lecture+2+2010 - Niche Ecology ESPM 114 Lecture 2 hat is a...

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Unformatted text preview: Niche Ecology ESPM 114 Lecture 2 hat 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 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) Fundamental niche-entire spectrum of conditions in which a species can survive and reproduce Species cannot persist in conditions outside the dark line Factor A Factor B Definitions of niche can include as many factors as are known to impact a species persistence Rainfall Temperature Realized niche- set of conditions actually used by a species due to competition with other species Niche Balanus out-competes Chthamalus causing Chthamalus realized niche to be much smaller than its fundamental niche Question: Can realized be larger than fundamental??? Three most important determinants of the niche:...
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This note was uploaded on 02/04/2011 for the course ESPM 114 taught by Professor Brashares during the Spring '11 term at University of California, Berkeley.

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lecture+2+2010 - Niche Ecology ESPM 114 Lecture 2 hat is a...

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