Longitudinal analysis of telomere rate of change in adult barnacle geese. Our assays indicated both increases and decreases in telomere length among adult birds (2 years or older at first sampling). The relationship between these changes (irrespective of direction) and age at second sampling was non-significant (Spearman rank correlation on absolute values, rs = −0.09, p = 0.63, n = 30). A negative value denotes a shortening of telomeres between 2006 and 2008. Data for males (filled circles) and females (open circles) are shown separately.