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