than 在这里是介词引导比较状语。the one代指前面的difference。recorded by changes in catch sizes做后置定语修饰the one。
than the one recorded by changes in catch sizes
the one 是比较的对象
recorded by changes in catch sizes是后置定语 ，修饰the one
百度教育团队【海纳百川团】为您解答
difference 是主语，betweem present and past 是后置定语 is 后面接表语
be worse than the one 是比较级
recorded by changes in catch sizes是the one 的定语
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