Codes for:

• 1 Evaluate temporal trends of Pygoscelis penguin breeding success in the South Shetland Islands and Antarctic Peninsula;

• 2 Evaluate temporal variability of krill biomass in relation to fishing harvest;

• 3 compare penguin breeding success in periods of low or high krill biomass and low or high fishing catches.

Four data sources were used: MAPPPD data [@Humphries2017]. File named MAPPPD.Rds; CCAMLR acoustic estimates of krill biomass CCAMLR_krill_biomass.Rds, summarized fishing catch CCAMLR_krill_fishing_catch.Rds and management strata shapefiles AMLR_Strata.Rds. Refer to the manuscript for methodological details.