Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Liseth Pérez,Socorro Lozano-García,Margarita Caballero

doi:10.15517/rbt.v63i2.15240

Liseth Pérez, Socorro Lozano-García + Show 1 more

Open Access

https://doi.org/10.15517/rbt.v63i2.15240

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Abstract

The ostracode fauna of the neartic-neotropical transitional zone has remained poorly known until this study. Ten ostracode species inhabit ten highland lakes (five maar lakes (phreatic/phreato-magmatic explosion origin), one volcanic-tectonic lake, three natural dams and one man-made dam) in East-central Mexico. Surface sediments from the deepest part and the littoral zone from all studied lakes were collected. Environmental variables (pH, temperature, dissolved oxygen, conductivity, TDS) were measured in situ and parallel water samples for chemical analysis were collected for habitat description. Widely distributed species in the study area (≥5 lakes) include Cypridopsis vidua, Darwinula stevensoni and Eucandona cf. patzcuaro. Limnocytherina axalapasco is an endemic species and was collected in three maar lakes and in one man-made dam. Rare species included: Chlamydotheca arcuata?, Fabaeformiscandona acuminata?, Ilyocypris gibba?, Limnocythere friabilis?, Potamocypris smaragdina? and Potamocypris unicaudata?. Highest species richness (6 spp.) was found in the large and shallow Lake Metztitlán (2.6km2, 5.5m deep), with the lake water type HCO3-&gt;&gt;SO42-&gt;Cl- -- Ca2+&gt;Na+&gt;Mg2+. The rest of studied lakes (&lt;63m, &lt;27km2) had not more than three species. For instance, only two ostracode species were collected in Lake Alchichica, which is the largest, deepest and most saline studied maar lake.

Highlights

Microcrustaceans are dominant zooplankters in aquatic ecosystems, and are key components of the food web (Dole-Olivier, Galassi, Marmonier, & Creuzé des Chattelliers, 2000; Cohen, 2003)
Central Mexico is an interesting area for ostracode studies because it is a transitional zone between the Nearctic and the Neotropic
This study reveals whether ostracode species living in these highland lakes have a Nearctic and/or Neotropical distribution and if endemic species exist

Summary

Introduction

Microcrustaceans (ostracodes, cladocerans and copepods) are dominant zooplankters in aquatic ecosystems, and are key components of the food web (Dole-Olivier, Galassi, Marmonier, & Creuzé des Chattelliers, 2000; Cohen, 2003). Peninsula and surrounding areas (Guatemala and Belize) are well known (Lorenschat, 2009; Pérez et al, 2012, 2013) Because of their great importance as proxies of environmental and climatic change, ostracodes in Central Mexico have been used in paleolimnological studies, mostly in the Pátzcuaro Basin (Forester, 1985; Bridgwater, Heaton, & O’Hara, 1999a; Bridgwater, Holmes, & O’Hara, 1999b; Metcalfe et al, 2007), and in the crater lake Santa María del Oro, Western Mexico (Vázquez, Ortega, Rodriguez, Caballero, & Lozano, 2008). The main objective of this study was to provide a short morphological and habitat description, and a compilation of the ecological preferences and distribution for the ostracode fauna that inhabit lakes in East-central Mexico This is a region where paleolimnological studies have been conducted, and this study will improve environmental and climatic inferences based on ostracodes

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