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Florida Keys National Marine Sanctuary Florida Keys National Marine Sanctuary Photo: Greg McFall/NOAA Grade Level 6-8 Timeframe Photo: Mitchell Tartt/NOAA Two 45 Minute Sessions Activity Summary Materials Students will research the ecology of coral reefs, natural and Teacher Use: Computer, anthropogenic threats to corals, and the science of coral restoration. projector, and screen In pairs, students will design and make an argument for a proposed new Student computer access (1:1 or coral nursery to be placed within Florida Keys National Marine 1:2) Sanctuary (FKNMS). Student science journals or Learning Objectives notebooks Students will be able to: Whiteboard and markers (1 per • Explain and discuss the importance of coral reefs in terms of student) ocean biodiversity Digital Materials (links provided): • Explain general characteristics of corals • Mission: Iconic Reefs video • Describe natural and anthropogenic threats to coral reefs • 360 Coral Restoration • Explain the importance of coral restoration projects and the video general process of coral restoration • FKNMS Map • Synthesize their knowledge in order to design a plan for a new • Staghorn coral coral nursery and make reasoned arguments for its establishment • Elkhorn coral • Restoring Coral Reefs Background Information video Florida Keys National Marine Sanctuary • Cheeca Rocks Sanctuary Designated on November 16, 1990, Florida Keys National Marine • Restoration Guidelines Sanctuary protects 2,900 square nautical miles of waters surrounding Print Materials: the Florida Keys, from south of Miami westward to encompass the Dry Tortugas, excluding Dry Tortugas National Park. • Exploring Coral Restoration • Coral Reef Ecology The shoreward boundary of the sanctuary is the mean high-water mark, Webquest essentially meaning that once you set foot in the waters of the Florida • Designing a Coral Nursery Keys, you have entered the sanctuary. Within the boundaries of the • Activity Rubric sanctuary lie spectacular, unique, and nationally significant marine • 8.5 x 11 in. ¼ in. grid paper resources including the only coral barrier reef in the continental United sanctuaries.noaa.gov/education Key Words abiotic, acroporid corals, anthropogenic, biotic, biodiversity, coral bleaching, coral nursery, coral trees, ecosystem, ocean acidification, outplanting, reef building corals, substrate animals are adapted for maneuverability rather than speed to hide within coral branches. Corals are environmental health indicators; they are incredibly sensitive to temperature, acidity, Photo: NOAA sedimentation, pollution, and eutrophication. States, extensive seagrass beds, mangrove-fringed Eutrophication is an excess of nutrients (usually islands, and more than 6,000 species of marine nitrogen and phosphorous) that can cause algal life. The sanctuary also protects pieces of our blooms. An excess of algae is harmful to coral reefs nation’s history such as shipwrecks and other because the algae will out-compete them for space archeological treasures. and sunlight, causing mass die-offs. Increased water temperatures can break down the Coral Reef Ecology relationship between coral and their symbiotic In warm, shallow waters, corals colonize rocky zooxanthellae, resulting in bleaching. Bleached areas forming one of the most productive and corals are also very susceptible to algae overgrowth diverse ecosystems in the world. Thousands of because they are in a weakened state. Acidity is different organisms can be found on a single reef. increasing in the ocean (which means the pH is Coral continue to build additional hard surface dropping), and this spells trouble for organisms with their calcium carbonate skeletons. Twenty which utilize calcium carbonate skeletons (corals, five percent of marine life lives together on coral bivalves, crabs, etc.). Calcium carbonate becomes reefs, yet coral reefs take up less than 2% of the weakened in more acidic water, which leads to seafloor. With so many different species and dissolving of the very backbone of the reef. Human individuals, there are many opportunities for impacts, including pollution, oil spills, microplastic organisms to work together and to compete with and microplastic (plastic pieces less than 5mm), one another. Coral reefs are rich with symbiotic and overfishing, can also devastate coral reefs. relationships. Without them, the corals themselves Some ways to keep reefs healthy include would not exist as they do today. Living within the sustainable fishing, marine protected areas, a coral’s tissue are tiny cells of photosynthetic algae reduction in single-use materials, and curbing our called zooxanthellae. Corals and zooxanthellae emissions of greenhouse gases. have a mutualistic relationship where the coral provides the zooxanthellae with