Abstract
The concentration of sodium and potassium ions in erythrocytes in perch Perca fluviatilis L. was compared to that in ten other freshwater fish species. The cation concentration was determined by flame photometry. The participation of erythrocyte cations in the buffer and respiratory processes that promote the specific resistance of perch to unfavorable factors is substantiated. Among the investigated fish species, the highest sodium concentrations in red blood cells were found in perch and pike, who are the most resistant to water acidification. High sodium concentration in red blood cells indicates a high alkalization capacity of the erythrocytes’ inner environment and is one of the mechanisms for enhanced resistance of perch to water acidification. In perch the potassium concentration in erythrocytes is at the lower limit of the range typical for fish resistant to hypoxia. A high potassium level in red blood cells is regarded as one of the mechanisms for promoting the tolerance of perch to hypoxia. Analysis of data from the literature revealed the same kind of participation of erythrocyte sodium in buffer processes and erythrocyte potassium in respiratory processes in marine fish as in freshwater fish. When determining the level of hematocrit, higher values of this parameter were found in perch as compared to other freshwater fish. Other known physiological and biochemical mechanisms for promoting total and specific resistance of perch to detrimental factors are also analyzed in the paper.
Highlights
Концентрацию ионов натрия и калия в эритроцитах окуня Perca fluviatilis L. сопоставляли с таковой у десяти других видов пресноводных рыб
The cation concentration was determined by flame photometry
The participation of erythrocyte cations in the buffer and respiratory processes that promote the specific resistance of perch to unfavorable factors is substantiated
Summary
ЭРИТРОЦИТАРНЫЕ КАТИОНЫ в адаптационных процессах У окуня PERCA FLUVIATILIS L. (PERCIDAE). Концентрацию ионов натрия и калия в эритроцитах окуня Perca fluviatilis L. The concentration of sodium and potassium ions in erythrocytes in perch Perca fluviatilis L. was compared to that in ten other freshwater fish species. В настоящее время известны некоторые физиолого-биохимические механизмы, повышающие специфическую устойчивость окуня к указанным неблагоприятным факторам: жаберные механизмы адаптации к низким pH воды [Виноградов, 2000; Evans et al, 2005] и эффективная гемоглобиновая буферная система, а также высокое сродство гемоглобина к кислороду, как и у других устойчивых к гипоксии рыб [Камшилов и др., 2014; Запруднова и др., 2015]. В настоящей работе концентрацию ионов натрия и калия в эритроцитах у окуня сопоставляли с таковой у других видов пресноводных рыб с разной устойчивостью к закислению воды и недостатку в ней кислорода. Целью данной работы было выявление участия указанных выше ионов в буферных и дыхательных процессах и, таким образом, в обеспечении устойчивости окуня к низким pH воды и гипоксии
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