Type: Seminar

Distribution: World

Expiry: 1 Apr 2009

Auth: garethw@asti.maths.usyd.edu.au

Hello SUMS members, Thanks to all those who turned up to SUMS soccer last week. Pure won, but of course this game was only a warm-up for the big one at the end of the year. So really it means nothing. In any case, this week we are returning to talks, and for the first time this year it will be an applied talk. Duncan Sutherland is a PhD student at Sydney Uni, and his talk, titled Kinky Population Dynamics - Modelling sequential hermaphrodite fish, really needs no explanation beyond the abstract (which he kindly provided us, thanks Duncan): "A sequential hermaphrodite fish, such as Wrasse or Clownfish, is born as one sex and later under goes transition to the opposite sex. This is kinky. This talk was originally presented as assessment for the applied maths honours course ’Populations and Disease’. The assignment was to find three papers with a common theme in the area of mathematical biology and present a short talk about them. A continuously structured population model, due to Calsina and Ripoll, will be discussed. The model assumes a random age transition between the sexes. The fecundity (birth) and mortality functions are arbitrary and only restricted by obvious biological considerations. A stage structured population model including the effects of fishing, by Armsworth, will also be discussed. Time permitting, the talk will include discussion of a third paper about optimal breeding stragies for sequential hermaphrodites. The speaker is also available for private parties." Hope to see you there! SUMS also has some other, more general announcements to make, which I will list in point form to make it easier to read: - The website has finally been updated enough for me to not be too ashamed to give you the address: http://www.maths.usyd.edu.au/u/PS/SUMS.html While I still consider it a work in progress, and by no means complete, it is at least up-to-date. - SUMS T-shirts will hopefully be available by the mid-semester break (perhaps a little bit after). There should be enough printed to meet demand. The design will probably be the "Say Pi and die" design that you may have seen other, older SUMS members wear. More details to come later. - There will be a cake bake in week 7 (the first week back from mid-semester break). This will likely be held on a day other than Wednesday, to cater for SUMS members who can’t make it on Wednesdays. More details to come later. - SUMS has been discussing with the Physics Society about a possible Maths vs Physics debate later on in the semester. Any suggestions on possible debate topics would be appreciated (think of interesting topics). Some more details on these events may be provided on Wednesday. In any case, you should come to Duncan’s talk, unless you feel like doing something not nearly as awesome (you DO like awesome things, don’t you?) Talk: Kinky Population Dynamics - Modelling sequential hermaphrodite fish Speaker: Duncan Sutherland Location: Carslaw 452 Date/Time: Wednesday April 1, 1-2pm Until we meet again, SUMS President "Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." - Bertrand Russell

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