Seagrass meadows show resilience to ‘bounce back’ after die-offs
In Florida alone, thousands of acres of marine seagrass beds have died. Major seagrass die-offs also are occurring around the world. Stressors such as high temperature, hypersalinity and hypoxia or lack of oxygen affect seagrasses’ ability to resist and recover from these stressor-related mortality events or when disturbances lead to seagrass die-off events. Seagrass die-offs also are linked to exposure to sediment-derived hydrogen sulfide, a well-known phytotoxin that accumulates as seagrass ecosystems become more enriched in nutrients. While hydrogen sulfide intrusion into seagrass tissue is considered a leading cause of recurring mortality events, its effects on subsequent recruitment and distribution of new populations is unclear. Moreover, few studies have examined the ability of seagrass meadows‘ resilience to “bounce back” and recolonize in open bare patches. Researchers from Florida Atlantic University, in collaboration with the South Florida Water Management District, Coastal Ecosystems Division, examined if porewater hydrogen sulfide prevents Thalassia testudinum, a dominant tropical Atlantic-Caribbean marine seagrass known as turtlegrass, from recruiting into unvegetated sediment in Florida Bay. The bay is an estuary that covers about 1,100 square miles between the southern tip of Florida and the Florida Keys and is one of the largest global contiguous seagrass systems. Since the 1980s, seagrass meadows in Florida Bay have experienced repeated biomass losses, including massive die-off events of turtlegrass, which typically occur during high temperature and salinity conditions in the northcentral and western bay. The bay provided an excellent case-study site due to high porewater hydrogen sulfide and expansive unvegetated areas adjacent to intact meadows that are recolonized by turtlegrass recruits following morality events. For the study, researchers examined the leaf, stems and root tissue of turtlegrass in Florida Bay to establish tissue exposure to hydrogen sulfide in new recruits and measured internal hydrogen sulfide and oxygen dynamics using cutting-edge microsensors in the field and stable isotope analyses. Results, published in the journal Aquatic Botany, provide evidence that turtlegrass can successfully recruit into open bare sediment following die-off events due to biomass partitioning—a process by which plants divide their energy among their leaves, stems, roots and reproductive parts—during early development, young root structure, and an ability to efficiently oxidize internally, which lowers hydrogen sulfide exposure. However, recovery of seagrass meadows takes time. “Long-term monitoring programs in Florida Bay indicate that the time frame for full recovery of turtlegrass meadows after major die-off events is at least a decade,” said Marguerite Koch, Ph.D., senior author and a professor of biological sciences in FAU’s Charles E. Schmidt College of Science. “Therefore, preventing large-scale seagrass mortality events should be the management goal, particularly as global warming and associated stressors are likely to get more extreme in the future.” Findings of the study indicate that recruiting shoot resistance to hydrogen sulfide exposure is linked to adequate oxidation of internal tissue during the day through late afternoon via photosynthesis and internal plant oxidation promoted by water column oxygen diffusion into the leaves at night, driven at times by tides. Limited belowground root development in new recruits potentially constrains microbial community development and associated sulfate reduction that decrease hydrogen sulfide intrusion into roots and negatively affecting sensitive growing tissue at the base of the seagrass leaves. “Seagrass meadows sustain coastal ecosystems by protecting against erosion, maintaining water quality and providing habitat and food for many marine species and organisms,” said Koch. “Because of their importance in coastal communities, the current decline of seagrass ecosystems on a global scale across geographic regions is a concern.” More information: K. MacLeod et al, Resilience of recruiting seagrass (Thalassia testudinum) to porewater H2S in Florida Bay, Aquatic Botany (2023). DOI: 10.1016/j.aquabot.2023.103650
Ben Jones appointed as President of the World Seagrass Association
