Conclusion
Carvalho said the world must prioritize timely, ambitious and coordinated actions that conserve, restore and sustainably manage seagrasses.
As that happens, countries need to ensure that local communities, who have been living in harmony with nature for thousands of years, benefit.
Ramping up these efforts is integral to reaching the Paris Agreement and many of the United Nations’ Sustainable Development Goals, said Carvalho.
Seagrass is also considered crucial for helping countries meet the goals of the Rio Conventions, which are the three primary global agreements tackling climate change, biodiversity loss and land degradation.
In order to achieve the targets of each and secure an environmentally sustainable future, UNEP’s latest State of Finance for Nature report estimates a need for US$29 billion dollars in annual investment in seagrass beds.
Here are five surprising ways seagrasses can safeguard wildlife, benefit people and help lay the groundwork for a more sustainable future.
Seagrass is a haven for marine species
Seagrass meadows are nurseries for 20 percent of the world’s largest fisheries, found a 2020 report from UNEP and partners titled Out of the Blue: The Value of Seagrass to the Environment and to People. The survival of many species, such as turtles, seahorses, manatees and dugongs, depend on these meadows.
Thanks to its leafy underwater canopy, seagrass also provides shelter for countless small invertebrates, such as crabs and shrimp, as well as many species of algae and bacteria.
Seagrass filters water for corals,
a biodiversity hotspot
Often called ‘nature’s water filter,’ seagrass meadows were described as a super ecosystem in the Out of the Blue report.
They help clean water by trapping carbon-rich sediments and absorbing nutrients and pathogens. Seagrass-dominated systems oxygenate water through photosynthesis, improving water quality and stoking coral growth.
Seagrass meadows create biodiversity hotspots by providing habitat and nutrients for countless species.
Due to its sensitivity to a range of stressors and contaminants, seagrass is an early indicator of the ecological health of coastal areas. When seagrass suffers, so does biodiversity.
Seagrass supports fisheries
and livelihoods around the world
Seagrass is similar to terrestrial plants in that it has leaves, flowers, seeds, roots and connective tissues.
As such, it is an important food source for fish, octopuses, shrimp, oysters, clams and squid, underpinning fisheries that support hundreds of millions of people around the world, according to the Out of the Blue report.
In Tanzania, for instance, a decline in seagrass was found to have a negative impact on the livelihoods of women who collect invertebrates, such as clams, sea snails and sea urchins.
Seagrass is important for non-marine species, too
During their autumn migration, some geese and ducks graze on seagrasses poking out from coastal sediments. Other birds forage for invertebrates in the often shallow waters that surround the plants.
In December 2022, world leaders agreed to the Montreal-Kunming Global Biodiversity Framework, a pact designed to protect the diversity of life on Earth and ward off a looming extinction crisis.
Carvalho said that as countries develop their national targets under the agreement, they must include protection for seagrass meadows.
“Seagrass meadows support a stunning array of life and safeguarding them is vital if we’re going to meet our global goals on biodiversity–and we have to,” she said.
Seagrass is an antidote to climate change
Often referred to as a type of blue forest, seagrass meadows, much like their terrestrial counterparts, help to counter climate change. Even though these meadows cover only 0.1 percent of the ocean floor, they are highly efficient carbon sinks, storing up to 18 percent of the world’s oceanic carbon, found the Out of the Blue report.
Seagrass also acts as the first line of defense along coasts by reducing wave energy, protecting people from the increasing risk of floods and storms. UNEP News
