Brandão, Luciana Pena MelloSant'Anna, Eneida Maria EskinaziBrito, Sofia LuizaBarbosa, Paulina Maria Maia2015-12-102015-12-102012BRANDÃO, L. P. M. et al. Fluctuations of the population of Daphnia laevis Birge 1878: a six-year study in a tropical lake. Brazilian Journal of Biology, v. 72, n. 3, p. 479-487, 2012. Disponível em: <http://www.scielo.br/pdf/bjb/v72n3/10.pdf>. Acesso em: 12 nov. 2015.1678-4375http://www.repositorio.ufop.br/handle/123456789/5957The fluctuation of the population of Daphnia laevis in Lake Jacaré (Middle River Doce, Minas Gerais) was monitored monthly (at one point in the limnetic region) for six years (2002-2007) as part of the Program of Long-Term Ecological Research (LTER/UFMG). The following parameters were also monitored: water temperature, pH, electrical conductivity, dissolved oxygen, chlorophyll a, total phosphorus, phosphate, total nitrogen, nitrate, nitrite, ammonia, and densities of Chaoborus and ephippia of Daphnia laevis in the sediment. A seasonal pattern was observed in the fluctuation of D. laevis, with higher densities recorded during periods of circulation (May-August). A significant correlation was found between the density of D. laevis and temperature (r = –0.47, p = 0.0001), chlorophyll-a (r = –0.32, p = 0.016) and indicators of the lake’s trophic status (total phosphorus, r = 0.32, p = 0.007 and trophic state, r = 0.36, p = 0.003), as well as Chaoborus density (r = 0.43 and p = 0.002). These results indicate that changes in the physical and chemical characteristics of the water related with stratification and circulation of the lake may have a direct (temperature, total phosphorous) or an indirect (food availability, presence of predators, ephippia eclosion) influence on the fluctuation of the D. laevis population.en-USTropical lakeTemperatureEphippiumEfípioLago tropicalArtigo publicado em periodicoTodo o conteúdo do periódico Brazilian Journal of Biology, exceto onde identificado, está sob uma licença Creative Commons que permite copiar, distribuir e transmitir o trabalho em qualquer suporte ou formato desde que sejam citados o autor e o licenciante. Não permite o uso para fins comerciais. Fonte: Brazilian Journal of Biology <http://www.scielo.br/scielo.php?script=sci_serial&pid=1519-6984&lng=en&nrm=iso>. Acesso em: 20 ago. 2019.http://dx.doi.org/10.1590/S1519-69842012000300010