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

Ecological Processes

Table 5 Absolute and relative differences in medians of 100 years for population properties of krill and salps due to the introduction of competition with the other species

Output	Chlorophyll-a scenario	Other species present	No other species present	The absolute difference [n]	The relative difference [%]
Krill density [n/1000 m³]	Constant	0.28	271.65	− 271.4	− 99.9
Krill density [n/1000 m³]	Lognormal	0.34	234.23	− 233.9	− 99.9
Mean length [mm]	Constant	27.40	28.18	− 0.8	− 2.8
Mean length [mm]	Lognormal	27.69	27.95	− 0.3	− 0.9
Krill egg density [n/1000 m³]	Constant	0.00	37,096.01	− 37,096.0	− 100.0
Krill egg density [n/1000 m³]	Lognormal	0.00	22,061.90	− 22,061.9	− 100.0
Salp density [n/1000 m³]	Constant	5351.19	5348.11	3.1	0.1
Salp density [n/1000 m³]	Lognormal	4405.87	4398.72	7.1	0.2

The chosen chlorophyll-a scenario separated the results (constant low concentration of 0.54 mg per m³ or lognormal distribution with mean log = 3.83 mg per m³ and sd log = 0.58 mg per m³)
The density and mean length of krill were calculated for the post-larvae krill stages only