Document Detail

Respiration rate and oxy-regulatory capacity in cold stenothermal chironomids.
MedLine Citation:
PMID:  18680747     Owner:  NLM     Status:  MEDLINE    
The effects of temperature and oxygen saturation on the respiration rate of two cold stenothermal chironomids, Diamesa insignipes and Pseudodiamesa branickii were investigated. Fourth instar larvae were collected in winter in a glacio-rhithral stream (1300 m a.s.l., Alps, NE-Italy) and their respiration rate was measured with a Clark's electrode in the range 0-14 degrees C. The respiration rate was significantly higher in D. insignipes than in P. branickii at low temperatures (<or=4 degrees C), higher in P. branickii between 8 and 12 degrees C and comparable at 14 degrees C. Higher values of R (regulation value), R(25%) (respiration rate at 25% oxygen saturation) and b(1)/b(2) (slope ratio in piecewise linear regression), and lower values of P(c) (critical pressure) and I (initial decrease) were recorded in P. branickii than in D. insignipes. These values are compatible with oxy-regulatory behaviour in P. branickii, whereas D. insignipes appeared to be almost an oxy-conformer. On the basis of this autoecological information, new implications regarding survival of species from cold, high altitude habitats under changing climatic conditions are made.
Valeria Lencioni; Paola Bernabò; Stefano Vanin; Paolo Di Muro; Mariano Beltramini
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-16
Journal Detail:
Title:  Journal of insect physiology     Volume:  54     ISSN:  0022-1910     ISO Abbreviation:  J. Insect Physiol.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-10-13     Completed Date:  2008-11-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1337-42     Citation Subset:  IM    
Section of Invertebrate Zoology and Hydrobiology, Museo Tridentino di Scienze Naturali, Via Calepina 14, 38100 Trento, Italy.
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MeSH Terms
Cell Respiration
Chironomidae / metabolism*
Cold Temperature*
Larva / metabolism
Oxygen / metabolism*
Reg. No./Substance:

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