Journal Title
Title of Journal: Aquat Ecol
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Abbravation: Aquatic Ecology
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Publisher
Springer Netherlands
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Authors: Esteban Balseiro Beatriz Modenutti Claudia Queimaliños Mariana Reissig
Publish Date: 2007/07/03
Volume: 41, Issue: 4, Pages: 599-609
Abstract
Food quality in terms of carbon Cphosphorus P ratio can constrain the success of highly demanding P herbivores as Daphnia North Andean Patagonian lakes are ultraoligotrophic with low nutrient concentrations and welldeveloped euphotic zones We investigated the distribution of the large Daphnia commutata in relation with food quality sestonic CP ratio and predation risk in these lakes The predation risk was estimated based on the fish species present and their relative eye diameter and transparency of the lake The CP ratios in the lakes were high varying from 350 to 1200 The lakes with D commutata had significantly lower CP ratio than those without these daphnids On the other hand those lakes where Daphnia is present have the lower predation risk than those were Daphnia is absent In addition we carried out growth experiments with neonates and natural seston of three lakes with different CP ratio The growth rates were inversely related with CP of the food Food quality and predation risk together determined the success or failure of large Daphnia populations in these Andean clear ultraoligotrophic lakesTo Dr Roberto Bertoni from ISE Pallanza Italy for laboratory facilities and the use of the Carlo Erba Carbon Analyzer To Dr V Cussac for helpful discussion on distribution and visual acuity of autochthonous fish All authors are CONICET Researchers This work was supported by grants from CONICET PIP 6507 FONCyT PICT 0113395 PME033 and UNC B119
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