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Table 4

Spearman rank correlation coefficientsa between maximum carbon fixation rate (Pmax), photosynthetic efficiency (α), and photoacclimation index (Ek) at 5 m depth and stratification strength, surface temperature, euphotic zone depth, N-limitation index, and relative abundance of prasinophyte, cryptophyte, dictyochophyte, and haptophyte chl a. DOI: https://doi.org/10.1525/elementa.307.t4

VariablePmaxαEk

 
Stratification 0.51 (0.05)  0.58 (0.02) –0.44 (0.10)  
Temperature 0.26 (0.33)  0.03 (0.90)  0.08 (0.80)  
Euphotic zone –1.3 (0.63)  –0.42 (0.12)  0.56 (0.03) 
N-limitation index 0.29 (0.46)  0.52 (0.16)  –0.81 (0.01) 
Prasinophyte chl a (fraction) 0.54 (0.03) 0.55 (0.03) –0.19 (0.46)  
Cryptophyte chl a (fraction) 0.56 (0.03) 0.67 (0.005) –0.37 (0.16)  
Dichtyochophyte chl a (fraction) –0.54 (0.03) –0.65 (0.01) 0.32 (0.22)  
Haptophyte chl a (fraction) 0.48 (0.06) 0.62 (0.01) –0.34 (0.19)  
VariablePmaxαEk

 
Stratification 0.51 (0.05)  0.58 (0.02) –0.44 (0.10)  
Temperature 0.26 (0.33)  0.03 (0.90)  0.08 (0.80)  
Euphotic zone –1.3 (0.63)  –0.42 (0.12)  0.56 (0.03) 
N-limitation index 0.29 (0.46)  0.52 (0.16)  –0.81 (0.01) 
Prasinophyte chl a (fraction) 0.54 (0.03) 0.55 (0.03) –0.19 (0.46)  
Cryptophyte chl a (fraction) 0.56 (0.03) 0.67 (0.005) –0.37 (0.16)  
Dichtyochophyte chl a (fraction) –0.54 (0.03) –0.65 (0.01) 0.32 (0.22)  
Haptophyte chl a (fraction) 0.48 (0.06) 0.62 (0.01) –0.34 (0.19)  

a Correlations were with stations M and G combined except for the N-limitation index, which was determined at station M only. Asterisks indicate significant relationships; p values are shown in parentheses.

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