Barling also argues that a number of individual, organizational, and environmental factors may amplify/reduce (i.e. moderate) the effects of leadership on follower-related outcomes. Building from this reading, elaborate on two mechanisms that may have moderated the effects of Shakelton's leadership on the Endurance crew's motivation, stress, satisfaction, commitment, and/or performance. In your response, make sure to describe why/how this moderator is especially relevant to Shackleton's leadership (that is, provide examples to support your statements).