Black-Necked Grebe Welfare: Moult Staging at Saline Lakes

Black-necked grebes stage in extraordinary concentrations at saline lakes for moulting, creating exceptional welfare vulnerability from disturbance and water level changes during flightless periods.

Key Facts

Black-necked grebes aggregate in millions at Mono Lake, California and the Great Salt Lake for autumn moulting
Moulting birds are completely flightless for several weeks during feather replacement, creating extreme disturbance vulnerability
The birds double their body weight at staging sites before migration, requiring abundant brine shrimp and alkali flies
Water diversion for agriculture has historically reduced brine shrimp availability at key staging lakes

Welfare Considerations

Staging black-necked grebes are among the most vulnerable birds to site-level welfare threats. Flightless during moult, they cannot escape disturbance and depend entirely on abundant invertebrate prey at a small number of saline lakes. Water level drops that reduce brine shrimp habitat force birds to compete more intensely for remaining resources, causing nutritional stress during a period when maximum food intake is essential. Disturbance from boats or recreation at moulting sites forces swimming escape responses that burn critical energy reserves. Protecting staging lake water levels and minimising disturbance are direct welfare requirements for this species.

What You Can Do

Support water management policies that protect minimum water levels at key grebe staging lakes
Advocate for restricted recreational access to saline staging lakes during the August-November moulting period
Back Mono Lake and Great Salt Lake conservation campaigns that address water diversion from staging habitat
Contribute to grebe monitoring at staging sites to track population use and welfare condition