The impact of salps (Salpa thompsoni) on the Antarctic krill population (Euphausia superba): an individual-based modelling study

Ecological Processes

Table 4 Results of the Scheirer–Ray–Hare test investigating significant impacts of competition with the other species, chlorophyll-a configuration, and their interaction on the investigated model outputs (responses)

Response	Source	Df	Sum Sq	Mean Sq	F value	p value	Sig
Post larvae krill density [n/1000 m³]	Species	1	1,431,644	1,431,644	212.252	0.000	***
	Chlorophyll config	1	220	220	0.033	0.857
	Species:chla_config	1	8657	8657	1.284	0.257
	Residuals	280	468,314	1673	–	–
Post larvae krill mean length [mm]	Species	1	87,958	87,958	13.040	0.000	***
	Chlorophyll config	1	6323	6323	0.937	0.333
	Species:chla_config	1	30,601	30,601	4.537	0.033	*
	Residuals	280	1,783,954	6371	–	–
Krill egg density [n/a]	Species	1	1,431,644	1,431,644	235.942	0.000	***
	Chlorophyll config	1	828	828	0.137	0.137
	Species:chla_config	1	12,778	12,778	2.106	2.106
	Residuals	280	271,931	971	–	–
Salp density [n/1000 m³]	Species	1	46	46	0.007	0.934
	Chlorophyll config	1	107,290	107,290	15.907	0.000	***
	Species:chla_config	1	0	0	0.000	0.996
	Residuals	280	1,801,499	6434	–	–

The tests were applied for the yearly medians in the years 30–100
Competition with the other species is coded as ‘species’ and chlorophyll-a configuration as ‘chla_config’
Significance levels were coded as ‘***’—0.001, ‘**’—0.01, ‘*’—0.05