david u studies on different forage species and combos (not exactly as you stated but close) were done by Swingle from 1930s to 50s http://www.sdafs.org/fmsafs/hoe/swingle.html. The ones the rest of us posted about are building on those older studies. The last one I posted is a survey of 60 such studies.

The difficult part is ponds and the food web are so dynamic that the results vary a lot from year to year and pond to pond. The results in the test ponds could be very different from one attempt to the next. Ponds a few hundred yards apart can react differently not to mention hundreds of miles apart. The food web is a very complex subject . For sure it is not just a simple food chain pyramid as shown most places.