Dr Benjamin Jones, Chief Conservation Officer at Project Seagrass has started his two-year term as President of the World Seagrass Association (WSA). He steps up to the role having been elected at the WSA Annual General Meeting (AGM) in December 2022. Prior to this he’s served on the WSA Steering Committee for a number of years. “I’m so thrilled to take on this challenge alongside the management committee consisting of Vice President Emma Jackson, Treasurer Yi Mei Tan and Secretary Len McKenzie, as well as the Steering Committee who will share collective responsibilities in determining and delivering the strategic direction of the association and providing oversight,” says Ben. Four years of achievement Outgoing president, Dr Jessie Jarvis of the University of North Carolina Wilmington, brought her term to a close with the Associations AGM in December. “I have had the privilege of serving as the WSA president during a time of unprecedented change and uncertainty,” said Jessie. “The challenges we faced as a global community during the pandemic were only eclipsed by the overwhelmingly creative ways that our membership worked together to continue the WSA mission. Some highlights of our achievements over the last four years include supporting Sri Lanka and their global partners to have World Seagrass Day officially recognized by the UN, introducing a seminar series while also providing a new way for members to connect, and working with the ISBW Organizing Committee to ensure that not only ISBW 14 but future ISBW meetings, continue to bring us together.” During Jessie’s presidency the Association has: Endorsed and contributed to the report, Out of the Blue: The Value of Seagrasses to the Environment and to People, released by the United Nations Environment Programme (UNEP) together with GRID-Arendal and UNEP’s World Conservation Monitoring Centre (UNEP-WCMC). Launched the WSA Seagrass Seminar Series in response to the COVID-19 Pandemic, assembling eight researchers from across the globe to deliver 5 different talks and panel discussions from seagrass communication to ocean acidification. Welcomed and supported the decision of the UN General Assembly to adopt a resolution from the government of Sri Lanka to recognise March 1st as World Seagrass Day. Supported the 14th International Seagrass Biology Workshop & 2022 World Seagrass Conference in Annapolis, MD, USA, the theme of which was “Signs of Success: Reversing the Course of Degradation.” Provided financial support to 10 students in order to attend ISBW14. Achieved a 12% growth in membership numbers. A presidential vision Ben is looking to start his presidency on the front foot. “As part of the steering committee for many years, I’ve seen what a well-run ship the WSA is and how much it can achieve. Just look at the last four years,” he says. “I’ve also realised how quickly the years pass, so if I’m to have a contribution, it’s vital that I have a vision early on.” Ben is determined that the seagrass community steps up and plays a full role in efforts to combat the biodiversity and climate crisis. “The current decade will be transformative, it needs to be,” he says. “There is now broad awareness across society of the desperate need to halt the decline in nature, and seagrass in particular. We have political will and businesses wishing to participate. For probably the first time, seagrass is now up there with coral reefs and forests in public perception. We currently sit within the UN Decade on Ecosystem Restoration and the UN Decade of Ocean Science for Sustainable Development, and as a membership we need to build on the momentum achieved in the past four years and do our part to support these global movements.” However, while there is now more will to protect nature and more resources available, experience of achieving seagrass conservation and restoration at scale is limited. Ben believes that this is where the members of the WSA must play their part. “We need ambitious plans, and they must be socially- and ecology-informed and evidence-rich. They need to be science backed” he says. Amplifying voices and providing a platform for new growth Ben wants to work to amplify underrepresented voices within the seagrass science, conservation, restoration, and management community, as well as continue with efforts to develop the WSA as the expert voice for seagrass. “We need work to make WSA more inclusive and relevant for its membership, particularly students, to foster a stronger community and continue to raise the profile of seagrass science to meet ever increasing societal and environmental challenges,” he says. “I’d also like to explore opportunities for supporting global seagrass science, conservation and restoration through a small grants scheme for students and young professionals,” he says. “We must endeavour to give individuals from under-represented groups opportunities. In that sense, I see the WSA like a gym, the more effort we put in as a community, the more rewards we’ll see and a community.”
