• A A Karande

      Articles written in Proceedings – Animal Sciences

    • The nauplii ofBalanus kondakovi

      A A Karande

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      Six naupliar stages ofBalanus kondakovi were raised under laboratory conditions on a diet ofDunaliella primolecta. The nauplii of this species are generally small, with carapace, caudal spine, abdominal spine and labrum, lacking any special feature that could help in specific identification. However, these features when considered in conjunction with the limb setation help to separate these larvae from those of the others. It is one of the fast metamorphosing barnacle larvae attaining metanauplius stage in about 80 hr.

    • Overgrowth competitions amongst encrusting cheilostomes

      A A Karande B S Swami

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      The overgrowth interactions and spatial relationships amongst 7 interacting bryozoan species in the coastal waters of Bombay were studied. All interspecific encounters involved overgrowth, there being a total absence of ties. On the other hand, in intraspecific encounters, occurrence of ties was quite high. It was observed that a superior overgrowth of any species did not determine its relative abundance. None of the 7 species studied won in all its overgrowth interactions with the others. It was further observed that the success of cheilostome species to dominate over the others did not depend on their ability to grow over through any one particular encounter angle. Ranking of competitive overgrowth abilities amongst the 7 species studied did not form a simple hierarchial sequence but instead formed a competitive network.

    • Byssal threads ofMytilopsis sallei (Recluz) and their adhesive strength

      M Udhayakumar A A Karande

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      The dreissenid musselMytilopsis sallei (Recluz) settles on man made structures in confined harbour waters. The mussel unlike some mytilids is never found to have settled on coastal sea bed. It shows a good capacity to produce a byssus apparatus and develops a new one every time it settles afresh. Younger mussels develop byssus apparatus at shorter intervals and therefore move more often. Adults are relatively passive. Byssal thread development is influenced by the environmental factors and also by the quality of surface. The mussel achieves better adhesion on polar surfaces like slate and glass than on teflon. Tensile strength of adhesive threads is very poor as compared to other mytilids. This possibly is one of the reasons for its absence on sea beds where sea water turbulence is very high.

    • Shell structure and shell strength in Cirripedes

      A A Karande M Udhayakumar

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      Compressive and adhesive strengths of 7 barnacles endemic to Bombay shore were ascertained by using Instron universal testing machine. The adhesive strengths of balanid species settled on man-made materials like bakelite, asbestos, perspex, rubber, glass and teflon were determined. The adhesion on teflon was found to be the poorest. Comments are made on the compressive strengths of barnacles and their shell macrostructures. A need for the adoption of uniform method of the preparation of shell samples as well as of instrumental technique has been suggested for computing fresh data for the representative species.

    • Biofilm characteristics in coastal waters of Bombay

      R B Srivastava S N Gaonkar A A Karande

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      Field and laboratory studies were carried out to analyse the development of biofilms generated on various metallic and non-metallic coupons immersed in coastal waters of Bombay. It is observed that the nature of the biofilm formed not only varies from substratum to substratum but is also influenced by the quality of water, flow conditions and the biotic status of the seawater. The biofilms depending upon the degree of entrapment of the inorganic detritus have varying weights. The biofilms formed on metallic surfaces when compared with perspex surface, are both qualitatively and quantitatively richer. Cupro-nickel, despite its toxicity, supports denser film than the one developed on inert perspex surface. The metallic coupons, both inert and toxic, support thicker films in polluted waters than in clean waters.

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