Different scales determine the occurrence of aquatic macrophyte species in a tropical stream
Mori, Gisele Biem; Piedade, Maria Teresa Fernandez; Lopes, Aline; Ferraz, Silvio Frosini de Barros; Cancian, Leonardo Farage; Camargo, Antonio Fernando Monteiro
Acta Bot. Bras.
DATA DE PUBLICAÇÃO
ABSTRACT Distributions of aquatic macrophyte species are commonly associated with water chemistry characteristics. However, other environmental factors that can lead to the occurrence of aquatic plants in lotic ecosystems, such as dynamic habitats linked to the surrounding landscape, have been underestimated. This study aims to evaluate landscape features that may influence the occurrence of species of euhydrophyte aquatic macrophytes in a tropical river basin. We assessed the occurrence of the following seven species: Egeria densa, Cabomba furcata, Potamogeton pusillus, Potamogeton polygonus, Utricularia foliosa, Pistia stratiotes and Salvinia molesta. We also measured environmental variables related to three spatial scales, local (limnological), channel and riparian landscape, along 25.5 Km of the Itanhaém River basin (São Paulo, Brazil). We found that local (limnological) and channel characteristics were important variables in determining the occurrence of aquatic macrophyte species while the landscape scale had little influence on species composition. Channel depth and margin slope were especially relevant abiotic variables in explaining the occurrence of four of the species but not P. pusillus, P. polygonus and U. foliosa. Our results highlight the importance of channel morphology for understanding aquatic plant occurrence and community composition in tropical rivers.
- The invasive tropical tanner grass decreases diversity of the native aquatic macrophyte community at two scales in a subtropical tidal river
- Forecasting the impact of an invasive macrophyte species in the littoral zone through aquatic insect species composition
- Aquatic macrophyte mats as dispersers of one invasive plant species
- Spatial variations at different observational scales and the seasonal distributions of stream macroalgae in a Brazilian subtropical region
- Occurrence of Hirudinea species in a post urban reach of a Patagonian mountain stream