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Karen Ing (49)
Lecture 10

Env 200 feb 26 lecture 10.docx

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School of Environment
Karen Ing

Env 200 feb 26 lecture 10  Geographic variation o Variation in kinds and #s of species found on the planet as a function of geographic variation o Biomes can be classified by a system corresponding to latitude (temperature) and humidity  Community, ecosystem, landscape, biomes  Characteristic assemblage of plants and animals that have adapted and evolved to specific climatic conditions o REVIEW FIGURE 6.1 and 6.2 o Designating large areas as biomes is somewhat of an oversimplification given the 3 dimension structure of landscape  World’s terrestrial biomes o Tundra, boreal forests, chaparral etc  In aquatic systems moisture is irrelevant but temperature, light, nutrients and a variety of biological interactions remain important variables regulating species distributions o Nutrients are not equally distributed into the oceans  Ecosystems services o Env benefits provided by ecosystems that are often taken for granted  Ex: forests; purify air and water  Wetlands purify water and provide flood and drought protection  Costas provide a buffer against storms and dilutes and removes pollutants etc  How ecosystems organize themselves o Spaces/ Niches: How species Coexist, how do they interrelate, why some species are happy in one place but not in another  Competition exclusion principle-two species that have exactly the same requirements cant coexist in the exactly the same habitat  Habitat complexity  Ecological niche-what an organism does for a living (profession)  Measured as set of all env conditions under which species can persist and carry out its life function o Niches/spaces: how many different spaces are there for different species to interact and live  What does an organism do for a living?  Fundamental vs realized niches o However having a wide tolerance range (a wide fundamental niche) does not guarantee a species will occupy the whole of the niche o Biological interactions with other species may restrict organisms to a realized niche that is smaller than their fundamental niche  Interaction between species o Symbiosis-benefits both  When two diff species interact there could be a series where both species gain benefits  Ex: birds are
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