California sea lion population recovery illustrates how conservation success creates new welfare challenges as recovered populations encounter human activities at greater frequency.
California sea lion conservation success demonstrates that population-level success does not automatically translate to improved individual welfare. The recovered population encounters human activities — fishing gear, vessel traffic, domoic acid from agricultural runoff — at much higher frequency than during the depleted period. Individual welfare monitoring has become possible precisely because the population is large enough to study. The welfare cost of entanglement — injury, restriction, starvation — is severe and disproportionately affects younger animals whose foraging inexperience increases entanglement risk.