- Keywords: lagoon; hypersaline; salinity increase; ecosystem shift Among ongoing global changes, salinity modification in different water bodies is one of the most influential, affecting the structure, functioning, and dynamics of aquatic ecosystems [1,2,3,4]. This modification may have various causes (natural and anthropogenic) as well as different directions, either increasing or decreasing [5,6,7,8]. The same global change can lead to an increase in salinity in some water bodies and a decrease in others.
- Hydrological connectivity between coastal lagoons and marine water plays a major role in ecosystem health. Natural brackish habitats show an intrinsic spatial dispersion of benthic fauna when free water exchange is guaranteed. Habitat alteration caused by frequent and long-lasting floodgate closing is one of the major reasons for the decline in biological diversity and increased eutrophication of water. This type of disturbance, being a substantial stress (e.g.
- After thirty-one simulation days, the western portion of the lagoon, near the riverine inputs, showed salinities of 50.1 and 45.3 PSU at St6 and St7, respectively (Figure 8), showing that Moas River alone can impress salinity reduction on station St7. Furthermore, station St7 also showed the largest standard deviation (1.75; Figure 8), which indicates that rainfall has a larger effect on its salinity.
Such details provide a deeper understanding and appreciation for Prez Decreasing Lagoon Aqua Deviations Stress.
- A one-dimensional 224Raex/223Ra reactive-transport model was used to quantify water flow between a coastal lagoon (La Palme) and the sea over a 6-month period. Horizontal flow between the lagoon and sea decreased from ~ 85 cm d1 during May 2017 (0.3 m3 d1 m1 of shoreline) to ~ 20 cm d1 in July and was negligible in the summer months thereafter due to a decreasing hydraulic gradient.
As ish communities of coastal lagoons are submitted to constant stress conditions by sporadic or permanent contact with adjacent marine and freshwater environments (Winemiller and Leslie, 1992; Yafez-Arancibia and Nugent, 1997; Caramaschi et al., 2004), the number of resistant species found by this study (23 % of the total) almost reached that found in a previous study (30 %) (Saad et al , 2002).
