这通常会使收集到的个体数量增加，并吸引其他难以捕捉的物种。
This often increases the number of individuals collected and attracts species that are otherwise elusive.
因为每个个体的生命都是短暂的，“机会主义者”这类物种的群体数量很可能受到干旱、严冬或者洪水等不利因素的影响。
Because each individual is short-lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods.
稀缺性不仅仅由某个物种所包含的个体数量决定，还和物种的数量有关。
Rarity is not merely determined by the number of individuals in a species, it is also about how unusual that species is.
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