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Birds presentation
Comparative Physiology-Birds/exam3
Question | Answer |
---|---|
phenotypic flexibility | reversible, temporary adjustments of phenotype to prevailing environmental or ecological demands |
benefits of phenotypic flexibility | better match physiology to current conditions, resulting in increased fitness |
difference between BMR and summit MR | BMR= minimum maintenance MR Summit MR= max MR in cold |
Msum and cold tolerance are ____________ correlated | positively |
physiological adjustments underlie seasonal phenotypes? | 1. organismal-MRs, cold tolerance, therm conductance 2. organ-hypertrophy, fuel delivery 3. tissue-mitochondria, lipid droplets, depot fat 4. cellular/molecular- oxidative capacity, substrate transport, gene/protein expression |
what are the two potential mechanisms of seasonal phenotypic flexibility in Msum | 1. enhanced cellular aerobic capacity- possibly coupled to changes in substrate or oxygen delivery pathways 2. larger muscles |