Инд. авторы:	Solovyev M.M., Izvekova G.I., Kashinskaya E.N., Gisbert E.
Заглавие:	Dependence of pH values in the digestive tract of freshwater fishes on some abiotic and biotic factors
Библ. ссылка:	Solovyev M.M., Izvekova G.I., Kashinskaya E.N., Gisbert E. Dependence of pH values in the digestive tract of freshwater fishes on some abiotic and biotic factors // Hydrobiologia. - 2018. - Vol.807. - Iss. 1. - P.67-85. - ISSN 0018-8158. - EISSN 1573-5117.
Внешние системы:	DOI: 10.1007/s10750-017-3383-0; SCOPUS: 2-s2.0-85030830479; WoS: 000417867600005;
Реферат:	eng: The values of pH in the digestive tracts of 20 freshwater fish species inhabiting various Russian Federation waterbodies were studied. Only in six species (Coregonus lavaretus, Coregonus migratorius, Catostomus catostomus, Carassius gibelio, Rutilus rutilus, Leuciscus leuciscus) out of 20 species, the differences in pH values between different regions of the intestine were significant. Feeding habits, feeding frequency, and gut fullness in fish affected pH values. Temperature was one of the most important factors affecting pH values. During cold seasons (spring and fall; average water temperature: 8–10 and 5–6○C, respectively), the pH values in fish guts were higher than that in the summer seasons(water temperature 22–25°C) for C. gibelio, Perca fluviatilis, Cyprinus carpio, L. leuciscus, and R. rutilus from the Chany Lake. Similar results (lower pH values in intestine at higher water temperatures) were also obtained for C. gibelio in warmer years in comparison to colder years in the same waterbody and in L. leuciscus and P. fluviatilis in the different waterbodies with different water temperatures. It is hypothesized that dependence of pH in fish gut on temperature may serve as a regulatory mechanism for maintaining the activities of hydrolytic enzymes at the required level for their successful functioning. © 2017, Springer International Publishing AG.
Ключевые слова:	Perca fluviatilis; Leuciscus leuciscus; Cyprinus carpio; Coregonus migratorius; Coregonus lavaretus; Catostomus catostomus; Carassius gibelio; Russian Federation; Novosibirsk; Lake Chany; water temperature; temperature effect; summer; Rutilus rutilus; freshwater ecosystem; fish; feeding behavior; enzyme activity; digestive system; biotic factor; abiotic factor; Temperature; pH; Freshwater fishes; Feeding habits; Digestive tract; pH; Pisces;
Издано:	2018
Физ. характеристика:	с.67-85