NUTRITIONAL BUDGET FOR THE FRESHWATER SNAIL BITHYNIA GRAECA (GASTROPODA: BITHYNIIDAE)
| Autor: | M. Lazaridou-Dimitriadou, N. Eleutheriadis |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Journal of Molluscan Studies. 62:177-184 |
| ISSN: | 1464-3766 0260-1230 |
| DOI: | 10.1093/mollus/62.2.177 |
| Popis: | The nutritional budget of Buhynia graeca (Westerlund) was studied using samples of a snail population of Lake Kerkini (N Greece). A laboratory investigation of food consumption and assimilation in B. graeca was undertaken using Aufwuchs as food. On the basis of this investigation estimates of natural consumption and assimilation efficiencies were made. Reference is made to the energy (in terms of organic carbon content) invested in egg production. The highest daily rates of consumption, faecal production and assimilation were observed in newly hatched snails and the lowest rates in mature snails. The same pattern of mean ingestion and assimilation rates of organic carbon (both protein and non protein) and of nitrogen, was observed in both sexes. It was assumed that this snail feeds exclusively on the Aufwuchs, which was abundant in the study area, and estimates of annual consumption and annual faecal production (per m2) in the field were derived Accordingly, the annual consumption rates were 218 9 g dry weight of Aufwuchslm2 in females, and 227.7 g in males; similarly, the annual rates of faecal production were 101.8 g dry wt/m2 in females and 99 2 g/m2 in males The assimilation efficiency for all size classes was found to be 53 5% in females and 56.4% in males. |
| Databáze: | OpenAIRE |
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