Volume 92, Issue 5
September 1983, pages 343-407
pp 343-350 September 1983
Thilakothrips babuli induces rosette (artichoke) galls on the axillary buds ofAcacia leucophloea. As a result of feeding by the building populations of thrips, axillary shoot meristems are destroyed, and primordial palisade tissues of the leaflets and cortical tissues of the shoot axis are transformed into nutritive cells of specialised morphology. Very similar to the galls induced by mites, midges, chalcids, and chloropids,Thilakothrips-inducedAcacia galls also have a characteristic morphology, involving the inhibition of elongation of the shoot axis and crowding of maldeveloped leaflets. While describing the cecidogenesis in relation to the biology of the gall maker, an attempt has been made to discuss the morphological convergence among shoot apex galls.
pp 351-360 September 1983
Morphometric comparison of the samples ofNemipterus japonicas populations from four different localities on the east coast of India is made. Analysis of covariance of morphometric characters reveals significance at 1% level for three characters. Character by character comparison of the means of locality-samples shows that there is clinal gradation in maxillary length (south to north) and pectoral length (north to south). The distance function (D)2 analysis shows that Kakinada is the farthest removed from other localities, and Visakhapatnam and Madras samples are nearer to each other. Paradeep sample occupied an intermediate position among the locality-samples. It is concluded that allNemipterus japonicus populations along the east coast of India are from a single genetic population, with restricted and localized movements confined to the areas where they are caught. The observed distinctness of Kakinada sample appears to be due to phenotypic variation under the influence of low salinity.
pp 361-367 September 1983
Using the bioenergetics data for the final instarAchaea Janata larva exposed to a wide range of ration levels and temperatures, a linear regression model to predict the bioenergetics components of lepidopterous larva has been developed. From the dry weight of faeces egested (F) it is possible to estimate the consumption (C), production (P) and metabolism (R). Validity of the proposed model has been tested using the data reported in literature.
pp 369-374 September 1983
Cyrtophora cicatrosa Stoliczka was reared from hatching to death at 4 different temperatures i.e. 22, 27, 32 and 37° C. A significant correlation is obtained between initial water content and hatchabiiity of the eggs. During embryonic development energy density and fat decreased but the water content increased. Fat was the main energy source for embryonic development. Of 0.34 gcal energy present in an egg, 29% is utilized on embryonic metabolism, 21% on postemergent activities.
pp 375-380 September 1983
Toxicity of inorganic mercury to the freshwater fishTilapia mossambica was demonstrated by static bioassays. Statistical analysis was used for calculating 48 hr median tolerance limit, 95% confidence limits and the slope function (S). No mortality was observed within 48 hr in mercuric chloride concentration of 0.7 mgl−1 although the swimming activity of the fish decreased and the rate of opercular movement increased significantly. Concentrations of 0.9 mgl−1 and higher proved lethal. Symptoms of mercury poisoning and safe concentrations of mercury have been discussed.
pp 381-386 September 1983
An exponential increase in oxygen consumption was observed with increase in size ofCerithidea cingulata andCerithium coralium at 25°C. Theb and (b-1 ) values were calculated for both. The aerial regression values were compared with aquatic values.
pp 387-397 September 1983
The histochemistry of secretory material in neurosecretory cells (NSC) ofSquilla holosckista has been investigated. The cells of eyestalk, thoracic ganglia and brain contain different substances with regard to reproductively active and quiescent phases. The NSC of eyestalkC andD are rich in protein, associated with sulphur containing aminoacids. TheB type of NSC of thoracic ganglia is rich in lipoprotein, whereas theC type of the brain is glycolipoprotein.
pp 399-407 September 1983
InS. Holoschista, the eyestalk is provided with four types of neurosecretory cells (NSC) while the thoracic ganglia and the brain each have three types. The activities of certain NSC types of the eyestalk (C and D), the thoracic ganglia (B) and the brain (C) show fluctuations in their secretory activity during the synchronous growth of the ovary and cement glands suggesting their involvement in the control of these organs. Eyestalk ablation experiments on the reproductively quiescent female revealed the inhibitory nature of an eyestalk hormone on the ovarian and cement glands growth. On the other hand, aqueous extract of thoracic ganglia from the mature reproductive females promoted ovarian and cement glands activities, when injected into the quiescent females. But brain extract injection failed to affect the activity of the ovary or cement glands.