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CATEGORIES:College of Arts and Sciences,Lectures and Seminars
DESCRIPTION:Giant kelp forests are highly productive, and their canopy biom
 ass turns over several times a year, but patches separated by only a few h
 undred meters within a single forest can grow and decline out of phase wit
 h one another.  I will show how separating physical drivers from demograp
 hic processes helps account for that variability. Reconstructing seawater 
 nitrate from its nonlinear relationship with temperature resolves nutrient
  exposure at time scales that routine water sampling misses, and pairing t
 hose estimates with remotely sensed canopy pigment content (Chl:C) shows t
 hat kelp physiological condition responds to both nitrate and light and ge
 nerally predicts subsequent biomass gain. Within a single forest, however,
  the same signal arises from the intrinsic senescence of individual fronds
  rather than from the physical environment, with canopy condition and fron
 d survivorship declining together as a cohort ages. I will close with new 
 work using the timing and magnitude of peaks in satellite-derived canopy b
 iomass to infer cycles of cohort growth and senescence within kelp populat
 ions, evaluated against diver-based demographic surveys.\nEvent page: http
 s://www.umassd.edu/events/cms/10-9-26-biology-department-seminar---tom-bel
 l.php
X-ALT-DESC;FMTTYPE=text/html:<html><body><p>Giant kelp forests are highly p
 roductive\, and their canopy biomass turns over several times a year\, but
  patches separated by only a few hundred meters within a single forest can
  grow and decline out of phase with one another.  I will show how separat
 ing physical drivers from demographic processes helps account for that var
 iability. Reconstructing seawater nitrate from its nonlinear relationship 
 with temperature resolves nutrient exposure at time scales that routine wa
 ter sampling misses\, and pairing those estimates with remotely sensed can
 opy pigment content (Chl:C) shows that kelp physiological condition respon
 ds to both nitrate and light and generally predicts subsequent biomass gai
 n. Within a single forest\, however\, the same signal arises from the intr
 insic senescence of individual fronds rather than from the physical enviro
 nment\, with canopy condition and frond survivorship declining together as
  a cohort ages. I will close with new work using the timing and magnitude 
 of peaks in satellite-derived canopy biomass to infer cycles of cohort gro
 wth and senescence within kelp populations\, evaluated against diver-based
  demographic surveys.</p><p>Event page: <a href="https://www.umassd.edu/ev
 ents/cms/10-9-26-biology-department-seminar---tom-bell.php">https://www.um
 assd.edu/events/cms/10-9-26-biology-department-seminar---tom-bell.php</a><
 /a></p></body></html>
DTSTAMP:20261005T214812
DTSTART;TZID=America/New_York:20261009T120000
DTEND;TZID=America/New_York:20261009T125000
LOCATION:SENG 113
SUMMARY;LANGUAGE=en-us:Biology Department Seminar - Tom Bell
UID:40185ef9ea5ec10bd265310b362ee6eb@www.umassd.edu
END:VEVENT
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