A drought in ethiopia results in the deaths of thousands of...

A drought in Ethiopia results in the deaths of thousands of wild goats. What is this an example of? A density dependent limiting factor Logistic growth A density independent limiting factor An increase in the carrying capacity

Transcript

00:01 Hello.

00:02 This question is asking about a density dependent factor.

00:13 And this term is used to describe factors that have a correlation to the population size.

00:34 One example would be disease.

00:44 If there is a small population size, frequently disease is not an issue because organisms do not come in contact with each other to spread it, especially if it's caused by a pathogen or something of that nature.

01:00 However, if there's a very large population, then the disease will spread very rapidly through that population.

01:09 Some other examples include predation.

01:14 So this can be either a positive or a negative correlation, especially if you are the predator.

01:21 If there is lots of the prey, then it's going to be a positive for the predator.

01:30 If there's not much of the prey, it's definitely going to be a negative for the predator.

01:35 And another one that's correlated to population size is competition.

01:41 When organisms are competing for food or shelter or anything else in their specific habitat, competition is definitely a density -dependent factor.

01:55 The more organisms that are there, the more fierce the competition.

01:59 And there are going to be winners and losers.

02:02 All right.

02:02 So when we look at our choices here, examples of density -dependent factors.

02:10 Typically, most weather events are density -independent...