期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 221, 期 21, 页码 -出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.186338
关键词
Manduca sexta; Thermal biology; Plasma; Density; Insects
类别
资金
- National Science Foundation [1558052, 0938047, 1301037]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1558052] Funding Source: National Science Foundation
- Div Of Engineering Education and Centers
- Directorate For Engineering [1301037] Funding Source: National Science Foundation
Hemolymph is responsible for the transport of nutrients and metabolic waste within the insect circulatory system. Circulation of hemolymph is governed by viscosity, a physical property, which is well known to be influenced by temperature. However, the effect of temperature on hemolymph viscosity is unknown. We used Manduca sexta larvae to measure hemolymph viscosity across a range of physiologically relevant temperatures. Measurements were taken from 0 to 45 degrees C using a cone and plate viscometer in a sealed environmental chamber. Hemolymph viscosity decreased with increasing temperature, showing a 6.4-fold change (11.08 to 1.74 cP) across the temperature range. Viscosity values exhibited two behaviors. changing rapidly from 0 to 15 degrees C and slowly from 17.5 to 45 degrees C. To test the effects of large particulates (e.g. cells) on viscosity, we also tested hemolymph plasma alone. Plasma viscosity also decreased as temperature increased, but did not exhibit two slope regimes. suggesting that particulates strongly influence low-temperature shifts in viscosity values. These results suggest that as environmental temperatures decrease, insects experience dramatic changes in hemolymph viscosity, leading to altered circulatory flows or increased energetic input to maintain similar flows. Such physical effects represent a previously unrecognized factor in the thermal biology of insects.
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