Ecology 6th Edition by Charles Krebs

تمرين 10

Large herbivorous mammals are not always present in habitats dominated by spiny plants. Why might this be? Janzen (1986) reviews the vegetation of the Chihuahuan Desert of north-central Mexico and interprets the abundance of spiny cacti as reflecting the "ghost of herbivory past." Read Janzen's analysis and discuss how one might test his ideas.