Table 2.

Summary of water chemistry measurements for surface water samples collected at field sites in Alaska, Minnesota and Louisiana.

wetland complex—field site	samples type	date of initial sample collection	pH at initial measure	specific conductance (µS/cm) at initial measure	date of second sample collection/recoverya	pH at second measure/upon recovery	specific conductance (µS/cm) at second measure/upon recovery
Izembek NWR, Alaska Bluebill Lake	filtered	29 Aug 2018	7.58	84	14 Apr 2019	5.25	74
Izembek NWR, Alaska Bluebill Lake	unfiltered	29 Aug 2018	7.21	84	14 Apr 2019	6.39	74
Izembek NWR, Alaska Red Salmon Lake	filtered	4 Sep 2018	7.55	96	14 Apr 2019	5.67	87
Izembek NWR, Alaska Red Salmon Lake	unfiltered	4 Sep 2018	7.39	94	14 Apr 2019	5.65	85
Agassiz NWR, Minnesota Farmes Pool	filtered	9 Sep 2018	8.04	607	28 Apr 2019	6.54	549
Agassiz NWR, Minnesota Farmes Pool	unfiltered	9 Sep 2018	7.75	615	28 Apr 2019	6.86	242
Agassiz NWR, Minnesota Tamarack Pool	filtered	9 Sep 2018	8.42	527	28 Apr 2019	5.48	472
Agassiz NWR, Minnesota Tamarack Pool	unfiltered	9 Sep 2018	8.09	534	28 Apr 2019	7.38	248
Cameron Parish, Louisiana Private rice field	filtered	15 Nov 2018	6.10	279	23 Mar 2019	5.77	274
Cameron Parish, Louisiana Private rice field	unfiltered	15 Nov 2018	6.26	304	23 Mar 2019	4.86	75
Cameron Parish, Louisiana Rockefeller Wildlife Refuge	filtered	15 Nov 2018	6.60	1166	23 Mar 2019	5.99	1058
Cameron Parish, Louisiana Rockefeller Wildlife Refuge	unfiltered	15 Nov 2018	6.14	1189	23 Mar 2019	4.95	1534

^aFor unfiltered surface water samples, this date reflects the date of collection. For filtered water samples, this reflects the date that 250 ml sample bottles (filled on ‘date of initial sample collection') were recovered from perforated steel drums submerged within field sites.