At the Northwest coast of Mexico the severely limited freshwater supply, and the geographic isolation determines the scarcity of productive activities. Specially at Baja California Sur. Aquaculture is a major productive alternative for the economic development of this State. Despite the aridity, the natural vegetation of Baja California Sur is diverse and structurally complex with a high percen...

It has been suggested that there is a geographic dichotomy in the pollination systems of chiropterophilous columnar cacti: in intra-tropical areas they are pollinated almost exclusively by bats, whereas in extratropical areas they are pollinated by bats, birds and bees. However, currently the studies are clumped both taxonomically (mainly Pachycereeae species) and geographically (mainly in the ...

Contours, the connected components of level sets, play an important role in understanding the global structure of a scalar field. In particular their nesting behavior and topology—often represented in form of a contour tree—have been used extensively for visualization and analysis. However, traditional contour trees only encode structural properties like number of contours or the nesting of con...