Influence of invasive Acer negundo leaf litter on benthic microbial abundance and activity in the littoral zone of a temperate river in Lithuania | Knowledge and Management of Aquatic Ecosystems

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Table 2

Microbial abundance in the bottom sediments of littoral sites of the River Neris, 2013–2014 (mean values ± SD). TNB − total number of bacteria; HB − heterotrophic bacteria; CDB − cellulose decomposing bacteria; SRB − sulfate reducing bacteria; TFung − terrestrial fungi. Different letters in a row indicate significant differences among sites for each parameter (ANOVA test with Tukey HSD, p ≤ 0.05).

Leaf accumulation zone	Microorganisms

	TNB, 10⁶/g	HB, 10³ CFU/g	CDB, 10³ CFU/g	SRB, CFU/dm³	TFung, CFU/g
26–28 March
A. negundo	158.0 ± 2.4^a	20.1 ± 2.2^a	8.7 ± 1.8^a	10⁵	9700 ± 818^a
A. glutinosa	136.0 ± 7.0^b	12.5 ± 0.5^b	7.0 ± 0.5^ab	10⁵	5933 ± 404^b
Zone without leaf litter	96.5 ± 8.7^c	6.5 ± 1.0^c	2.9 ± 0.3^c	10³	570 ± 61^c

31 July–2 August
A. negundo	182.5 ± 30.7^a	218.0 ± 10.3^a	69.5 ± 26.0^a	10⁶	1753 ± 129^a
A. glutinosa	187.2 ± 23.3^ab	204.2 ± 16.1^ab	62.2 ± 34.7^a	10⁵–10⁶	420 ± 79^b
Zone without leaf litter	126.3 ± 21.1^c	133.7 ± 21.1^c	36.0 ± 19.0^a	10³	180 ± 27^c

16–17 October
A. negundo	217.8 ± 29.0^a	133.0 ± 13.5^a	46.0 ± 28.0^a	10⁶	1253 ± 115^a
A. glutinosa	191.6 ± 65.1^ab	114.5 ± 7.0^b	30.0 ± 16.0^ab	10⁵–10⁶	1587 ± 247^ab
Zone without leaf litter	156.1 ± 12.2^bc	88.0 ± 27.0^bc	13.2 ± 6.2^c	10³	153 ± 38^c

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