• V Uma Devi

      Articles written in Proceedings – Animal Sciences

    • Aquatic and aerial respiration of an intertidal tropical gastropodMorula granulate (Duclos) in relation to temperature

      V Uma Devi Y Prabhakara Rao D G V Prasada Rao

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      The rates of aquatic and aerial oxygen consumption of an intertidal tropical gastropodMorula granulate increases with increasing temperature. The temperature at which the breakdown occurred in their oxygen consumption was observed to be different, 45°C for aquatic and 42°C for aerial respiration. However, the aquatic rates of oxygen consumption were higher than the aerial rates at all temperatures studied. The aquatic and aerial Q10 values showed almost the same trend, higher at lower temperatures and vice versa. The results were discussed in relation to the habitat of the animal.

    • Starvation as a stress factor influencing the metabolism of a tropical intertidal gastropodMorula granulata (Duclos)

      V Uma Devi Y Prabhakara Rao D G V Prasada Rao

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      The snailMorula granulata (Duclos) survived the starvation stress over a period of 30 days but 50% mortality occurred on the 70th day. The changes in the level and content of different biochemical constituents viz carbohydrates, glycogen, free sugars, protein, total ninhydrin positive substances and lipids were investigated in foot, gonad digestive gland complex and viscera of the animal at intervals of 10 days up to 70 days. All these biochemical constituents (both level and content) were found to decrease with the period of starvation showing their utilisation except total ninhydrin positive substances which exhibited an increase. Of all the 3 tissues, the gonad digestive gland complex was affected most during starvation. ‘Lipid-oriented’ metabolism was observed in this animal showing maximum utilisation of lipids during starvation. Respiratory studies revealed a decreased pattern of oxygen consumption with increasing period of starvation when calculated per snail or per tissue weight. The recalculated intercept values (a) also showed a decreasing trend when exposed to starvation.

    • Seasonal changes in the level and content of different biochemical constituents in tropical cerithiidsCerithidea (Cerithideopsilla) cingulata (Gmelin 1790) andCerithium coralium Kiener 1841

      Y Prabhakara Rao V Uma Devi D G V Prasada Rao

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      The level and content of different biochemical constituents were investigated over a period of one year (January–December 1982) in foot, gonad digestive gland complex and viscera of two tropical cerithiids, inhabiting two different regions of backwaters. Their seasonal indices exhibited bimodal pattern of cycling and this trend was more predominant in gonad digestive gland complex and foot. In all the body components of both species, the biochemical content was found to show considerable changes when compared to their levels. In both the cerithiids, the gonad digestive gland depicted remarkable variations with the season, followed by foot. The viscera did not show much variation when compared to other body components. The carbohydrates and glycogen of both the species showed a primary peak in March and a secondary peak in September indicating maturity of gonads. This was followed by a decline in their constituents which might be due to spawning. Lipid utilisation was also observed in both the animals next to carbohydrates and glycogen. Proteins were least utilised in the process of reproduction. Thus a carbohydrate-oriented metabolism was recorded in both the species. The results were compared with the other molluscs.

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