Foraging Wildlife

Helpfulness: 0
Set Details Share
created 2 years ago by James_Bedortha
2 views
foraging
show moreless
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X
Show:
1

Foraging

includes recognizing,
searching for, capturing, handling,
and eating food items

2

Optimal foraging theory

compromise between benefits of
nutrition and costs of obtaining food

3

Optimal foraging theory is used to describe

  • Breadth of diet/preferences
  • Strategies of movement
  • Use of patchy habitats
4

Marginal Value theorem

Optimal foraging where
Resources in discrete patches

5

As animals forage, balance

  • Resource intake
  • traveling time
  • foraging time
6

Time in a patch depends on

  • Distance between patches
  • Condition of matrix
  • Quality of current patch
7

Optimal time in patch

Tangent from time of departing last patch to resource intake curve

8

Individuals will stay longer if

  • Patches are farther apart and thus there is a higher cost of travel or
  • Current patches are rich in resources
  • Lower predation risk
9

Giving up density

  • Can depend on distance between patches
  • Or distance from central place (den, nest)
10

A predator spends time on 2 activities

  1. Searching for prey
  2. Prey handling which includes: chasing, killing, eating and digesting.
11

Consumption rate is limited

Total consumption time (T) = sum of search time + handling time

12

Predators respond to prey density change

1. Numerical response
• change in predator abundance
2. Functional response
• change in intake rate

13

Prey switching in response to

costs