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The great cats represent the ultimate test of our willingness to share this planet with other species. We must act now to offer them a bright and secure future, if for no other reason than they are among the most wonderful expressions of life on Earth.

http://ngm.nationalgeographic.com/2011/12/tigers/schaller-text

Does the if above mean the same as 'though' ?

Thank you very much in advance.
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No.

This construction "if for no other reason" means: There may be only one reason, reason A. There may be many, many other reaons. But we should do something for reason A, even if those other reasons don't exist.

We must act now. One certain reason to do this is their role as the most wondeful expressino of life on earth. There may be other good reasons too.
Comments  
No.

In this sentence, 'if' does not mean the same as 'though'. If though was used, it would not make sense. The sentence means that we must save the big cats, even if there is no reason to do so other than them being the most wonderful expressions of life.
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Thank you very much for your help.

But I doubt if in the text above leads to the interpretation :We must save the big cats, even if there is no reason to do so other than them being the most wonderful expressions of life.

Our greatest challenge is to instill national commitments to save the great cats. It's everyone's task. Communities need incentives to share their land with such predators. Benefits need to be based on moral values as well as on economic ones. The jaguar is a representative of the sun, the protector of all that lives among indigenous societies of Latin America; the tiger in China was an emissary of heaven and in Hindu India a force for good; and Buddhism stresses respect, love, and compassion for all living beings. Conservation is based on moral values, not scientific ones, on beauty, ethics, and religion, without which it cannot sustain itself.

The great cats represent the ultimate test of our willingness to share this planet with other species. We must act now to offer them a bright and secure future, if for no other reason than they are among the most wonderful expressions of life on Earth. http://ngm.nationalgeographic.com/2011/12/tigers/schaller-text

My interpretation is: Even though we must save the big cats now, we must do it only for the reason they are among the most wonderful expression of life. (not for politics or science, otherwise.)

I'm not sure though. I'd be pleased if someone give me opinions suitable for this context.
 BarbaraPA's reply was promoted to an answer.
Thank you Grammar Geek. To study English sufficiently, the mere definitions of dictionary aren't enough. It's like a treasure to be given detailed explanations from native speakers like you.

Regards
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