Good link, lots of heavy data, and looks like recent data has made some of the info I've offered obsolete
but I pulled these two paragraphs from the paper that I think are worth reading for those who didnt make it down that far:
"Our synopsis of the multiple lake comparison over a 10-year period, then, is that P.
parvum blooms (and annual population maxima for the period after early-spring 2007)
were recurrent winter phenomena in this area of the south-central USA. Bloom initiation
and development only occurred at a time of year when inflows were low, and large fishkilling
blooms occurred only when salinity was higher. Bloom termination followed high
inflow events, likely through direct flushing of cells and indirect physiological affects.
This linkage between incidence of P. parvum blooms, inflows and salinity raises concern
because sequestration of water continues to increase in this area with rising human
population. Combined with variations in precipitation and evaporation predicted from
climate change, flows in this area may decrease by 60% (Cai and McCarl, 2009).
Though not the focus of climate change models, it is likely that increased evaporation
rates associated with regional warming will also result in higher salinity. Consequently,
both human population increase and climate change may lead to an increased incidence
of P. parvum blooms........(later in the report)..This study underscores the importance of hydraulic flushing as a mechanism terminating
P. parvum blooms in lakes of the south-central USA. In the decades to come, it is likely
that the magnitude of lake-flushing events will decrease as human populations expand
and the number of water impoundments increases. The effects of decreased through-flow
might be exacerbated by climate change as well, as precipitation patterns alter. It may be
that the affects of reduced through-flows and likely persistence of blooms can be offset
by management efforts aimed at altering other factors influential to P. parvum bloom
dynamics. For example, blooms might be mitigated by localized fertilization in areas
where blooms develop in attempts to prevent toxin production (Barkoh et al. 2003,
Grover et al. 2007, Roelke et al. 2007, Errera et al. 2008), promoting growth of
phytoplankton that can suppress P. parvum through allelopathy (Grover et al. 2010,
Roelke et al. 2010), manipulations of pH to negate the potency of toxins (Valenti et al.2010), or introduction of natural predators and pathogens (Schwierzke et al. 2010). There
is much understanding still to be gained, however, before effective management of P.
parvum in lakes of the south-central USA can be implemented."
