When I want to focus in one keyword, gaining more links to my site, rank that keyword, I make an adjustment as changing signature in some forums that i usually put my posts. Change URL in links, keywords in anchor texts. What will happen with the amount of backlinks point to my site. I checked in DGP and saw when i change my signature, all of the links will change to new anchor text and URL, include of old links that I built before. So question is How it affect to SEO, Wil I lose some old backlinks ?