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Research paper thumbnail of Estructura poblacional y parámetros demográficos de Juniperus flaccida Schltdl

Madera Bosques

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Research paper thumbnail of Germinacion de tres especies de Cephalocereus (Cactaceae) endemicas del Istmo de Tehuantepec, Mexico

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Research paper thumbnail of Rock–Soil Preferences of Three (Cactaceae) Species of Tropical Dry Forests

Soil Science Society of America Journal, 2010

ABSTRACT We examined rock soil plant relationships of three endemic Cactaceae species [Cephalocer... more ABSTRACT We examined rock soil plant relationships of three endemic Cactaceae species [Cephalocereus apicicephalium E.Y. Dawson, C nizandensis (Bravo & T. MacDoug.) Buxb., and C. totolapensis (Bravo & T. MacDoug.) Buxb.] from the tropical deciduous forest of the Tehuantepec River basin, Mexico. The goal was to explain the relationships between the species, rock, soil, and calcium oxalate. The x-ray diffraction patterns from the rock and soil analyses showed that the species do not share either a rock or a soil type. Cephalocereus apicicephalium grew exclusively on outcrops of limestone with quartz on the summit to backslope of the hill and C. nizandensis grew in metalimestone outcrops on the summit and shoulder of the hill, while C. totolapensis preferred acid soils from andesite, growing also on siltstones or on mica schist on the shoulder to toeslope of the hill. Although only insignificant quantities of soluble Ca were found in the soil, weddellite is abundant in the plant tissue. This suggests that the plants take up the Ca they need and that weddellite is a genetically fixed characteristic related to deflection of excess radiation or an herbivore deterrent. Energy dispersive x-ray analysis showed that calcium oxalate crystals contained other elements (Si, Mg, Na, K, Cl, and Fe) and that these impurities modified the crystal shape, as for bipyramids in totolapensis. Biominerals did not change the mineral composition of the soil. The three species are distributed as edaphic or rocky islands, giving rise to their allopatric and patchy distribution across the landscape. Finally, the endemicity of the three Cephalocereus species is promoted by the parent material and the particular soil conditions in the area in which each one grows.

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Research paper thumbnail of Plant species richness and diversity along an altitudinal gradient in the Sierra Nevada, Mexico

Diversity <html_ent glyph="@amp;" ascii="&"/> Distributions, 2005

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Research paper thumbnail of Leaf trait variation in three species through canopy strata in a semi-evergreen Neotropical forest

Canadian Journal of Botany, 2003

Page 1. NOTE Leaf trait variation in three species through canopy strata in a semi-evergreen Neot... more Page 1. NOTE Leaf trait variation in three species through canopy strata in a semi-evergreen Neotropical forest Laura Yáñez-Espinosa, Teresa Terrazas, Lauro López-Mata, and Juan Ignacio Valdez-Hernández Abstract: Morphological ...

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Research paper thumbnail of Morphological Seed Traits and Germination of Six Species of Pachycereeae (Cactaceae)♦

Journal of the Professional …, 2008

... Morphological seed traits and germination responses of freshly matured seeds of six species o... more ... Morphological seed traits and germination responses of freshly matured seeds of six species of Pachycereeae: Escontria chiotilla, Myrtillocactus geometrizans, Neobuxbaumia mezcalaensis, N. multiareolata, Pachycereus grandis, and Stenocereus queretaroensis were studied ...

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Research paper thumbnail of Cruz-Cárdenas G López-Mata L et al 2014 Potential species distribution REV MEX BIODIV 85

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Research paper thumbnail of Estructura poblacional y parámetros demográficos de Juniperus flaccida Schltdl

Madera Bosques

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Research paper thumbnail of Germinacion de tres especies de Cephalocereus (Cactaceae) endemicas del Istmo de Tehuantepec, Mexico

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rock–Soil Preferences of Three (Cactaceae) Species of Tropical Dry Forests

Soil Science Society of America Journal, 2010

ABSTRACT We examined rock soil plant relationships of three endemic Cactaceae species [Cephalocer... more ABSTRACT We examined rock soil plant relationships of three endemic Cactaceae species [Cephalocereus apicicephalium E.Y. Dawson, C nizandensis (Bravo &amp; T. MacDoug.) Buxb., and C. totolapensis (Bravo &amp; T. MacDoug.) Buxb.] from the tropical deciduous forest of the Tehuantepec River basin, Mexico. The goal was to explain the relationships between the species, rock, soil, and calcium oxalate. The x-ray diffraction patterns from the rock and soil analyses showed that the species do not share either a rock or a soil type. Cephalocereus apicicephalium grew exclusively on outcrops of limestone with quartz on the summit to backslope of the hill and C. nizandensis grew in metalimestone outcrops on the summit and shoulder of the hill, while C. totolapensis preferred acid soils from andesite, growing also on siltstones or on mica schist on the shoulder to toeslope of the hill. Although only insignificant quantities of soluble Ca were found in the soil, weddellite is abundant in the plant tissue. This suggests that the plants take up the Ca they need and that weddellite is a genetically fixed characteristic related to deflection of excess radiation or an herbivore deterrent. Energy dispersive x-ray analysis showed that calcium oxalate crystals contained other elements (Si, Mg, Na, K, Cl, and Fe) and that these impurities modified the crystal shape, as for bipyramids in totolapensis. Biominerals did not change the mineral composition of the soil. The three species are distributed as edaphic or rocky islands, giving rise to their allopatric and patchy distribution across the landscape. Finally, the endemicity of the three Cephalocereus species is promoted by the parent material and the particular soil conditions in the area in which each one grows.

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Research paper thumbnail of Plant species richness and diversity along an altitudinal gradient in the Sierra Nevada, Mexico

Diversity <html_ent glyph="@amp;" ascii="&"/> Distributions, 2005

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Research paper thumbnail of Leaf trait variation in three species through canopy strata in a semi-evergreen Neotropical forest

Canadian Journal of Botany, 2003

Page 1. NOTE Leaf trait variation in three species through canopy strata in a semi-evergreen Neot... more Page 1. NOTE Leaf trait variation in three species through canopy strata in a semi-evergreen Neotropical forest Laura Yáñez-Espinosa, Teresa Terrazas, Lauro López-Mata, and Juan Ignacio Valdez-Hernández Abstract: Morphological ...

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Research paper thumbnail of Morphological Seed Traits and Germination of Six Species of Pachycereeae (Cactaceae)♦

Journal of the Professional …, 2008

... Morphological seed traits and germination responses of freshly matured seeds of six species o... more ... Morphological seed traits and germination responses of freshly matured seeds of six species of Pachycereeae: Escontria chiotilla, Myrtillocactus geometrizans, Neobuxbaumia mezcalaensis, N. multiareolata, Pachycereus grandis, and Stenocereus queretaroensis were studied ...

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Research paper thumbnail of Cruz-Cárdenas G López-Mata L et al 2014 Potential species distribution REV MEX BIODIV 85

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