Table 1.

Description of sampling sites in Lao PDR: names of river, geographical coordinates of sampling sites (i.e., latitude and longitude in degrees, WGS 1984), sampling dates during field surveys in March and July 2016, and regular monitoring from July 2017 to December 2018, and catchment drainage area in km².

Sampling sites	River	Geographical coordinatesa		Sampling dates	Catchment area (km2)
		Latitude (°)	Longitude (°)
Nou	Nam Ou	20.08642	102.26406	2016 2017–2018b	25,946
Nsu	Nam Suang	19.97931	102.24728	2016 2017–2018b	6577
Npa	Nam Pa	19.96049	102.28289	2016	758
MK_17	Mekong	19.89224	102.13416	2016 2017–2018b	27,215,525
Nk20	Nam Khan	19.78601	102.18335	2016	7236
A6	Houay Khan	19.76009	102.18112	2016	239
Nmi	Nam Mi	17.91917	101.68856	2016	1021
Nsa	Nam Sang	18.22284	102.14222	2016	1210
Ntho	Nam Thôn	18.09152	102.28159	2016	582
Nlik	Nam Lik	18.63280	102.28104	2016	3022
Nng_3	Nam Ngum	18.52502	102.52631	2016	8366
Nng_4	Nam Ngum	18.35581	102.57204	2016	14,318
Nng_2	Nam Ngum	18.20269	102.58588	2016	14,985
Nng_1	Nam Ngum	18.17879	103.05593	2016	16,841
Nma	Nam Mang	18.37017	103.19838	2016	1793
Ngn	Nam Gniep	18.41756	103.60217	2016	4564
Nxa	Nam Xan	18.39523	103.65408	2016	2223
Nka	Nam Kadin	18.32517	103.99924	2016	14,820
Nhi	Nam Hin Boun	17.72699	104.56798	2016	2152
Xbi	Xe Bang Fai	17.07782	104.98496	2016	9433
Xbg	Xe Bang Hieng	16.09804	105.37625	2016	19,817
Xbn	Xe Bang Nouan	16.00290	105.47937	2016	1351
SR	Nam Sedon	15.12390	105.80748	2016	7225
MK_1	Mekong	19.95601	102.24113	2016	26,388,036
MK_7	Mekong	17.89870	101.62397	2016	29,524,569
MK_2	Mekong	17.97276	102.50410	2016	30,182,592
MK_3	Mekong	17.39714	104.79999	2016	37,336,797
MK_4	Mekong	16.00503	105.42449	2016	41,709,405
MK_5	Mekong	15.10721	105.79878	2016	54,905,479

^aGeographical coordinates in degrees (WGS 1984).

^bSampling frequency of 10-days interval.