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Table 3.

Summary of byssal thread production assays at Bass Rock, RI,USA

Mussel measurements
Environmental conditions
Start dateThread production (day-1)GICI (×10-2 g cm-3)NTemperature (°C)Hs (m)
Oct 23, 2003 4.49±2.42a 0.09±0.05 0.32±0.08 15 14.13 0.59 
Nov 22, 2003 3.25±2.15a 0.08±0.04 0.32±0.07 19 10.64 0.62 
Feb 7, 2004 0.56±0.79b 0.08±0.03 0.41±0.08 19 2.79 0.81 
Feb 17, 2004 0.63±0.67b 0.07±0.02 0.39±0.10 20 2.33 0.69 
Mar 19, 2004 0.93±1.25b 0.12±0.02 0.58±0.10 20 2.88 0.89 
Apr 24, 2004 4.38±3.25a 0.15±0.03 0.79±0.24 16 7.10 0.65 
May 17, 2004 3.66±2.36a 0.08±0.03 0.48±0.12 20 11.45 0.55 
Jun 14, 2004 3.91±2.48a 0.13±0.02 0.52±0.08 19 14.48 0.58 
Jul 12, 2004 3.30±3.17a 0.10±0.02 0.43±0.08 16 18.78 0.83 
ANOVA P<0.001      
Mussel measurements
Environmental conditions
Start dateThread production (day-1)GICI (×10-2 g cm-3)NTemperature (°C)Hs (m)
Oct 23, 2003 4.49±2.42a 0.09±0.05 0.32±0.08 15 14.13 0.59 
Nov 22, 2003 3.25±2.15a 0.08±0.04 0.32±0.07 19 10.64 0.62 
Feb 7, 2004 0.56±0.79b 0.08±0.03 0.41±0.08 19 2.79 0.81 
Feb 17, 2004 0.63±0.67b 0.07±0.02 0.39±0.10 20 2.33 0.69 
Mar 19, 2004 0.93±1.25b 0.12±0.02 0.58±0.10 20 2.88 0.89 
Apr 24, 2004 4.38±3.25a 0.15±0.03 0.79±0.24 16 7.10 0.65 
May 17, 2004 3.66±2.36a 0.08±0.03 0.48±0.12 20 11.45 0.55 
Jun 14, 2004 3.91±2.48a 0.13±0.02 0.52±0.08 19 14.48 0.58 
Jul 12, 2004 3.30±3.17a 0.10±0.02 0.43±0.08 16 18.78 0.83 
ANOVA P<0.001      

Values for mussel data are means ± s.d.

ANOVA value indicates thread production rate differed significantly among assay dates; superscripts denote groupings defined by multiple comparisons testing (Holm—Sidak method, P<0.05).

Environmental conditions are means of daily values reported during mussel assay; see text for details.

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