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Coastal & Marine Geology Program > Center for Coastal & Watershed Studies > Professional Paper 1751

Systematic Mapping of Bedrock and Habitats along the Florida Reef Tract—Central Key Largo to Halfmoon Shoal (Gulf of Mexico)

USGS Professional Paper 1751

by Barbara H. Lidz, Christopher D. Reich, and Eugene A. Shinn

Introduction:
Table of Contents
Project Overview
Project Objective
Geologic Setting
Primary Datasets
Primary Products - Overview Maps & Evolution Overview:
Bedrock Surface map.
Introduction
Depth to Pleistocene Bedrock Surface
Reef & Sediment Thickness
Benthic Ecosystems & Environments
Sedimentary Grains in 1989
Summary Illustration Index Map
Evolution Overview
Tile-by-Tile Analysis
Satellite image of the Florida Keys showing location of tiles.
Organization of Report
Tiles: 1, 2, 3, 4,
5, 6, 7/8, 9/10,
11
Summary
Acknowledg-
ments
References
Disclaimer
Related
Publications

Tile 7/8

Natural Stressors: The concept behind establishing National Marine Sanctuaries is to manage, protect, and preserve the natural resources of that part of the ecosystem that falls within Sanctuary boundaries (e.g., Wilkinson, 1993). Naval personnel have long described a tool or method that did not work as being as "useless as a screen door in a submarine" (Jameson et al., 2002, p. 1177). In the context of marine sanctuaries, the screen-door hypothesis centers on external stressors from atmospheric, terrestrial, and oceanic sources, all of which can degrade the environment and compromise protection. Particularly sensitive are those organisms such as coral reefs that cannot relocate to a more favorable setting. For long-term stewardship efforts, then, it is important to understand how stressor sources enable entry of pollutants to the ecosystem. Coral reefs require clear, warm, low-nutrient, open-ocean waters to survive, yet they are bounded by the three screen doors: atmospheric, terrestrial, and oceanic stressor sources.

Sanctuary decision makers might have some success on managing the terrestrial side (Causey, 2002), but atmospheric and oceanic sides usually involve large-scale national and international problems (Jameson et al., 2002). Certainly, managing local human activities is beneficial to the reefs (Table 1).

Coastal & Marine Geology Program > Center for Coastal & Watershed Studies > Professional Paper 1751

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