Planktonic Subsidies to Surf-Zone and Intertidal Communities

Area of Science:

• Marine ecology
• Oceanography
• Coastal processes

Background:

• Plankton are transported onshore, supplying essential food and recruits to coastal ecosystems.
• Surf-zone and intertidal communities rely on these plankton subsidies.
• Plankton delivery is influenced by wind, wave, and tidal forces.

Purpose of the Study:

• To investigate how coastal morphology and hydrodynamics influence plankton transport and concentration in surf zones.
• To understand the ecological consequences of spatial subsidies on community productivity.

Main Methods:

• Analysis of surf-zone hydrodynamics influenced by breaking waves and coastal morphology.
• Comparison of plankton concentrations and larval settlement in areas with different shore slopes and surf-zone widths.
• Identification of bathymetric rip currents as key factors in plankton retention.

Main Results:

• Gently sloping shores with wide surf zones exhibit significantly higher plankton concentrations due to rip currents.
• Steep shores with narrow surf zones show limited plankton accumulation.
• Areas with greater plankton subsidies support more productive surf-zone and potentially rocky intertidal communities.

Conclusions:

• Coastal morphology and surf-zone hydrodynamics are critical determinants of plankton subsidy magnitude.
• Spatial subsidies profoundly impact the productivity of coastal ecosystems.
• Further research incorporating surf-zone hydrodynamics is crucial for advancing ecological theory on spatial subsidies.