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SUMMARY:The effect of a maturation time on plankton patchiness generated b
 y chaotic stirring - Alexandra Tzella\, Atmospheric Dynamics Group\, DAMTP
 \, U. Cambridge
DTSTART:20070807T100000Z
DTEND:20070807T110000Z
UID:TALK7587@talks.cam.ac.uk
CONTACT:Ryan Woodard
DESCRIPTION:The observed filamental nature of plankton populations suggest
 s that stirring plays an important role in determining their spatial struc
 ture. Considering a flow where the fluid parcel trajectories are chaotic\,
  and neglecting diffusion\, the concentrations of different biological spe
 cies within a fluid parcel are then determined by its time history.\n\nThe
  induced spatial structure has been shown to be a result of competition be
 tween the rate of convergence of the biological processes involved and the
  rate of divergence of the distance of neighbouring fluid parcels. It has 
 also been argued (except under rather special conditions)\, that the small
  scale behaviour should be the same for all interacting species (Neufeld e
 t al. 1999). However\, Abraham et al. (1998)\, by introducing a biological
 ly more relevant maturation time into the evolution equations\, presented 
 results that show different small-scale spatial structures for different s
 pecies (specifically different structures for zooplankton and phytoplankto
 n).\n\nThis talk will present both theoretical and numerical results expla
 ing the effect of a maturation time on the scaling behaviour of  biologica
 lly active species\, such as plankton\, advected by a chaotic flow.\n\nAle
 xandra's "home page":http://www.atmos-dynamics.damtp.cam.ac.uk/people/at23
 8/\n
LOCATION:British Antarctic Survey\, Room 330B
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