Seagrass crucial to stemming the tide of coastal erosion
The sea devours large tracts of land when storms wash sand out to sea from the coast. A new study involving a researcher from the University of Gothenburg has shown that seagrass can reduce cliff erosion by up to 70% thanks to its root mats binding the sand. Coastal erosion is a global problem that is often combated by replenishing the coast and beaches with new sand in locations where storms wreak the greatest havoc. According to a 2016 survey conducted by the Geological Survey of Sweden, 12% of Skåne’s coastline in southern Sweden is vulnerable to increasing rates of coastal erosion. It is an even bigger issue in other countries. In the Netherlands, the coastline is protected through the construction of dikes made from stone and mud. Another solution is to utilize nature’s own defenses against coastal erosion. In this new study, researchers examined the importance of seagrass for preserving the coastline. “We have seen that seagrass meadows in the coast are valuable assets in mitigating erosion. We already know that their long canopies serve as breakwaters, but now we can show that their root mats also bind together the underwater sand dunes, effectively reinforcing them,” says Eduardo Infantes, a marine biologist at the University of Gothenburg and the lead author of the study which has been published in the journal Marine Ecology Progress Series. More powerful storms in the future Common eelgrass is a seagrass species that grows along Sweden’s coasts, and there are areas with large seagrass meadows growing on the bottom sediments, such as in Skåne. In other places, the seagrass has disappeared altogether. This not only represents an ecological loss, it can also mean that the coast becomes more vulnerable to erosion. As the climate changes, storms risk becoming more powerful, which in turn can lead to an increase in coastal erosion. Approximately 8% of the world’s population live in areas at an elevation of fewer than 10 meters above sea level. Rising sea levels may see many people affected by coastal erosion. “This is why it is even more important to preserve those seagrass meadows that still exist today and to replant seagrass in those places where it has disappeared. In our research, we have made successful attempts to restore common eelgrass meadows on the Swedish west coast, but if such replanting efforts are to succeed, there is a need for detailed studies of the current status seabed environment,” says Eduardo Infantes. In this study, the researchers took samples of sandy sediments with and without common eelgrass from a number of sites and placed them in a large tank capable of simulating waves. The experiments demonstrated that the sand is eroded far less by waves when seagrass is growing in it. The researchers also took samples from muddy seabeds but found that the effect of the seagrass there was less. However, this matters less since muddy seabeds are most commonly found in fjords and other areas that are less exposed to waves. More factors in field tests The next step will be to move out of the laboratory environment and take measurements of sand erosion on an exposed shoreline along the coast. Other factors such as currents, traffic on the water, inflows from rivers etc. can then affect the erosion. “It’s more complicated in the field, but we have created realistic storm waves in our experiments and the seagrass has clearly shown a protective effect against erosion. I think we will be able to demonstrate the similar effects in field tests,” says Eduardo Infantes. More information: E Infantes et al, Seagrass roots strongly reduce cliff erosion rates in sandy sediments, Marine Ecology Progress Series (2022). DOI: 10.3354/meps14196
Legacy of ancient ice ages shapes how seagrasses respond to environmental threats today
Deep evolution casts a longer shadow than previously thought, scientists report in a new paper published the week of Aug. 1 in the Proceedings of the National Academy of Sciences. Smithsonian scientists and colleagues looked at eelgrass communities—the foundation of many coastal marine food webs along the north Atlantic and Pacific coasts—and discovered their ancient genetic history can play a stronger role than the present-day environment in determining their size, structure and who lives in them. And this could have implications for how well eelgrasses adapt to threats like climate change. About a half-million years ago, when the world was warmer, some eelgrass plants made the difficult journey from their homes in the Pacific to the Atlantic. Not all the plants were hardy enough to make the journey across the Arctic. For those that succeeded, a series of ice ages during the Pleistocene Epoch further affected how far they could spread. Those millennia-old struggles left lasting signatures in their DNA: Even today, eelgrass populations in the Atlantic are far less genetically diverse than those in the Pacific. Still, in the classic “nature versus nurture” debate, scientists were stunned to discover that genetic legacy sometimes does more