Physico-chemical thresholds in the distribution of fish species among French lakes | Knowledge and Management of Aquatic Ecosystems

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Table 1

Codes, units and distribution characteristics of the environmental variables considered in the analysis. For variables having annual variations (lines below Zmax), the first code corresponds to the annual median, the codes ending by “min” and “max” are the minimal and maximal annual values, respectively.

Parameters	Codes	Units	Minimum	Median	Maximum
Latitude	lat	°N	42	45.8	50.1
Longitude	lon	°E	-4.2	2.3	9.5
Altitude	alt	m	1	265	2061
Lake surface area	Surf	km²	1.1	1.91	57.6
Maximal depth	Zmax	m	0.8	17.7	145
Temperature − euphotic zone	Temp	°C	9.1	16.4	22.2
	Tempmin	°C	1.1	6.0	18.6
	Tempmax	°C	12.3	21.8	27.1
Temperature − bottom	TempB	°C	4.1	11.3	20.0
	TempBmin	°C	0.3	5.4	14.2
	TempBmax	°C	4.2	16.6	27
Secchi depth	Secchi	m	0.2	1.8	7.5
	Secchimin	°C	0.1	1	6.7
O₂ saturation − euphotic zone	SatO2	%	57	95	154
	SatO2min	%	15	75	107
O₂ saturation − bottom	SatO2B	%	0	45	114
	SatO2Bmin	%	0	1	94
Alkalinity	Alk	meq·L⁻¹	0.1	0.9	4.6
pH	pH	–	6.2	8.0	9.2
	pHmin	–	5.1	7.4	8.4
	pHmax	–	6.5	8.6	10.7
Conductivity	Cond	μS·cm⁻¹	16	245	791
Dissolved organic carbon	DOC	mg·L⁻¹	0.4	4.5	22.2
	DOCmax	mg·L⁻¹	0.6	5.7	38
Nitrates	NO3	μg·L⁻¹	126	1900	42 200
	NO3max	μg·L⁻¹	410	5200	72 000
Ammonia	NH4	μg·L⁻¹	6	50	461
	NH4max	μg·L⁻¹	21	150	2450
Nitrites	NO2	μg·L⁻¹	4	24	260
	NO2max	μg·L⁻¹	6	60	940
Phosphates	PO4	μg·L⁻¹	6	16	515
	PO4max	μg·L⁻¹	6	40	1590
Total phosphorus	TP	μg·L⁻¹	6	27	425
	TPmax	μg·L⁻¹	10	45	1410
Dissolved silicon	SiO2	mg SiO₂·L⁻¹	0.2	3.4	20.8

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