Observations on cohorts of Tubifex tubifex cultured at different food levels,using cellulose substrate |
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Authors: | Andrea Pasteris Carla Bonacina Giuliano Bonomi |
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Institution: | (1) Dipartimento di Biologia Evoluzionistica Sperimentale, Università degli Studi di Bologna, Via S. Giacomo 9, I-40126 Bologna, Italy;(2) CNR - Istituto Italiano di Idrobiologia, Largo Tonolli 50, I 28048 Pallanza, Italy |
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Abstract: | In order to clarify the relationship between food availability and population dynamics in aquatic oligochaetes, short term cultures and cohort cultures of Tubifex tubifex were reared using substrates with different food concentrations, obtained by mixing sand with different amounts of cellulose powder.In short term experiments, T. tubifex seemed capable of utilizing cellulose substrates for growth or egg production. Yet, in the cohort experiment, newly hatched worms could not grow on cellulose substrates. Survivorship, however, appears to be influenced by cellulose concentration giving an indication that this material, although inadequate, is somehow utilized. |
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Keywords: | Oligochaeta Tubifex tubifex cohort cultures population dynamics food availability cellulose |
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