Abstract
Temporary aquatic environments are dependent on the rainfall distribution and form after extended periods of drought. The occurrence of groups of the cladoceran Moina micrura Kurz, 1874 was recorded in a temporary pool studied is located in the municipality of Monte Alegre de Sergipe, Sergipe State, Brazil. The mean abundance for each group was of 2,670 ± 2,089 individuals. Compared to other studies, we found a higher numbers of males (26 ± 6 individuals) and of ephippial females (30 ± 20 individuals). Therefore, the presence of males and ephippial females points to reproductive function of these groups, due to the dryness processes of these small pools.
Highlights
Studies in water pools allow a better understanding of the aquatic systems, because they have small and simple hydrodynamics, when compared to a man-made lake, and they are often temporary
The aim of this study is to report the occurrence of groups of Moina micrura Kurz, 1874 in a temporary environment in the drying process, presumably with reproductive functions, as indicated by the relatively high presence of males (0.1%) and females with resistant eggs and ephippia
Swarming of Moina micrura was found in the depressions of the temporary pool about 20 cm in diameter each (Figure 1b, c)
Summary
Studies in water pools allow a better understanding of the aquatic systems, because they have small and simple hydrodynamics, when compared to a man-made lake, and they are often temporary These characteristics, possibly, inhibit the interest of many researchers, and nowadays there are few studies in this type of environment, as Crispim & Freitas (2005) and Diniz et al (2013). The presence of males in the population is usually associated with some environmental stress, such as drought and/or drying, or predator presence. These individuals appear in order to form resistant eggs or ephippia, which ensure population maintenance after hatching, when the environment is once more favorable. These individuals appear in order to form resistant eggs or ephippia, which ensure population maintenance after hatching, when the environment is once more favorable. Figuerola and Green (2002) indicate that resistant eggs can exert a passive dispersion function, since they typically resist the passage through the digestive tract of birds, and probably other animals
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