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Table 1 Effects of the tidal cycle (12 h, 13 samples including 0 h) and season (summer, autumn, winter and spring) on the environmental variability of the water column in the estuary of the river Quempillén (Ancud, Chile)

From: The influence of season and the tidal cycle on division of labour by the radula during feeding in the estuarine brooding gastropod Crepipatella dilatata (Calyptraeidae)

Source

df

MS

F

p

(A) Salinity

 Tidal cycle

12

163.4

46.61

0.0001

 Season

3

1223.3

14.86

0.0001

 Tidal cycle × season

36

56.6

16.15

0.0001

 Error

288

3.5

  

(B) TPM

 Tidal cycle

12

3.66

0.99

0.4584

 Season

3

277.01

1.25

0.3261

 Tidal cycle ×  season

36

5.24

1.41

0.0741

 Error

192

3.69

  

(C) OPM

 Tidal cycle

12

0.52

0.96

0.4865

 Season

3

33.9

2.41

0.1039

 Tidal cycle × season

36

0.53

0.96

0.5321

 Error

192

0.54

  
  1. (A) Salinity, (B) total particulate matter (TPM) and (C) organic particulate matter (OPM). Data were analyzed by two-way repeated measures ANOVA, p values in italic indicate statistical significance