Table 1 Quantification of scale shape variation via landmark-based geometric morphometrics

From: Genetic analyses in Lake Malawi cichlids identify new roles for Fgf signaling in scale shape variation

Scale

PC1

PC2

PC3

PC1-PC3

P1

38.2%, 0.0623a

23.4%, 0.141c

17.0%, 0.152b

F1,21 = 3.426, p = 0.0381

P2

45.1%, 0.0237a

28.6%, 0.0886b

11.4%, 0.974c

F1,21 = 3.448, p = 0.0374

P3

50.2%, 6.80e-06a

25.3%, 0.871b

14.6%, 0.102c

F1,21 = 19.05, p = 5.95e-06

P4

45.1%, 0.00288a

22.7%, 0.281b

16.3%, 0.169c

F1,21 = 6.20, p = 0.00407

P5

50.6%, 0.00380a

16.8%, 0.742b

15.5%, 0.879c

F1,21 = 3.285, p = 0.0433

P6

50.9%, 0.838a

24.6%, 0.794c

13.3%, 0.125b

F1,21 = 0.816, p = 0.501

P1-6 combo

68.9%a

11.9%b

7.10%c

 

F23

37.4%a

30.4%b

12.1%c

 

F25

46.0%a

21.9%b

13.1%c

 

F21-6 combo

70.9%a

13.1%b

7.10%d

 
  1. Results are reported for both parental (e.g., P1–6) and F2 (e.g., F23 and 5) scales. For parental scale, percent variance explained (PVE) and p-value from t-test are reported for PC1, PC2, and PC3 comparing shapes of L. fuelleborni and T. red cheek. MANOVA (Wilks test) results are also reported for each scale. PVE is reported when all scales were analyzed together, and for F2 scales 3 and 5, which were used for QTL analyses
  2. a Describe variation in scale height at the anterior margin of the radii. Note that in every analysis this is PC1. Negative values correspond to shorter scales, whereas positive values correspond to a taller scale
  3. b Describe variation in scale length, as well as in height at the anterior radii margin. This type of variation is mainly captured on PC2. Negative values correspond to wider and taller scales, whereas positive values correspond to a shorter and narrower scale
  4. c Describe asymmetry in the midline of the scale relative to scale height at the anterior margin of the radii. Negative values correspond to scales where more radii are dorsal to the midline, whereas positive values indicate scales where more radii are ventral to the midline. This type of variation is mainly captured on PC3
  5. d Describes variation in curvature on anterior edge of radii. Negative values describe curvature that is convex, whereas positive values indicate a relatively flat anterior edge
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