Transport-related enzymes and osmo-ionic regulation in a euryhaline freshwater shrimp after transfer to saline media

Author:

Asaro Antonela1ORCID,Pinoni Silvina A.12,Lorin-Nebel Catherine3ORCID,Ituarte Romina B.1ORCID

Affiliation:

1. Grupo Zoología Invertebrados, Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Mar del Plata (UNMdP), Dean Funes 3250, 7600 Mar del Plata, Argentina

2. Grupo Estresores Múltiples en el Ambiente, Instituto de Investigaciones Marinas y Costeras (IIMyC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Mar del Plata (UNMdP), Dean Funes 3250, 7600 Mar del Plata, Argentina

3. Univ Montpellier, MARBEC (UM-CNRS-IRD-IFREMER), Montpellier, France

Abstract

To understand the response of freshwater organisms to rising environmental salinity, it is essential to investigate their osmo-ionic regulatory physiology. Our laboratory experiment investigated the transfer of Palaemon argentinus (Nobili, 1901) from 2‰ (control condition) to concentrated salinity (15 and 25‰) for short- (6 h), medium- (48 h), and long-term (>504 h) acclimation periods. We measured relevant parameters in the shrimp’s haemolymph, the time course of the response of branchial V–H+–ATPase (VHA), Na+, K+–ATPase (NKA), carbonic anhydrase (CA) activity, and muscle water content. Upon prolonged acclimation to 15‰ (hyper-regulating condition), shrimp reached a new steady state of haemolymph osmolality by tightly adjusting ion concentrations to levels higher than the external medium. While NKA and CA activities recovered their pre-transfer levels, the downregulation of VHA suggests other functions rather than ion uptake after prolonged acclimation to 15‰. The activity of the three transport-related enzymes remained almost unchanged at the highest salinity (isosmotic condition), leading to increasing osmotic pressure and ion concentration after prolonged acclimation to 25‰. Although the freshwater shrimp studied here retains a certain degree of tolerance to high salinity, a common trait in palaemonid shrimps, our results highlight that 25‰ represents a significant hypertonic challenge for this species.

Publisher

Canadian Science Publishing

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Assessment of the physiological performance of the invasive oriental shrimp Palaemon macrodactylus from an atypical marine population;Journal of Experimental Zoology Part A: Ecological and Integrative Physiology;2024-06-27

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