Figure Legends

Figure 1. Map of Ethiopia with Tigray National Regional State highlighted in grey (A). Districts of Tigray National Regional State with location of the reservoirs sampled from each district indicated in star (B). Names of reservoirs: MES = Meskebet; MDI = Mai-Dimu; MAZ = Mihtsab Azmati; Laelay Maichew Cluster (LMC): Mai Nigus (MNG) and Mai Seye (MSY); MSS = Mai Sessela; DBD = Dibdibo; AAS = Adi Asma’e; Ganta-afeshum Cluster (GAC): Bokoro (BOK), Dibla (DIB) and Enda Gabriel (EGA); TSI = Tsinkanet ; RUF = Ruba Feleg; TEG = Teg’hane; Wukro cluster (WUC): Laelay Wukro (LWK) and Korir (KOR); MLE = Mai Leba; GBE = Gereb Beati ; HWC = Hintalo Wajerat Cluster (HWC): AGE = Adi Gela; AKE = Adi Kenafiz; BET = Betequa; DAM = Dur Anbasa; GMI = Gereb Mihiz; GSE = Gum Selassa; HAI = Haiba; MDE = Mai Delle; MGI = Mai Gassa I; MGII = Mai Gassa II; MEA = Meala; SHI = Shilanat IV and Enderta Cluster (EDC): HAS = Hashenge; ADA= Adi Amharay; HWD = Hizaeti Wedi Cheber; EQU = Era Quihila; GAW = Gereb Awso
Figure 2. Principal components analysis biplot of the reservoirs characteristics with overlaid clustering results. MES = Meskebet; MDI = Mai-Dimu; MAZ = Mihtsab Azmati; MNG = Mai Nigus; MSY = Mai Seye; MSS = Mai Sessela; DBD = Dibdibo; AAS = Adi Asma’e; BOK = Bokoro; DIB = Dibla; EGA = Enda Gabriel; TSI = Tsinkanet ; RUF = Ruba Feleg; TEG = Teg’hane; LWK = Laelay Wukro; KOR = Korir; MLE = Mai Leba; GBE = Gereb Beati ; AGE = Adi Gela; AKE = Adi Kenafiz; BET = Betequa; DAM = Dur Anbasa; GMI = Gereb Mihiz; GSE = Gum Selassa; HAI = Haiba; MDE = Mai Delle; MGI = Mai Gassa I; MGII = Mai Gassa II; MEA= Meala; SHI = Shilanat IV; HAS = Hashenge; ADA = Adi Amharay; HWD = Hizaeti Wedi Cheber; EQU = Era Quihila and GAW = Gereb Awso
Figure 3. Avian taxonomic richness of waterbirds from 35 reservoirs in Tigray National Region state. Solid shaded black bars indicate number of genera per family while striped-bars indicate species richness per family. Families along the X-axis are arranged according to their, English ABC, alphabetical order.
Figure 4. Specie richness (α diversity) of the respective reservoir investigated during the study period (A) and the pattern of species richness of waterbird populations inhabiting reservoirs sampled in Tigray (B). The species richness with respect to geographic location of the reservoirs is plotted along X-Y coordinates; the size of the circle is proportional to species richness of each reservoir
Figure 5. Venn diagram illustrating the results of variation partitioning from the partial redundancy analysis (pRDA) of the bird species composition of along an age of gradient of reservoirs in Tigray National Regions State, Northern Ethiopia. The pRDA shows the unique and shared contribution of biological descriptors (BV), environmental heterogeneity (ENV), and approximate age (AGE) of reservoir (AGE) to the variation in bird species composition observed in the reservoirs. A) Results of the pRDA based on two variables; B) pRDA with three variables: ENV, BV and AGE as independent variables. The numbers in the Venn diagram represent the fraction of variation in species composition that is explained by each independent variable. Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05
Figure 1