Dave :

I will add the following which may help. The authors did a study in just Fla. lakes (6) and they gathered reported info from other studies for the rest of the article. There is some longitudinal info. In 2 mid Fla. lakes Harris and Monroe 50 miles different in long. In one year they were the same in another year one lake had a 4 mth spawn the other 2 mths. In the compiled article there is also some long. info. They have a Ga. lake and a N.C. lake not to far apart which have the same results. They have 2 that I am not familiar with , one Lake George in Minn. and undefined results from Mich. lakes with similar 21-30 day spawns. My guess is this will be turned into one paper with much more data than these 2 short companion articles.