That's an extremely good question to which I have a very poor answer.
The reality is that we don't know very much about how they interact together. In most of what I shall call the production models, in which we estimate the consumption rates of the species in the area, we still have not built in a temperature-dependent relationship. It will affect things somewhat, but I don't expect it to cause substantial changes overall. We can expect possibly a 30% increase in the predation rates by various groups.
I wouldn't expect things like seals, though, to increase their predation rate with warming temperatures because they're basically warm-bodied critters and they're going to eat the amount that they need to eat, in the same way.
With respect to the other variables, salinity is more an indicator of water mass characteristics so it's unlikely to influence things a great deal.
Despite the fact that people are greatly concerned about the effect of ocean acidification, the amount of research that has been done to understand the impact of those changes on marine life is in a state of evolution, which is the best way I can describe it. The outcomes are not clear and they're not consistent, largely because the research has not been done in a consistent way. It's an area where it's trying to progress by leaps and bounds but it's still at the bottom of the curve.