Briófitas do remanescente florestal do campus da Universidade Federal de São Carlos, município de Sorocaba, Estado de São Paulo, Brasil

The campus of the Universidade Federal de São Carlos, in the municipality of Sorocaba, is composed of a forest remnant characterized by vegetation of seasonal semidecidual tropical forest and cerrado. We recorded 96 species of bryophytes in the area: 56 mosses (Fissidentaceae is the richest, with 11 spp.) and 40 liverworts (Lejeuneaceae is the most representative, with 21 spp.). Eight species are endemic to Brazil and two were mentioned for the first time in the State of São Paulo (Fissidens allionii Broth. and Lejeunea subsessilis Spruce). The predominance of corticolous species and mat life form indicate a strong relationship with the microclimate conditions of the environment, as well as the availability of substrate. The simultaneous presence of species from the Atlantic Forest and the Cerrado indicates an transition zone bryoflora, at the same time that subcosmopolitan and ruderal species with wide distribution express the secondary character of the forest remnant.O campus da Universidade Federal de São Carlos do município de Sorocaba é composto por um remanescente florestal caracterizado por vegetação de mata estacional semidecidual e cerrado. Foram encontradas 96 espécies de briófitas na área: 56 musgos (sendo Fissidentaceae a família mais rica, com 11 spp.) e 40 hepáticas (sendo Lejeuneaceae a mais representativa, com 21 spp.). Oito espécies são endêmicas do Brasil e duas foram citadas pela primeira vez no Estado de São Paulo (Fissidens allionii Broth. e Lejeunea subsessilis Spruce). O predomínio de espécies corticícolas e da forma de vida em tapete indicam a forte relação com as condições microclimáticas do ambiente, assim como a disponibilidade de substrato. A presença simultânea de espécies da Mata Atlântica e do Cerrado indica uma área de transição, ao mesmo tempo que espécies de ampla distribuição, subcosmopolitas e ruderais expressam o caráter secundário do remanescente florestal

Biomass and elemental composition (C, N, H) of the periphytic community attached to Polygonum punctatum Ell. in a subtropical reservoir and its relationship to environmental factors

The periphytic communities in Brazilian reservoirs have been studied widely due to their importance for the assimilation of nutrients and their role at the base of the food chain. The objective of the present work was to analyse the environmental variables that influence the development of periphytic communities attached to stalks of the aquatic macrophyte Polygonum punctatum Ell. Five sample collections were made during 2010 at two sites in the Itupararanga reservoir (Ibiua, Sao Paulo, Brazil). The macrophyte was collected, and the periphytic community attached to its stalks was scraped off with a brush and jets of distilled water. Using a PLS analysis, we observed that 94.3% of the variation in periphyton biomass could be explained by concentrations of nitrate, conductivity, dissolved oxygen, water clarity and dissolved inorganic phosphorous. According to the indices applied, in 2010 the biomass of the periphytic community in the reservoir was low and predominantly heterotrophic, and the concentration of carbon in the periphyton was lower than that found in previous studies of this community.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES