Geographic clines in body weight of Norwegian red deer: a novel explanation of Bergmann's rule?

摘要: Variation in body weight of red deer Norway was investigated along two climatic gradients: one with increasing latitude, and the other proximity to coast. Deer all sex/age classes were significantly heavier northern parts their range compared south also at inland localities Body weights negatively correlated temperature precipitation throughout years. These clines apparently support Bergmann's rule, may reflect selection for large size cold environments. However, we interpret results light recent work on plant physiology which indicates higher quality forage high latitudes, cooler drier climates: conditions are likely lo enhance growth north inland. Evidence that individual migrate inland, following snow melt, is presented discussed terms an adaptive behaviour maximises intake digestible energy nutrients.