δ13C-δ15N map for herbivorous cichlids, periphytons inside their algal farms, and other potential dietary items such as benthic animals, detritus, sediment, and particulate organic matter (POM). Abbreviations of cichlid species are shown in Table 1. Square, circle, and triangle indicate samples of fish muscles, periphyton collected from each cichlid territory, and benthic animals, respectively. Red, blue, purple, and plots indicate each ecomorph, grazer, browser, and scraper respectively. Plots of benthic animals are enclosed in a grey shadow. Error bars indicate standard deviations.