. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Tem-perature: Metabolic Aspects and Perception 347 als alter their temperature resistance within genetic limitations. There are numerous examples of acclimatization to heat and to cold which may have a genetic basis. A frequently-cited but never-repeated experiment was conducted by Dallinger,^^ in which by very gradual increases in temperature flagellate Protozoa were after seven years made to survive and reproduce at temperatures as high as 70° C, well above the temperature which was lethal at the begin- ning
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Tem-perature: Metabolic Aspects and Perception 347 als alter their temperature resistance within genetic limitations. There are numerous examples of acclimatization to heat and to cold which may have a genetic basis. A frequently-cited but never-repeated experiment was conducted by Dallinger,^^ in which by very gradual increases in temperature flagellate Protozoa were after seven years made to survive and reproduce at temperatures as high as 70° C, well above the temperature which was lethal at the begin- ning of the experiment. In hot springs chlorophyll-bearing algae are common at 60° C, and some non-green algae at 70°.-^ Rhizopods are reported from. A cc/fm at/on ternpercf/ure â ^O 'C. Fig. 86. Relation between acclimatization temperature and the temperature lethal for 50 per cent of goldfish in 14 hours. Arrows indicate death of ail of a group of fish. From Fry, Brett, and Clawson.^*" natural waters at °, flagellates at 51°, and ciliates at 46°. Brues found numerous insects and some crustaceans and snails in hot springs at around 38°; Chironomus larvae were thriving at 49-51° C. Fish rarely are found at tem- peratures above 30°, but frog tadpoles have been collected from water at 40- 4jo_27 y^ese natural temperatures are well above lethal temperatures deter- mined on laboratory specimens reared at lower temperatures. Mayer^-" reports Aurelia from Halifax dying at 29-30°, those from Tor- tugas at °; also Limulus from Woods Hole dying at °, and those from southern Florida at °. Mayfly nymphs from a ° stream died at °, whereas others of the same species from a ° habitat died at °.^"^ Specimens of the prawn Pandalus from waters 5° to 7° C. at Kristineberg, Sweden, could not be maintained in aquaria at temperatures above 11° C,. Please note that these images are extracted from sc
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