Abstract
Larval settlement of the infaunal spionid polychaetes Polydora cornuta and Streblospio benedicti is mediated by sediment-associated microorganisms. To investigate if larval preference for certain sediment is guided by individual sediment-associated bacteria, 13 bacterial isolates (5 phyla) obtained from the natural habitat of adult polychaetes (Wadden Sea, Germany) in 2008 were screened in still-water, no-choice settlement assays. Two isolates (α-Proteobacterium-Strain DF11 and Flavobacterium-Strain 54) significantly triggered larval settlement in comparison with sterile sediment. In still-water, multiple-choice settlement assays comprising natural and sterile sediment and sediment re-inoculated with isolates DF11 and 54, significant preferences for natural sediment and sediment containing bacterial isolates at 108 cells g−1 were observed. Larval settlement was influenced by bacterial abundance in sediment but the correlation was not strictly positive; thus, maximum larval settlement in response to single bacterial species may occur at certain optimum densities. Non-viable or suspended bacteria and water-soluble bacterial products did not induce larval settlement, suggesting that sediment-associated bacterial settlement cues for P. cornuta and S. benedicti were either produced in situ and/or consisted of heat-labile bacterial products.
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Acknowledgments
We are grateful to PY Qian and co-workers at the Hong Kong University of Science and Technology and D Fischer and R Gahl-Janssen at the University of Oldenburg for assistance in the sequencing of bacterial isolates. This study was supported by a grant of the German Research Foundation to T. Harder (HA 3496/1-2). The authors would like to thank the anonymous reviewers for their valuable comments.
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Communicated by J. P. Grassle.
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Sebesvari, Z., Neumann, R., Brinkhoff, T. et al. Single-species bacteria in sediments induce larval settlement of the infaunal polychaetes Polydora cornuta and Streblospio benedicti . Mar Biol 160, 1259–1270 (2013). https://doi.org/10.1007/s00227-013-2178-8
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DOI: https://doi.org/10.1007/s00227-013-2178-8