to shape modern eelgrass communities than the current environment. “We already knew that there was big genetic separation between the oceans, but I don’t think any of us ever dreamed that that would be more important than environmental conditions,” said Emmett Duffy, marine biologist with the Smithsonian Environmental Research Center and lead author of the report. “That was a big surprise to everybody.” Eelgrasses in hot water Eelgrass is among the most widespread shallow-water plants in the world. Its range spans from semi-tropical regions like Baja California all the way to Alaska and the Arctic. Besides providing food and habitat for many undersea animals, eelgrass offers a plethora of services to humans. It protects coastlines from storms, soaks up carbon and can even reduce harmful bacteria in the water. But in most places where it grows, eelgrass is the dominant—or only—seagrass species present. That makes its survival critical to the people and animals that live there. And the lower genetic diversity in the Atlantic could make it hard for some populations to adapt to sudden changes. “Diversity is like having different tools in your tool belt,” said Jay Stachowicz, a co-author and ecologist with the University of California, Davis. “And if all you’ve got is a hammer, you can put in nails, but that’s about it. But if you have a full complement of tools, each tool can be used to do different jobs more efficiently.” Ecologists have already seen eelgrass disappearing from some regions as the waters heat up. In Portugal, its southernmost spot in Europe, eelgrass has begun pulling back and moving farther north, into cooler waters. “I don’t think that we’re going to lose [eelgrass] in the sense of an extinction,” said co-author Jeanine Olsen, an emeritus professor at the University of Groningen in the Netherlands. “It’s not going to be like that. It’s got lots of tricks up its sleeve.” But local extinctions, she pointed out, are going to occur in some places. That could leave regions that depend on their local eelgrass in trouble. Reaching a more ZEN worldview Realizing the urgent need to understand—and conserve—eelgrass worldwide, Duffy and his colleagues banded together to form a global network called ZEN, which Project Seagrass was a partner of. The name stands for Zostera Experimental Network, a nod to eelgrass’s scientific name, Zostera marina. The idea was to unite seagrass scientists all over the world, doing the same experiments and surveys, to get a coordinated global picture of seagrass health. For the new study, the team studied eelgrass communities at 50 sites in the Atlantic and Pacific. With 20 plots sampled per site, the team came away with data from 1,000 eelgrass plots. First they collected basic eelgrass data: size, shape, total biomass and the different animals and algae living on and around them. Then they collected genetic data on all the eelgrass populations. They also measured several environmental variables at each site: temperature, the water’s saltiness and nutrient availability, to name just a few. Ultimately, they hoped to discover what shaped eelgrass communities more: the environment or the genetics? After running a series of models, they discovered a host of differences between the Atlantic and Pacific eelgrass ecosystems—differences that closely aligned with the genetic divergence from the Pleistocene migration and subsequent ice ages. While Pacific eelgrasses often grew in “forests” that regularly surpassed 3 feet tall and sometimes reached more than twice that high, the Atlantic hosted more diminutive “meadows” that rarely came close to that height. The genetic differences also aligned with the total biomass of eelgrass. In the Atlantic, evolutionary genetics and the present-day environment played equally strong roles in eelgrass biomass. In the Pacific, genetics had the upper hand. These impacts flowed up to other parts of the ecosystem as well. When it came to small animals that lived in the eelgrass, like invertebrates, the genetic signature from the Pleistocene again played a stronger role than the environment in the Pacific—while the two played equally strong roles in the Atlantic. “The ancient legacy of this Pleistocene migration and bottleneck of eelgrass into the Atlantic has had consequences for the structure of the ecosystem 10,000 years later,” Duffy said. “Probably more than 10,000.” Conserving the future That ancient genetics can play such a strong role—sometimes stronger than the environment—has some ecologists concerned about whether eelgrass can adapt to more rapid changes. “Climate warming—by itself—is probably not the primary threat for eelgrass,” Olsen said. Pollution from cities and farms, which can cloud the water and lead to harmful algal blooms, also endangers seagrasses. That said, the vast array of environments eelgrass can survive in testifies to its hardiness. “I’m hopeful because our results illustrate long-term resiliency to repeated, major changes in thermal tolerances and the wide range of eelgrass habitats over about half the Northern Hemisphere,” Olsen said.
