Spatial self-organized patterning in seagrasses along a depth gradient of an intertidal ecosystem.

Area of Science:

• Ecology
• Marine Biology
• Ecosystem Dynamics

Background:

• Seagrass landscape patterns are often attributed to physical factors like hydrodynamics and light.
• The self-organization of seagrass patches into regular patterns requires further investigation into feedback mechanisms.

Purpose of the Study:

• To investigate if seagrass spatial patterns arise from feedback interactions with the abiotic environment.
• To determine if abiotic changes predictably alter these spatial patterns.

Main Methods:

• Field measurements in an intertidal ecosystem.
• Ecological experiments.
• Spatially explicit computer modeling.

Main Results:

• A scale-dependent feedback mechanism, involving local positive and long-range negative feedbacks, was identified as a cause for banded seagrass patterns.
• Seagrass cover and patch size were predictably affected by light limitation and desiccation stress.
• Empirical evidence supports self-organization in seagrass spatial patterns.

Conclusions:

• Seagrass spatial patterns result from self-organization driven by scale-dependent feedbacks.
• These patterns are sensitive to abiotic conditions, suggesting their use as ecosystem stress indicators.