Sensitivity of ephemeral wetland swards with Isoetes histrix Bory to environmental variables: implications for the conservation of Mediterranean temporary ponds

摘要: Small-scale landscape elements such as freshwater ponds and pools remain poorly characterized vulnerable to destruction, despite their significant contribution regional aquatic biodiversity. Ephemeral wetland swards supporting Isoetes histrix, which are considered priority interest habitats by the European Habitats Directive on conservation of wild fauna flora (codex 3170* – Mediterranean temporary ponds), typify concave pond shorelines (Habitat A) very shallow flat B). It is hypothesized that although this sward type highly specialized for growth in waterlogged soils, it sensitive changes composition seasonal dynamics related varied environmental conditions. The present study was aimed at comparing plant assemblages, successional processes during growing season between different habitat types; identifying key factors influencing spatial variability. Vegetation sampled three times two types (i.e A B). At each site a range variables also recorded. PERMANOVA analysis indicated assemblages differed throughout season. hydroperiod length main factor responsible specificity habitats, revealed CCA. However, pattern similar habitats. The results confirmed hypothesis, strengthened understanding relevance ephemeral ponds. The exhibit unique characteristics, represent aspects 3170*; therefore, ensure highest level biodiversity maintained, measures must be taken protect both habitats. Copyright © 2012 John Wiley & Sons, Ltd.