6 research outputs found
Patterns of diatom treatment in two coexisting species of filter-feeding freshwater gastropods
To assess trophic partitioning among sympatric gastropod species in ancient lakes, we
quantified diatoms in the guts of two coexistent Baikal gastropod species and tested for
differences in species, size, and fracturing of large and small diatoms by taenioglossan
radulae. In May 2010, the diatom Synedra acus dominated the littoral
phytoplankton and gut contents of Baicalia turriformis and
Teratobaikalia ciliata (Baicaliidae), both inhabiting the rocky Baikal
littoral. In laboratory experiments, both ctenidial filter-feeding gastropods were fed
with two diets of cultivated Synedra acus of different cell sizes:
>150 μm and <100 μm. Field and laboratory
studies revealed intact diatom cells (often with green chromatophores) and fragmented
frustules of diatoms <60
μm in the
guts of both species. The two baicaliids varied in the number of ingested microalgae. In
addition, they exhibited significantly different efficiencies for breaking large diatoms;
B. turriformis broke large diatoms into more fragments than T.
ciliata. The differences in the utilization of large and small diatoms by
gastropods are discussed in terms of the relationships among coexisting species. Small
diatom survival is considered from the view of interactions between producers and their
consumers in the freshwater food web
Patterns of diatom treatment in two coexisting species of filter-feeding freshwater gastropods
To assess trophic partitioning among sympatric gastropod species in ancient lakes, we
quantified diatoms in the guts of two coexistent Baikal gastropod species and tested for
differences in species, size, and fracturing of large and small diatoms by taenioglossan
radulae. In May 2010, the diatom Synedra acus dominated the littoral
phytoplankton and gut contents of Baicalia turriformis and
Teratobaikalia ciliata (Baicaliidae), both inhabiting the rocky Baikal
littoral. In laboratory experiments, both ctenidial filter-feeding gastropods were fed
with two diets of cultivated Synedra acus of different cell sizes:
>150 μm and <100 μm. Field and laboratory
studies revealed intact diatom cells (often with green chromatophores) and fragmented
frustules of diatoms <60
μm in the
guts of both species. The two baicaliids varied in the number of ingested microalgae. In
addition, they exhibited significantly different efficiencies for breaking large diatoms;
B. turriformis broke large diatoms into more fragments than T.
ciliata. The differences in the utilization of large and small diatoms by
gastropods are discussed in terms of the relationships among coexisting species. Small
diatom survival is considered from the view of interactions between producers and their
consumers in the freshwater food web