Changes in Water Quality in Hudson River Wetlands

	A	B
1	Changes in Water Quality in Hudson River Wetlands
2	About the Data

3	Data Source	Stuart Findlay, Cary Institute of Ecosystem Studies. Data were published in Findlay & Fischer. 2013. Ecosystem attributes related to tidal wetland effects on water quality. Ecology, 94(1): 117-125.
4	Dataset Timeframe	June through September in 2008 and 2009.
5	Data Collection Location	Freshwater tidal marshes of the Hudson River estuary. For this data, four different wetlands were surveyed that span the Hudson River Estuary. Iona Island is in Stony Point, NY, Rogers Point is in Hyde Park, NY, Vanderburgh Cove is north of Mills Norrie State Park, and Athens South Marsh is in Athens, NY.
6	Data Collection Methods	Seventeen wetlands were studied. Vegetation cover was organized into 10 classes from aerial photography. Water quality sampling took place from June through September in 2008 and 2009. A YSI Sonde was placed in each study site to measure dissolved oxygen, temperature, pH, turbidity, water depth, and conductivity every 15 minutes over a two-week neap-spring tidal cycle. Some water samples were collected over a 24-hour period using an auto-sampler to look at additional water quality parameters, like nitrate-nitrogen.
7	Data Notes	Graminoid vegetation (GV) is the taller vegetation class in the marsh, consisting of cattails and common reed.
8	Iona Marsh: Nitrate Data	Iona Marsh is a wetland with lots of graminoid vegetation. The nitrate-nitrogen levels over a 24-hour time period are shown here, along with water levels, or tidal stage in meters.
9	Roger's Point: Nitrate Data	Roger's Point is a wetland that doesn't have a lot of graminoid vegetation. The nitrate-nitrogen levels over a 24-hour time period are shown here, along with water levels, or tidal stage in meters.
10	Vanderburgh (Shallows Spring Tide): DO Data	Dissolved oxygen at the Vanderburgh Cove marsh over one week, the site with the most submerged aquatic vegetation of all the sites sampled in this study.
11	Athens (South Neap Tide): DO Data	Dissolved oxygen at Athens South marsh, a site with low levels of submerged aquatic vegetation.
12	Vegetation Types	Vegetation types at Iona marsh, Rogers Point, Vanderburgh Cove, and Athens South. Graminoid (tall) vegetation, broadleaf (found in the middle zone of the marsh, includes arrowhead, pickerelweed, spatterdock, etc), and submerged aquatic vegetation (always underwater).
13	Dataset Heading	Data Description
14	Date	Day of which sample was collected (dates span June through September in 2008 and 2009).
15	Time	Time at which sample was collected
16	Depth	How deep water was sampled, measured in meters (m)
17	% DO (dissolved oxygen)	Dissolved oxygen can also be reported as a measure of how saturated the water is (water can only hold so much oxygen). The percent indicates the saturation level.
18	DO (dissolved oxygen) mg/L	Dissolved oxygen can be reported in either milligrams per liter (mg/L) or parts per million (ppm). 1 mg/L is equal to 1 ppm.
19	Day/Night	When data was collected.
20	Nitrate-N (mg/L)	The amount of nitrate in the water. Nitrate-N (or NO3-N) stands for “nitrate as nitrogen,” which means this is a test for nitrate (which has 1 nitrogen atom and 3 oxygen atoms in it), but the concentration units are being reported as nitrogen only.
21	Ammonium-N (mg/L)	The amount of ammonia in the water. Ammonium-N (or NH3-N) stands for nitrogen-ammonia, which means this is a test for ammonium (which has 1 nitrogen atom and 3 hydrogen atoms in it), but the concentration units are being reported as nitrogen only.
22	TN-N (mg/L)	The total amount of nitrogen in the water. This variable encompasses nitrogen in nitrate (NO3), nitrite (NO2), and ammonia (NH3).
23	Graminoid vegetation	Herbaceous plants that are structured similarly to grasses. It is usually tall and includes cattails and common reed.
24	Broadleaf vegetation	Found in the middle zone of the marsh. It includes arrowhead, pickerelweed, spatterdock, etc.
25	Submerged aquatic vegetation	Vegetation that is always underwater.
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100