Please select your home edition
Edition
RS Sailing 2021 - LEADERBOARD

You scratched my seagrass!

by Steven Katona on 23 Sep 2014
Sailors for the Sea - educating to protect the ocean SW
Sailors for the Sea publishes monthly articles that translate the language of marine science into fascinating articles about ocean health.

To learn more about the organization visit Sailors for the Sea

Anchors effect on carbon storage

Those who sail come to know the ocean intimately; buoyed by its beauty and the rich life it nourishes, but also saddened by damage from pollution, over-exploitation, climate change or other problems.

Are there things boaters can do to lessen such problems and improve ocean health? What is the current status of the ocean's health, anyhow?

The Ocean Health Index is based on the premise that a healthy ocean provides a range of benefits to people now and in the future. This recognizes that people and the ocean must coexist, because human presence and activities affect nearly all aspects of the ocean and marine life and vice versa. In short, people need nature to thrive; and fostering a resilient, productive ocean will promote healthy sustainable societies.

The Ocean Health Index evaluates the world's oceans according to 10 public goals that represent key benefits of healthy marine ecosystems. Each goal is scored from zero to 100 signifying how well it is doing in achieving those benefits. The scores can be looked at by country and goal, and be averaged to produce a regions overall score.

Boaters have unique opportunities to help with these goals, particularly protecting sea grass and coral reef habitats, both of which provide a remarkable suite of benefits to people and marine life, benefits valued at nearly $12,000 per acre every year.


Grass of the Sea

Sea grasses form shallow meadow-like expanses throughout the world’s warm and temperate waters. Just like grass on land, as the grass grows, it takes up carbon dioxide and releases oxygen to the water and sediments. Additionally, a sea grass meadow’s extensive root system both stabilizes the sediments and stores very large amounts of carbon, keeping it buried for decades or even centuries if not disturbed, reducing the rate of carbon dioxide in the ocean and atmosphere, slowing the rate of global warming and ocean acidification.

Amazingly, seagrasses sequester about as much carbon per square meter as any habitat on earth, including rainforests. Meanwhile, the leaf fronds waving gracefully above form a miniature forest that shelters larvae and young of many commercially important fish and shellfish, as well as beautiful nudibranchs, jellies, worms and crustaceans. Such habitats are also the most important habitats for seahorses. As a further benefit, the flexible fronds are also surprisingly effective at absorbing wave energy and slowing the flow of water, thereby helping to protect coastlines from storm surges.

Seagrasses are globally and regionally threatened by many things. Broad threats include land erosion and consequent sedimentation that clouds the water, reduces photosynthesis and smothers the grasses; and run-off from land of excessive amounts of nitrogen and phosphorus pollution (often from cleaning products and fertilizers) that promote growth of seaweeds or phytoplankton at the expense of seagrasses.

Boaters can play a direct role in reducing a very specific threat, by not anchoring on seagrass beds. Anchors disturb or destroy the root systems, not only does this kill the plants, the sequestered carbon is released into the atmosphere as heat-trapping carbon dioxide. Since most seagrass beds occur in relatively clear and shallow water, boaters should anchor elsewhere and not disrupt the remarkable benefits they offer.

Carbon storage is natural in coastal ecosystems such as seagrasses, tidal marshes and mangroves. The score of 74 is relative to their condition in the early 1980’s. A score of 100 would indicate that these habitats are all still intact today.


Coral Protection

Boaters can also make extraordinary contributions to ocean health through thoughtful anchoring when in the vicinity of coral reefs.

Coral reefs are among our planet’s most valuable and vulnerable ecosystems. Though they cover less than 1% of Earth’s surface, their range of services and benefits is remarkable. Although they don’t sequester carbon, they provide many of the same services and benefits as seagrasses---and more. Where they really shine is in biodiversity and productivity: they support more species per unit area than any other habitat and harbor about 25% of all marine species, serving as nurseries for about one-fourth of all marine fish including food for people in many island nations and elsewhere.

Drawn by the dazzling array of animals, plants, shapes and colors, tourists flock to reefs for diving or snorkeling, boosting jobs and revenues for coastal residents and businesses - an important benefit since coastal (mostly reef-related) tourism generates more than 50% of total GDP in small island states such as Aruba, Antigua and Barbuda, the U.S. Virgin Islands, Anguilla, the Seychelles and Vanuatu as well as Saba (the highest scoring location with a population greater than 1,000 in the 2013 Ocean Health Index; and Bonaire (the highest scoring location with a population greater than 10,000).

