Editing Allee effect (section)

===Component vs. demographic Allee effects===
The ''component Allee effect'' is the positive relationship between any measurable component of individual fitness and population density. The ''demographic Allee effect'' is the positive relationship between the overall individual fitness and population density.

The distinction between the two terms lies on the scale of the Allee effect: the presence of a demographic Allee effect suggests the presence of at least one component Allee effect, while the presence of a component Allee effect does not necessarily result in a demographic Allee effect. For example, cooperative hunting and the ability to more easily find mates, both influenced by population density, are component Allee effects, as they influence individual fitness of the population. At low population density, these component Allee effects would add up to produce an overall demographic Allee effect (increased fitness with higher population density). When population density reaches a high number, negative density dependence often offsets the component Allee effects through resource competition, thus erasing the demographic Allee effect.<ref name=kramer>{{Cite journal |vauthors=Kramer AM, Dennis B, Liebhold AM, Drake JM |year=2009 |title=The evidence for Allee effects |journal=Population Ecology |volume=51 |pages=341–354 |doi=10.1007/s10144-009-0152-6 |issue=3|bibcode=2009PopEc..51..341K |s2cid=36920194 }}</ref> Allee effects might occur even at high population density for some species.<ref name=book1 />