Combined effects of two abiotic stressors (salinity and temperature) on a laboratory-simulated population of Daphnia longispina

Abstract

Sea level rise is expected to continue apace, with a concomitant rise in temperature on the globe's surface. Natural populations genetic pool compromised by increased salinity would contribute to decrease resilience under future temperature changes. Therefore, this work aimed to understand the long-term effects of salinization on the genetic diversity of a cladoceran-simulated laboratory population under different temperature regimes. For that, six clonal lineages of the cladoceran Daphnia longispina were chosen based on their reported differential lethal sensitivity (LCx) to salinity. The chronic experiment was initiated when each individual clonal lineage reached the population’s carrying capacity, and then were exposed to the LC70,48 h for the most tolerant clonal lineage of D. longispina (corresponding to 5.91 mS/cm) to 17°C, 20°C and 23°C for at least 30 days. Salinity affected D. longispina survival and reproduction, with the disappearance of salt-tolerant earlier than salt-sensitive lineages after chronic exposures. Different sensitivity ranks were observed for clonal lineages when comparing short-term and chronic survival, most probably due to acclimation-driven population recovery. Non-optimal tested temperatures (17°C and 23°C) enhanced negative effects of salinity through loss of the most sensitive clonal lineages, suggesting a potential future synergistic effect between both abiotic factors.

Morpho-Physiological and Biochemical Responses of <i>Cymbopogan citratus</i> (DC.) and <i>Asparagus officinalis</i> L. to Waterlogging and Salinity Stress

“…Globally, 20% of irrigated land is salt-affected and this extent is considered to increase up to 50% by 2050 owing to excessive use of chemicals, unsustainable agricultural practices and climate change [Aksoy et al, 2022]. Salinity stress causes damage to crop production through a substantial increase in the concentration of soluble salts [Seleiman et al, 2023;Venâncio et al, 2023]. Salinity poses a serious threat to global food security because of its harmful effects on plants [Alkharabsheh et al, 2021;Mukhopadhyay et al, 2021].…”

Putting the Asymmetric Response Concept to the test: modeling multiple stressor exposure and release in a stream food web

“…The use of road salt contributes to salinization (Kaushal et al, 2005). Prolonged summer droughts associated with climate change may additionally lead to salinization through groundwater incursions in coastal systems (IPCC, 2021; Venâncio et al, 2023).…”

Nano-Management Approaches for Salt Tolerance in Plants under Field and In Vitro Conditions

“…The rising salinity in soil and water is considered a serious threat to global agricultural productivity, especially in arid and semi-arid regions [1], which account for more than 833 million ha, or 8.7% of the global soils [2]. Salinity stress represents a vital abiotic stress that causes significant damage to agro-production due to the high accumulation of soluble salts, mainly sodium chloride (NaCl), in soil and water [3,4]. Global food security could be strongly linked with salinity risk due to the detrimental effects of salt on all plant processes (i.e., physiological, morphological, and biochemical attributes) and decreasing the production of food [5,6].…”