mexico, previously misidentified as Hechtia subalata: Hechtia marthae. We provide images portraying plant parts of all species, as well as photographs in habitat. Finally, assessments of the conservation status of the three species sensu IUCN criteria are included.

scholarly journals Local migrations of insectivorous birds in western Mexico: implications for the protection and conservation of their habitats

1994 ◽  
Vol 4 (2-3) ◽  
pp. 129-142 ◽  
Author(s):  
Jorge Nocedal
Keyword(s):  
Tropical Forests ◽  
Short Distance ◽  
Tropical Species ◽  
Mountain Range ◽  
Insectivorous Birds ◽  
Long Distance ◽  
Sierra Madre Occidental ◽  
Western Mexico ◽  
The Pacific ◽  
Sierra Madre

SummaryIn this study I present data suggesting altitudinal movements of some species of foliage-gleaning insectivorous birds and related species of an oak-pine woodland of western Mexico. These movements can be regarded as short-distance or local migrations because the species involved breed in the woodlands and forests of the Sierra Madre Occidental highlands and winter in the tropical forests of the Pacific lowlands. Nine species of insectivorous birds out of 17 breed at the study site in the mountains of southern Durango and move to the lowlands in the winter; these can be regarded as short-distance or local migrants. In Mexico tropical deciduous and semi-deciduous forests are distributed mostly in the Pacific lowlands in the states of Sinaloa, Durango, Nayarit and Jalisco. Tropical forests of the Pacific lowlands are very important as wintering grounds for both North American and local west-Mexican migrants; however, there is only one protected area in western Mexico which to some degree includes these two types of tropical forests, and it is not located in the Sierra Madre Occidental, the most important mountain range in Mexico in terms of length and area covered. In addition, these tropical forests are the northern limit of the range for many tropical species. At present, these habitats are not threatened seriously by human activities (mainly forestry and cattle-raising) but this might change at any moment. At the study site the temperate highlands of southern Durango are already under the protection of “La Michilía” Biosphere Reserve, but a proposal to enlarge the area of the reserve to include the valley of the Río Mezquital and the western slope of the valley will increase the diversity of habitats, both temperate and tropical. As a consequence more bird species, as well as other taxa, will be protected in their natural environments. Such a proposal must be supported by field evidence on actual habitat use both during the breeding and wintering season, by local and long-distance migrants, in order to assess accurately the importance of this area as a representative place of western Mexico.

Spatial genetic structure in four Pinus species in the Sierra Madre Occidental, Durango, Mexico

2017 ◽  
Vol 47 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Javier Hernández-Velasco ◽  
José Ciro Hernández-Díaz ◽  
Matthias Fladung ◽  
Álvaro Cañadas-López ◽  
José Ángel Prieto-Ruíz ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Sustainable Management ◽  
Isolation By Distance ◽  
Spatial Genetic Structure ◽  
Wind Pollination ◽  
High Wind ◽  
Sierra Madre Occidental ◽  
Length Polymorphisms ◽  
Amplified Fragment Length Polymorphisms ◽  
Sierra Madre

In this study, we examined the spatial genetic structure (SGS) in extensively managed, but naturally regenerated forest stands of Pinus cembroides Zucc., Pinus discolor Bailey et Hawksworth, Pinus durangensis Martínez, and Pinus teocote Schiede ex Schltdl. & Cham. at local (within the stands) and large (among the stands) scales using amplified fragment length polymorphisms (AFLP), with respect to conservation and sustainable management of genetic resources of these species. Because these four pine species grow in different landscape structures, we expected to find differences in their SGS, although all of them are widely spread, wind pollinated, and often occur at high population densities. At the local scale, there was no evidence of significant SGS in the four species under study (except in 1 out of 18 seed stands), suggesting that the genetic variants of these species are almost always randomly distributed in space, probably due to high wind pollination and seed dispersal. At a larger scale, the significant SGS found may be the result of isolation by distance among populations. We recommend (i) establishing a tight network of seed stands, with a maximum distance of 3–11 km between seed stands, to prevent greater loss of local genetic structure, and (ii) using these seeds to establish reforestations within a maximal radius of 3–5 km from seed provenances.

A re-evaluation of taxonomy in Quercus section Lobatae subsection Racemiflorae (Fagaceae), resurrection of the name Q. pennivenia and description of a new taxon, Q. huicholensis

Phytotaxa ◽  
2020 ◽  
Vol 471 (3) ◽  
pp. 247-257
Author(s):  
ROSS A. MCCAULEY ◽  
KEN OYAMA
Keyword(s):  
New Taxon ◽  
Species Relationships ◽  
Sierra Madre Occidental ◽  
Western Mexico ◽  
Sierra Madre ◽  
Distinct Lineage ◽  
New Evidence

Changes to the taxonomy of Quercus section Lobatae subsection Racemiflorae occurring in western Mexico are here made to reflect new evidence regarding species relationships of two lineages occurring in the southern Sierra Madre Occidental. The name Q. pennivenia is resurrected to recognize plants previously included under the name Q. urbanii. A new taxon, Q. huicholensis, is described to represent a distinct lineage segregated from Q. conzattii. With these nomenclatural changes we recognize the subsection Racemiflorae to consist of six taxa and we provide a key for their determination.

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