{"id":1956,"date":"2022-01-27T12:58:38","date_gmt":"2022-01-27T12:58:38","guid":{"rendered":"https:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=1956"},"modified":"2022-01-27T12:58:38","modified_gmt":"2022-01-27T12:58:38","slug":"scientists-turn-underwater-gardeners-to-save-precious-marine-plant","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/1956\/scientists-turn-underwater-gardeners-to-save-precious-marine-plant\/","title":{"rendered":"Scientists turn underwater gardeners to save precious marine plant"},"content":{"rendered":"

Whoever said there\u2019s nothing more boring than watching grass grow, wasn\u2019t thinking about seagrass. Often confused with seaweeds and rarely receiving the attention they deserve, there\u2019s nothing boring about seagrasses. In fact, they are one of the most productive ecosystems in the world.<\/strong><\/p>\n

Next time you are swimming and enjoying the sea\u2019s cool embrace look down and try to spot the slender blades of seagrass, a remarkable marine plant that plays a vital role in the coastal environment but is now under threat.<\/p>\n

Forming dense underwater meadows, seagrasses are vital to maintain fisheries, absorb carbon and protect coastlines from erosion \u2013 but their future is threatened by climate change, pollution and other impacts of human activities, scientists say.<\/p>\n

The plants grow in shallow coastal waters in all regions except the Antarctic. They act as nurseries or feeding grounds for hundreds of species of seafood, including sea bream, octopus, cuttlefish and Alaska pollock – one of the most\u00a0fished species<\/a>\u00a0in the world.<\/p>\n

In the Mediterranean alone at least\u00a030%<\/a>\u00a0of the value of commercial fisheries landings comes from fish that rely on seagrass for food and protection while they are young. They also provide important fishing grounds for recreational fishing.<\/p>\n

\u2018Despite covering a very low proportion of our ocean floor, they make a significant contribution to fisheries and local economies,\u2019 said Marija Sciberras, assistant professor of fisheries conservation at Scotland\u2019s Heriot Watt University.<\/p>\n

Dr Sciberras studied seagrass meadows in Mallorca as part of a project called\u00a0PIONEER<\/a>. She found that fish had higher body mass in areas with higher density of seagrass.<\/p>\n

But the growth rate of juvenile fish was higher in areas with lower density of seagrass. This could be because they need to grow fast because they are more exposed to predators, she said.<\/p>\n

Seagrass stress<\/strong><\/p>\n

Seagrass species globally are facing growing stress caused by human activities. The underwater meadows are sometimes ripped up to make way for new port infrastructure, dykes, or seawalls \u2013 even though the plants protect coastlines from storm erosion.<\/p>\n

In regions where seagrasses are protected by law \u2013 including the European Union \u2013 they must be reforested if this happens. But attempts to do so often fail, said Francesca Rossi, senior researcher at France\u2019s National Centre for Scientific Research (CNRS) at the University of C\u00f4te d’Azur.<\/p>\n

\u2018They try to plant seagrasses in areas where they weren’t before\u2019 \u2013 locations which are not their natural habitat \u2013 said Dr Rossi, who is coordinator of\u00a0HEALSEA<\/a>\u00a0project.<\/p>\n

Seagrasses can also be uprooted by boats which anchor over them or drag fishing equipment through them, leaving bare sediment behind. It can take years for them to recover.<\/p>\n

HEALSEA researcher Laura Soissons studied the impact of yet another stressor that affects seagrass: pollution from fertilisers. This can reduce the amount of light reaching seagrass leaves and slow their growth.<\/p>\n

Dr Soissons found that seagrasses often show no obvious signs of stress until they pass a tipping point after which they suddenly collapse.<\/p>\n

Researchers want to find ways to spot signs of stress in the plants before they reach that tipping point. These could be used help to protect seagrasses \u2013 and other species, said Dr Rossi.<\/p>\n

The impact of declining meadows on fish species, for example, is likely to be devastating, she said. \u2018If we don’t have a habitat where the species can feed, hide or reproduce \u2026 this species is lost.\u2019<\/p>\n

\u2018Seagrass is fundamentally important for all coastal ecosystems and for humans, because they create life, they protect life and they protect from coastal erosion,\u2019 she added.<\/p>\n

Despite the crucial role they play, data on the existence and decline of seagrass meadows is limited. However, a picture is emerging of plants struggling to survive in many regions.<\/p>\n

One\u00a0study<\/a>\u00a0in the Mediterranean found that between 13% and 50% of the areal extent of one species \u2013 Posidonia oceanica \u2013 was lost between 1842 and 2009. The remaining meadows may have lost much of their shoot density and become more fragmented.<\/p>\n

