Early recolonization of a dredged lowland river by dragonflies (Insecta: Odonata) | Knowledge and Management of Aquatic Ecosystems

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Table 1

Characteristics of sampling sites before and after dredging.

Site	Parameters

	Flow [m s⁻¹]		Depth [m]		Bottom sediments		Plants [%]		Shade

	Before	After	Before	After	Before	After	Before	After	Before	After
D0/1^⁎	0.500	0.460–0.510	0.7	0.7	g, st	g, st	0	0	None	None
D0/2^⁎	0.010	0.002–0.020	0.5	0.5	sa, si, m	sa, si, m	70	50–70	Partial	Partial
D1/1	0.013	0.090–0.160	0.4	0.5	m	sa, g	30	0–10	None	None
D1/2	0.010	0.002–0.010	0.2	0.2	si, m	sa, si, m	90	0–40	Partial	None
D2/1	0.020	0.010–0.050	0.2	0.5	si, m	si, m	90	0–10	Partial	None
D2/2	0.002	0.001–0.002	0.1	0.2	m	m	100	0–40	Partial	None
D3/1	0.020	0.020–0.050	0.3	0.5	si, m	sa, si, m	20	0–10	Partial	None
D3/2	0.002	0.001–0.002	0.1	0.2	m	sa, si, m	80	0–40	Partial	Partial
D4/1^⁎	0.140	0.090–0.200	0.5	0.5	sa, g	sa, g	0	0	Partial	Partial
D4/2^⁎	0.003	0.001–0.003	0.2	0.2	sa, m	sa, m	70	30–70	Partial	Partial
D5/1	0.001	0.001–0.003	0.5	0.7	m	m	40	0–40	Partial	None
D5/2	0.040	0.030–0.060	0.5	1.0	m	m	30	0–20	None	None

^⁎

Control sites (undredged); river bottom sediments: g − gravel, st − stones, sa − sand, si − silt, m − mud.

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