Thorn-scrub vegetation community


Also known as Sinaloan thorn-scrub, this community covers large areas in central, southern, and eastern Sonora. It picks up from west to east where the Sonoran Desert gives out in the Sonoran Sky Island and Sierra Madre foothills and valleys. Sometimes Sonoran Desert in canyons and slopes can begin to resemble thorn-scrub in structure. There are many places where one gradates into another in structure as well as species composition.

Oasis at the Desert Edge: Flora of Cañón del Nacapule, Sonora, Mexico

Cañón del Nacapule cuts into the southeastern flank of the Sierra El Aguaje, a rugged volcanic range about 20 kilometers northwest of Guaymas. Nacapule is included in the Sonoran segment of the Gulf Coast subdivision of the Sonoran Desert. The bi-seasonal (summer and winter) rainfall is highly variable. Many plants of tropical origin reach their northern limits in this region or do not extend farther north in the arid coastal desert of western Sonora.

Protecting El Pitayal

This presentation is meant to stimulate action by informing others of the nature of our goals and the urgency of the need for persons with the expertise in real estate law and land acquisition to engage our problem.

For the last 12 years, the Alamos Wildlands Alliance, a non-profit conservation group, has been operating a biological field station in the southwest corner of Sonora, a long day’s drive from Tucson. From mid-November through March, we teach and study the flora and fauna of this diverse landscape on the shores of the Agiabampo Estuary.

Twelve Days From the Rio Tutuaca

Confluence of Rio Tutuaca and Sirupa, begin Rio Aros

By Huck

Recently I had the opportunity to see, by raft, the country I've been tramping overland for the last couple of decades. Just getting to the put-in of our trip was a logistical conundrum and an exercise in patience. We needed a shuttle driver who was comfortable in the fringe area of Copper Canyon, Chihuahua, and the driver might have to spend two, maybe three nights on the road before getting home. Then he would have to pick us up in 10 or 11 or 12 days; and who knew for sure. This trip is best attempted when the water has a good flow, but unbeknownst to us, a tropical hurricane (Norbert) was heading for the sierras preparing to drop 3 days of solid rain in the drainages that fed our rivers. We recently had some decent enough flows from summer monsoons after a prolonged dry spell to even attempt this project. As it turned out, it rained all night and part of the second day as we headed deeper into Chihuahua from the take-out point near Sahuaripa, Sonora. The side canyons in the cordillera of the sierras were roaring with brown water--not a good sign. The next day we contemplated a delay, but a promising sucker hole of robin egg blue sky beckoned us further as we polished off breakfast of strong coffee, papaya and granola bars. We left the highway on a broad sinuous dirt road for the last 100 kilometers, a four hour drive to a rickety logging bridge halfway between Yepachic and Madera. (Photo gallery from trip)


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