Grazing
Population Status Of Jaguars (Panthera Onca) And Pumas (Puma Concolor) In Northeastern Sonora, Mexico, Rosas and Bender
Jaguars are endangered in Mexico and the United States, necessitating careful monitor- ing of population status. We determined minimum numbers of jaguars and sympatric pumas in a small population in northern Sonora, Mexico, the nearest known breeding population to the United States, by photographic captures supplemented by idiosyncratic features of tracks from track surveys (1999-2005). We also developed a discriminant function to differentiate species (jaguar v. puma) and sexes within species, which also aided in individual identification.
Tropical Deciduous Forest cleared for cattle
TDF and thorn-scrub are often cleared to make way for planting of non-native buffelgrass (Pennisetum ciliare) for cattle forage. Calumnar cactus are often left, but do not always survive. Generally there will not be recovery to TDF. Sometimes a monoculture of Acacia cochliacantha can eventually invade cleared areas if it can outcompete beffelgrass and the area isn't burned or re-cleared.
Mountain lion heads piled up
This horrible photo of the killing of mountain lions in the name of protecting livestock is a reminder of the gruesome nature of the business.
The Quitobaquito Desert Pupfish
An Endangered Species within Organ Pipe Cactus National Monument: Historical Significance and Management Challenges
Rio Sonoyta
The Rio Sonoyta, despite grazing across the watershed, agriculture, groundwater pumping, and the incredible dry nature of the region, still has perennial flow in stretches west of the town of Sonoyta.