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Table 1 Size assortment

From: Alternative reproductive tactics and inverse size-assortment in a high-density fish spawning aggregation

Final models

Coefficients

Estimate

SE

Likelihood ratio test

χ2(df)

p

Female.density ~ habitat + size + year + habitat × size

Intercept

(habitat: shelf, size: large, year: 2013)

1.629

0.395

  
 

Habitat: slope

−0.576

0.520

  

Theta = 0.7819 ± 0.189

Size: small

−0.946

0.521

  

df = 41

Year: 2014

0.023

0.365

0.003 (1)

0.949

Res.deviance = 51.04

Habitat: slope* size: small

4.381

0.732

24.413 (1)

<0.0005

Male.density ~ habitat + size + year + habitat × size

Intercept

(habitat: shelf, size: large, year: 2013)

0.972

0.237

  
 

Habitat: slope

2.216

0.269

  

Theta = 5.0346 ± 1.69

Size: small

1.800

0.268

  

df = 41

Year: 2014

−0.115

0.167

0.470 (1)

0.49

Res.deviance = 52.552

Habitat: slope* size: small

−2.897

0.352

41.946 (1)

<0.0005

  1. Negative-binomial GLM testing the relationship between male and female density with habitat (shelf and slope), body-size (large, small), year (2013, 2014) and the interactions between habitat, size and year at the aggregation site (n = 23 points). Maximum model with only the non-significant interaction terms removed to improve parameter interpretation. Statistical hypothesis testing carried out with likelihood ratio tests, except for main effects involved in statistically significant interactions