Table 4.
Statistical summary of non-parametric tests assessing how these species of edible insect differ in their fatty acid profiles.
| PC1 | PC2 | ∑SFA | ∑MUFA | ∑PUFA | ∑PUFAn-6 | ∑PUFAn-3 | ||
|---|---|---|---|---|---|---|---|---|
| P(Variance) | 49.76 | 22.88 | – | – | – | – | – | |
| Species | 14.62 (**) | 28.45 (***) | 21.12 (***) | 20.29 (***) | 10.04 (*) | 5.68 (n.s.) | 9.15 (n.s.) | |
| BSF - | HSF | ** | *** | *** | ** | n.s. | n.s. | n.s. |
| PL | ** | *** | ** | *** | n.s. | n.s. | n.s. | |
| STC | ** | * | n.s. | n.s. | ** | n.s. | ** | |
| TM | n.s. | *** | * | * | n.s. | n.s. | n.s. | |
| HSF- | PL | n.s. | n.s. | n.s. | n.s. | n.s. | * | n.s. |
| STC | n.s. | n.s. | * | *** | n.s. | n.s. | ** | |
| TM | n.s. | n.s. | * | n.s. | n.s. | n.s. | n.s. | |
| PL - | STC | n.s. | n.s. | n.s. | *** | ** | n.s. | ** |
| TM | n.s. | n.s. | n.s. | n.s. | n.s. | n.s. | n.s. | |
| STC - | TM | * | n.s. | n.s. | * | * | n.s. | ** |
| ∑SFA | −0.27 (n.s.) | 0.59 (***) | – | – | – | – | – | – |
| ∑MUFA | 0.09 (n.s.) | −0.53 (***) | – | – | – | – | – | – |
| ∑PUFA | 0.16 (n.s.) | −0.16 (n.s.) | – | – | – | – | – | – |
| ∑PUFAn-6 | −0.07 (n.s.) | −0.07 (n.s.) | – | – | – | – | – | – |
| ∑PUFAn-3 | 0.33 (*) | −0.16 (n.s.) | – | – | – | – | – | – |
From top to bottom: the proportion of variance in the fatty acid dataset captured by each of the two major principle components in the PCA; Kruskal-Wallis output, in the form χ2 (significance level), assessing how species differ in their distribution of PC1 and PC2, as well as in their content of each fatty acid saturation class; significance levels of the post-hoc output of the Kruskal-Wallis test, showing which species pairs vary in their principle component distributions and in the degree of saturation of their fatty acid profiles; output of a series of correlation tests, using the Pearson method, assessing the relationship between each fatty acid saturation class and each of the two major principle components in order to provide biological context to the PCA output.
Significance level: p > 0.05 (n.s.) *p < 0.05 **p < 0.01 p < 0.001***.
BSF, Black soldier fly (Hermetia illucens); HSF, House fly (Musca domestica); PL, Palm weevil (Rhynchophorus phoenicis); STC, Shea tree caterpillar (Cirina butyrospermi); TM, African termite (Macrotermes bellicosus).
SFA, saturated fatty acids; MUFA, mono-unsaturated fatty acids; PUFA, poly-unsaturated fatty acids.