Legendre, L. Laval University, firstname.lastname@example.org
Rassoulzadegan, F. Station Zoologique, email@example.com
STABLE VERSUS UNSTABLE PLANKTONIC FOOD WEBS IN OCEANS
It is hypothesised that the multivorous and microbial food webs generally dominate marine pelagic waters. This hypothesis is tested using data from a wide range of marine environments and trophic conditions. The first step consists in computing the matching between production and losses of phytoplankton (M). The frequency distribution of M in oceans is dominated by values close to one, which indicates that there generally is a tight coupling between net phytoplankton production and losses (i.e. consumption and sinking). In a second step, frequency distributions of several ecological variables are constructed for three classes of M values. Analysis of these distributions indicates that M * 1 generally correspond to dominance by the herbivorous food web, and M = 1, to dominance by the multivorous and the microbial food webs. It follows that the prevalence of values M = 1 in oceans supports the above hypothesis. Using data from another study, it is further concluded that, in most oceans and most of the time, ca. 60 to 80% of the phytoplankton production is respired in the euphotic zone, ca. 20 to 30% is transferred to the pelagic food web, and ca. 10% is exported downwards.
Day: Wednesday, Feb. 3
Time: 11:00 - 11:15am
Location: Hilton of Santa Fe