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Metabolic response of Lumbriculus variegatus to respiratory uncoupler in cold and anoxic water
Author(s) -
Penttinen OlliPekka,
Kukkonen Jussi V. K.
Publication year - 2000
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620190816
Subject(s) - pentachlorophenol , anoxic waters , anaerobic exercise , respiration , chemistry , biology , energy metabolism , environmental chemistry , biophysics , physiology , anatomy , endocrinology
A direct calorimetry approach was applied to compare physiological interaction of pentachlorophenol (PCP) with the energy metabolism under anoxia and normoxia in the aquatic oligochaete worm Lumbriculus variegatus. In normoxia, heat dissipation begins to accelerate 10 h after the onset of PCP exposure until it settles at a new plateau level, and shows a twofold increase from the nonimpact rate. In anoxia, heat output was suppressed down to a level of ∼18% (7°C) of normoxia. An anoxic PCP exposure did not produce any notable changes in the heat output, and the amount of chemical accumulated in tissues was only a fraction (18%) of that accumulated in normoxia. Whether the inhibition of the physiological response during anoxia was due to a shift to anaerobic metabolism or to reduced accumulation in tissues, or combination of both factors, was unclear.