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Universidad de Buenos Aires (2012)

Vascular plants as modifying agents of coastal patagonian ecosistems

Sueiro, María Cruz

Titre : Vascular plants as modifying agents of coastal patagonian ecosistems

Plantas vasculares como agentes modificadores de ecosistemas en la costa patagónica

Auteur : Sueiro, María Cruz.

Université de soutenance : Universidad de Buenos Aires

Grade : Doctor en el área de Ciencias Biológicas 2012

Résumé
On Patagonian coasts, those environments which have the typical appearance of a rocky intertidal but are dominated by the type of vascular plants that dominate and characterize soft substratum salt marshes were recently designated as rocky salt marshes. Spartina densiflora, the dominant plant species in the rocky salt marshes surveyed, is considered a bioengineer due to its ability to modify, maintain, and / or create habitats. This study describes the physical and biological variables that are associated with the presence of this plant species and evaluates its effects on the structure of the associated macroinvertebrate assemblages. It was found that the presence of S. densiflora buffered of the stressful physical variables of intertidal environments and that their associated macroinvertebrate assamblages differ in their distribution and abundance from those found on unvegetated patches. Through manipulative experiments that included transplants of live plants and plastic structures simulating the architecture of S. densiflora, it was found that this halophyte has a positive effect on the abundance and richness of macroinvertebrate assemblages and that its physical structure was the major factor influencing the assemblages. This positive effect acted not only on local invertebrate species, but also favors the presence of a non native species of crustacean. These results provide novel information and highlight the central role played by the bioengineer Spartina densiflora in structuring invertebrate communities in Patagonian rocky salt marshes

Mots clés : BIOINGENIERIA ; SPARTINA DENSIFLORA ; MARISMAS ROCOSAS ; PATAGONIA ; COMUNIDADES ; INVERTEBRADOS ; BIOINGINEERING ; SPARTINA DENSIFLORA ; ROCKY SALT MARSHES ; PATAGONIA ; COMMUNITIES ; INVERTEBRATES

Présentation (Biblioteca Digital)

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Page publiée le 5 octobre 2017, mise à jour le 12 février 2020