Dictyostelium can utilize one of three survival strategies when food starvation-

 Microcyst formation, favoured in dark & wet conditions, or ammonia levels are high.

 Zygote formation, favoured in dark & wet conditions, & is triggered by ethylene produced by the cells. 

Cell aggregation & differentiation

TLS Online TPP Program

#Id: 9384

#Unit 11. Evolution and Behavior

Taxis - movement toward or away stimuli

TLS Online TPP Program

#Id: 9385

#Unit 11. Evolution and Behavior

Fixed action pattern - A predictable series of actions triggered by a cue, sometimes called the key stimulus.

TLS Online TPP Program

#Id: 9386

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9387

#Unit 11. Evolution and Behavior

Stimuli
Anything that can trigger a physical or Behavioral change

TLS Online TPP Program

#Id: 9388

#Unit 11. Evolution and Behavior

Sign stimulus (releaser)

The essential feature of a stimulus, which is necessary to elicit a response.

TLS Online TPP Program

#Id: 9389

#Unit 11. Evolution and Behavior

Male stickleback fish develop red colour on their ventral side in the breeding season and maintain territories. 

When a conspecific male intruder enters their territory, resident males perform an aggressive display. 

The ethologist Niko Tinbergen presented models of different shapes to territorial male stickleback fish. He found that models of any shape elicited aggressive displays, provided the ventral part of the models was coloured red.