Does salinity have an influence on the diversity and structure of the wintering waterbirds of the Saharan wetlands in Algeria?

Enregistrements de données

Les données de cette ressource occurrence ont été publiées sous forme d'une Archive Darwin Core (Darwin Core Archive ou DwC-A), le format standard pour partager des données de biodiversité en tant qu'ensemble d'un ou plusieurs tableurs de données. Le tableur de données du cœur de standard (core) contient 232 enregistrements.

Cet IPT archive les données et sert donc de dépôt de données. Les données et métadonnées de la ressource sont disponibles pour téléchargement dans la section téléchargements. Le tableau des versions liste les autres versions de chaque ressource rendues disponibles de façon publique et permet de tracer les modifications apportées à la ressource au fil du temps.

Versions

Le tableau ci-dessous n'affiche que les versions publiées de la ressource accessibles publiquement.

Comment citer

Les chercheurs doivent citer cette ressource comme suit:

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/10.15470/6fqd0h

Droits

Les chercheurs doivent respecter la déclaration de droits suivante:

L’éditeur et détenteur des droits de cette ressource est Museu de Ciències Naturals de Barcelona. Ce travail est sous licence Creative Commons Attribution (CC-BY) 4.0.

Enregistrement GBIF

Cette ressource a été enregistrée sur le portail GBIF, et possède l'UUID GBIF suivante : 20eb55d9-e808-4ae1-af7a-172a3358f926.  Museu de Ciències Naturals de Barcelona publie cette ressource, et est enregistré dans le GBIF comme éditeur de données avec l'approbation du GBIF Spain.

Mots-clé

Waterbirds; Sahara; Wetlands; Salinity; Algeria; Occurrence; Occurrence

Contacts

Couverture géographique

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.

Couverture taxonomique

Pas de description disponible

Couverture temporelle

Données sur le projet

Wetlands are reservoirs for biodiversity, providing habitats for large numbers of waterbirds (Sebastián-González and Green 2014; Cherkaoui et al., 2015, 2017). However, data on wetlands at the southern border of the Mediterranean in North Africa, especially those in inland areas, (Hamza and Selmi, 2018) have received little attention and data are lacking. Many North African wetlands, nevertheless, are recognized as Important Bird Areas and appear to play a crucial role as wintering and breeding sites for a wide range of waterbirds (Bensaci et al., 2013; Cherkaoui et al., 2015; Hamza and Selmi 2015; Cherkaoui et al., 2017). The distribution of birds throughout the wetland area is related to the biological and ecological criteria characteristic of both the species and the site (Houhamdi, 1998; Houhamdi and Samraoui, 2002). Understanding the relationships between species richness and environmental factors is fundamental for better management and conservation (Donald et al., 2002; Kosicki and Chylarecki, 2012). The physico-chemical parameters of wetlands (salinity, PH, temperature, oxygen levels, mineralization and conductivity) influence the choice of feeding, resting and breeding sites for many species of waterfowl. Our present study focuses on the possible influence of water salinity on the distribution and structure of the aquatic avifauna of Saharan wetlands. Salinity is a structuring parameter in the biology of aquatic organisms (Green and Figuerola, 2003; Kushlan, 1993). Various waterbird communities have been observed along the salinity gradient (Ysebaert et al., 2000), particularly in arid conditions, thus influencing the choice of feeding, resting and breeding sites for many species of aquatic birds. Salinity could therefore be an indicator of these characteristics of the environment. Waterbirds are sensitive to changes in salinity. The ability of large numbers of waterbirds to profitably use saline lakes basically depends on concentrations of invertebrate fauna (Senner et al., 2018). Waterbird use of these arid-land wetlands throughout the annual cycle depends on physiological adaptations that take advantage of abundant saline wetland-derived prey. These adaptations are linked to metabolism, digestion, and osmosis. Newly-hatched waterbirds, for example, must be raised near fresh water as they do not yet have a well-developed salt gland to cope with heavy salt loads (Haig et al., 2019). To our knowledge, this is the first study in this area to relate salinity, a distinctive physicochemical parameter in these wetlands, with the distribution of wintering waterbirds. It should be noted that the Oued Righ Valley was the subject of a single sampling study in which 53 waterbird species of all statuses were recorded by Bensaci et al. (2013).

Les personnes impliquées dans le projet:

Méthodes d'échantillonnage

The field study was conducted during two wintering periods (2017-2018 and 2018- 2019). Thirty-three visits totaling approximately 230 hours were made. Counts were carried out by direct observation of different waterbird species using a telescope (KITE SP 82 ED) and binoculars. An exhaustive count of individuals was carried out when the distance was less than about 200 m and the number of individuals was less than 200. When the group was greater than 200 individuals or if it was at a remote distance, we proceeded by dividing the visual field into several bands, counting the number of birds in an average band and reported as many times as bands (Blondel, 1975; Tamisier and Dehorter, 1999). All wetlands except Chott Merouane were fully studied. In Chott Merouane, which is very large, we established three stations, covering a total area of about 1,500 hectares.

Description des étapes de la méthode:

1. 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.

Citations bibliographiques

1. 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? Arxius de Miscel·lània Zoològica, 19: 99–111, Doi: https://doi.org/10.32800/amz.2021.19.0099 https://doi.org/10.32800/amz.2021.19.0099

Métadonnées additionnelles