All told, the total annual economic value of the ecological services and benefits provided by coral reefs is more than $140,000 per acre, yet pollution, rising sea temperatures and ocean acidification caused by increasing concentrations of atmospheric carbon dioxide, erosion and sedimentation caused by poor land use, and fishing with dynamite and cyanide have made them among Earth’s most threatened habitats. But boaters can help prevent one other kind of damage that often occurs in the most attractive locations: reef damage from anchors, divers and snorkelers.

Anchoring boats on reefs breaks the fragile corals, often killing them. The damage is magnified if the boat swings or there is difficulty in retrieving the anchor. When many boats anchor near the same spot, damage over time can be substantial. Many reef dive sites provide mooring balls so that boats need not deploy their own anchors. When moorings are not available, every effort should be made to anchor where corals are not present.

Coastal protection measures the condition and extent of habitats that protect the coasts against storm waves and flooding. Storm protection by coastal habitats is worth billions of dollars each year – and coral reefs are an essential part of this protection to many nations. This score is judged relative to condition of coastal protection in the 1980’s.

The Ocean Health Index team salutes Sailors for the Sea for its worldwide efforts to protect the oceans, including helping seagrass beds and coral reefs provide their valuable benefits to the ocean and us.

Allen Dynamic 40 FooterC-Tech 2021 SnuffAir 728x90 BOTTOMVaikobi 2024 December

Related Articles

Trofeo Princesa Sofia Mallorca by FERGUS day 2
It does not get better than this, with a sparkling spring sea breeze An afternoon of warm sunshine with 10-12k knots of thermal wind saw all seven course areas operating in champagne conditions, a reminder there is no better place in the world for early season Olympic racing on this scale.
Posted on 1 Apr
Marine Auctions: April Online Auctions
Bavaria 32 sailing yacht, Williams 36 motor cruiser and much more Up for auction: Bavaria 32 sailing yacht, Williams 36 motor cruiser, Mustang 2800 powerboat, Cobalt 243 cuddy cabin, Monterey 270 cruiser, Arber 9 sailing catamaran, and much more.
Posted on 1 Apr
Lords of Tram GKA Big Air Kite World Cup France
Brazil's Mikaili Sol back with a bang to take title in epic Lords of Tram final The 2025 GKA Big Air Kite World Cup kicked off in Barcares, France, on Saturday, with the Tramontana wind roaring at full force.
Posted on 1 Apr
World Sailing Race Officials Training programme
Available to Member National Authorities to apply for on an annual basis World Sailing is proud to announce the launch of a new education programme for Race Officials.
Posted on 1 Apr
2025 Chile World Cup day 5
Emotions ran high as finalists were crowned in Chile The Chile World Cup saw emotional scenes on the beach as exhausted but elated riders returned to shore, having just secured their places in the finals of one of the most iconic events on the World Wave Tour calendar.
Posted on 1 Apr
The Proving Ground
Why the Trofeo Princesa Sofia Mallorca by FERGUS is such an important regatta The end of an Olympic quadrennial cycle often brings sailing campaigns to an end. Some partnerships in doublehanded classes split, with helm and crew going their separate ways, while others use the time to reflect on their future.
Posted on 1 Apr
43rd Copa del Rey MAPFRE surpasses 50 entries
14 nationalities on the entry list Four months ahead of its 43rd edition, which will also host the ORC European Championship, the Copa del Rey MAPFRE already boasts 55 boats from 14 nationalities on its entry list.
Posted on 1 Apr
NZ Govt turns back on last Cup hosting opportunity
Business leaders and commentators are quick to criticise NZ Government's lack of foresight. The NZ Coalition Government decision to walk away from hosting of the 38th America's hadsreceived criticism from City leaders. With changes mooted in the Cup along F1 lines, Cup hosting will move out of the reach of the always cash-strapped Kiwi nation.
Posted on 1 Apr
Erica Lush completes Solo Guy Cotten race
American sailor passes first qualifier for Solitaire du Figaro Rhode Island sailor Erica Lush completed her first qualifying race for the Solitaire du Figaro this week after competing in the Solo Guy Cotten Regatta. Lush completed the regatta's offshore course with a time of one day 22 hours.
Posted on 1 Apr
2025 Etchells Midwinters West in San Diego
Chris Busch wins tight battle after a dynamic three days of racing The 2025 Etchells Midwinters West, hosted by the San Diego Yacht Club and sailed on the Coronado Roads, delivered a dynamic three days of racing, concluding the third leg of the West Coast Spring Series with a hard-fought victory by Chris Busch
Posted on 1 Apr