ENGL121 Lecture Notes - Lecture 13: Christmas Bird Count, Tide, American Crow
3 Feb 2016
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Populations: groups of potentially interbreeding individuals of a single species that live within a given area. Distribution: size, shape and location of an area a population occupies. Ecological density: thinks about the niche and all the factors that limit an organism, thinks about an organism"s range of tolerance. An animal living at the edge of the niche (range of tolerance) is not going to do that great-puts more energy into basic maintenance costs. The physical environment will limit the areas where organisms will be found. Physical factors can be indirect or direct however we can correlate them. 1 has a wider distribution (across all different levels of inner tidal) 2 larvae exist at high levels of spring tide and adults have a shorter range on high spring tide. Random: equal chance of individuals being found anywhere. Clumped: organisms tend to be aggrated, more likely to be found closer to other organisms in some specific areas.
