lecture 13 - thermoregulation 08Ann-2

lecture 13 - thermoregulation 08Ann-2 - Insect...

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Unformatted text preview: Insect Thermoregulation I. Types of thermoregulation A. Homeothermic v. Poikilothermic T body T environment I. Types of thermoregulation B. Endothermy v. Ectothermy I. Types of thermoregulation C. Most Insects: D. SIZE MATTERS Heat gain Heat loss II. Avenues of Heat Exchange A. Behavioral 1) 2) 3) 1) Coleoptera: Tenebrionidae 2) Coleoptera: Cicindellidae 3) Coleoptera: Silphidae 4) Lepidoptera: Lycaenidae 5) Orthoptera: Romaleidae (lubber) THE QUESTION Is behavioral thermoregulation locally adapted or phenotypically plastic? THE EXPERIMENT Adult grasshoppers caught along an altitudinal gradient in the Sierra Nevada, CA. Melanoplus sanguinipes Eggs laid in lab, and reared at high or low Temperature. Is behavioral thermoregulation locally adapted or phenotypically plastic? Radiation source 6) Diptera B. Physiological 1) Hymenoptera 2) 2) Dead bee Live bee 3) Lepidoptera: Pieridae 4) Lepidoptera: Sphingidae Preflight warmup and countercurrent heat exchange 5) New Zealand wetas Orthoptera Anostostomatidae 6) Lepidoptera: Lymantriidae (tussock moths) Heat tolerance: Urban physiology Cities can be 12C higher than surrounding areas. Atta sexdens So Paolo, Brazil THE QUESTION: Can urban insects tolerate the increased heat? THE EXPERIMENT: Compare urban vs. rural ants at high heat stress Angilleta et al. 2007 PLoS ONE At 42C P = 0.02 Black = urban colonies Gray = rural colonies Recovery from chill coma at 0C P = 0.67 Genetic? or Environmental? Heat for defense Apis cerana japonica VS. Vespa mandarina japonica http://news.nationalgeographic.com/news/2005/10/1012_051012_hornet_video.html III. Why is temperature regulation important to insects A) B) C) D) SNOWY TREE CRICKET Its song can be used to tell the temperature count the number of chirps in 13 s and add 41 to get the degrees in Fahrenheit. Orthoptera: Gryllidae E) ...
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This note was uploaded on 05/03/2008 for the course BIOS 326 taught by Professor Rudgers during the Spring '08 term at Rice.

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lecture 13 - thermoregulation 08Ann-2 - Insect...

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