Biological variation in populations is the process by which genetic and phenotypic differences arise, are maintained, and change in frequency among individuals within a species. It results from the ...

Endemic plants in high mountains are projected to be at high risk because of climate change. Temporal demographic variation is a major factor affecting population viability because plants often occur ...

A long-term fish experiment reveals how a mechanism called density dependence, in which the population growth rate slows as the number of individuals rises, affects population dynamics on time scales ...