CHAPTER 13

CHAPTER 13 - CHAPTER 13: A) PREDATORS and PREDATION...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 13: PREDATORS and PREDATION A) Predation: Refers to the action of an organism that depends in total or in part on killing another animal for its food, e.g. bobcat, trout, hawk, robin, frog, and dragonfly. 1) Effect of predation -- three major opinions expressed: a) Bad effect: Unchecked, predators will eradicate their natural prey. b) No effect: Predators remove only those individual prey that would have died from other causes. c) Beneficial effect; Predators selectively cull less fit members from the prey population. 2) Compensatory mortality and predation: (see page 36) a) Threshold of security: That low level of population density of the prey species at which predators no longer find it profitable to hunt the prey. Above this line prey are at risk of predation. b) Pinch Period: That period of an annual cycle (seasonal) when the factors necessary for life are least favorable.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
c) Reproduction inversity principle: 1. Example: Coyote mortality Comparison of Average Litter Sizes of Coyotes
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/18/2012 for the course BIO 260 taught by Professor Dannyraymer during the Fall '11 term at BYU.

Page1 / 4

CHAPTER 13 - CHAPTER 13: A) PREDATORS and PREDATION...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online