Navegando por Autor "Souza, Mauro Schettino de"

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    Influence of experimental illumination and seasonal variation on crossbreeding matinf in the snail Biomphalaria glabrata.
    (1988) Souza, Fernando Pimentel; Schall, Virgínia Torres; Barbosa, Norma Dulce de Campos; Souza, Mauro Schettino de; Lautner Júnior, Rodolfo
    The crossbreeding activities of the Schistosoma mansoni vector snail Biomphalaria glabrata were counted in a laboratory aquarium throughout the year under two regimes of 12h light: 12h dark from 7 A., M. to 10 P. M. Mating increased significantly in Authmn and Winter and just missed a significant inverse correlation with temperature and a direct one with locomotion. Other similar experiments were carried out to compare mating under various ilumination conditions in complete daily cycle measurements. Mating counts decreased under the regimes which submited snail to a total exposure of 12h light and 12 dark during a daily cycle in the following sequence: 12h light: 12h dark alternating hourly with light gradient, 12h light: 12h dark, 1h light: 1h dark and 12h dark: 12h light. Under two constant illuminations, the mating scored less than under the previous conditions, except under 12h light. Under darkeness the mating count was lower than light conditions. There was no way to differentiate the night and day rhythms of mating on different days in each regime, except for mating under 12h light: 12 dark alternating with light gradient, constant dark and 12h dark: 12h light conditions. Mating increased in certain light and temperature conditions, in wich the intensities, should have an optimum value.
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    Use of Daphnia spinulata Birabén, 1917 (Crustacea, Cladocera) in the aquarium trade : a potential risk of a new bioinvasion into Brazilian continental waters.
    (2010) Sant'Anna, Eneida Maria Eskinazi; Souza, Mauro Schettino de; Menéndez, Rosa Maria; Guimarães, Alice de Souza; Barbosa, Paulina Maria Maia
    Nesta nota, nós registramos a presença de uma espécie exótica de cladócero, Daphnia spinulata, utilizada como alimento vivo no comércio de aquariofilia nos Estados de Minas Gerais e São Paulo. A ocorrência desta espécie de cladócero nesta atividade comercial pode representar um risco em potencial para uma nova bioinvasão em águas continentais brasileiras. A identificação das possíveis rotas de invasão biológica é de fundamental importância para prevenir e controlar futuras invasões, além de antecipar e conter uma possível dispersão desta espécie exótica.