GGR305H5 Lecture Notes - Lecture 4: Biogeography, Chlorophyll, Interspecific Competition
Document Summary
General rules of distribution and abundance: distribution of scissor-tailed flycatcher. Found primarily in texas and south-central part of the united. What are limiting factors: any factors that makes it difficult for an organism to live, grow and reproduce. These factors dictates where organisms can be found. Role of physical limiting factors temperature, wetness, light. Older cactus creates an environment in its vicinity, in which the temperatures are a bit warmer. This allows for young cactuses the ability to thrive or survive through periods of temperatures below freezing: shorter number of days indicates more optimal temperature. Woodrats seem to illustrate the effects of hot temps: mammals. Allen"s rule: species in cold environments have shorter extremities relative to body mass. Gloger"s rule: coloration of related forms is correlated with. Light: xerophytes low moistures required, mesophytes medium moisture required, hydrophyetes high moisture required (fully saturated soils, heliophytes, sciophytes, reproduction: example of virginia pine. Plants: large, soft leaves, with a high level of chlorophyll.
