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标题：Distribution, diversity and ecology of modern freshwater ostracodes (Crustacea), and hydrochemical characteristics of Lago Petén Itzá, Guatemala
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作者：Liseth PÉREZ ; Julia LORENSCHAT ; Rita BUGJA 等
期刊名称：Journal of limnology
印刷版ISSN：1129-5767
电子版ISSN：1723-8633
出版年度：2010
卷号：69
期号：1
页码：146-159
DOI：10.4081/jlimnol.2010.146
出版社：Istituto italiano di idrobiologia
摘要：We analyzed modern ostracode species assemblages and water column physico-chemical characteristics in Lago Péten Itzá, Guatemala.Lake waters are dominated by sulfate, bicarbonate, calcium and magnesium and display a total ion concentration of ~11 meq L-1.Eleven extant ostracode species were identified.We found higher abundances of living ostracodes, as well as relatively higher species richness (eight species) and biodiversity (H of 1.6) between the littoral zone and a water depth of 20 m.At water depths >40 m, these variables all decreased.The thermocline is located at a water depth of ~20-40 m.Cluster analysis revealed three water depth ranges in the lake of importance to ostracode distribution: 1) littoral zone (0.1-3 m), 2) water depths from the base of the littoral zone to the base of the thermocline (3-40 m), and 3) water depths below the thermocline (40-160 m).The assemblage "Darwinula-Heterocypris-Pseudocandona-Strandesia" is characteristic of waters <15 m.The "Cypridopsis-Cytheridella-Limnocythere" assemblage characterizes waters 40 m.Ostracode taxa from Lago Petén Itzá show specific ecological preferences related to water depth and associated physico-chemical characteristics, thus illustrating the potential of ostracodes as indicators of lake level changes and hydrodynamics.
关键词：freshwater ostracodes; ecology; Lago Petén Itzá; Guatemala; hydrochemistry; water depth