Lecture 3: The Evolution of Feeding Behaviour Flashcards Preview

APS209 Animal Behaviour > Lecture 3: The Evolution of Feeding Behaviour > Flashcards

Flashcards in Lecture 3: The Evolution of Feeding Behaviour Deck (22):

predators and prey are often locked into a___

co-evolutionary struggle


Tinbergens discovery regarding search images

he observed that when a new type of caterpillar appeared in woodlands, songbirds rarely brought it to their nests. But once a few had been located, birds collected them at a greater rate --> birds has come to recognise the caterpillars and formed a search image


search images in Humans:

look for cues that match what you're looking for


Pietrewicz and Kamil used operant conditioning to investigate search images in captive blue jays::

blue jays were shown slides of cryptic moths of either the same or 2 different species
--the birds built up a search image only when shown one species, not when given both species
-favours rare moths?? Can't learn multiple


are search images always using sight?

NO, other senses can be used : Olfactory


example of animal who uses olfactory senses to create search image

Striped skunk, nocturnal forager and finds food by odour
-as skunks aged they could find food at further distances away & max distance it could be found also increased


Lizard foraging: 2 methods for predation (Vision/ambush and Olfaction/searching) Evolutionary history

3 evolutionary events?
started as Ambush, some evolved to become olfactory searchers


whats the difference in Social Insects and Other Group living animals??

-social insects: groups
--composed of related individuals, cooperation
--favoured by kin selection
-Other group living animals:
--groups normally composed on unrelated individuals
--cooperation not favoured by kin selection


social insects communication is

deliberate communication with nestmates, e.g. waggle dancing, direct leading, pheromone trails


Other group living animals communication is

incidental communication with conspecifics , e.g. observing location of successful foragers


other foraging advantages for groups:

Take much larger prey than themselves e.g. wolves take moose; army ants take large anthropoids/other insect colonies


Social insects:

-Groups composed of related individuals
-workers help by capturing prey (e.g. army ants) or defending a food patch, communicating the location of food to nest mates (wage dances in honey bees)


Key man for the Waggle Dance

Karl von Frisch


two types of waggle dance

-Round dance = food < 50m
-Figure of Eight Dance = food >50m


Figure of 8 waggle dance =

- food >50m
- Dances are performed in nest on vertical combs in darkness


waggle dance = what provides the distance and direction information and two tests used by karl von frisch

-duration of entire circuit
-duration of waggle run
-direction = angle
--Fan test & feeding stations along transect


Experiment on honey bee foragers: removing directional information

-natural combs are vertical
-when put horizontal combs, bees dance orientating to a directional light source instead of gravity


Social foraging in birds: Ospreys

-watch other birds returning to nest with fish, others leave in same direction to find shoaling fish
-informed fish find food quicker than naive birds


army ant colony =

small ants can capture larger prey by working together


Group hunting in Female Lions

they live in groups and hunt together. Group hunting carnivores take larger prey than solitary hunters
-6-12X higher


group hunting in varying females number of groups and food intake

-prey abundant = high one alone and in small groups
- prey scarcity = high when alone low in small groups, big food in high groups


why continue to hunt in group? Creel and Creel

benefits in meat gained but also in terms of energy expended chasing prey