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  • Open Access

    ARTICLE

    Patch size and shape and their relationship with tree and shrub species richness

    Pincheira-Ulbrich1 J, JR Rau2, F Peña-Cortés1

    Phyton-International Journal of Experimental Botany, Vol.78, pp. 121-128, 2009, DOI:10.32604/phyton.2009.78.121

    Abstract The size and shape of 10 native forest patches were related to tree and shrub species richness in the pre coastal mountain range in Osorno province, southern Chile. Four regression models were adjusted (lineal, logarithm, exponential, and power regression) between patch size (area = x) and tree and shrub species richness (y). Patch shape was quantified through three indexes (Patton diversity index, compactness index and fractal dimension) which were correlated with the tree and shrub richness. Results allowed to conclude that (1) species richness tends to increase significantly with patch size; this relationship was explained More >

  • Open Access

    ARTICLE

    Molecular and cultural analysis of seasonal actinomycetes in soils from Artemisia tridentata habitat

    Gonzalez-Franco AC1, L Robles-Hernandez1, A Nuñez-Barrios1, JL Strap2, DL Crawford3

    Phyton-International Journal of Experimental Botany, Vol.78, pp. 83-90, 2009, DOI:10.32604/phyton.2009.78.083

    Abstract In order to understand the temporal dynamics of actinomycete communities of the rhizosphere of the desert plant Artemisia tridentata (sagebrush), two complementary methods were used. They were: (1) 16S rDNA-based PCR coupled with denaturing gradient gel electrophoresis (DGGE), and (2) an agar plate enumeration methodology in which three different media were used to quantify total bacteria, actinomycetes, and fungi. The objective of this research were: (1) to obtain a comprehensive picture of the structure of actinomycete populations, and (2) their dynamics in the rhizosphere of young and old sagebrush plants during two distinct seasons. PCR-DGGE analysis… More >

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