Spatial variation in stable isotopic composition of organic matter of macrophytes and sediments from a small Arctic lake in west Greenland

Figures & data

Table 1. Morphometric characteristics of EVV Upper lake (from Cadieux et al. 2016)

Elevation (m)	l (m)	b (m)	A (ha)	V (m^3)	Zmax (m)	Zm (m)	L (m)	DL	DV
234	68.4	44.3	0.2	4,212	5.4	1.8	165	1.05	1.0

Note. l = maximum length; b = maximum width; A = surface area; V = lake volume; Z_max = maximum water depth; Z_m = mean water depth; L = shoreline length; D_L = development of shoreline; D_V = development of volume.

Table 2. Limnological properties for EVV Upper lake, including temperature, pH, dissolved oxygen (DO), dissolved organic carbon (DOC), and conductivity during summer 2014

Parameter
Temperature (°C)	Min	6.9
	Med	12.6
	Max	15.1
pH	Min	6.2
	Med	7.3
	Max	8.1
DO (mg L^−1)	Min	2.1
	Med	8.8
	Max	13.6
DOC (mg L^−1)	Min	43.9
	Med	46.0
	Max	75.5
Conductivity (µS cm^−1)	Min	441
	Med	445
	Max	681

Figure 1. Bathymetric map of EVV Upper lake (modified from Cadieux et al. 2016) indicating sampling sites for macrophytes and littoral sediments and profundal sediment core (triangle). Inset of Greenland marking Kangerlussuaq

Figure 2. Composition of pooled tissue samples from dominant macrophyte species: (A) organic carbon isotope value (δ¹³C_org) and (B) carbon-to-nitrogen ratio (C/N). Box plots include mean (small square inside box), median (horizontal line inside box), interquartile range (25th and 75th percentiles as box ends), minimum and maximum (vertical lines), and range from 1st to 99th percentile (X)

Figure 3. δ¹³C_org versus %OC for macrophyte tissues and surface sediments collected from littoral sampling sites. Macrophyte tissues for Eriophorum and Hippuris are presented separately for emergent, submergent, and root portions of each plant collected; for Warnstorfia the leaf/stem tissues were pooled for each sample

Figure 4. Sediment depth profile of δ¹³C_org, δ¹⁵N, %OC, %N, and C/N ratios for the 50 cm profundal sediment core

Figure 5. δ¹³C_org versus site number for Eriophorum- and Hippuris-dominated sites. Data are presented separately for emergent, submergent, and root portions of each plant and for surface sediments collected beneath

Cadieux, S. B., J. R. White, P. E. Sauer, Y. Peng, A. E. Goldman, and L. M. Pratt. 2016. Large fractionations of C and H isotopes related to methane oxidation in Arctic lakes. Geochimica Et Cosmochimica Acta 187:141–55. doi:https://doi.org/10.1016/j.gca.2016.05.004.

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