Potential carbon sources for the head-down deposit-feeding polychaete <I>Heteromastus filiformis</I>

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ID: 300864
1993
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Abstract
In this study we investigated potential carbon sources for the capitellid polychaete, Heteromastusfiliformis. It is a head-down deposit feeder ingesting sediment from at least 15 cm below the sediment-water interface. This orientation appears to minimize the worm’s ability to acquire food and oxygen and maximize its exposure to sulfide. The food sources we examined were metabolically active bacteria, benthic algae, detritus and chemoautotrophic bacteria. Carbon retention efficiencies from metabolically active bacteria, benthic algae and detritus by H. jilifomis were 26%, 8% and 4% respectively. These values are relatively low compared to other deposit feeding species suggesting that H. jiliformis does not possess unique digestive capabilities. Rubisco (Ribulose bisphosphate carboxylase) assays were negative, which indicates an absence of symbiotic chemoautotrophic bacteria in tissue or absorbed carbon. Average 6 13C were -12.83 for worms and -20.70 for 15 cm sediment, which indicates that external gardening of chemoautotrophs is not a major carbon source for H. filiformis. Nevertheless, several experiments showed that this capitellid worm had an unusually high gross heterotrophic COZ uptake. We suggest that H. jiliformis utilizes both dissolved and particulate carbon sources stored within anoxic and sulfidic sediments that are not utilized by other deposit feeding organisms.
Reference Key
openalex_W1970930189 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lisa M. Clough, Glenn R. Lopez
Journal journal of marine research
Year 1993
DOI
10.1357/0022240933224052
URL
https://doi.org/10.1357/0022240933224052
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