Ecological studies of some aquatic phycomycetes

Distribution and seasonal periodicity of water molds in some lakes in Naini Tal Hills, India

“…The results obtained in the present study in subtropical lakes are in agreement with those obtained by Dayal & Tandon (1962) and , who showed that maximum numbers of water molds occur at 18-2o°C and minimum numbers at higher temperatures (25 -30 0 C) . Forbes (1935) & Waterhouse (1942, working in temperate waters without mentioning the temperature range, noted that maximum yield of water molds was obtained during winter (December-February) and minimum in summer (May-June) .…”

“…Winter temperature (average 18°C) reported in the subtropical region (Dayal & Tandon, 1962) is nearly the same (11-i9°C) as that reported during summer of the temperate region (Perrot, 1960) . Therefore a comparison based on seasons is not likely to give a true picture.…”

“…Chaudhuri et al . (1947), Naumov (1954, Perrott (1960) and Dick and Newby (1961) have also indicated two maxima, one in spring and the other in autumn, while Dayal & Tandon (1962) and reported one maximum in winter only . Milovtsova (1935) observed maximum appearance in the months of June and July while Roberts (1963) found maximum fungi in spring .…”

“…Later Forbes (1935), Waterhouse (1942), Dayal and Tandon (1962) and working in widely different locations (former two being from U .K . and the latter two from plains in India) have reported that winter is the most suitable period for the growth of watermolds, while Chaudhuri et al .…”

Seasonal periodicity of aquatic fungi in tanks at Kurukshetra, India

“…Coker (1923) first pointed out that for the great majority of Saprolegniaceae, spring is the most favourable season for growth and seasonal variation in abundance. Later, Forbes (1935), Waterhouse (1942), Dayal & Tandon (1962, 1963, Srivastava (1967), Khulbe & Bhargava (1977), Manoharachary & Ramarao (1981) and Misra (1982Misra ( , 1983, working in widely different locations, reported that winter is the most suitable period for growth of aquatic fungi, while Chaudhuri et al (1947), Naumov (1954), Perrot (1960) and Dick & Newby (1961) observed two maxima, one in early spring and one in late autumn. Roberts (1963), likewise, recorded low numbers during warm season, while in autumn, species began to build up and reached a maximum in spring.…”