Abstract
A biogeographic analysis of 26 species of trees and shrubs occurring in the Parana River Delta (32° to 34 °30′ South latitude, 58° to 61° West longitude, Argentina) was performed to study the floristic and structural differences among deltaic woodland communities. Traditionally these variations have been interpreted as a consequence of the differential influence of local island geomorphology and flood dynamics on floristic successions. We performed a cluster analysis of collection site, obtained maps showing the joint occurrence of the species of each community, and related species ranges with the presence of possible migration corridors. Results suggest that, in addition to local variations in topography and flood persistence, changes in floristic richness can be understood as a consequence of the differential efficiency of the Parana and Uruguay Rivers as migration corridors for tropical species into temperate latitudes. Geomorphical stability of riverbeds and fluvial dynamic differences between rivers are discussed in relation to how they may explain the more efficient migration of species along the flood plain of the Uruguay River compared to the Parana River. Results allow us to re-interpret the relative importance of both rivers in the establishment of tropical and subtropical species in temperate latitudes, and to add a regional explanation for the observed floristic heterogeneity.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
