Spatial Distribution in Two Species of Galapagos Damselfish

In this study we focus on interactions and spatial distributions of two herbivorous fishes, the yellowtail damselfish (Stegastes arcifrons) and the Galapagos ringtail damselfish (Stegastes beebei) and the herbivorous pencil sea urchin (Eucidaris galapagensis). The purpose of our study was to examine how Stegastes beebei and Stegastes arcifrons are distributed throughout the various near shore habitats as well as how the two species interact with Eucidaris galapagensis. We found a strong preference for rugose and rocky habitat in both species, while Stegastes beebei was distributed across all habitat types. Eucidaris galapagensis density was positively correlated with S. beebei density but negatively correlated with S. arcifrons density.