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SUMMARY:Fishy fluid mechanics and impossible ecologies - Pierre Haas\, Max
  Planck Institute of Complex Systems\, Max Planck Institute of Molecular C
 ell Biology and Genetics
DTSTART:20231129T130000Z
DTEND:20231129T140000Z
UID:TALK206491@talks.cam.ac.uk
CONTACT:Marco Vona
DESCRIPTION:The formation of complex tissues during development relies on 
 robust \nspatiotemporal coordination of mechanical forces between differen
 t \ntissues or in complex geometries. In the first part of this talk\, I w
 ill \nshow how this interplay of tissues and forces underpins the first \n
 folding event in the developing zebrafish forebrain [1]. I will develop \n
 a minimal fluid mechanical model of tissue flows during zebrafish \ngastru
 lation to identify the minimal set of spatiotemporally varying \nforce sin
 gularities required and sufficient to reproduce the observed \ntissue flow
 s qualitatively and quantitatively\, respectively. I will then \ndiscuss h
 ow we have tested these predictions in vitro\, highlighting how \nour comb
 ined experimental and theoretical results show how the \ncoordination of d
 ifferent mechanical processes in different tissues is \nrequired for corre
 ct folding of the zebrafish forebrain.\n\nIdentifying the principles that 
 determine stability of coexistence in \necological communities is an etern
 al problem of theoretical ecology. In \nthe second part of this talk\, I w
 ill develop a new approach to this \nquestion: I will analyse all networks
  of competitive\, mutualistic\, and \npredator-prey interactions of N≤5 
 species by random sampling of \ninteraction strengths to reveal that the p
 robabilities of stable \ncoexistence can vary over many orders of magnitud
 e even in ecologies \nthat differ only in the network arrangement of ident
 ical ecological \ninteractions. I will also uncover the role of very rare 
 "impossible" and \n"irreducible" ecologies in determining the possibility 
 of stable \ncoexistence. Overall\, this stresses the importance\, compared
  to mere \nstatistical trends\, of the full structure of the network of in
 teractions \nfor stability of coexistence in ecological communities.\n\n[1
 ] A. Inman\, J. E. Lutton\, E. Spiritosanto\, M. Tada\, T. Bretschneider\,
  \nP. A. Haas\, and M. Smutny\, biorxiv:2023.06.21.545965v1 (2023)\n\n[2] 
 Y. Meng\, Sz. Horvát\, C. D. Modes\, and P. A. Haas\, arXiv:2309:16261 \
 n(2023)
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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