I am analyzing rDNA sequences from organisms in different countries. One of the locations seems to be very different from the other ones, and when aligning there are blocks of gaps. When I analyze these sequences without gap trimming in Arlequin or GenAIEx I have a lot of noise. Therefore, I was thinking that perhaps removing these gaps would give me better and more reliable results. Does someone have experience with this? Which is the normal threshold from trimming?