Does salinity have an influence on the diversity and structure of the wintering waterbirds of the Saharan wetlands in Algeria?Acronym: MCNB-Khirani-Betrouche-and-Moulaï-2021
Between 2017 and 2019, 42 species of wintering waterbirds were recorded in the wetland complex of the Oued Righ valley in the Algerian Sahara. The intersite amplitudes of salinity explained the variations in species richness and distribution of waterbirds in the various wetlands studied. Oligohaline (0.5-5 ‰) and mesohaline (5-18 ‰) environments, represented by Lake Ayata, Lake Sidi Khelil and Oued Kherouf, were the most favorable to Anatidae with the exception of the Tadornes where their presence was noted in the euhaline (30-40 ‰) and hyperhaline stations (> 40 ‰). The presence of the Greater Flamingo Phoenicopterus roseus and the Slender-billed Gull Chroicocephalus genei stood out in the most holomorphic areas of the complex, such as Chott Merouane.
The eco-complex of the Oued Righ Valley wetlands in the Algerian Sahara is one of the most important wetland complexes in Algeria. This Saharan depression constitutes a wintering area that is favorable for the aquatic avifauna of the western Palearctic and a migratory stopover during the great crossing of the Sahara to reach the sub-Sahelian wetlands.
To calculate wetland salinity, we chose the direct method using a portable optical refractometer with a measuring range of 0-100‰. We analysed a total of eleven stations on the six wetlands and classified these according to the categorization of the salinity of Mediterranean wetlands proposed by Farinha et al. (1996): freshwater < 0.5 ‰, Oligohaline (0.5-5 ‰), Mesohaline (5-18‰), Polyhaline (18-30‰), Euhaline (30-40‰) and Hyperhaline > 40‰.
The salinity was determined during the wintering periods in 11 stations of the Oued Righ wetland complex (table 3). To measure the salinity of stations, we employed the direct method, using a portable optical refractometer with automatic temperature compensation (ATC) from AUTOUTLET with a measuring range from 0 to 100‰.
To determine the affinities and intersite variations according to the different degrees of salinity we carried out a factor analysis of correspondences (AFC). The significance level for statistical analysis is p-value < 0.001.
To determine the affinities and inter-site variations according to the different salinity levels during the monitoring periods, a correspondence factorial analysis was carried out using XLstat version 2016 software. The significance level for statistical analysis was p-value< 0.001.
Type of content
Includes: point occurrence data.
Khirani–Betrouche, F., Moulaï, R., 2021. Does salinity have an influence on the diversity and structure of the wintering waterbirds of the Saharan wetlands in Algeria? Museu de Ciències Naturals de Barcelona. Dataset/Occurrence. https://doi.org/
This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
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