Summary of Abstract Submission

Abstract Submission No. IO50-09-0057PresentationPoster

PUMPING RATE OF THE SPONGE CINACYRELLA CAVERNOSA WITH REFERENCE TO THE INDIVIDUAL SIZE AND DIURNAL VARIATION

Azraj Dahihande 1, Narsinh L. Thakur**1

1 CSIR-National Institute of Oceanography, India

ABSTRACT :

Sponges are sessile, filter feeding organisms that play crucial role in element cycling and bentho-pelagic coupling. Sponges don¿t maintain their natural pumping rate under laboratory conditions; hence in-situ measurements provide more accurate information. In the present investigation, pumping rate of the sponge Cinacyrella cavernosa was quantified using a dye-videography technique, in the intertidal rock pools. Sponges were segregated in three different size classes like small (<5 cc), medium (5-34 cc) and large (>34 cc). Pumping rate of different sized individuals was measured diurnally. The pumping rate per unit volume was highest in large sponges (2.47 ml/sec) followed by medium (0.87 ml/sec) and small (0.16 ml/sec) respectively. It was observed that the pumping rate increases according to the sponge size due to the increase in the number of oscula and number of choanocyte chambers. Pumping rate of the sponge was found to be influenced by the diurnal variations.