Distribution and Abundance

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The distribution and abundance of a species should be influenced strongly by the presence of suitable habitat. Both very successful in dry climates; saguaro cant tolerate cool temperatures. It uses water rapidly when its available but shuts down its metabolic processes during periods of extended drought. It can also tolerate cold conditions as well. Saguaro has a more limited distribution. (leaves to reduce water loss modified spine leaves) The northern limit of the saguaros distribution lies close to the boundary south of which temperatures never remain below freezing for more than 36 hours. Organisms depend on certain species for resources go to an area where they are abundant. Cacti put in as a hedge in australia spread everywhere (ruining land for feeding animals). Used a moth as control that feeds on the cactus greatly reduced the abundance. It hasn t been eradicated but it springs up randomly in different areas.

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