“…?13.4 ± 4.2 % (n = 6), guano (Mizutani and Wada 1988) ?21.9 to ?24.5 % (n = 2), guano (0-20 cm depth) (Zhu et al 2009) ?31.8 ± 4.2 % (n = 8), rookery soil (0-5 cm depth) (Mizutani and Wada 1988) ?32.2 ± 3.5 % (n = 6), rookery soil (0-5 cm depth) (Mizutani et al 1986) ?28.6 %, organic N from rookery soils (Wada et al 1981) ?8.0 ± 1.2 % (n = 6), fresh excreta (Lorenzini et al 2010) ?8.0 ± 0.4 % (n = 4), fresh excreta (Mizutani and Wada 1988) Ammonia gas ?6.9 % ?4.7 % (n = 2), bat cave, Mexico (McFarlane et al 1995) ?2.4 ± 0.8 % (n = 6), cape fur seal colony, Namibia (Crittenden et al unpublished data) -10.0 ± 3.1 % (n = 20) royal penguin rookery, Macquarie Island (Erskine et al 1998) U. sphacelata -15.5 to -2.0 % -17.8 to ?10.4 % U. decussata and Usnea antarctica (Cocks et al 1998) U. decussata -17.5 to -10.0 % -18.2 to ?7.5 % U. decussata and Usnea antarctica (Huiskes et al 2006) -15.3 to -7.8 % Usnea antarctica (Lee et al 2009) X. borealis -0.9 to ? 9.0 % ?20.6 ± 0.7 (n = 6), Caloplaca eudoxa, Cape fur seal colony, Namibia (Crittenden et al unpublished data) Biogeochemistry (2015) A key assumption in the calculation of F NH 3 is that d…”