00:01
Which of these is a density -independent factor? a severe drought, an intestinal parasite, a fatal virus or severe overcrowding.
00:10
So all of these are things that can limit a population size.
00:14
And these factors can be either density -dependent or density -independent.
00:20
So a density -independent factor is one that is going to affect the individuals in a population the same amount, regardless of how many of them there are.
00:31
A density dependent is going to have a different effect depending on if the population is crowded or not.
00:38
And a really easy way to tell them apart that works on most of these factors is that density dependent ones are usually biotic, and the independent ones are usually abiotic.
00:53
So if we look at this, severe overcrowding, that is absolutely density dependent.
00:59
The impact of overcrowding depends on the density of the population.
01:04
If it's less dense, then it's less damaging a factor.
01:08
So this is definitely dependent...