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CATEGORIES:Lecture/Presentation/Talk
DESCRIPTION:Characterizing the dynamics of marine communities and their res
 ponses to disturbances\n\nMarine ecological communities face numerous distu
 rbances\, some of which are becoming stronger and more frequent due to clim
 ate change. These range from chronic “press” disturbances\, such as warming
  and pollution\, to acute “pulse” disturbances\, such as heatwaves and stor
 ms. Characterizing the population dynamic responses to these stressors has 
 been a daunting task\, given the dynamical complexity of multispecies commu
 nities and the limited mathematical and computational tools to address this
  complexity. I will present quantitative approaches that I have recently de
 veloped to overcome this challenge and will illustrate how they can be appl
 ied to natural communities. First\, I will examine the issue of predicting 
 species abundance fluctuations following a regime shift triggered by a pres
 s disturbance. I will show that by integrating abundance time series and th
 e disturbance driver into a nonparametric model\, we can reveal how abundan
 ces will fluctuate under unobserved conditions. Leveraging data from a lake
  plankton community and a California fishery\, I will illustrate how this a
 pproach identifies disturbance thresholds that lead to abrupt population sh
 ifts. Next\, I will address the problem of predicting species abundance amp
 lification following a pulse disturbance. I will introduce a theory that qu
 antifies this amplification when the undisturbed community exhibits complex
  population dynamics\, such as transients or cycles. Using data from marine
  rocky intertidal and phytoplankton communities\, I will show that the pote
 ntial for abundance amplification can change over time\, leading to seasona
 l windows of high vulnerability. Overall\, this research creates new possib
 ilities to explain and anticipate the responses of ecological communities t
 o a changing ocean.
DTEND:20260212T183000Z
DTSTAMP:20260307T113506Z
DTSTART:20260212T171500Z
GEO:37.42816;-122.175935
LOCATION:Y2E2 Building\, 292A (CIFE Classroom)
SEQUENCE:0
SUMMARY:Oceans Department Seminar - Lucas Medeiros
UID:tag:localist.com\,2008:EventInstance_51825769434435
URL:https://events.stanford.edu/event/oceans-department-faculty-search-semi
 nar-lucas-medeiros
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