Table 13.

Average dissimilarities (SIMPER) between seasons spring (March to May), summer (June–August), autumn (September to November) and winter (December to January) based on average abundance and percentage contribution of benthic macroinvertebrate during study period. Figures in italics indicate organisms with 10% contribution to the total counts

Summer and autumn average dissimilarity = 64.77	Contribution (%)	Spring and winter average dissimilarity = 60.75	Contribution (%)
Chironomidae	10.58	Baetidae	9.67
Gammaridae	9.72	Chironomidae	9.3
Heptageniidae	7.28	Gammaridae	8.54
Ephemerellidae	6.76	Heptageniidae	8.49
Baetidae	6.71	Tubificidae	8.4
Tubificidae	6.6	Tipulidae	7.98
Lumbriculidae	5.44	Lumbriculidae	7.4
Leuctridae	4.65	Simulidae	6.07
Hydropsychidae	4.39	Hydropsychidae	5.41
Asselidae	4.05	Asselidae	5.03
Lumbricidae	3.74	Paediciidae	4.63
Tipulidae	3.65	Lumbricidae	4.48
Erpobdellidae	3.34	Erpobdellidae	4.45
Limnephilidae	3.02	Rhyacophilidae	3.52
Paediciidae	3
Rhyacophilidae	2.85
Dytiscidae	2.4
Perlodidae	2.08
Spring and summer average dissimilarity = 59.57	Contribution (%)	Spring and autumn average dissimilarity = 58.59	Contribution (%)
Chironomidae	8.98	Chironomidae	13.11
Heptageniidae	8.61	Heptageniidae	10.38
Tubificidae	8.6	Gammaridae	9.79
Gammaridae	8.4	Tubificidae	7.74
Lumbriculidae	5.99	Lumbriculidae	7.34
Baetidae	5.87	Tipulidae	6.79
Ephemerellidae	5.79	Baetidae	6.36
Tipulidae	5.34	Asselidae	6.23
Lumbricidae	5.08	Hydropsychidae	4.56
Asselidae	4.68	Lumbricidae	4.3
Rhyacophilidae	3.43	Erpobdellidae	4.24
Simulidae	3.41	Paediciidae	4.03
Erpobdellidae	3.29	Simulidae	2.85
Paediciidae	3.07	Rhyacophilidae	2.18
Leuctridae	3	Leuctridae	1.86
Perlodidae	2.72
Limnephilidae	2.7
Hydropsychidae	2.58