lecture 2 2009

lecture 2 2009 - ESPM 114 Lecture 2 Niche E l Ni h Ecology...

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i h E l ESPM 114 – Lecture 2 Niche Ecology
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What is a “niche”? Grinnell (1917) – characteristics of sites where an organism can live; where conditions are suitable Elton (1927) – position and function performed by a species its community in its community Hutchinson (1957) – region in a multi-dimensional space of environmental factors that affect the welfare of the species Conditions in which a species can survive and reproduce (Determined by: Water economy, temp tolerance, body size, diet, circadian and circannual rhythms, habitat use, behavior)
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Niche Fundamental niche -entire spectrum of conditions in which a species can survive and reproduce ture ealized iche t of conditions Tempera t Realized niche - set of conditions actually used by a species due to competition with other species Species cannot persist in conditions outside the dark line or B efinitions of niche can Rainfall Fact o Definitions of niche can include as many factors as are known to impact Factor A a species persistence
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This document was uploaded on 07/22/2009.

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lecture 2 2009 - ESPM 114 Lecture 2 Niche E l Ni h Ecology...

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