Gaping behaviour of mussels in different treatments and aggregations.

<p>Mean values (+SE) of a) gape angle in the two temperature treatments (HW: heatwave; nHW: control) and in the two types of tidal exposure (emersion in grey; immersion in white); b) gape angle in the four aggregations (Myt-alone: monospecific <i>M</i>. <i>galloprovincialis</i>; Myt-mixed: <i>M</i>. <i>galloprovincialis</i> in mixed aggregation with <i>X</i>. <i>securis</i>, Xen-alone: monospecific <i>X</i>. <i>securis</i>; Xen-mixed: <i>X</i>. <i>securis</i> in mixed aggregation with <i>M</i>. <i>galloprovincialis</i>; pooled emersion and immersion data); c) gaping occurrence in the two temperature treatments, in the two types of tidal exposure and in the four aggregations. The number of replicates varied across temperature treatments and aggregations (HW: Myt-alone = 4, Myt-mixed = 3, Xen-alone = 3, Xen-mixed = 3; nHW: Myt-alone = 4, Myt-mixed = 5; Xen-alone = 3; Xen-mixed = 6).