Publication: Comparación entre grupos de vegetación obtenidos mediante métodos multivariantes y sintáxones en la descripción de comunidades vegetales halófilas
Authors
Esteve Selma, Miguel A. ; Calvo Sendín, José Francisco ; Caballero Fernández-Rufete, José María
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Facultad de Biología
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Publisher
Murcia: Universidad de Murcia, Servicio de Publicaciones
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DOI
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info:eu-repo/semantics/article
Description
Abstract
En los saladares del Guadalentín (Murcia) se definieron, mediante métodos multivariantes, seis grupos de vegetación (A-F), cada uno de ellos caracterizado por la dominancia de determinadas especies halófilas o subhalófilas. En el presente trabajo, se utilizan técnicas de ordenación (análisis de correspondencias y análisis de correspondencias canónicas) para comparar cuatro de estos grupos (A-D) con sintáxones: asociaciones o subasociaciones descritas para el sureste ibérico o para la región mediterránea en general. Se exponen y se discuten las afinidades y discrepancias de cada grupo con los sintáxones supuestamente relacionados. En términos generales, la correspondencia entre grupos de vegetación y sintáxones no es buena, especialmente en el caso de los grupos B (caracterizado por la dominancia de Frankenia corymbosa o Limonium caesium) y D (caracterizado por la dominancia de Halocnemum strobilaceum). Las diferencias se pueden atribuir a las condiciones específicas de los saladares del Guadalentín, a los cambios de vegetación que tienen lugar en ellos o a la presencia de determinadas especies ausentes o escasas en otros saladares mediterráneos. En ocasiones, un grupo de vegetación se puede vincular a una asociación, pero, dentro del rango de variación de la misma, representa una determinada forma, asociada a circunstancias locales o particulares. Esto pone de manifiesto que la variación que se da dentro de las asociaciones o subasociaciones puede ser muy relevante ecológicamente, y que existen dificultades para extrapolar valores de parámetros ambientales entre distintas representaciones de una misma asociación.
Six vegetation groups (A-F) had been defined in the salt steppes of the Guadalentín (Murcia) by means of multivariate methods. Each of them is characterized by the dominance of certain halophytic or subhalophytic species. In the present paper, ordination techniques (correspondence analysis and canonical correspondence analysis) are used to compare four of these groups (A-D) with syntaxa –associations or subassocia tions described in Southeastern Spain or, more generally, in the Medi terranean region. The affinities and disagreements between each group and supposedly related syntaxa are shown and discussed. In general terms, there is not a good correspondence between vegetation groups and syntaxa, specially in the cases of group B (characterized by domi nance of Frankenia corymbosa or Limonium caesium) and group D (cha racterized by dominance of Halocnemum strobilaceum). The differen ces can be attributed to the particular conditions of the salt steppes of the Guadalentín, also to vegetation changes that are taking place in them or the presence of certain species which are scarce or absent in other mediterranean salt marshes and salt steppes. Sometimes a ve getation group can be related to an association but, within its range of variation, the group represents certain form linked to local or particular circumstances. This shows that the variation which exists within an association (or subassociation) can be very outstanding ecologically, and that there are difficulties to extrapolate environmental parameters from one representation of an association to another.
Six vegetation groups (A-F) had been defined in the salt steppes of the Guadalentín (Murcia) by means of multivariate methods. Each of them is characterized by the dominance of certain halophytic or subhalophytic species. In the present paper, ordination techniques (correspondence analysis and canonical correspondence analysis) are used to compare four of these groups (A-D) with syntaxa –associations or subassocia tions described in Southeastern Spain or, more generally, in the Medi terranean region. The affinities and disagreements between each group and supposedly related syntaxa are shown and discussed. In general terms, there is not a good correspondence between vegetation groups and syntaxa, specially in the cases of group B (characterized by domi nance of Frankenia corymbosa or Limonium caesium) and group D (cha racterized by dominance of Halocnemum strobilaceum). The differen ces can be attributed to the particular conditions of the salt steppes of the Guadalentín, also to vegetation changes that are taking place in them or the presence of certain species which are scarce or absent in other mediterranean salt marshes and salt steppes. Sometimes a ve getation group can be related to an association but, within its range of variation, the group represents certain form linked to local or particular circumstances. This shows that the variation which exists within an association (or subassociation) can be very outstanding ecologically, and that there are difficulties to extrapolate environmental parameters from one representation of an association to another.
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Citation
Anales de biología, vol. 24, 2002, 3-19
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