Journal: Royal Society Open Science

Article Title: Unscrambling variation in avian eggshell colour and patterning in a continent-wide study

doi: 10.1098/rsos.181269

Figure Lengend Snippet: Tukey multiple comparisons of means between the total area of maculation values (from SpotEgg) and subspecies of Australian magpies ( C. Tibicen ). Eight subspecies and 245 clutches were analysed from preserved museum samples. All outliers from the specified distribution ranges were removed from the analysis ( table 2 ). Names in bold are those that differed most frequently. p -values show 95% family-wise confidence level. Italicized rows indicate a significant p -value. Direction of change indicates that C. tibicen eylandtensis has a lower total maculation value, thus spottier eggs than three of the seven other subspecies.

Article Snippet: We chose SpotEgg (run in Matlab v. 2012b) to measure maculation, as this program allows one to define the characteristics of the maculation (i.e. spots, blotches, clear) and so increases the precision with which the extent of maculation can be quantified in highly variable eggs (see electronic supplementary material, table S2 for configuration details).

Techniques:

Journal: Royal Society Open Science

Article Title: Unscrambling variation in avian eggshell colour and patterning in a continent-wide study

doi: 10.1098/rsos.181269

Figure Lengend Snippet: Results of hypothesis-based models investigating if the total area of maculation (generated by SpotEgg) of Australian magpie eggs ( C. tibicen ) can be explained by ( a ) the parasite hypothesis; ( b ) the bacterial hypothesis; ( c ) the solar radiation hypothesis and ( d ) the calcium hypothesis. Two hundred and seventy two clutches were analysed from museum samples. The random variable included in all models is the unique grid number (random UGN). The R 2 m reports the R 2 of the model with just fixed effects while the R 2 c reports the R 2 of the full model including random variables. Italicized rows indicate a significant p -value.

Article Snippet: We chose SpotEgg (run in Matlab v. 2012b) to measure maculation, as this program allows one to define the characteristics of the maculation (i.e. spots, blotches, clear) and so increases the precision with which the extent of maculation can be quantified in highly variable eggs (see electronic supplementary material, table S2 for configuration details).

Techniques: Generated

Journal: Royal Society Open Science

Article Title: Unscrambling variation in avian eggshell colour and patterning in a continent-wide study

doi: 10.1098/rsos.181269

Figure Lengend Snippet: Results of multivariate analysis whereby we investigate the explanatory power of environmental variables on maculation scores from SpotEgg. The final model includes T max , LAI, T max * LAI (as an interaction) and unique grid number (random UGN) as a random variable. The R 2 m reports the R 2 of the model with just fixed effects while the R 2 c reports the R 2 of the full model including random variables. Results show that independently, as temperature increases, the total area of maculation decreases (gets less spotty) and as leaf area index increases (more leaf cover) total area of maculation decreases. However, when temperature and LAI increase together, the total area of maculation increases. Italicized rows indicate a significant p -value. R 2 m = 0.05, R 2 c = 0.13.

Article Snippet: We chose SpotEgg (run in Matlab v. 2012b) to measure maculation, as this program allows one to define the characteristics of the maculation (i.e. spots, blotches, clear) and so increases the precision with which the extent of maculation can be quantified in highly variable eggs (see electronic supplementary material, table S2 for configuration details).

Techniques: