Abstract.
Sediment reworking due to burrowing and feeding was studied in the spatangoid Brissopsis lyrifera, at two different temperatures (7°C and 13°C). Spine activity and burrowing behaviour were recorded with a real-time video camera. Reworked sediment volume was calculated from tracks produced by the heart urchin. Ingestion rates were measured by feeding the heart urchins with luminophores. Temperature had a significant effect on the bioturbation activity of B. lyrifera. At 13°C reworked sediment volume due to burrowing was 22 ml sediment h–1 and at 7°C 14 ml sediment h–1. The ingested amount of sediment was 0.08 and 0.02 g dry sediment h–1 in 13 and 7°C, respectively. Reworked sediment volume due to burrowing was 60–150 times higher than the volume ingested. The large reworked volume is a consequence of B. lyrifera moving with a rocking motion through the sediment. The spines were continuously transporting sediment around the test with 5-min metachronal wave cycles.
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Hollertz, .K., Duchêne, .JC. Burrowing behaviour and sediment reworking in the heart urchin Brissopsis lyrifera Forbes (Spatangoida). Marine Biology 139, 951–957 (2001). https://doi.org/10.1007/s002270100629
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DOI: https://doi.org/10.1007/s002270100629