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  • 1
    Electronic Resource
    Electronic Resource
    Survival and growth of five species of Pinus seedlings after different approaches to competition control: “bridging” studies between Oregon and Mexico (1991)
    Springer
    New forests 5 (1991), S. 219-238 
    Details
    ISSN: 1573-5095
    Keywords: Site preparation ; herbicides ; manual weeding ; aspect ; Mexico ; Oregon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two species of pine native to Oregon and three native to Mexico were reciprocally planted in southwest Oregon and northeastern Mexico. The Oregon study site has very dry, hot summers; the Mexican site has hot, dry springs, but has rainy summers. Total rainfall and native genera are similar on both sites. Site-preparation trials were carried out on north and south slopes at both locations. For all species on both sites, survival on south slopes was satisfactory only with site-preparation treatments that gave near-complete vegetation control. Overall survival was best on north slopes in Mexico, and herb control was not required. Woody cover decreased survival and growth at all locations and aspect combinations. Chemical control improved survival, but the standing dead shade did reduce growth slightly as compared to growth on the totally cleared sites. Clearing without chemical control gave poor results in Oregon, but permitted good seedling survival and growth at the location in northeastern Mexico. Overall, ponderosa pine (Pinus ponderosa Dougl. ex Laws.) was the least sensitive species to environmental stress, and Hartweg pine (Pinus hartwegii Engelm.), the most sensitive. Mexican pines appeared to require more protection from water stress than did ponderosa pine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028113
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  • 2
    Electronic Resource
    Electronic Resource
    The desert vegetation of El Pinacate, Sonora, Mexico (1987)
    Springer
    Plant ecology 71 (1987), S. 49-60 
    Details
    ISSN: 1573-5052
    Keywords: Classification ; Generalised linear model ; Mexico ; Ordination: direct ; Ordination: indirect ; Perennial ; Plant community type ; Plant distribution ; Sonoran Desert
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Pinacate region is part of the Gran Desierto, one of the driest deserts in North America. The presence-absence of perennial plant species, together with soil and landform characteristics, were registered in 110 sampling sites within this region. A classification and ordination of plant communities showed soil and landform units to be good predictors of plant variation. Plant distribution and species richness were also strongly related to altitude and rockiness. A Generalised Linear Model was used to fit the response curves of individual species. The environmental factors related with plant distribution are indicators of the water regime within a given site. Plant communities repeat along topographic gradients the large-scale biogeographic variation of the Sonoran Desert. Microphyllous shrubs colonise the drier bajada slopes, while more diverse communities, dominated by cacti and drought-deciduous trees, grow on the wetter pediments and in pockets within rocky soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048511
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  • 3
    Electronic Resource
    Electronic Resource
    Boa constrictor, an introduced predator threatening the endemic fauna on Cozumel Island, Mexico (1999)
    Springer
    Biodiversity and conservation 8 (1999), S. 957-963 
    Details
    ISSN: 1572-9710
    Keywords: boa ; Boa constrictor ; Cozumel Island ; conservation ; insular fauna ; introduced predator ; introduction ; invasion ; Mexico
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present evidence indicating that the boa (Boa constrictor) was introduced onto Cozumel Island, Quintana Roo, Mexico, in 1971. This snake is now firmly established and has a wide distribution on Cozumel. We recorded an encounter rate of 1.8 boas per 100 km of forest surveyed. The introduction of the boa onto Cozumel, where it has few predators, is a threat to the existence of endemic and other native terrestrial vertebrates of the island. We recommend the following immediate actions: (1) undertake research to confirm the origin of the boa on Cozumel; (2) assess the effect of the boa on the biota of Cozumel; and, (3) if an anthropogenic origin is confirmed, an eradication programme for the boa on Cozumel should be undertaken, obtaining information on the biology and ecology of the species. Options for the destiny of the eradicated boas are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008815004072
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