BIOL 180 Lecture 27:02 & 04:03

Ex some schistosomes blood flukes avoid antibody

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: mune mechanisms. Ex. Some schistosomes (blood flukes) avoid antibody attack by coating themselves with proteins of the host before antibodies become numerous. PREDATION Predator= Prey = - Predator typically larger than prey and less specific than parasites - often exploit many different species. Adaptations/Defenses Of Prey Standing/Constitutive Defenses 1. Hide, run away 2. Weapons/Active Defense - Foul-smelling or stinging secretions. Ex. skunk, whip scorpion, bombardier beetles - Spines or armored body coverings. Ex procupines and armadillos 3. Camouflage - Appearance/posture match background color & pattern. Ex. Stick insect - Break up body form with black and white. Ex. zebra, tapir, tiger salamander 4. Warning coloration/Aposematism - Contain noxious chemicals. (Produce themselves or accumulate from food plant). - Advertise with conspicuous color patterns - black w/yellow, orange or red stripes. - Innate or learned avoidance response by predators. Ex. Monarch butterfly, yellow jackets, coral snakes, poison-arrow frogs - Why aren’t all prey species noxious or unpalatable? 5. Mimicry - Palatable organisms evolve to resemble noxious ones. 6. School/flock/herd Formation - Predator detection, dilution & confusion effects, group defense. Inducible Defenses - Defenses triggered by presence of predators. - Advantages: 1. 2. - Disadvantage? Ex. Predator-induced changes in body morphology in Crucian carp the predator won't fit in the mouth any longer and so therefore it can't be eaten by a pike --> however it takes more energy to get to this size a...
View Full Document

This note was uploaded on 02/24/2014 for the course BIOL 180 taught by Professor Freeman during the Winter '07 term at University of Washington.

Ask a homework question - tutors are online