Figure 1 - Study area with sampling sites
Figure 2- Boxplots of the indices derived from the RHS application in
2005 and 2020. The bottom and top of each box are the 25th and 75th
percentiles, the line in the middle is the median, whiskers go from the
end of the interquartile range to the furthest observation within 1.5
times the interquartile range. HQA = Habitat Quality Assessment HMS =
Habitat Modification Score LRD= Lentic Lotic River Descriptor.
Figure 3 – Comparison between climatic data in the years 1999-2005 and
2014-2020. Maximum air temperature a) summer monthly data b) winter
monthly data; c) average monthly rainfall (data source: Arpa Piemonte
www.arpa.piemonte.it ). Errors bars are standard deviations.
Figure 4 – Comparison between 2005 and 2020 diatom community indices.
Boxplots from d) to g) show the most common European diatom indices:
IPS= Indice de Polluosensibilité Specifique (Coste, 1982); ICMi=
Intercalibration Common Metric Index (Mancini and Sollazzo, 2009); TI=
Trophic Index (Rott et al., 1999). Boxplot statistical limits as in
Figure 2.
Figure 5 – Comparison between 2005 and 2020 macroinvertebrate community
indices. IBE= Italian Biotic Index (Ghetti, 1997). Boxplot statistical
limits as in Figure 2 BMWP, ASPT, IBE, N families, N taxa, N EPT
families, % stenocious taxa
Figure 6 – Graphical result of the NMDS displaying samples based on the
diatom matrix.
Figure 7 - Contribution to diatom community β-diversity. a) LCBD for
2005 and 2020; b) SCBD of each diatom species; c) LCBD of sampling
sites. Species with SCBD<0.02 were not included. Boxplot
statistical limits as in Figure 2. LCBD= Local Contribution to β
Diversity; SCBD= Species Contribution to β Diversity.
Figure 8 - Contribution to macroinvertebrate community β-diversity. a)
LCBD for 2005 and 2020; b) SCBD of each taxon; c) LCBD of sampling
sites. Boxplot statistical limits as in Figure 2. LCBD= Local
Contribution to β Diversity; SCBD= Species Contribution to β Diversity.