How does honey bee foraging is advantageous to mustard plant?

The recent paper of King et al. (2013) in Methods in Ecology and Evolution criticizes the use of flower visitation in studying pollination networks. Flower visitors are not always equal to flower pollinators. In the mutualistic network of flowers and pollinators, flowers benefit from pollinators for their reproduction, while pollinators benefit from the flowers by obtaining nectar and pollen. If we have to take into account the pollinator effectiveness (how much the pollinator contributes to pollination in one flower visit), why don't we take into account the 'flower effectiveness' (how much rewards the flower gives to the pollinator)? Can a flower visitor that is not a pollinator have an other function in the interaction network? Is it the interaction that matters in a pollination network or is it the pollen and rewards flux ?

The Lotka Volterra model is the basic model for predator-prey interactions.  Is it also used for herbivore-plant interactions or is there a different, equivalently standard model for herbivore-plant interactions?  And has there been research on using the Lotka Volterra model with an additional carrying capacity for the prey?

When we have 1  seed in a fruit and 1 ovules in a ovary.  

I am doing a study to wild pollinators and seed production at the moment, and I want to know whether different species have a preference towards different parts of the flower head. I have noted for each species how many times it was present on which part of the round flower head (lower part, middle part or upper part). I have performed a Chi-square test (predicted values are 0.3333 * the total number of observed individuals).For most species I have found that the observed values significantly differ from the expected values (I do not know if I say this correct in this way, but there is a significant difference). However, I want to know which groups differ significantly from each other (i.e. bottom vs. middle, bottom vs. top and middle vs. top for each species).

I found somewhere that you can perform a Chi-square test like this:

e.g. bottom vs. non-bottom (i.e. middle and top together) and as expected values: for bottom 0.3333 * total observed individuals of that species and for non-bottom 0.6666 * total observed individuals of that species. And then you have to apply a Benforroni correction (thus 3 comparisons --> alpha = 0.05 / 3 = 0.017).

Is this correct or are there better ways to do this?

Thank you in advance for your answer!

I am looking for the best technique to obtain measurements of pollen grains through photographs

My partner and I are conducting a research on the conservation of the Strongylodon macrobotrys, and our main focus is to provide a soil environment that is the most conducive to the growth of this certain endangered species.