Publication: Relaciones especies-área en los saladares del Guadalentín (SE Ibérico, España) e implicaciones para la conservación, restauración y gestión
Authors
Pardo Sáez, María Teresa ; Calvo Sendín, José Francisco ; Caballero Fernández-Rufete, José María ; Esteve Selma, Miguel A.
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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 el presente trabajo se analiza la relación existente entre el número de especies vegetales en los fragmentos de los saladares del Guadalentín (SE Ibérico) y el área de los mismos, con objeto de obtener el modelo que describa dicha relación, explicarla en función de las teorías ecológicas propuestas y aplicar los resultados obtenidos a la consecución de criterios de conservación para la zona de estudio. Los
modelos potencial y exponencial proporcionan ajustes satisfactorios a
la hora de explicar la relación especies-área encontrada en los saladares del Guadalentín. El path analysis confirma que la contribución relativa del área sobre el número de especies se aproxima al doble de la correspondiente al hábitat, aunque en la explicación de la relación especies-área deberían ser consideradas tanto la Hipótesis del Equilibrio como la Hipótesis de Diversidad de Hábitats. El estudio de la relación especies-área resulta útil para la consecución de criterios de conservación. Así, los fragmentos a los que corresponden residuos positivos en la curva especies-área presentan un mayor interés de conservación, en relación con su mayor riqueza de especies, que los que poseen residuos negativos. Asimismo, la comparación de la curva especies-área con series de curvas obtenidas para agrupaciones de fragmentos realizadas al azar indica que en la zona de estudio no se produce efecto SLOSS (single large or several small reserves), por lo que resulta conveniente priorizar, frente a la conservación de un fragmento de área extensa, la correspondiente a un grupo de manchas de superficie más reducida que sumen la misma área total.
The aim of the study is to investigate the relationship between the number of plant species in Guadalentín salt steppe fragments and their area, in order to obtain the model describing this relation, to offer an explanation of species-area relationship by means of the main ecological theories and to apply the results to achieve conservation strategies for the study site. Power function and exponential models describe accurately the species-area relationship in Guadalentín salt steppes. Path analysis confirms that contribution of fragment size to species number is approximately twice that of habitats, although both Equilibrium Hypothesis and Habitat Diversity Hypothesis should be considered. The study of species-area relation constitutes a framework to obtain conservation strategies. So, fragments with positive residual va lues in the species-area curves could have more interest of conservation than those with negative residual values because of their greater species richness. Comparing the species-area curve with curves obtained with data for series of 2, 3 and 4 islands randomly selected, we conclude that SLOSS (single large or several small reserves) effect is not present in the study site. So, conservating two small fragments would be better than conservating a single large one of the same total area.
The aim of the study is to investigate the relationship between the number of plant species in Guadalentín salt steppe fragments and their area, in order to obtain the model describing this relation, to offer an explanation of species-area relationship by means of the main ecological theories and to apply the results to achieve conservation strategies for the study site. Power function and exponential models describe accurately the species-area relationship in Guadalentín salt steppes. Path analysis confirms that contribution of fragment size to species number is approximately twice that of habitats, although both Equilibrium Hypothesis and Habitat Diversity Hypothesis should be considered. The study of species-area relation constitutes a framework to obtain conservation strategies. So, fragments with positive residual va lues in the species-area curves could have more interest of conservation than those with negative residual values because of their greater species richness. Comparing the species-area curve with curves obtained with data for series of 2, 3 and 4 islands randomly selected, we conclude that SLOSS (single large or several small reserves) effect is not present in the study site. So, conservating two small fragments would be better than conservating a single large one of the same total area.
Citation
Anales de biología, vol. 25, 2003, 91-102
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