# Ecology

## Does model averaging make sense?

Brian Cade published a scathing condemnation of current statistical practices in ecology. It promises to be highly influential; I have seen it cited by reviewers already. I agree with a great many points Brian raised. I also disagree with one very central point.

## Accounting for exposure days

Every year I suggest a student use Terry Shaffer’s log exposure models for nest survival (Shaffer 2004). And every year I spend hours trying to figure out why the code in the help section of ?family doesn’t work. So this year I’m writing it down.

## How do predators change population growth, part II?

Last week I starting thinking about how predation might affect a species that otherwise experiences logistic growth due to intra-specific competition. I looked at predators with both Type I and Type II functional responses to their prey. What about predators with Type III responses?

## How do predators change population growth?

Predators are one of the factors contributing to death rates, and so if a species has any predators at all, predation is part of the logistic model.