plz someone help me with this question!!!! Thx!!!
The following paragraph is about the bushfire in Australia last year.
[ It may take years for these species to recover. And that may require human assistance, with captive-bred frogs in Australia’s zoos, for example. “Otherwise, we’re hoping animals survived in unburnt pockets,” York explains. He remains somewhat optimistic, saying the Australian bush has a “dramatic capacity to recover.” ]
My question is :
What does "otherwise" mean here? Does it mean human must help these species by breeding animals like frogs. If not, we can only hope animals survive and live in unburnt areas by themselves? or does "otherwise " just mean "in addition”?

Question

plz someone help me with this question!!!! Thx!!!
The following paragraph is about the bushfire in Australia last year.
[ It may take years for these species to recover. And that may require human assistance, with captive-bred frogs in Australia’s zoos, for example. “Otherwise, we’re hoping animals survived in unburnt pockets,” York explains. He remains somewhat optimistic, saying the Australian bush has a “dramatic capacity to recover.” ]
My question is : 
What does "otherwise" mean here? Does it mean human must help these species by breeding  animals like frogs. If not, we can only hope animals survive and live in unburnt areas by themselves? or  does "otherwise " just mean "in addition”?

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To me it's unclear, and you've identified both possibilities perfectly. I prefer the second interpretation ("in addition", a slightly unusual use of "otherwise") as it seems to make more sense; but really, your guess is as good as mine.

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谢谢您的解答！（@song english）

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It may take years for these species to recover. And that may require human assistance, with captive-bred frogs in Australia’s zoos, for example. “Otherwise, we’re hoping animals survived in unburnt pockets,” York explains. He remains somewhat optimistic, saying the Australian bush has a “dramatic capacity to recover.
可能需要数年这些生物物种才能恢复，而且还需要人类的援助，例如，用澳大利亚动物园里圈养的青蛙进行援助。"否则的话，我们只能对那些小片未燃烧的区域的幸存动物抱有希望了"，York 如是说。他依然保持几分乐观地说: " 澳大利亚野生森林"具有神奇的力量进行恢复"。
根据我上述译文，语境分析，显然这儿的otherwise 是副词表示"如果某事没有发生或者现状不同条件下可能发生的"结果"。

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I have a same guess as you, though still confused about it . Anyway, thank you so much!!!

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To me it seems to be more like "if not". Try to take it as you can only expect them survived in unburnt pockets on their own, without human assistance.