Four additional questions are found in the instructions for Critter File 2 Assignment for Monday pp. The other factors, r and K, are assumed to be constants. Notice that variable rates or birth and death are shown on almost all the textbook figures. MORE equations and math stuff are on the lab worksheet instructions exponential pop growth . This equation can be derived from the equation on the exponential curve on fig 5.16.
N t is the size of the population after time t .
N 0 is the size of the population at the beginning of time t . What could have happened biologically in fig. MARK is windows-based and throroughly documented online. NIH Image is a public domain image processing and analysis program for the Macintosh. A free PC version of Image, called Scion Image for Windows, is available from Scion Corporation.