Ionic Regulation in Marine Invertebrates
Summary
Marine invertebrates inhabit environments where salinity, pH and temperature can fluctuate dramatically. To maintain cellular function and systemic homeostasis they employ specialised epithelia—most notably gills, branchial chambers or integument—to regulate the movement of ions such as Na⁺, K⁺, Ca²⁺ and Cl⁻. Active transporters, including Na⁺/K⁺-ATPase and V-type H⁺-ATPase, generate electrochemical gradients that drive secondary ion exchangers and channels. Complementary strategies involve the biosynthesis or uptake of organic osmolytes (for example taurine and betaine) to counter osmotic pressure without denaturing proteins. Euryhaline species demonstrate remarkable plasticity by modulating transporter abundance and activity through transcriptional and post-translational mechanisms. Effective ionic regulation underpins key physiological processes—feeding, locomotion, reproduction—and determines resilience to climate-driven changes in seawater chemistry, with implications for aquaculture, conservation and ecosystem health.
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Ionic Regulation in Marine Invertebrates publication trend
The graph below shows the total number of articles in ionic regulation in marine invertebrates across all publications each year (not limited to Nature Index journals).
Technical terms
Na⁺/K⁺-ATPase: A membrane-bound enzyme that hydrolyses ATP to export three Na⁺ ions and import two K⁺ ions, establishing gradients essential for secondary transport.
V-type H⁺-ATPase: A proton pump that acidifies organelles or extracellular compartments, providing the driving force for transport of other ions such as Cl⁻.
Osmolytes: Small organic molecules (e.g. amino acids, methylamines) accumulated by cells to adjust intracellular osmotic pressure without disrupting macromolecular structure.
Haemolymph: The circulatory fluid of many invertebrates, analogous to vertebrate blood, which carries ions, nutrients and metabolic waste products.
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