INVESTIGADORES
BOLTOVSKOY Demetrio
capítulos de libros
Título:
Nutrient recycling, phytoplankton grazing, and associated impacts of Limnoperna fortunei
Autor/es:
BOLTOVSKOY DEMETRIO; CORREA NANCY; SYLVESTER FRANCISCO; CATALDO DANIEL
Libro:
Limnoperna fortunei: the ecology, distribution and control of a swiftly spreading invasive fouling mussel
Editorial:
Springer International Publishing
Referencias:
Lugar: Cham; Año: 2015; p. 153 - 176
Resumen:
Abstract Laboratory and field experiments indicate that the presence of Limnoperna
fortunei decreases concentrations of particulate organic matter and increases ammonia,
nitrate, and especially phosphate. Long-term series of field data partially confirm
these results. After having been colonized by the mussel, a 47 km2 reservoir
developed higher concentrations of ammonia and phosphates, a higher P:N ratio,
more transparency, less seston, and less phytoplankton and primary production.
Phytoplankton clearance rates by the mussel vary widely, suggesting that ?normal?
values for adult organisms are around 100 mL/ind./h, or ca. 2?4 mL/mg DW/h.
Data on grazing selectivity are inconclusive, but seem to indicate highest impacts
on small (< 1 mm) particles. Large plankton are negatively selected, but they may
account for greater proportions of total biomass in the diet. Studies on consumption
of toxic cyanobacteria yield conflicting results, but large golden mussel populations
significantly enhance blooms of colonial Microcystis spp. through changes
in nutrient availability, size-selective grazing, promotion of colony formation, and
reduced grazing of toxic cells. These toxic blooms, in turn, suppress reproduction
of the mussel, most probably killing the larvae. Growth of periphyton and aquatic
macrophytes are enhanced significantly by the golden mussel.