This has been suggested for the columnar cacti Carnegiea gigantea and Stenocereus thurberi (Parker, 1993; Pierson & Turner, 1998), the barrel cacti Echinocactus polycephalus, Ferocactus acanthodes, and F.
thurberi, as well as seeds of the barrel cactus Ferocactus peninsulae, germinated more rapidly and accumulated higher biomass when they were subjected to hydration-dehydration cycles.
The only available information on this subject suggests that seeds of the barrel cactus Ferocactus wislizeni may remain viable in the soil for at least 18 months; postdispersal seed predation in this species is high, although seeds may escape from predators when hidden among rocks (Bowers, 2000).
1993) reported that the number of individuals of Stenocereus thurberi and Ferocactus peninsulae was significantly higher under the canopy of perennial plants than in open spaces in the tropical dry forests of northwestern Mexico.
This type of interaction has also been documented between the barrel cactus Ferocactus acanthodes and the perennial bunchgrass Hilaria rigida (Franco & Nobel, 1989), between Opuntia leptocaulis and the shrub Larrea tridentata (Yeaton, 1978), and between O.
Finally, barrel cacti in the genera Echinocereus, Echinomastus, and Ferocactus reproduce mainly during spring/summer (Breckenridge & Miller, 1982; Johnson, 1992; McIntosh, 2002).
Semillas, germinacion y establecimiento de Ferocactus
senilis & Plemons-Rodriguez, 1997, 1998 Espostoopsis dybowskii Mauseth & Plemons-Rodriguez, 1998 Ferocactus chrysacanthus, F.
Chloroplast DNA evidence for divergence in Ferocactus and its relationships to North American columnar cacti (Cactaceae: Cactoideae).
By exposing virgin flowers to single visits by pollinators and then counting the number of seeds produced per fruit, McIntosh demonstrated that three species of medium-sized, cactus-specialist bees were the most effective pollinators of two species of Ferocactus.
fitchii, Ferocactus setispinus, Lophophora williamsii, Mammillaria heyderi, Mammillaria sphaerica, O.
A similar pattern of specialization can be seen with the cacti Ferocactus cylindraceus and F.
Pollination of Echinocereus fasciculatus and Ferocactus wislizenii.
Pollination of two species of Ferocactus interactions between cactus-specialist bees and their host plants.
Most seedlings of the boojum (Idria columnaris), a species restricted to Baja California, are found under shrubs (Humphrey, 1974), and seedlings of several other succulent species common in the Sonoran Desert, including Agave deserti and Ferocactus
acanthodes, are associated with nurse plants (Franco & Nobel, 1988, 1989; Jordan & Nobel, 1979, 1981).