Aldosterone will cause of sodium, while anh will cause of sodium.

Answer;
Aldosterone will cause reabsorption of sodium, while ANH will cause excretion of sodium. 

Explanation;
Aldosterone is a steroid hormone secreted by the adrenal glands, it serves as the principal regulator of the salt and water balance of the body. It functions to increase sodium reabsorption. 
ANH, also the atrial natriuretic hormone is a hormone that is secreted by the atria of the heart, it lowers blood pressure by increasing the excretion of sodium and water by the kidneys.

Because the carnivores keep the herbivore population in check