highly significantP ‐value < 0.001
marginally significantP ‐value = 0.070
Effects of biotic and abiotic conditions on specialization The protozoans showed a marginally significant effect when in their own temperature but with bacteria from different origins (specialization to biotic conditions; parameter = −0.88, P ‐value = 0.070), and a highly significant effect when in different temperatures and with their local bacteria (specialization to abiotic conditions; parameter = −2.05, P ‐value < 0.001, see Table S4), when compared to their densities in local abiotic and biotic conditions.