Population Trajectories (50 Years)
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Saltmarsh Sparrow: -65% | Piping Plover: -42% | Clapper Rail: -38%
Nesting Flooding & Prey Loss Stress
Nest Inundation Events vs. Fledgling Prey Availability
Ornithological Mechanics: Compound Environmental Stressors
As highlighted by ornithologist Dr. Peter Marra, coastal avian decline is rarely driven by a single factor. Sea level rise (SLR) elevates spring high tides, breaching high-marsh zones and submerging eggs and nestlings of species like the Saltmarsh Sparrow during critical 23-26 day nesting cycles.
Simultaneously, severe drought (SPEI < -1.5) lowers coastal water tables and increases salinity in tidal mudflats, reducing benthic invertebrate (fiddler crabs, amphipods, seeds) biomass. This starves foraging chicks and reduces fledgling body mass. When high SLR and severe drought combine, mortality cascades exponentially across generations.