Phenotype
4 important questions on Phenotype
How do the salmon cope with the physiological callenges in the sea? name 4
What triggers the salmon back to fresh water (homing) and how does the salmon finds its way back?
-navigation in the sea through the sun and magnetic fields
-it finds it way back through chemical signals affecting the olfactory system and hypothalamus (olfactory imprinting when it was young)
How is the transition from salty to fresh water for homing salmons?
-reduced drinking
- decreased vasopressin, water retention in the kidneys and diluted urine
-NaCl pump: increased active salt retention
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What about the food intake of the homing salmon back in the river before spawning?
stomach degeneration, more room for the sperm/eggs
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