PDS APES 8th Period 2009-10

Hey guys, do we have to know the different river zones? Crenon, Rhithron, Potamon, and thier characteristics?

Now i understand that Generalist species can easily “adapt” to a change in environment an the  food it eats, where specialist species focus more on one specific method of eating or have a specific need of one type of  food. Like a Panda bear is a specialist because it only eats bamboo shoots. But a Snakehead for example, i know as stated in the article that it is quick to “adapt” to a change in environment.  It will eat more than just one type of fish, however, it specializes in preying on fish. It has evolved a large mouth, and rows of sharp teeth to exclusively eat fish. does this make it a Specialist species, because it only preys on fish? or a Generalist species, because it can adapt to more than one environment?

(Biogeochemical Cycles, p54-59 & S39)

Remember CHONPS?

Do we really need these six elements? YES!!! They form the building blocks of life ( 4 macromolecules) Can be limiting factors if too little or too much is present Limiting factor- (an abiotic factor that prevents growth or life of a species Major Cycles 1)    Carbon - CHO “every living thing has CHO in it” Reservoirs – 1) Sedimentary Rock – 2) Oceans – 3) Fossil Fuels Key equations – Photo synthesis ( takes CO2 from atmosphere) -Respiration (puts CO2 into atmosphere) -Burning Coal, Natural Gas or Gasoline (puts CO2 into atmosphere) -Carbonic Acid (takes CO2 out of atmosphere) Anthropogenic impacts (human) -       Burning CO2 increases atmosphere -       Deforestation (trees are a reservoir) 1)    Nitrogen – Critical for Amino Acids and Nucleic Acids. Also Nitrate (NO3) critical for plants. Reservoirs – 1) Atmosphere (78% N2 “N2 is unusable to living creatures”) – 2) Oceans – 3) Soil Matter Key Equations – 3 Nitrogen Equations (Nitrogen Fixations, Nitrification, Denitrification) -Nitrogen Fixation by lightning -Burning Fossil Fuels (Oil, Coal, Gasoline) Anthropogenic Impact -Harbor-Bosh (Artificial Fertilizers) -Burning Fossil Fuels (HNO3- Acid Rain) -Run off from Fertilizers N Cycle from http://www.fossweb.com/resources/pictures/16327852.gif

hey guys, i understand the idea of an S-curve, and how population levels out when the demand for space or resources becomes too high.  however, when a population exceeds its maximum capasity and reaches its inflection point, and then drops back down before it levels out, does this have a different name? or is it still considered an S-curve.