Overview of the most abundant taxa (≥ 1% relative abundance in at least one sample). 78 Gomphonema exilissimum 79 Gomphonema parvuliforme 80Gomphonema cf. parvuliforme81 Gomphonema parvulum 82 Gomphonema lagenula 83Gomphonema cf. lagenula84Gomphonema aff. sarcophagus85Gomphonema aff. mariovense86 Gomphonema subclavatum 87 Gomphonema stonei 88 Gomphonema pumilum 89 Gomphonema graciledictum 90 Gomphonema naviculoides 91 Gomphonema minusculum 92 Gomphonema sp. 4 93 Gomphonema sp. 2 94 Gomphonema innocens 95Gomphonema aff. parvulius96 Nitzschia desertorum 97 Nitzschia semirobusta 98 Nitzschia inconspicua 99 Nitzschia sp. 1 100 Nitzschia supralitorea 101Nitzschia cf. hantzschiana102 Nitzschia fonticola 103 Nitzschia perminuta 104 Surirella angusta 105 Nitzschia acicularis 106 Nitzschia amphibia 107 Nitzschia communis 108 Nitzschia gracilis 109 Nitzschia paleacea 110 Nitzschia intermedia 111 Nitzschia palea 112Nitzschia palea var. tenuirostris113Nitzschia palea var. debilis114 Nitzschia balcanica 115 Nitzschia linearis 116 Epithemia sorex 117 Epithemia adnata. Scale bar 10 μm.