Volume 93, Issue 2
March 1984, pages 77-158
pp 77-82 March 1984
The rhizosphere effect ofAndropogon pumilus Roxb. on soil nematodes, percent organic matter and percent total nitrogen has been studied and compared with nonrhizosphere soils. The proportion of plant parasites and microbivores were considerably higher than the proportion of miscellaneous feeders and predators in the rhizosphere than in the root free soils. Nematode population in the rhizosphere reached a peak during the flowering stage in November. Nematode density, percent organic matter and percent total nitrogen were significantly more in the rhizosphere soil than the root free soil. In the rhizosphere soil nematode abundance showed a significant positive correlation with percent organic matter and percent total nitrogen indicating that the root exudates promote increase in the population of micro-organisms and nematodes.
pp 83-89 March 1984
Four rhesus groups, two forest and two urban, were observed to collect data on cooperative attack, cooperative defence and assuaging behaviour. Adult females were prominent as help giver in forest as well as urban area; however, cooperative attack was more among the latter. During cooperative defence, females tried to escape from attacks of males with the cooperation of males and females. This pattern was common in urban and forest monkeys, in both areas, females assuage infants when they sought contact, needed reassurance or were threatened.
pp 91-95 March 1984
Histoenzymological differences in the localization and intensities of succinate and lactate dehydrogenases, tetrazolium reductases and steroid dehydrogenases have been studied in the follicular envelope of white and stages of yellow follicles of the crow ovary. The activities of these enzymes in the thecal gland cells show a progressive increase during follicular growth. The granulosa layer of white follicle is devoid of Δ5-3β-hydroxysteroid dehydrogenase which appear and show a gradual increase in the rapidly growing yellow follicles along with other enzymes.
pp 97-106 March 1984
The fish matured only after attaining an average length of 700 to 770 mm. The period between July to September was established to be its spawning season. Observations on the Gonado-Somatic Index (GSI) and relative condition factor confirmed this observation. The variation in the sex-ratio during the spawning season was considered to be a remarkable adaptation towards low fecundity. The paper also comments on the problems of the Garhwal Himalayan mahseer and precautionary methods awaiting implementation in this region.
pp 107-114 March 1984
A survey was conducted on the incidence of diseases, by superficial appearance, in common fish species of Portonovo coast. Approximately 46,484 marine and 22,150 estuarine fishes were examined. Marine fishes alone were observed with fin rot and neoplasm while estuarine fishes were free from such abnormalities. Fin rot was recorded among seventeen species of marine fish and tumour in cat fish. Fin necrosis accompanied with haemorrhage, ulceration and loss of scales was consistent external sign of the disease. Species of cat fish, grunter, queen fish and pikes were mostly affected by fin rot at high level and the maximum peak was recorded in April. Cat fishes alone had tumour. More than 80% of the tumour bearing specimen had fin necrosis.
pp 115-119 March 1984
LDH activity decreased in the osmoregulatory organs and increased in the non-osmoregulatory organs from the small and large individuals ofS. mossambicus on adaptation to both cold and warm temperatures, relative to normals at room temperature. In any size group, the activity was generally higher in the brain and white muscle, lower in the gill and intermediate in the liver, red muscle, kidney and intestine. The enzyme activity was size-dependent, irrespective of adaptation temperature it was higher in the organs from the large individuals than in those from the small ones. However, the variations in the % LDH activity in the organs between the small and large individuals were very slight in magnitude and inconsistent in direction. The metabolic efficiency to adapt to thermal stress decreases with size.
pp 121-129 March 1984
The effect of hashish plus cigarette smoke on normal rats and rats undergoing psychological trauma was studied.
pp 131-139 March 1984
A population of the Western Ghats squirrel,Funamhulus tristriatus Waterhouse, was studied for some group attributes. The density ranged between 2 and 4 individuals/ha, the pattern being irregular. The rate of persistence was very low and nearly 83 % of the squirrels marked and released disappeared from the population within 12 months. The sex ratio significantly favoured males. Males were heavier than females, but the difference was not statistically significant.
pp 141-158 March 1984