Body size declines despite positive directional selection on heritable size traits in a barnacle goose population

• Analyses of more than 2000 marked barnacle geese (Branta leucopsis) in the largest Baltic colony, Sweden, showed that structurally large females generally produced larger clutches and larger eggs, hatched their broods earlier in the season, and produced m

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barnacle goose; body size; Branta leucopsis; food quality; reproductive success; selection; survival; LESSER SNOW GEESE; INTRASPECIFIC NEST PARASITISM; BRANTA-LEUCOPSIS; CLUTCH SIZE; REPRODUCTIVE-PERFORMANCE; ENVIRONMENTAL-CONDITIONS; NATURAL-SELECTION; G

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