protection, carbon Coral Restoration dioxide (CO2), and nutrients, and the To help replenish wild populations of corals that zooxanthellae provide the coral with energy in the have been degraded due to natural or form of food generated via photosynthesis. anthropogenic impacts, researchers grow corals in underwater nurseries. Nursery sites are ideally Coral reefs are ecologically important for many easy to access, protected areas with natural light reasons. They support incredible species diversity availability, stable water temperature and flow, in an area which is naturally nutrient-poor. salinity, sedimentation, and turbidity that are free There is high competition for space in coral reefs from land-based pollutants. In the nursery, coral because sunlight is a prerequisite for growth and fragments – either collected from viable stocks or success. Many corals tend to grow upward then salvaged from pieces of broken coral – may be outward to maximize sunlight exposure. Corals act attached to pedestals on blocks on the seafloor, as a nursery for many juvenile animals. Their hung on line nurseries that look like clothes lines, physical structure allows places to hide; many or placed in baskets suspended off the seafloor. sanctuaries.noaa.gov/education Coral trees - A tree-link structure tethered to the ocean floor Vocabulary and buoyed with a subsurface float; coral fragments are Abiotic factors - The nonliving factors in an ecosystem. hung from the branches of the tree using monofilament line. Acroporid corals - The genus that includes staghorn and Ecosystem - A system of interactions between a community elkhorn corals; important branching corals often grown in of organisms and their environment. nurseries. Ocean acidification - The lowering of seawater pH due to Anthropogenic - Human caused. increased dissolving of carbon dioxide into seawater. Biodiversity - The variety of life on Earth, encompassing Outplanting - The process of planting coral fragments grown variation at all levels, from genes to species to in nurseries back onto reefs. ecosystems. Reef building or “hard” corals - Corals that secrete a calcium Biotic factors - The living factors in an ecosystem. carbonate exoskeleton. Coral bleaching - A stress response during which corals Substrate - The surface or material on, or from which, an expel the zooxanthellae living inside their tissues. organism lives, grows, or obtains its nourishment. Coral nursery - A site where corals are grown for the purpose of outplanting. Floating freely in the water, the corals receive 2. As an example of what is being done to better water circulation, avoid being attacked by restoral coral reefs, project Explore the Blue: predators such as fireworms or snails, and 360 Coral Restoration video on screen. generally survive at a higher rate. The rescued Demonstrate how to “look around”: up, corals are generally cared for by biologists and down, left, right. Explain that Florida Keys volunteers who monitor their health and growth National Marine Sanctuary (FKNMS) was and keep algae, encrusting sponges, and tunicates established in 1990 in response to concerns at bay. The goal is to transplant nursery-reared about declines in the health of local coral reef corals back out on the reef to bolster existing coral ecosystems. Display a map of the sanctuary. colonies, to reseed reefs after major events, and to Explain that Acroporid coral, specifically increase the likelihood of successful cross- staghorn and elkhorn coral, have been fertilization during sexual reproduction. particularly vulnerable (share pictures of both). Ninety-seven percent of these corals Preparation have been lost in the last 50 years. Both 1. Download or open links to all digital species, along with others, were listed under materials. the Endangered Species Act in 2012. These 2. Prepare teacher and student devices (e.g., species are reef-building branching corals laptop, computer/projector, handhelds, VR which provide much structural diversity to sets, etc.). the reef and thus increase its biodiversity. 3. Preview digital and print materials. 3. Have students preview the questions on the 4. Copy Exploring Coral Restoration document Exploring Coral Restoration document prior (one per student), Coral Reef Ecology to watching the video. Give students time to Webquest (one per student), and Designing a watch and explore Explore the Blue: 360 Coral Nursery document (one per pair). Coral Restoration video. Encourage them to pause the video and “look around.” Students Procedure can record their observations and responses Part 1 - Introduction to Coral Restoration while exploring the video or after they have Time: 25 minutes explored. 1. Set the stage by reviewing the natural and 4. Once students have completed their anthropogenic impacts on
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