RESUMENEl lago de Zirahuén se localiza en la porción centro-norte del estado de Michoacán, dentro de la región hidrológica de la cuenca del Balsas, a 2075 m s.n.m. Es un lago monomíctico, oligotrófico, de tipo endorréico y posee una profundidad máxima de 43 m. Se describe la flora y la vegetación acuáticas del lago, representada por 35 familias, 55 géneros y 93 especies, de las cuales 27 son tolerantes, 42 subacuáticas y 24 acuáticas estrictas. Las formas de vida corresponden a los tipos de enraizadas emergentes, enraizadas sumergidas, enraizadas de hojas flotantes y libremente sumergidas. La vegetación se encuentra distribuida a lo largo de la línea de costa, presentándose a partir de las zonas de inundación temporal y en algunos casos hasta los 12 m de profundidad a manera de individuos aislados. Actualmente la cuenca y el lago muestran signos de deterioro, ocasionados por la explotación irracional de sus recursos, por lo que es urgente tomar las medidas necesarias a corto, mediano y largo plazo, para su conservación.Palabras clave: distribución de hidrófitas, flora y vegetación acuática, Zirahuén. ABSTRACT Lake Zirahuen is located in the north central area of Michoacan state, within the hydrological region of the Balsas basin, at 2075 m above sea level. The lake is monomictic, oligotrophic, endorreic and has a maximum depth of 43 m. The flora and the aquatic vegetation are described. Of the 93 species (55 genera, 35 families) that occur, 27 are tolerant, 42 subaquatic and 24 are strictly aquatic. Plant communities are comprised of hydrophytes that are attached emergent, attached submerged, floating leaved and free submerged. The aquatic vegetation is distributed along the lake shore, extending from the regions of temporary flooding to areas of open water 12 m deep. At present both, the Acta Botanica Mexicana 68: 1-38 (2004) 2 catchment basin and the lake itself are showing signs of ecological degradation due to the intensive exploitation of its resources. Both short and long-term strategies need to be developed to stem further degradation of the lake.
Population size and behavior pattern of Grus canadensis (Aves: Gruidae) in two localities of Cuba. The availability of information on species abundance in the Neotropic is insufficient, and this prevents the execution of precise analysis and the definition of adequate conservation strategies for endemic and threatened species. This study aimed to analyze the population size of the endemic and threatened subspecies Grus canadensis nesiotes. For this, a simultaneous census was undertaken in 24 count stations in Isla de la Juventud (IJ) and 32 stations in Ciego de Ávila (CA), Cuba, during two consecutive days between 2008 and 2010. Abundance and behavior pattern (instantaneous method) were analyzed by habitat type, to help understand how cranes modify their behavioral pattern when the natural habitat is changed. Flocks in IJ had three individuals,
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