UNT BIOL 2140 - Final Exam Study Guide (12 pages)

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Final Exam Study Guide



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Final Exam Study Guide

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Final exam study guide: Species, communities, ecosystems


Pages:
12
Type:
Study Guide
School:
University of North Texas
Course:
Biol 2140 - Ecology
Ecology Documents

Unformatted text preview:

BIOL 2140 1st Edition Final Exam Study Guide Unit 1 Species Surface area to volume ratio Key morphological factor in temperature tolerance When the surface area is large compared to the volume small thin things heat is gained and lost quickly because there is lots of surface area to gain and lose heat and relatively little volume to retain heat Nitrogen wastes Kidneys urinary system filter waste from the blood and control water balance electrolyte concentration and pH Bluegill freshwater fish especially dump water and retain salts Eliminate nitrogen as toxic ammonia Triggerfish saltwater especially retain water dump salts Eliminate nitrogen as toxic ammonia Both fish balance water and salt concentrations based on the environmental conditions Kangaroo rat especially retain water dump super concentrated salts Eliminate nitrogen as less toxic urea Land animals must get rid of nitrogen but without losing too much water Therefore land animals excrete highly concentrated nitrogen as less toxic urea Phenotypic plasticity Populations will harbor variation Phenotypic plasticity deals with the ability of an organism to change its phenotype in response to changes in the environment Not every organism of a given species will have the same plasticity since each will have different phenotypes What makes the same species different Different alleles in DNA different combinations of alleles This gives rise to genetic diversity and thus phenotypic diversity in a population Therefore some species may show higher phenotypic plasticity than other individuals in the species Ecological niche Includes the habitat where the organism lives and the role what the organism does There are two types of niches one that is theoretical fundamental niche and one that is realized the actual niche Ecological envelopes are used in fundamental niches to keep a catalog of the conditions the organism is known to survive in temperature and moisture are key factors in revealing the habitat conditions



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