Biology 2601A/B Lecture Notes - Lecture 5: Ice Nucleus, Supercooling, Ice Crystals
26 Oct 2013
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Document Summary
Insects deal with temperatures changes in different ways behavioral, physiological, and biochemical changes. Insects are: most successful group of terrestrial animals, pollinators, biological control related to crops, and sustaining humans and other animals that we depend on, products (silk, honey, etc. , food. Preparation: eat lots before winter and store fat, stop growing and reproducing, as these are costly in terms of metabolism, find the right overwintering site. Why is being cold so bad: chilling injury. Loss of membrane fluidity and loss of ion homeostasis. Acute result of quick exposure to low temperatures (not freezing) and possibly caused by changes in cell membrane. Chronic caused by loss of ion homeostasis which eventually leads to loss of water: freezing injury balance. Damaging because of ice crystal formation: death if either chilling or freezing injuries are sustained, this will inevitably lead to death. Classifications of cold tolerance: die before freezing chill susceptible. Keep warm: keep from freezing freeze avoiding.
