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• W2163743869 endingPage "46" @default.
• W2163743869 startingPage "46" @default.
• W2163743869 abstract "Ambystoma mexicanum, a highly endangered species, is endemic to lake Xochimilco (Mexico City, Mexico) which currently is being negatively affected by the introduction of Oreochromis niloticus (Tilapia) and water pollution. During the first weeks of development, when mortality is the highest, Ambystoma mexicanumdepends on a diet of zooplankton. The aim of this study was to check whether contamination levels in lake Xochimilco influence zooplankton consumption by similar size classes of A. mexicanum and Oreochromis niloticus. In this study, we analysed changes in the functional responses and prey preference of A. mexicanum and larval Tilapia in two media, one with filtered lake Xochimilco water and another one with reconstituted water. As prey we used cladocerans (Moina macrocopa, Alona glabra, Macrothrix triserialis and Simocephalus vetulus) and ostracods (Heterocypris incongruens). Zooplankton was offered in 5 different densities, 10, 20, 40, 80, 160 ind./mL. Prey consumption by A. mexicanum varied in relation to the species offered and age of the larvae. From the first week to the eighth week prey consumption by A. mexicanum increased by 57%. Our functional response tests showed that regardless of the prey type, prey consumption by A. mexicanum was lower in the contaminated water from lake Xochimilco. Among the zooplankton offered in the contaminated environment predators preferred smaller and slower moving microcrustaceans such as Alona glabra and Heterocypris incongruens. Furthermore, O. niloticus preferred prey such as Moina macrocopa and Macrothrix triserialis in the contaminated medium and was more voracious than the axolotl. Our results indicate that both water quality of the lake and the presence of the more resistant exotic fish adversely impact the survival of this endangered amphibian." @default.
• W2163743869 created "2016-06-24" @default.
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• W2163743869 date "2013-10-21" @default.
• W2163743869 modified "2023-10-03" @default.
• W2163743869 title "Effect of water quality on the feeding ecology of axolotl Ambystoma mexicanum" @default.
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• W2163743869 doi "https://doi.org/10.4081/jlimnol.2013.e46" @default.
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