• Volume 79, Issue 1

      January 1974,   pages  1-51

    • Influence of thermal acclimation on oxygen consumption in the agamid garden lizard,Calotes nemoricola jerdon, with reference to size, sex, temperature, season and climatic conditions

      M V Subba Rao B S Rajabai

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      1. Oxygen consumption of the tropical agamid species of lizard,Calotes nemoricola was measured at 15, 20, 25, 30, 35 and 40° C using different sized animals in Warburg’s respirometer. It was found that the metabolism increases with weight and temperature but the rate of increase was different at different temperatures.

      2. Studies on the effect of temperature on the cold and warm acclimated lizards revealed that not only oxygen consumption, but temperature response relationships were also influenced by thermal acclimation, thus resulting in the reverse translation (II B) of the R-T curves of acclimated lizards. It was noticed that acclimation by translation was common and the type of acclimation is dependent on the size of the lizard also. Therefore, there was no acclimation in both the sexes of lizards.

      3. Weight-regression coefficients (b) in general increased with temperature inC. nemoricola except in few cases. It indicated that there was no pattern of (b) values in this species.

      4. R-T curves illustrate that the respiratory activity in the cold and warm smaller lizards of both sexes was significantly higher than that of the larger lizards.

      5. Q10 values were calculated at 15–20, 20–25, 25–30, 30–35 and 35–40° C in both sexes and season inC. nemoricola. Comparatively, in majority of the cases, the Q10 in males and females of summer populations were greater than in the winter populations.

    • Observations on the growth rate inMartesia striata (Linn.), the wood-boring pholad in the cochin harbour region on the south-west coast of India

      P V Cheriyan C J Cherian

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      Experimental studies conducted in Cochin harbour during 1967 to 1969 have shown thatMartesia striata settled on timber test panels during the months December to May when the salinity of water varied from 28·2‰ to 34·0‰ and temperature from 29·4° C to 32·5° C. The maximum size of the animals in one month old panels varied from 2·0 mm to 6·0 mm. The rate of growth in the second, third and fourth months varied from 6·0 mm to 16·0 mm; 4·0 mm to 19·0 mm; and 1·0 mm to 7·0 mm, respectively. The average growth rates calculated for the second, third and fourth months showed that the growth was rapid in the second and third months with the maximum in the third month. No definite correlation between the rate of growth and the hydrographic conditions was perceptible. The pattern of growth in the species was found to follow Bertalanffy’s equation. The length-height relationship during the course of growth inMartesia striata showed that in early stages up to 3 mm size, the length of the animal was equal to its height and as growth progressed the rate of increase in height gradually diminished and in large specimens the height measured only about half the length of the animal.

    • Cuticular studies in some species ofHemigraphis andStrobilanthes

      Khwaja J Ahmad

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      Cuticular investigations have been carried out in three species ofHemigraphis and nine ofStrobilanthes. The two genera belonging to the family Acanthaceae are generally placed together within the same tribe by taxonomists.Hemigraphis andStrobilanthes show broadly similar epidermal characters though there are significant differences also. On the basis of the present study, the placement of these genera in two different sub-tribes but under the same tribe appears to be justified. The three species ofHemigraphis show more or less uniform epiderma1 characters butH. colorata andH. hirta are more close to each other than toH. alternata.

      The epidermal characters of the investigated species ofStrobilanthes, which fall within six of Bremekamp’s new genera do not indicate any striking dissimilarities which would help to separate them under the new genera of Bremekamp.

      The variations recorded in the epidermal characters of different species of the two genera are sufficiently pronounced, as to justify their use in making distinctions at species level.

    • The early development ofMacrophthalmus depressus Rüppell andM. travancorensis pillai (Crustacea: Brachyura)

      B S Rajabai

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      The early and late first zoeae ofMacrophthalmus depressus Rüppell andM. travancorensis Pillai of the family Ocypodidae, hatched in the University Laboratory, Waltair, have been described in detail. The differences between the first zoea larva ofM. depressus Rüppell andM. diatatus de Haan are enumerated. The early development in the speciesMacrophthalmus travancorensis Pillai has been described for the first time. The key for the species described is given. Origin of Macrophthalminae of the family Ocypodidae from the family Grapsidae has been discussed.

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