Effects of cyanobacterium
Microcystis aeruginosa
on the filtration rate and
mortality
of the freshwater bivalve Corbicula leana
Soon-Jin Hwang1,
Ho-Sub Kim2, Jung-Hwan Park1 and Baik-Ho
Kim*1
1Department of
Environmental Science, Konkuk
University, Seoul
143-701, Republic
of Korea
2Han
River Environmental Research
Laboratory, National Institute of Environmental Research, Gyeonggi
476-823, Republic
of Korea
(Received: September 22, 2008; Revised
received: April
15, 2009; Accepted: May 18, 2009)
Abstract: We compared filtering rates (FR) and
mortalities between freshwater filter-feeding bivalve Corbicula
leana acclimatized (AM) and non-acclimatized (NAM) to an cyanobacterial bloom (mainly Microcystis aeruginosa) over
seven days. Both mussel populations were simultaneously stocked into mesocosms constructed in littoral zones of a eutrophic lake at a density of 740 ind. m-2 for 16 days. NAMs
decreased the concentration of chlorophyll-a 50% less than AMs.
For the first seven days, the FRs (0.46~0.61) and
mortality rate (slope = -30.2, r = -0.95) of NAMs were
higher than those of AMs, possibly due to a sudden
increase in unselective filtering. From the eighth day, NAM mortality
decreased rapidly and then stabilized, becoming similar to that of AMs through the end of the experiment. Stocking both AMs and NAMs increased the NH4-N
concentration in the water, and the mortality rates of both mussel populations
were correlated with NH4-N. In contrast, other nutrients and microcystin concentrations? were not significantly associated with
mussel mortality. These results indicate that although a sudden introduction of
non-acclimatized C. leana may partially control
phytoplankton biomass for a short period, previous short-term acclimatization
is needed to minimize mussel mortality.
Key words: Freshwater bivalve, Corbicula
leana, Cyanobacteria,
Filtration rate, Mortality
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