Comparison of effects in transcript regulation in gills of Carcinus maenas upon short-term exposure to hypercapnia and low salinity. (A) Regression analysis of gill 9 vs. gill 7 (both days) in the short-term hypercapnia experiment and (B) of gill 7/day 7 (short-term hypercapnia experiment, this study) vs. gill 8/day 7 (salinity dilution experiment by Towle et al. ). The long-dashed black line represents a theoretical regression ratio of 1:1 (equal influence of both factors), while the black line shows the actual regression. Transcripts outside the short-dashed horizontal and vertical lines are more than 2-fold regulated. Please note the different scaling in (A) and (B). Numbers are according to the gene's rank in table 3, indicating transcripts discussed in further detail in the manuscript. (1) senescence-associated protein [GenBank:DV944570.1], (3) putative Syntaxin binding protein 2 [GenBank:DN161290.1], (4) 23S ribosomal RNA gene (a) [GenBank:DN796131.1], (5) calcium-activated chloride channel [GenBank:DW584691.1], (6) 23S ribosomal RNA gene (b) [GenBank:DN635040.1], (13) multispanning membrane protein (transmembrane 9 superfamily protein member 4 [GenBank:DN202592.1], (25) potential integrin alpha-7 [GenBank:DY307809.1].