How might abundant amounts of food allow herons to reproduce more often?

An abundant amount of food means that the competition over food will be less and chance to get food will be higher. This will increase the survivability of the herons so there will be more herons survive until reproduction age. That means the number of herons reproducing will be increased. Reproduction also needs resource and less happens when competition is fierce. Abundant food makes the herons able to recover more quickly.