PERSONAL DE APOYO
CATALDO Daniel Hugo
artículos
Título:
The invasive bivalve Limnoperna fortunei enhances benthic invertebrate densities in South American floodplain rivers
Autor/es:
FRANCISCO SYLVESTER, DEMETRIO BOLTOVSKOY Y DANIEL CATALDO
Revista:
HYDROBIOLOGIA
Editorial:
Springer
Referencias:
Lugar: Holanda; Año: 2007 vol. 589 p. 15 - 27
ISSN:
0018-8158
Resumen:
We assessed the effects of the introduced
bivalve L. fortunei on the abundance and
biomass of associated benthic invertebrates in
South American large floodplain rivers. The survey
was based on comparisons of L. fortunei-covered
and L. fortunei-barren areas in five artificial cages
from where large predators were excluded, exposed
to colonization by the mussel for a total of 17
months in the lower Parana´ river delta. Accompanying
invertebrates were dominated by Oligochaeta,
Nematoda, Rotifera, Copepoda, Gastropoda,
Hirudinea, Chironomidae and nauplii. Also present
in minor numbers were Tardigrada, Turbellaria,
Cladocera, Ostracoda, Insecta, Hydracarina
and Decapoda. Dominant invertebrates were 27
100% more numerous (and hosted 43100% more
biomass) in areas with L. fortunei than in areas
barren of the mussel. In areas with L. fortunei, total
invertebrate biomass (excluding the bivalve) was
positively correlated with mussel biomass, and
increased with time of exposure under water. No
such trend was observed in areas barren of L.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid watersL. fortunei on the abundance and
biomass of associated benthic invertebrates in
South American large floodplain rivers. The survey
was based on comparisons of L. fortunei-covered
and L. fortunei-barren areas in five artificial cages
from where large predators were excluded, exposed
to colonization by the mussel for a total of 17
months in the lower Parana´ river delta. Accompanying
invertebrates were dominated by Oligochaeta,
Nematoda, Rotifera, Copepoda, Gastropoda,
Hirudinea, Chironomidae and nauplii. Also present
in minor numbers were Tardigrada, Turbellaria,
Cladocera, Ostracoda, Insecta, Hydracarina
and Decapoda. Dominant invertebrates were 27
100% more numerous (and hosted 43100% more
biomass) in areas with L. fortunei than in areas
barren of the mussel. In areas with L. fortunei, total
invertebrate biomass (excluding the bivalve) was
positively correlated with mussel biomass, and
increased with time of exposure under water. No
such trend was observed in areas barren of L.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid watersL. fortunei-covered
and L. fortunei-barren areas in five artificial cages
from where large predators were excluded, exposed
to colonization by the mussel for a total of 17
months in the lower Parana´ river delta. Accompanying
invertebrates were dominated by Oligochaeta,
Nematoda, Rotifera, Copepoda, Gastropoda,
Hirudinea, Chironomidae and nauplii. Also present
in minor numbers were Tardigrada, Turbellaria,
Cladocera, Ostracoda, Insecta, Hydracarina
and Decapoda. Dominant invertebrates were 27
100% more numerous (and hosted 43100% more
biomass) in areas with L. fortunei than in areas
barren of the mussel. In areas with L. fortunei, total
invertebrate biomass (excluding the bivalve) was
positively correlated with mussel biomass, and
increased with time of exposure under water. No
such trend was observed in areas barren of L.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid watersL. fortunei-barren areas in five artificial cages
from where large predators were excluded, exposed
to colonization by the mussel for a total of 17
months in the lower Parana´ river delta. Accompanying
invertebrates were dominated by Oligochaeta,
Nematoda, Rotifera, Copepoda, Gastropoda,
Hirudinea, Chironomidae and nauplii. Also present
in minor numbers were Tardigrada, Turbellaria,
Cladocera, Ostracoda, Insecta, Hydracarina
and Decapoda. Dominant invertebrates were 27
100% more numerous (and hosted 43100% more
biomass) in areas with L. fortunei than in areas
barren of the mussel. In areas with L. fortunei, total
invertebrate biomass (excluding the bivalve) was
positively correlated with mussel biomass, and
increased with time of exposure under water. No
such trend was observed in areas barren of L.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid watersL. fortunei than in areas
barren of the mussel. In areas with L. fortunei, total
invertebrate biomass (excluding the bivalve) was
positively correlated with mussel biomass, and
increased with time of exposure under water. No
such trend was observed in areas barren of L.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid watersL. fortunei, total
invertebrate biomass (excluding the bivalve) was
positively correlated with mussel biomass, and
increased with time of exposure under water. No
such trend was observed in areas barren of L.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid watersL.
fortunei. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid waters. It is suggested that higher invertebrate
growth is associated with enhanced substrate
complexity and, probably, the transfer of organic
matter from the plankton to the sediments due to
the mussels feces and pseudofeces. Some of the
adverse ecosystem-wide effects of filter-feeding
invasive mussels observed in European and North
American water bodies may be offset in the Parana´
by the extremely high loads of organic matter in
these turbid waters