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Table 2 Density of the Sabellaria tubes at each sampling date obtained by (1) using a visual counting technique; and, (2) evaluating in thin sections

From: The sedimentary dynamics of Sabellaria alveolata bioconstructions (Ostia, Tyrrhenian Sea, central Italy)

Sampling date

The Sabellaria tube density (1) (tubes/m2)

The Sabellaria tube density (2) (tubes/m2)

September 2013

21,450 ± 800

157,100 ± 42,000

March 2014

28,325 ± 900

43,000 ± 14,600

June 2014

24,500 ± 900

61,000 ± 7200

August 2014

34,800 ± 1100

71,600 ± 5300