Freshwater fish's spatial patterns in isolated water springs in North-eastern Mexico.

摘要: The Media Luna lake-spring was selected as representative of all thermal or no springs in the zone Valley Rioverde, a semi-arid vegetation North-eastern Mexico. This system is inhabited by 11 fish species, which six are native. Four native species endemic to region and threatened due touristic pressure introduction exotic species. objectives were determine charac- teristics that influence spatial distribution analyze their patterns, describe relationships between different general aim establish some basis for conservation these communities habitat. Several sessions initiated 1992 through direct observation. Later, 1998 1999 five systematically seasonal sampling conducted (54 subaquatic transects/session). Finally, data updated summer 2002 winter 2006. Through analysis performed only endemics region, like Ataeniobius toweri Meek, Cualac tessellatus Miller, Cichlasoma bartoni Bean C. labridens Pellegrin, at least one life stage, showed cor- relation with habitat variables other For patterns aggregation association observed. These results show certain degree specialization microhabitat characteristics, well significant interaction they coexist. In addition, relations alien suggest an antagonist relation. Management actions focused use spring represent main threat spe- cies, followed adequate management study provides future responsible wetlands, where tourism can be combined. Rev. Biol. Trop. 58 (1): 413- 426. Epub 2010 March 01.