Abstract:
:Understanding how water and solutes enter and propagate through freshwater landscapes in the Anthropocene is critical to protecting and restoring aquatic ecosystems and ensuring human water security. However, high hydrochemical variability in headwater streams, where most carbon and nutrients enter river networks, has hindered effective modelling and management. We developed an analytical framework informed by landscape ecology and catchment hydrology to quantify spatiotemporal variability across scales, which we tested in 56 headwater catchments, sampled periodically over 12 years in western France. Unexpectedly, temporal variability in dissolved carbon, nutrients and major ions was preserved moving downstream and spatial patterns of water chemistry were stable on annual to decadal timescales, partly because of synchronous variation in solute concentrations. These findings suggest that while concentration and flux cannot be extrapolated among subcatchments, periodic sampling of headwaters provides valuable information about solute sources and subcatchment resilience to disturbance.
journal_name
Ecol Lettjournal_title
Ecology lettersauthors
Abbott BW,Gruau G,Zarnetske JP,Moatar F,Barbe L,Thomas Z,Fovet O,Kolbe T,Gu S,Pierson-Wickmann AC,Davy P,Pinay Gdoi
10.1111/ele.12897subject
Has Abstractpub_date
2018-02-01 00:00:00pages
296-308issue
2eissn
1461-023Xissn
1461-0248journal_volume
21pub_type
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