Well I'm going to close this now. This is quite a serious accusation.
I'm not sure exactly what's gone on, except for the fact someone has told you that your shot has been printed in a magazine, and you're waiting on a reply from the magazines.
The only shot we can see that you've posted (with the description you gave us), is quite a popular photo, one that I'm sure has been duplicated in similar circumstances the world over.
Could it be entirely possible this is what has happened?
I think it's best to hold off on the witch hunt for the moment, until you heard back from the magazine, and have some more proof which we can act on.
Suffice to say, if a member here HAS taken a photo and submitted it as their own, they won't be a member here for long.
However, for that, it is only fair we would need absolute concrete proof, and for the reasons that has been stated, I'm not sure a magazine would accept an 800px shot for print into a magazine.
For one I doubt it would be high enough quality to print at anything bigger than a postage stamp. Secondly they would require a larger size, like matty says, so they can alter their copy pages to suit the design layout they require, rather than having to 'work around' a smaller image.
And finally, surely such a magazine would realise that an 800px photo like that can be lifted from anywhere on the internet and would require at least a larger size as proof of ownership?
Like I say, I'll close this now, and if you get any more information, please don't hesitate to contact us with it.