I'm new to QGIS (Dufour 2.0.1) and have plotted nests as points on a googlemaps base-map and have created buffer zones around the nests. I've also plotted ponds as polygons on the same base-map. I want to know how to calculate the area of the ponds which fall within the buffer zone PER NEST.
Its been a while since you posted your problem, but in case you haven´t solved the problem yet, here´s my go at the issue.
Your problem is much the same as mine. I got two answers, which both, in their own different ways, solved my problem. Your nests=my map sheets and your ponds=my land use parcels. I don´t know if this functionality exists in QGIS, but OpenJump has a tool for this. And just like QGIS, it´s open source software. The only (possible) downside (if your datasets are big) is that OpenJump requires quite a bit of RAM. See the anwers on my question for instructions.