Life history parameters of narwhals (Monodon monoceros) from Greenland
作者： Eva Garde , Steen H. Hansen , Susanne Ditlevsen , Ketil Biering Tvermosegaard , Johan Hansen
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摘要: Life history parameters for narwhals (Monodon monoceros) were estimated based on age estimates from aspartic acid racemization of eye lens nuclei. Eyes, reproductive organs, and measures body lengths collected 282 in East West Greenland the years 1993, 2004, 2007–2010. Age L-aspartic to D-aspartic nucleus lens. The ratio D- L-enantiomers was measured using high-performance liquid chromatography. equation used, 420.32X — 24.02·year where X is D/L ratio, determined data Garde et al. (2012). Asymptotic length be 405 ± 5.8cm females 462 16.2cm males Greenland, 399 5.9 cm 456 6.9 Greenland. Due several indeterminant class estimates, at sexual maturity subjectively assessed organs 8–9 12–20 ye...
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