Hi, really interesting paper with a number of useful extensions I could envision. Looking at Fig. 1, it almost seems that a type I functional response model could be fit to the +sponge treatment data. I understand the motivation to fit the Rogers curves to each treatment for comparisons of a & h parameters, but it would also be interesting to know if the functional response was itself "shifted" to a linear relationship (at least over the range of oyster densities offered) when sponge is infesting the oysters. Thanks. Robert Dunn