@Article{Graco-RozaSoCoPaMiDoMa:2021:FuRaTh,
               author = "Graco-Roza, Caio and Soininen, Janne and Corr{\^e}a, Gilsineia 
                         and Pacheco, Felipe Siqueira and Miranda, Marcela Aparecida Campos 
                         Neves and Domingos, Patr{\'{\i}}cia and Marinho, Marcelo M.",
          affiliation = "{Universidade do Estado do Rio de Janeiro (UERJ)} and {University 
                         of Helsinki} and {Universidade do Estado do Rio de Janeiro (UERJ)} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade do Estado do Rio de Janeiro (UERJ)} and 
                         {Universidade do Estado do Rio de Janeiro (UERJ)}",
                title = "Functional rather than taxonomic diversity reveals changes in the 
                         phytoplankton community of a large dammed river",
              journal = "Ecological Indicators",
                 year = "2021",
               volume = "121",
                pages = "e107048",
                month = "Feb.",
             keywords = "River damming, Community distinctiveness, Functional dispersion, 
                         Land use, Reservoir.",
             abstract = "River damming reduces the dispersal rates of biota and filter 
                         species by altering the local environmental conditions. Although 
                         phytoplankton is a key biotic group to indicate changes in aquatic 
                         environments, the effects of river damming on the longitudinal 
                         distribution of phytoplankton communities are not widely 
                         addressed. Here we investigated the changes on the taxonomic and 
                         functional composition of the phytoplankton community in a large 
                         tropical dammed river. We expect compositional changes to be 
                         higher at taxonomic than functional level especially in the 
                         dam-free stretches of the river because running waters select 
                         species able to cope with the water turbulence. Furthermore, flow 
                         regulation allows species with different traits to colonize the 
                         increasingly lentic stretches resulting in higher functional 
                         diversity towards dams. Phytoplankton samples were taken in 210 
                         sites, spaced by 5 km, along the whole river channel. Data were 
                         split at a reservoir level considering the sites within 30 km 
                         before and after each dam to analyze the effects of damming on the 
                         community composition. Compositional changes were assessed by 
                         estimating the degree to which each community differed from all 
                         other communities within the regional pool (community 
                         distinctiveness) considering taxonomic and functional composition 
                         separately. Functional diversity was estimated as the degree to 
                         which species within the same community differed from each other 
                         with respect to their trait composition (functional dispersion). 
                         We used community-weighted means to test how the different traits 
                         were filtered by river damming. Furthermore, we assessed the 
                         effects of local environmental conditions on the phytoplankton 
                         taxonomic and functional composition using boosted regression 
                         trees (BRT). We observed no effects of river damming on species 
                         dispersal. Functional turnover was low, suggesting that 
                         compositional changes occurred mainly among functionally similar 
                         species. However, there was a noticeable reduction of 
                         phytoplankton diversity that persisted for more than 100 km after 
                         one of the dams. Flow regulation allowed flagellated and 
                         mucilaginous species to colonize the dammed areas. After the dams, 
                         such species were filtered due to the increase of water mixing 
                         downstream, as evidenced by a hump-shaped trend in the functional 
                         diversity of the sites within 30 km distance of the dams. BRT 
                         analyses highlighted the role of nutrient input in the dammed 
                         areas for the community compositional change. This study 
                         highlights the importance of considering both taxonomical and 
                         functional diversity to describe the effects of human intervention 
                         such as damming on aquatic ecosystems.",
                  doi = "10.1016/j.ecolind.2020.107048",
                  url = "http://dx.doi.org/10.1016/j.ecolind.2020.107048",
                 issn = "1470-160X",
             language = "en",
           targetfile = "roza_functional.pdf",
        urlaccessdate = "20 maio 2024"
}