Climate variables Argentina 4 Latitudinal gradient 4 Monthly temperature 4 Physical factors 4 Region 4 Regional climate change 4 South America 4 Spartina 4 Statistical downscaling 4 Techniques 4 Tidal salt-marshes 4 amplitude 4 biodiversity 4 climate change 4 downscaling 4 environmental conditions 4 environmental factor 4 environmental gradient 4 general circulation model 4 grass 4 landscape 4 latitudinal gradient 4 precipitation (climatology) 4 regional climate 4 salinity 4 saltmarsh 4 species diversity 4 species richness 4 statistical analysis 4