Figure 7.
Results from standardized major axis regression analysis comparing the Bogong moth, the Turnip moth and the Monarch butterfly compass neuropils. (A) Surface rendering of neuropils in each species (shown in correct relative size), shown with image of each species. (B–D) Regression analysis data; colors matching neuropil color in (A). For each neuropil individual data-points are shown together with each species’ individual regression line, the best-fit common regression line (gray) and the isometric expectation (dotted). The inset depicts the respective neuropil for each graph highlighted in color. (B) Neuropils of the AOTU. (C) Neuropils of the LX. (D) Neuropils of the CX. (E) Analysis of GSI of all neuropils. Solid bars: Bogong moth—Turnip moth comparison (values > 0: Bogong moth bigger; values < 0: Bogong moth smaller); hatched bars: Bogong moth—Monarch butterfly comparison (values > 0: Bogong moth bigger; values < 0: Bogong moth smaller); open bars: Turnip moth—Monarch butterfly comparison (values > 0: Turnip moth bigger; values < 0: Turnip moth smaller). Left: schematic illustration and formula of how the GSI is calculated. Asterisks indicate significance level of GSI. (F) Analysis of SI for all neuropils. Values larger than zero indicate steeper than isometric scaling. Asterisks illustrate significance level of deviations from isometric scaling. Left: schematic illustration and formula of how the SI is calculated. Scale bars: 200 μm. Abbreviations: AOTU, anterior optic tubercle; UU, upper unit; LU, lower unit; NU, nodular unit; CBL, lower division of the central body; CBU, upper division of the central body; BU, bulb; LAL, lateral accessory lobe; GA, gall; PB protocerebral bridge; NO, noduli.