Relative abundance of selected putative C23O-TRFs in Lake Svarttjärn and Lake Vallentunasjön in response to temperature in the range from 1.0 to 21.0 °C based on T-RFLP analysis. The average relative abundance of individual TRFs (%) from each sediment core represented by four depths was calculated. Each color represents the correlation with temperature as follows: red box represents positive correlation of C23O-TRFs with temperature (P< 0.05), blue box represents negative correlation of OTUs with temperature (P< 0.05), white box represents the relative abundance of OTUs, which had no significant decrease or increase with temperature. The arrows directed to an example for C23O-TRF increase or decrease with temperature in each lake. Remaining TRFs not included in this graph were not significantly influenced by temperature increase.