Effect of hypersalinic stress on hemocyte morphology and hemolymph cellular composition of the ark clam (Anadarakagoshimensis)

Bivalve mollusks as typical osmoconformers are unable to maintain a constant level of internal osmolarity in conditions of salinity stress. Adaptation to fluctuations of environmental salinity is achieved through cellular osmoregulatory responses, which are accompanied with a substantial shift in fu...

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Bibliographic Details
Published in:Fish & shellfish immunology 2023-07, Vol.138, p.108867-108867, Article 108867
Main Authors: Kladchenko, E.S., Kukhareva, T.A., Rychkova, V.N., Soldatov, A.A., Chelebieva, E.S., Andreyeva, A.Y.
Format: Article
Language:English
Subjects:
Anadara
Anadara kagoshimensis
Animals
Bivalvia
Cellular diameter
clams
erythrocytes
fish
Hemocytes
Hemolymph
hypersalinity
immunology
Nucleo-cytoplasmic ratio
osmolarity
Salinity
Salinity stress
salt stress
Scapharca
shellfish
viability
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Summary:Bivalve mollusks as typical osmoconformers are unable to maintain a constant level of internal osmolarity in conditions of salinity stress. Adaptation to fluctuations of environmental salinity is achieved through cellular osmoregulatory responses, which are accompanied with a substantial shift in functional state of cells. In the present work we investigated the effect of hypersalinity stress on hemolymph cellular composition and morphology of the ark clam (Anadara kagoshimensis) hemocytes. Ark clams were subjected to a gradual increase of environmental salinity from 18‰ to 35‰ and 45‰ and maintained at those conditions for two days. Exposure to hypersalinity 35‰ induced changes in erythrocyte morphology and led to a decrease of their diameter. At salinity 45‰ a substantial increase of hemocyte average diameter was observed, whereas the shape of cells did not change (18‰). Hyperosmotic stress was not associated with changes in hemocyte viability as well as changes in hemolymph cellular composition. The results of the present work demonstrate high tolerance of A. kagoshimensis to short-time exposure to hypersalinic conditions. •Hypersalinity was associated with changes in ark clam's erythrocyte morphology and diameter.•Hyperosmotic stress was not led to changes in hemocyte viability and hemolymph cellular composition.•Anadara kagoshimensis tolerance to short-time exposure to hypersalinic conditions.
ISSN:1050-4648
1095-9947
DOI:10.1016/j.fsi.2023.108867