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<p>Bivalves are considered mainly filter-feeding organisms; they remove suspended particles including phytoplankton, zooplankton, and bacteria from the water column. Moreover, some bivalves can also feed via pedal-feeding, which is the uptake of organic matter from the sediment using cilia on the foot. <i>Diplodon parallelopipedon</i> is a native bivalve from South America, which can obtain their food by both feeding mechanisms. This work aimed to determine the relative importance of two food sources on <i>D. parallelopipedon</i> biomass: organic matter from the sediment and seston of the water column. Stable isotope analysis (δ<sup>13</sup>C/δ<sup>15</sup>N) was performed on two locations with lower/higher organic matter content. We used Bayesian mixing models to determine the relative contribution of the two food sources to the biomass of <i>D. parallelopipedon</i> in each location. We used isotopic values of a filter-feeding bivalve <i>Limnoperna fortunei</i> as an integral signal of seston. For pedal-feeding, we used isotopic values of <i>Campsurus violaceous.</i> Both signals reflect isotopic variability at a larger temporal scale. Our results suggest that the biomass of <i>D. parallelopipedon</i> derives largely from the organic matter of sediments.</p>

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Filtration and pedal-feeding contribution to the biomass of the freshwater bivalve Diplodon parallelopipedon: evidence from stable isotopes analysis

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Soledad Marroni,
  • Franca Stábile,
  • Ivan González-Bergonzoni,
  • Franco Teixeira de Mello,
  • Néstor Mazzeo,
  • Carlos Iglesias

摘要

Bivalves are considered mainly filter-feeding organisms; they remove suspended particles including phytoplankton, zooplankton, and bacteria from the water column. Moreover, some bivalves can also feed via pedal-feeding, which is the uptake of organic matter from the sediment using cilia on the foot. Diplodon parallelopipedon is a native bivalve from South America, which can obtain their food by both feeding mechanisms. This work aimed to determine the relative importance of two food sources on D. parallelopipedon biomass: organic matter from the sediment and seston of the water column. Stable isotope analysis (δ13C/δ15N) was performed on two locations with lower/higher organic matter content. We used Bayesian mixing models to determine the relative contribution of the two food sources to the biomass of D. parallelopipedon in each location. We used isotopic values of a filter-feeding bivalve Limnoperna fortunei as an integral signal of seston. For pedal-feeding, we used isotopic values of Campsurus violaceous. Both signals reflect isotopic variability at a larger temporal scale. Our results suggest that the biomass of D. parallelopipedon derives largely from the organic matter of sediments.