We use a highly complete subset of the GAMA-II redshift sample to fully describe the stellar mass dependence of close-pairs and mergers between 10 ^ { 8 } { M _ { \odot } } and 10 ^ { 12 } { M _ { \odot } } .
Using the analytic form of this fit we investigate the total stellar mass accreting onto more massive galaxies across all mass ratios .
Depending on how conservatively we select our robust merging systems , the fraction of mass merging onto more massive companions is 2.0 % – 5.6 % .

Using the GAMA-II data we see no significant evidence for a change in the close-pair fraction between redshift z = 0.05 – 0.2 .
However , we find a systematically higher fraction of galaxies in similar mass close-pairs compared to published results over a similar redshift baseline .
Using a compendium of data and the function \gamma _ { M } = A ( 1 + z ) ^ { m } to predict the major close-pair fraction , we find fitting parameters of A = 0.021 \pm 0.001 and m = 1.53 \pm 0.08 , which represents a higher low-redshift normalisation and shallower power-law slope than recent literature values .

We find that the relative importance of in-situ star-formation versus galaxy merging is inversely correlated , with star-formation dominating the addition of stellar material below \mathcal { M } ^ { * } and merger accretion events dominating beyond \mathcal { M } ^ { * } .

We find mergers have a measurable impact on the whole extent of the GSMF , manifest as a deepening of the ‘ dip ’ in the GSMF over the next \sim Gyr and an increase in \mathcal { M } ^ { * } by as much as 0.01–0.05 dex .