change変わり
First and foremost, the whole reasoning of the report is based upon an assumption that the arctic deer's population will not change much over time. Let us think about a situation where the population of the arctic deer is decreasing each year by 0.8 fold. Despite the fact that deer's being unable to follow their age-old migration patterns across the frozen sea and decrease, the decrease in population will obviously lead to an total decrease of the arctic deer's population in the end. Situations like this would weaken the validity of the reporter's claim, and in order to verify the claim, detailed investigation on this point must be addressed.
