Morphofunctional remodelling of the osmoregulatory system in starred sturgeon Acipenser stellatus (Acipenseridae) during transition from hyperosmotic to hypoosmotic regulation

Autor: A. A. Gerasimov, O. G. Semenova, A. V. Vyushina, L. S. Krayushkina
Rok vydání: 2015
Předmět:
Zdroj: Journal of Ichthyology. 55:259-272
ISSN: 1555-6425
0032-9452
DOI: 10.1134/s0032945215020101
Popis: Morphological changes in the complex of functionally linked organs responsible for maintaining the osmotic homeostasis in immature euryhaline acipenserid species—starred sturgeon Acipenser stellatus—in the process of adaptation to hyperosmotic environmental salinity of 12.5–14.6‰ (403–472 mOsm/L) have been studied with the following characteristics: dynamics of blood serum osmolarity, morphofunctional changes in the neuroendocrine structures (preoptic and tuberal nuclei in the hypothalamus, adrenocorticotropic cells of hypophysis), peripheral endocrine glands (thyroid and interrenal), effector organs (chloride cells of gills and kidney), dynamics of concentrations of cortisol and thyroid hormones (T3 and T4) in the blood serum, activity of Na+/K+ ATPase in homogenates of gills, kidney, and directly in chloride cells. Transition from hyperosmotic (in fresh water) to hypoosmotic (in hyperosmotic environment) regulation is determined by the essential morphofunctional remodelling of the osmoregulatory organs under study. During this period (72 h) serum osmolarity increases. The neuroendocrine and endocrine systems respond to changes in the environmental salinity in a short time interval (1–24 h) thus stimulating morphofunctional changes in the effector organs and their transition to hypoosmotic regulation, which restores serum osmolarity close to the initial level.
Databáze: OpenAIRE
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