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Table 2 Regression analysis results

From: Evolution of embryonic developmental period in the marine bird families Alcidae and Spheniscidae: roles for nutrition and predation?

Variable

Standardized coefficient

Standard error

Clutch size

-8.337654**

2.552405

Offshore foraging

1.990214

1.575975

Diurnality

-3.497337*

1.695883

Open nests

-4.164798*

2.258906

  1. Summary of the (phylogenetically corrected, reasonably assuming Brownian motion given λ = 0.999995) analysis of the regression of auk and penguin embryonic developmental period (EDP) residuals (computed from the EDP predicted from egg mass) on clutch size, foraging habitat (0 = inshore, 1 = offshore), activity pattern (0 = nocturnal or crepuscular, 1 = diurnal) and nesting habits (0 = enclosed, 1 = open). The independent variables explain a large amount of the variation in EDP (r2 = 0.444949). Alpha = 28.483666 (s.e. = 5.898111), likelihood = -79.736323.