Fig. 3: Terrestrial support of different aquatic consumers in 35 boreal lakes.
From: The role of land use in terrestrial support of boreal lake food webs
The lakes cover a marked environmental gradient (PC1) from highly forested, high DOC lakes to nutrient-rich lakes in agricultural landscape. The consumers’ reliance on terrestrial sources are estimated with the MixSIAR Bayesian isotopic mixing model comparing δ2H values of consumers to those of terrestrial and aquatic (within-lake) basal resources. Medians and 95% credible intervals of the consumer allochthony are indicated as curves and shaded areas and the lake- and consumer-specific estimates as points and whiskers, respectively. Non-overlapping 95% credible intervals indicate significant shifts in consumer allochthony along the environmental gradient. The trend in global average consumer allochthony is presented in a1. The consumer groups zooplankton (a2–5), zoobenthos (b1–5), and fish (c1–d5) are presented in different columns, with subscript numbers indicating size categories of the fish and text inside the brackets indicating habitats (a, b) or feeding guilds (c, d) of consumer groups. The pie charts with a legend in top show proportions of different prey categories found in the fish stomach contents (averaged across the study lakes). Source data are provided as a Source Data file.
