Biology 484 – Ethology
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Biology 484 – Ethology Chapter 7 – The Evolution of Feeding Behavior. Chapter 7 Opener: A bullfrog has many dietary choices to make. The Common Whelk (or Snail). 7.1 Optimal foraging decisions by northwestern crows when feeding on whelks. The maximum cost/benefit ration is seen at the arrow.

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Slide1 l.jpg

Biology 484 – Ethology

Chapter 7 – The Evolution of Feeding Behavior




7 1 optimal foraging decisions by northwestern crows when feeding on whelks l.jpg
7.1 Optimal foraging decisions by northwestern crows when feeding on whelks

The maximum cost/benefit ration is seen at the arrow.


7 2 available prey versus prey selected l.jpg
7.2 Available prey versus prey selected feeding on whelks

Why would they not select the LARGEST mussels?



7 5 a foraging bout by the red knot l.jpg
7.5 A foraging bout by the red knot feeding on whelks

Time line showing how the bird will select to move to another foraging spot.


7 6 young garden skinks lower their foraging success in order to reduce the risk of predation l.jpg
7.6 Young garden skinks lower their foraging success in order to reduce the risk of predation

Feeding behavior can be influenced by other risks, such as that of predation pressures. In this case, it is snake scent.


Slide9 l.jpg

This is an image of the phorid fly on the left. On the right is the end result of an attack on a fire ant, the main food item of this fly.


7 7 foraging efficiency is compromised when the risk of predation is high l.jpg
7.7 Foraging efficiency is compromised when the risk of predation is high

The forager ant is preyed upon by the phorid fly. But the phorid fly will only consume insects with a head size of 1.8 mm or greater. Hence, during predation times, the forager ant only sends out smaller (less efficient foragers).


7 8 records of energy consumption in relation to trotting red line versus galloping green line l.jpg
7.8 Records of energy consumption in relation to trotting (red line) versus galloping (green line)

Look for the efficiency of trotting versus galloping.



7 10 two hereditary forms of an african cichlid fish l.jpg
7.10 Two hereditary forms of an African cichlid fish population?

Because their phenotype differs, the two forms do not compete for resources.





7 14 web ornament of an orb weaving spider l.jpg
7.14 Web ornament of an orb-weaving spider centers? (Part 2)

Web ornamentation is seen in the more reflective regions (the zig-zag patterns) seen in this web.





7 20 clay eating has evolved in several species of parrots l.jpg
7.20 Clay eating has evolved in several species of parrots centers? (Part 2)

Clay eating is useful for dissipating toxins the birds consume.





7 23 testing directional and distance communication by honey bees part 1 l.jpg
7.23 Testing directional and distance communication by honey bees (Part 1)

Test by von Frisch examining ability to learn direction from the dance in bees.


7 23 testing directional and distance communication by honey bees part 2 l.jpg
7.23 Testing directional and distance communication by honey bees (Part 2)

Test by von Frisch to test the communication of distance by the dance language in bees.


7 24 honey bee recruits really do read the symbolic information in dances l.jpg
7.24 Honey bee recruits really do “read” the symbolic information in dances

The blue bees were trained to think the food source was 70 meters away.


7 25 rapid buildup of recruited foragers at flower patches after discovery by scout bees part 1 l.jpg
7.25 Rapid buildup of recruited foragers at flower patches after discovery by scout bees (Part 1)


7 25 rapid buildup of recruited foragers at flower patches after discovery by scout bees part 2 l.jpg
7.25 Rapid buildup of recruited foragers at flower patches after discovery by scout bees (Part 2)


7 26 the adaptive value of the dance communication system part 3 l.jpg
7.26 The adaptive value of the dance communication system (Part 3)

Note especially how the bees in the winter benefit especially in enviornments with oriented (unipolarized) light.


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