influence of substrate humidity on desiccation resistance capacity in subulina octona (mollusca, subulinidae)

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ID: 245052
2007
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Abstract
The aim of this study was to verify the influence of substrate humidity on desiccation resistance of Subulina octona, continuously exposed, for 48 h, to the temperature of 35 °C. Forty individuals conditioned in 2 plastic boxes, one box containing black earth humidified with 40 ml water and the other one containing dry black earth were used. The retraction of cephalopodal mass inside the shell and the number of dead individuals was evaluated. Snails from dry and humid substrate boxes showed cephalopodal mass retraction of 9.9 cm±2.88 and 2.78 cm±3.17, respectively, after 12 h of exposure; 8.55 cm±1.3 and 6.33 cm±2.91, after 24 h; 11.07 cm±4.19 and 7.27 cm±2.7, after 36 h, 9.12 cm±2.15 and 6.47 cm±2.11, after 48 h. Every individual of dry substrate box died whereas every individual of humid substrate box survived. These results showed that substrate humidity was an influent factor regarding desiccation resistance in S. octona.
O objetivo deste trabalho foi verificar a influência da umidade do substrato sobre a resistência à dessecação em indivíduos da espécie S. octona, submetidos a uma exposição contínua, por 48 horas, à temperatura de 35 ºC. Foram utilizados 40 indivíduos, acondicionados em dois potes plásticos, um pote contendo terra vegetal® umedecida com 40ml de água e outro contendo terra vegetal seca, mantidos em câmara climatizada a 35±1 ºC. Foram verificados, a retração da massa cefalopodal no interior da concha e o número de indivíduos mortos. Os moluscos do pote com substrato seco e do pote com substrato úmido apresentaram retração da massa cefalopodal de 9,9cm±2,88 e 2,78cm±3,17 respectivamente, após 12 horas de exposição; 8,55cm±1,3 e 6,33cm±2,91, após 24 horas; 11,7cm±4,19 e 7,27cm±2,7, após 36 horas e 9,12cm±2,15 e 6,47cm±2,11, após 48 horas. Todos os indivíduos do pote com substrato seco morreram, enquanto todos os indivíduos do pote com substrato úmido sobreviveram. Esses resultados demonstram que a umidade do substrato é um fator que influencia a resistência à dessecação em S. octona.
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Authors ;Roberto Júnio Pedroso Dias;Elisabeth Cristina de Almeida Bessa;Sthefane D'Ávila
Journal current drug delivery
Year 2007
DOI
10.1590/S1516-89132007000100016
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100016
Keywords
substrate desiccation humiditybiotechnology

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