NOAA Coral Reef Watch Elevated nutrients The Reefs are Changing.

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Presentation transcript:

NOAA Coral Reef Watch Elevated nutrients The Reefs are Changing

Photos by Gene Shinn (USGS) What does it look like?

Balance in the Reef Corals  Structure Algae  fix inorganic material (C; N) Fish keep algae in check

A “Healthy” Reef St. John USVI - Dennis Hubbard Zooxanthellae Maricopa Community College Zooxanthellae live in coral tissue photosynthesize need light provide “food” for corals Background: see

A “Unhealthy” Reef Grand Bahama Island Dennis Hubbard St. Thomas USVI – Dennis Hubbard To many algae: elevated nutrients too few fish shade out corals block larval settlement

Classifying Impacts Top Down Bottom Up

Fish & Urchins graze on algae Keep reef surface “clean” algae shade corals (light) algae take up space (recruitment) Problems: Overfishing Diseases (urchins) St. John USVI – Dennis Hubbard

Classifying Impacts Top Down Bottom Up

This leads to This

In the Caribbean……

The “Healthy” Reef

From this……

to this!! too few fish too many nutrients both

Conceptual Model Mathematical Model

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CoralReefs in Netlogo Download & Install Program: Download Model: CoralReefs-V5.1.nlogo Your instructor will give you a location Double-click model file to start (see Handout 2)