Comparing Correlations/Regressions?

Hi, I just have a quick question: I am doing a bit of EDA on some biodiversity data in regards to species richness of various taxa in relation to area. Now I want to compare the results of 5 animal taxa to those for 3 plant taxa.

Is this a case in which to use ANCOVA to test for homogeneity of intercepts after testing for homogeneity of the slopes of the regression lines?

Thanks for any input.