Erratum to: Environ Sci Pollut Res

DOI 10.1007/s11356-015-4776-0

The following errors have been detected in figures 4 and 5 and table 3. They represent issues of style but they have no influence on the results.

In table 3 the list of identified taxa in the studied sites was replaced by:

Achnanthes lanceolata (Brébisson) Grunow var. lanceolata

Bacillaria paradoxa Gmelin

Brachysira neoexilis Lange-Bertalot

Cyclotella meneghiniana Kützing

Diploneis sp.

Diploneis separanda Lange-Bertalot

Discostella pseudostelligera (Hustedt) Houk & Klee

Eunotia exigua (Brébisson ex Kützing) Rabenhorst

Gomphonema parvulum (Kützing) Kützing var. parvulum

Navicula gregaria Donkin

Navicula halophila (Grunow) Cleve

Navicula veneta Kützing

Navicula sp.

Nitzschia amphibia Grunow f. amphibia

Nitzschia palea (Kützing) W. Smith

Nitzschia cf. thermalis (Kützing) var. minor Hilse

Pinnularia acidophila Hoffman & Krammer

Pinnularia aljustrelica Luis, Almeida & Ector

Pinnularia acoricola Hustedt var. acoricola

Pinnularia subcapitata Gregory var. subcapitata

In Fig. 4. Dominant and sub-dominant diatom taxa in different pH ranges, the list of taxa was replaced by:

Discostella pseudostelligera (Hustedt) Houk & Klee

Achnanthes lanceolata (Brébisson) Grunow var. lanceolata

Cyclotella meneghiniana Kützing

Bacillaria paradoxa Gmelin

Diploneis sp.

Gomphonema parvulum (Kützing) Kützing var. parvulum

Navicula gregaria Donkin

Navicula halophila (Grunow) Cleve

Navicula veneta Kützing

Navicula sp.

Nitzschia amphibia Grunow f. amphibia

Nitzschia cf. thermalis Kützing var. minor Hilse

Eunotia exigua (Brébisson ex Kützing) Rabenhorst

Diploneis separanda Lange-Bertalot

Brachysira neoexilis Lange-Bertalot

Pinnularia subcapitata Gregory var. subcapitata

Pinnularia aljustrelica Luis, Almeida & Ector

Pinnularia acidophila Hofmann & Krammer

Pinnularia acoricola Hustedt var. acoricola

Fig. 5 was replaced by a new figure with the following caption:

Fig. 5 Images of diatoms obtained under the light microscope (Zeiss Axioplan 2 Imaging). Scale Bar 10 μm.

1-3 Pinnularia aljustrelica Luis, Almeida & Ector

4-5 Pinnularia acidophila Hofmann & Krammer

6 Pinnularia aff. acoricola Hustedt var. acoricola

7-8 Nitzschia palea (Kützing) W. Smith

9 Nitzschia cf. thermalis Kützing var. minor Hilse

10-11 Pinnularia aff. subcapitata Gregory var. subcapitata

12 Cyclotella meneghiniana Kützing

13 Discostella pseudostelligera (Hustedt) Houk & Klee

14 Navicula veneta Kützing

15 Navicula gregaria Donkin

16 Nitzschia amphibia Grunow f. amphibia

Fig. 5
figure 1