GEOG 4410 Study Guide - Final Guide: Organism, Propagule, Multiple Choice
Document Summary
Photography shows the general change in cacti and could identify. Sonoran desert: different species increasing in some places and, not in sync. Why is this one going up and this one going down, questions about changes, what is dynamic of community: complex cycles not well understood. Changes in height of upwardly growing species. Population structure: no comprehensive knowledge about growth or population structure over saguaro range. True for most desert species: carnegia gigantea and other columnar cacti. Limited accuracy for estimated age and growth rates of cacti and other: knowing how old they are is crucial, because we need to know if columnar species the population is doing well, birth vs death ecologically. Live 150 + years, sometimes difficult to distinguish between short and. Age estimation : long term regeneration patterns: no really way to do that. But there are few sites have long term data. One study done that estimated age based on height near tuscon.
