Table 1 Summary of the models that best explain variation in the physiological parameters for both crab species.

From: Sensitivity to near-future CO2 conditions in marine crabs depends on their compensatory capacities for salinity change

Species

Physiological parameter

Terms included in best model

Variance structure

Fixed Effects

Carcinus maenas

Haemolymph pH

Sal:pCO2

Time

Haemolymph pCO2

None

Time

Haemolymph [HCO3−]

None

Time

Osmolality

None

Sal + Time

Gill NKA activity

None

Sal

Cancer pagurus

Haemolymph pH

Time

Sal + Time

Haemolymph pCO2

Sal:Time

pCO2 + Time + CW

Haemolymph [HCO3−]

pCO2

pCO2 + Time + CW

Osmolality

Sal:Time

Additive + pCO2:CW + Time:CW

Gill NKA activity

None

CW

  1. NKA = Na+/K+ ATPase activities in posterior gill 8.
  2. Models represent simplifications of a global model including four fully crossed variables (seawater pCO2; salinity (Sal); and time as fixed factors; body size (CW) as a covariate). An error variance structure is included crossing pCO2, salinity and time.
  3. Models were selected using AICc and log-likelihood ratio tests as detailed in Methods, and in Supplementary Tables S3 –S6.
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