Buscar
Mostrando ítems 1-10 de 215
Influence of the environmental heterogeneity of breeding ponds on anuran assemblages from southeastern Brazil
(Natl Research Council Canada-n R C Research Press, 2009-08-01)
We hypothesized that the environmental heterogeneity of breeding ponds influences the species composition and species richness of anuran assemblages from southeastern Brazil, because it provides humidity, shelter, and ...
Tolerance to high temperatures in tadpoles of Leptodactylus fuscus and Hyla fuscovaria in temporary ponds (Amphibia, Leptodactylidae, Hylidae)
(1991-12-01)
In temporary ponds tadpoles of the frogs Leptodactylus fuscus and Hyla fuscovaria may be exposed to temperatures up to 40-44°C. Experimental exposure to high temperature revealed survivals after 30 min at 42°C for H. ...
Late Pleistocene and Holocene paleoenvironments in ponds and alluvial sediments of Upper Paraná River, Brazil
(2013-01-01)
Freshwater sponge spicules were analyzed as a paleoenvironmental proxy indicator in five cores of ponds and alluvial fan sediments in the Upper Paraná River's left bank, near Querência do Norte town, northwestern of State ...
Effect of fertilization in water quality and in zooplankton community in open plankton-culture ponds
(Universidade Federal de Uberlândia (UFU), 2009-01-01)
The effect of swine manure fertilization on the water quality of zooplankton artificial culture in two ponds was measured in diel cycles on different months (October 1999, January and March 2000). Fertilization affected ...
Niche occupancy and the relative role of micro-habitat and diet in resource partitioning among pond dwelling tadpoles.
(2009-12-01)
We determined microhabitat and diet niche for tadpoles from two ponds in an agricultural landscape. Additionally, we verified the intraspecific variation in resource use, and if diet and microhabitat use were correlated. ...
Microbiology quality in continuous water flow fish ponds
(Universidade Estadual de Londrina (UEL), 2011-01-01)
The study verified sanitary aspects in fish ponds with sequential disposal and the effect of the tanks effluent in parallel in the system. Six fish ponds were studied in the dry and the rainy periods and were analyzed ...
Dependence of anuran diversity on environmental descriptors in farmland ponds
(Springer, 2012-06-01)
In the Neotropics, conversion of natural habitats into agricultural areas is occurring at a high rate, with consequent reduction of habitat complexity in anuran breeding ponds. Identifying features of farmland ponds that ...
Holocene paleoclimatic reconstruction based on the Lagoa Dourada deposits, southern Brazil
(2003-09-01)
The Lagoa Dourada is a circular-shaped pond formed on the Furnas Formation (Devonian of the Paraná Basin), filled by late Pleistocene - Holocene sediments. It lies in the hydrographic basin of the Guabiroba River, a tributary ...
The role of spatial and temporal descriptors for neotropical tadpole communities in southern Brazil
(Springer, 2009-05-01)
We evaluated tadpole communities of temporary and permanent ponds, in order to understand how community richness varies monthly in a subtropical humid climate, to interpret the community structure in relation to biotic and ...
Population structure of pond-raised Macrobrachium amazonicum with different stocking and harvesting strategies
(Elsevier B.V., 2010-09-21)
The effect of size-grading of juveniles prior to stocking, as well as selective harvesting, on the population structure of pond-raised Macrobrachium amazonicum was studied. A randomized-complete-blocks design with 4 ...