Table 1 Relative (0–1) inhibition of growth rate during the competition experiment.

From: Intraspecific variation in metal tolerance modulate competition between two marine diatoms

 

Skeletonema marinoi

Thalassiosira baltica

Inhibition

Control

Ag*

Cd*

Cu

Control

Ag*

Cd*

Cu

Day 0–4

0 (0.004)

1.29 (0.057)

0.29 (0.043)

0.6 (0.019)

0 (0.012)

0.1 (0.15)

0.78 (0.23)

0.1 (0.068)

Day 4–7

0 (0.018)

1.1 (0.048)

0.62 (0.066)*

0.61 (0.048)

0 (0.053)

0.16 (0.054)

0.98 (0.44)

0.24 (0.03)

Day 7–10

0 (0.048)

1.1 (0.29)

0.6 (0.039)*

1.3 (0.11)*

0 (0.11)

0.025 (0.025)

0.89 (0.48)

1.2 (0.39)*

Average

0

1.2

0.5

0.84

0

0.095

0.88

0.51

  1. Estimates of inhibition are based on microscopy observations on day 0, 4, 7, and 10, and the means (S.D.) are shown (N = 3). Linear mixed effects models identified all three factors (Metal, Time, and Species) as significant (all p < 0.0001) and also interactions between Species × Metal (F(3,40), p < 0.0001) and Metal × Time (F(6,40), p < 0.0001), but not the Species × Time (F(2,40), p = 0.73). Asterisk and bold-formatted metals (Ag, Cd, and Cu) therefore indicate post hoc significant (p > 0.05) differences between the two species without considering Time effects. Asterisk and bold-formatted inhibition numbers indicate significant Time effect for Metals (compared with days 0–4).