Summary of Lecture 1 Chapter 50. Definitions of ecology and levels of organization Abiotic factors that determine distribution patterns of organisms (solar radiation, latitudinal variation in temperature and rainfall, effects of water and topography)
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Fischers lovebird cuts long strips of vegetation for nest building
Peach-faced lovebirds cut short strips and tuck them into tail feathers
Experimental hybrids exhibit intermediate behavior. Strips are mid length, and birds fail to let go when tucking strips into tail. Birds learn to use beaks for transport
After years, birds still turn back, revealing a genetic component to behavior: but behavior is modified by experience
Red bellies on fish models elicit aggressive territorial responses in male sticklebacks
Male fish will not attack invading males that lack the red belly
Careful experimentation demonstrated that Digger wasp females locate nest using visual cues (arrangement of landmarks, not the objects themselves)
Sonograms of the partial repertoire of one male brown-headed cowbird
Some species can generate hundreds of song variants
Does this confer a fitness advantage?
“Apparent size” used to select prey
Low prey density
High prey density
Large prey favored at high density, but not to extent predicted