10:15 - MAUMEE RIVER POTAMOPLANKTON
: CYANO-BACTERIA AND THEIR TOXICITY.
Water flow is the main hydrological factor determining the phytoplankton structure (named potamoplankton
, in rivers), mainly because it can act on numerous environmental factors controlling the community dynamics (Reynolds, 2000).
: paradigms, paradoxes and prognoses.
In large rivers like the Lower Mississippi River (LMR), abiotic features, such as discharge and light, are usually considered the major factors influencing the biomass and composition of potamoplankton
. Because large rivers are often turbid, nutrient limitation is thought rarely to be an issue.
Clearly [p.sub.i] = 1 if i is a species that lives suspended in water (potamoplankton
) sand [p.sub.i] would be close to zero for any organism so tightly attached to the stones that it could only be detached with great difficulty, or one capable of swimming against the current.
Most rotifer species that occurred exclusively in the pre-impoundment phase are littoral and frequently associated with river potamoplankton
(Paggi and Jose de Paggi, 1990).
Although primary production is minimal in such streams, the algal contribution represents the inocula for the potamoplankton
in high-order streams.
Keywords: lotic ecosystem, potamoplankton, Iguacu River.
Frequently, the potamoplankton density is inversely proportional to the river's discharge owing to the dilution and the physical changes caused by the intense flux, which is one of the factors that alters the rivers' turbulence (Zalocar de Domitrovic et ah, 2007).
Keywords: spatial heterogeneity, functional groups, potamoplankton, reservoirs, seasonality.
High densities of potamoplankton have been recorded in eutrophic rivers during periods of lower discharge and slower water flow (Grabowska and Mazur-Marzec, 2011).
, defined as phytoplankton in rivers (Reynolds, 2006), consists of species originated from these environments and with the ability to grow and reproduce entirely in the main canal, forming dominant populations, especially along the intermediary sections (Vannote et al., 1980).