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DTSTAMP:20260424T143326Z
UID:643e62277f39e734004067@ist.ac.at
DTSTART:20230503T123000
DTEND:20230503T133000
DESCRIPTION:Speaker: Lisa Shama\nhosted by Beatriz Vicoso\nAbstract: Ocean 
 climates are changing rapidly and marine organisms must either acclimate o
 r adapt to survive. Identifying how organisms cope with ocean warming\, in
 creasing temperature variability and extreme events like marine heatwaves 
 is important for predicting consequences for populations\, and ultimately\
 , biodiversity. Using a series of common garden experiments\, we investiga
 ted the influence of directional warming (+1.5C and +4C)\, increased tempe
 rature variability and heatwaves on marine stickleback (Gasterosteus acule
 atus) phenotypic variation\, and assessed the roles of within-generation (
 WGP) and transgenerational plasticity (TGP)\, bet hedging and epigenetic m
 echanisms in adaptive potential. We consistently found that exposure to +4
 C had detrimental effects on offspring growth compared to ambient conditio
 ns. Yet\, offspring of mothers acclimated to +4C reached larger sizes at +
 4C via TGP in response to predictable environmental cues of future conditi
 ons\, with optimised gene expression inherited from mothers underlying tra
 nsgenerational benefits. Comparing transcriptomes of parents (eggs/sperm) 
 and embryos across development\, we showed that massive changes to the epi
 genetic landscape occurred at +1.5C in the blastula stage\, potentially re
 flecting a key window of opportunity for adaptive epigenetic responses to 
 near-future climate change. Exposing parents to fluctuating environments (
 predictably variable or stochastic)\, however\, led to maternal bet hedgin
 g strategies (diversified and conservative\, respectively) to cope with fu
 ture environment uncertainty. Yet\, when parents were exposed to natural o
 r increased temperature variation\, we did not detect evidence for bet hed
 ging of offspring size\, but global DNA methylation increased with increas
 ing variability\, suggesting a possible link between methylation and plast
 icity. Taken together\, our studies show that marine stickleback employ mu
 ltiple adaptive strategies both within and across generations to cope with
  rapidly changing ocean conditions.
LOCATION:Office Bldg West / Ground floor / Foyer seminar room (I21.EG.128)\
 , ISTA
ORGANIZER:apal@ist.ac.at
SUMMARY:Lisa Shama: &quot\;Non-genetic&quot\; sources of phenotypic variati
 on: transgenerational plasticity\, bet hedging and epigenetic mechanisms i
 n marine stickleback
URL:https://talks-calendar.ista.ac.at/events/4144
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