BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:EESS talk on "Dissolved oxygen provides insights into regime shift
 s and headwater network behavior"
DTSTART:20210223T121500
DTEND:20210223T130000
DTSTAMP:20260510T215949Z
UID:794f0a5c873546ed1cf6bd93066ec9426d7200ea3ef4cc7de0b6e096
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Jake Diamond\, postdoctoral researcher\, RiverLy research u
 nit\, EcoFlows Team\, INRAe Lyon and University of Tours\, FR\nAbstract:\n
 Aquatic ecosystem recovery from anthropogenic degradation can be hampered 
 by internal feedbacks that stabilize undesirable states. The challenges of
  managing and predicting alternative states in lakes are well known\, but 
 state shifts in rivers and their attendant effects on ecosystem function r
 emain understudied despite strong recent evidence that such shifts can and
  do occur. Using three decades of measurements of key state variables such
  as turbidity\, nutrient concentrations\, Corbicula fluminea clam densitie
 s\, and chlorophyll a\, including hourly dissolved oxygen\, we investigate
 d a sudden shift from phytoplankton to macrophyte dominance in the middle 
 Loire River (France)\, and its associated effects on the rivers metabolic 
 regime. We show that despite large and synchronous shifts across all state
  variables\, changes in gross primary production and ecosystem respiration
  were modest (25% and 14% declines\, respectively) and that these shifts l
 agged the ecosystem state changes by a decade or more. The shift to a macr
 ophyte-dominated state reduced the sensitivity of primary production to ab
 iotic drivers\, altered element cycling efficiency\, flipped the net carbo
 n balance from positive to negative\, and\, crucially\, weakened the tempo
 ral coupling between production and respiration. This weakened coupling\, 
 detected using Granger causality\, increased the temporal autocorrelation 
 of net ecosystem production\, yielding a robust early warning indicator of
  both state- and metabolic-shifts that may provide valuable guidance for r
 iver restoration. We also present an exploration of headwater network patt
 erns of dissolved oxygen.\n\nShort biography:\nJake was born in Florida\, 
 USA\, spending his youth in the swamps\, marshes\, rivers\, springs\, and 
 beaches of his homestate. He maintained his interest in aquatic ecosystems
  during his undergraduate and master’s studies at the University of Flor
 ida\, after which he spent time working in industry and state government i
 n Salt Lake City\, Utah. He then completed a PhD in ecohydrology at Virgin
 ia Tech before arriving at his current position as a research associate at
  INRAE in Lyon\, France.\n 
LOCATION:ZOOM https://epfl.zoom.us/j/84677261593
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR