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

Abstract

The distribution of 26 species of Blastocladiales, Saprolegniales, Lagenidiales and Peronosporales from temperate and sub tropical lakes, situated at different altitude in the same locality, is described . Seasonal periodicity is treated and found to be governed by temperature .

Occurrence, distribution and seasonality of aquatic fungi as affected by chemical factors in six alkaline ponds of Indi*

“…This agrees with earlier reports (Dayal& Tandon 1963 ;Srivastava 1967 ;Khulbe& Bhargava 1977) . As is evident from Table 6, the frequency percentage of the occurrence of these fungi shows negative and highly significant correlation with the water temperature .…”

Seasonal periodicity of aquatic fungi in tanks at Kurukshetra, India

“…The fact that the temperature plays an important role in the occurrence, activity and morphology of aquatic fungi has been emphasized by many aquatic mycologists from different parts of the world (Lund, 1934;Perrott, 1960;Suzuki, 1960a, b;Dayal & Tandon, 1962;Roberts, 1963;Srivastava, 1967;Alabi, 1971a, b;Khulbe & Bhargava, 1977). In the present study, it was found that the fungal occurrence was temperature dependent and it fluctuated with the variation in temperature.…”

“…Alabi (1971 la), in his studies on seasonal periodicity of Saprolegniaceae at Nigeria, has classified them into 'all season', 'dry season' and 'rainy season' species. However, Khulbe & Bhargava (1977) used a wider classification. They divided aquatic fungi of Nainital region into four categories viz., constant species (from 10.0-28.5 °C), low temperature species (from 10.0-20.0 °C), moderate temperature species (from 15.0-23.5 °C) and high temperature species (from 15.0-28.5 C).…”

“…The periodicity of the first group was reported to be associated with temperature, whereas in the eccentric-oospored group, the effect of temperature was negligible. Alabi (1971a) and Khulbe & Bhargava (1977) also observed that eccentric species were found mainly during dry seasons (high temperatures) while centric and subcentric species occurred during rainy seasons (low temperature).…”

“…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.…”