#3 - Physical Environment

#3 - Physical Environment - What were the major points made...

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1 What were the major points made in the required outside reading article? Darwinian fishery science: lessons from the Atlantic silverside ( Menidia menidia ) The physical environment: Factors that set limits on the distribution of organisms (and thus on the nature of communities) Some influential “ primary ” factors (the text calls them “conditions”) • Temperature Relative humidity • Salinity • pH [conc] of “pollutants” Can you think of any others? Some influential “ secondary ” factors • Nutrients – Ca, P, K, N... • Water How are these different from the primary factors?
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2 Why is reproduction the first attribute to be lost as conditions deteriorate? Is this “mandatory”, or could an organism find a way around this? Temperature Individual organisms respond to temperature in the manner described by the plot shown at the upper right (mostly) Lethal upper and lower bounds some intermediate optimum Hardiness zones for plants in North America
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