Ecological Archives E088-042-A1

Gjert E. Dingsør, Lorenzo Ciannelli, Kung-Sik Chan, Geir Ottersen, and Nils Chr. Stenseth. 2007. Density dependence and density independence during the early life stages of four marine fish stocks. Ecology 88:625–634.

Appendix A. Table of covariates used in the modeling.

TABLE A1. List of variables used in the analysis of early life-stage abundances. Variables that were significantly affected by those listed in the first column are in bold in the third column (modeled variables) and those that were not affected are in regular characters.

Variable	Definition	Modeled variables	Survey gear
	Natural logarithm of maturing capelin stock biomass.	Cap⁰	Acoustic survey
	Natural logarithm of catch numbers of mature capelin.	Cap⁰	Fisheries statistics
	Natural logarithm of capelin age-0 abundance.	Cap¹	Pelagic trawl survey
	Mean length of capelin at age-0.	Cap¹	Pelagic trawl survey
	Natural logarithm of capelin age-1 abundance.		Acoustic survey
	Natural logarithm of cod spawning stock biomass.	Cod⁰	VPA estimate
	Mean age in cod spawning stock.	Cod⁰	VPA estimate
	Natural logarithm of cod age-0 abundance.	Cap⁰, Had⁰, Her⁰, Cod¹, Cap¹, Had¹, Her¹	Pelagic trawl survey
	Mean length of cod at age-0.	Cod¹	Pelagic trawl survey
	Natural logarithm of cod age-1 abundance.		Bottom trawl survey
	Catchability factor	Cod¹, Had¹	Bottom trawl survey
	Natural logarithm of haddock spawning stock biomass.	Had⁰	VPA estimate
	Mean age in haddock spawning stock.	Had⁰	VPA estimate
	Natural logarithm of haddock age-0 abundance.	Had¹	Pelagic trawl survey
	Mean length of haddock at age-0.	Had¹	Pelagic trawl survey
	Natural logarithm of haddock age-1 abundance.		Bottom trawl survey
	Natural logarithm of herring spawning stock biomass.	Her⁰	SeaStar estimate
	Mean age in herring spawning stock.	Her⁰	SeaStar estimate
	Natural logarithm of herring age-0 abundance.	Her¹	Pelagic trawl survey
	Mean length of herring at age-0.	Her¹	Pelagic trawl survey
	Natural logarithm of herring age-1 abundance.		Acoustic survey
	Center of gravity in N-S direction of investigated species at age-0.	Cap¹, Cod¹, Had¹, Her¹	Pelagic trawl survey
	Center of gravity in E-W direction of investigated species at age-0.	Cap¹, Cod¹, Had¹, Her¹	Pelagic trawl survey
	Natural logarithm of number of cod at age 3–6.	Cap⁰, Cod⁰, Had⁰, Her⁰, Cap¹, Cod¹, Had¹, Her¹	VPA estimate
	Natural logarithm of number of herring at age 1–5.	Cap⁰, Cap¹	Acoustic survey
	Mean winter (Dec.-March) temperature (^oC) 0–200m at the Kola section.	Cap⁰, Cod⁰, Had⁰, Her⁰, Cap¹, Cod¹, Had¹, Her¹	CTD-data
	Mean summer (June-Aug.) temperature (^oC) 0–200m at the Kola section.	Cap⁰, Cod⁰, Had⁰, Her⁰	CTD-data

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