Globally, rates of seagrass decline average about\u00a07% a year<\/a>\u00a0according to another study.<\/p>\n

Carbon sink<\/strong><\/p>\n

Any decline in seagrass could affect oceans\u2019 ability to absorb carbon.<\/p>\n

Seagrass meadows absorb carbon up to 35 times faster than tropical rainforests, according to\u00a0WWF<\/a>. And although they only cover 0.2% of the sea floor, they absorb 10% of the oceans\u2019 carbon each year, the conservation organisation says.<\/p>\n

Unlike many land plants, seagrasses store most of the carbon they absorb in their roots, so the carbon remains buried underground even after they die.<\/p>\n

Species which grow faster or have denser structures are particularly good at absorbing carbon. So the ocean\u2019s ability to absorb carbon is impacted both if seagrass meadows shrink in size, and if certain species are lost, said Nick Kamenos, Reader in Global Change at Britain\u2019s University of Glasgow.<\/p>\n

Climate change<\/strong><\/p>\n

And that decline could worsen with climate change, which is already warming seawaters and increasing their acidification.<\/p>\n

Dr Kamenos coordinated a project called\u00a0SEAMET<\/a>\u00a0which studied the impact of climate change on seagrasses in the Atlantic, Pacific and Indian Oceans and the Mediterranean Sea. They also tested plants in the laboratory.<\/p>\n

The researchers found that plants respond differently to temperature rises, depending on the species and their location. But many are at risk, especially those already living at the limits of their heat tolerance, said Dr Kamenos.<\/p>\n

Meadows in the Arctic are also at high risk, he said. This region is projected to have the fastest rate of warming over the century, and rapid acidification.<\/p>\n

Variable temperatures are another risk linked to climate change. Plants which have been used to stable conditions for millennia are unlikely to tolerate temperatures which change from year to year, said Dr Kamenos.<\/p>\n

The combination of rapid warming and increased variability in temperatures \u2018can push some of these systems over the edge\u2019, he said.<\/p>\n

Acidification is another threat. It damages plants and animals with calcium carbonate structures, including tiny marine plants called coralline algae which live in seagrass meadows. These algae are important in absorbing carbon.<\/p>\n

\u2018How seagrasses will respond to climate change is still not well understood,\u2019 said Dr Kamenos. \u2018But the evidence is that it’s not fantastic,\u2019 he added.<\/p>\n

One important way to help seagrasses cope with its impacts is to protect them from other stressors including pollution and damage from construction and boats.<\/p>\n

The EU has set targets to\u00a0protect 30% of its sea area<\/a>, restore marine ecosystems and curb pollution in its waters. Globally, more than\u00a070 countries<\/a>\u00a0are pushing for the\u00a0UN Convention on Biological Diversity<\/a>\u00a0to adopt a target of protecting 30% of marine waters by 2030.<\/p>\n

Improving their habitat will give seagrasses \u2018a very small amount of extra breathing space until we can get a grip on climate change\u2019, said Dr Kamenos.<\/p>\n

\u201cBut that is not an excuse to be to be lethargic about acting on climate change because there\u2026 we need to act fast,\u201d he added.<\/p>\n

The research in this article was funded by the EU. If you liked this article, please consider sharing it on social media.<\/p>\n","protected":false},"excerpt":{"rendered":"

Whoever said there\u2019s nothing more boring than watching grass grow, wasn\u2019t thinking about seagrass. Often confused with seaweeds and rarely receiving the attention they deserve, there\u2019s nothing boring about seagrasses. In fact, they are one of the most productive ecosystems in the world. Next time you are swimming and enjoying the sea\u2019s cool embrace look … Read more<\/a><\/p>\n","protected":false},"author":298,"featured_media":1957,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[11],"tags":[],"class_list":["post-1956","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-energy-environment"],"yoast_head":"\nScientists turn underwater gardeners to save precious marine plant - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/1956\/scientists-turn-underwater-gardeners-to-save-precious-marine-plant\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Scientists turn underwater gardeners to save precious marine plant\" \/>\n<meta property=\"og:description\" content=\"Whoever said there\u2019s nothing more boring than watching grass grow, wasn\u2019t thinking about seagrass. Often confused with seaweeds and rarely receiving the attention they deserve, there\u2019s nothing boring about seagrasses. In fact, they are one of the most productive ecosystems in the world. Next time you are swimming and enjoying the sea\u2019s cool embrace look ... 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