Pinnipeds require secluded and undisturbed areas for land-based resting and reproductive activities.
If human disturbance is too great, pinnipeds will abandon haul-out sites and rookeries, thereby, possibly decreasing reproductive success. Births of harbor seals in Elkhorn Slough, occurred only after the California Department of Fish and Game protected the haul-out site from human encroachment. Fishery interactions have significantly impacted some local marine mammal populations. Wendell et al. 1985, Jefferson et al.