D Srinivasa Rao
Articles written in Proceedings – Animal Sciences
Volume 89 Issue 5 September 1980 pp 407-414
Volume 90 Issue 3 May 1981 pp 321-331
Homogeneity and diversity of the intertidal polychaetes in the Vasishta Godavari estuary are discussed basing on the collections made at six fixed stations during October 1976 and January 1978. Matrix and rarefaction methods are adopted for arriving at homogeneity and diversity respectively. Homogeneity varied along with the salinity structure in the estuary; high percentage of affinity was observed during the recovery and summer periods while affinity was relatively low during annual freshwater flood period. The factors generally controlling the diversity and the reasons for high polychaete diversity in this estuary are discussed.
Volume 91 Issue 2 March 1982 pp 199-206
A 16 km stretch of the lower Vasishta Godavari estuary (lat. 16° 18′ N long. 81° 42′ E) was surveyed during October 1976–January 1978 to study the polychaete-sediment relationship. Mean high mid- and low water marks at six permanent stations were sampled for studying polychaete distribution as well as sediment characteristics. Sand fraction dominated stations I and II and the silt-clay per cent increased higher up the estuary. Organic matter in the estuary ranged from 0·1 to 4·2% and the amount is generally linked with the silt-clay fraction of the sediment. Depending upon their tolerance to the sediment composition polychaete species colonised different tidal levels. Carnivores were restricted to sandy substrata. For the detritus feeders, the influencing factor appears to be organic matter than the sediment composition.