Seagrass meadows are reliable fishing grounds for food
A new study shows that seagrass fisheries provide a reliable safety-net for poor fishermen, since they perceive those habitats to maintain large fish catches over time. Surprisingly, even more so than coral reef fisheries, which people normally associate with small-scale fishery. Seagrass meadows are routinely used as a fishing habitat across the Indo-Pacific region to sustain millions of households by providing fish and other animals for food and income from fishing. A new study in Ocean and Coastal Management investigated how and why households use seagrass meadows across Cambodia, Tanzania, Sri Lanka and Indonesia in the Indo-Pacific region by conducting interviews that asked what habitats they used and which they preferred. Benjamin Jones, director of Project Seagrass and PhD student at the Department of Ecology Environment and Plant Sciences, Stockholm University, says: “Seagrass was the most common habitat used for fishing. Nearly half of all households we talked to preferred fishing in seagrass over other habitats such as coral, mangroves, open ocean, mud and rock for example. This was surprising because most people think of reef fisheries as the key tropical small-scale fishery, but we show that its actually engagement in seagrass fisheries that are much more characteristic of households.” When the researchers asked the fishermen why they preferred seagrass, they expressed a general feeling of reliability: seagrass meadows always provide large catches and fish and invertebrates are always found there. This is likely due to the ecological role that seagrass meadows play for fish. They provide valuable nursery habitats with lots of places for fish to hide and grow which means that there is often a high abundance of fish present. The study also revealed that 3 in 20 people across the region were reliant on seagrass meadows as their fishing ground and did not fish anywhere else. The research from households in 147 villages also revealed that reliance on seagrass meadows was strongly influenced by household income: “Household income had two different effects. On one hand, poorer households were less likely to own motorboats. These were reliant on seagrass as they were unable to fish elsewhere, seagrass is close to shore and easy to access without a motor. On the other hand, wealthier households were more likely to own certain types of fishing gear that incentivized them to use seagrass due to high rewards and low effort requirements. These were static fishing fences that don’t require a fisherman to be present” says Benjamin Jones. Study co-author and fellow Project Seagrass director Leanne Cullen-Unsworth, says “Our results highlight the need for empirical household scale data for management of seagrass meadows. People use and value seagrass for many different reasons so safeguarding seagrass is vital to ensure that all people, all of the time, have equitable and equal access to the resources seagrass provides.” The study was a collaboration between scientists from Stockholm University, Project Seagrass, Swansea University, Uppsala University, Hasanuddin University, among others. Open Access paper: Jones, B.L.H.; Unsworth, R.K.F.; Nordlund, L.M.; Eklöf, J.S.; Ambo-Rappe, R.; Carly, F.; Jiddawi, N.S.; La Nafie, Y.A.; Udagedara, S.; Cullen-Unsworth, L.C. Dependence on seagrass fisheries governed by household income and adaptive capacity. Ocean & Coastal Management 2022, 225, doi:10.1016/j.ocecoaman.2022.106247.
Communities are central to conservation
[vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][vc_column_text]Earlier this week saw the release of the Edinburgh Declaration on post-2020 global biodiversity framework, a bold call to action urging Parties to the Convention on Biological Diversity to work more closely with communities in order to meet 20 biodiversity goals set out in the Aichi accord, signed 10 years ago in in Nagoya, Japan. The vision set out in the post-2020 global biodiversity framework of “Living in harmony with nature”, and the 2030 mission as set out in the Zero Draft document make one thing pretty clear. Conserving biodiversity, for people and the planet, cannot happen without people. [/vc_column_text][/vc_column][/vc_row][vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][image_with_animation image_url=”8962″ alignment=”center” animation=”Fade In” border_radius=”none” box_shadow=”none” max_width=”100%”][/vc_column][/vc_row][vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][vc_column_text]For me, the past few years have been pretty key in re-shaping what conservation truly is. The principal top-down conservationist architype, imposed by scientists and NGOs for decades, has been replaced by measures that include the rights and needs of local communities. Placing humans within ecosystems, rather than apart from them, is key if we are to live in harmony with nature. Back in 2013, my initial visions for what Project Seagrass should exist to achieve were purely natural. Not for people, but for seagrass sake. Of course, there’s nothing wrong with being so passionate about an organism that you simply don’t want to see it lost. But what I missed and what I failed to see back then was how important seagrass meadows were to communities. The more time I’ve spent with communities that live by and utilise seagrass meadows, the more I’ve realised how we as humans have re-shaped nature. We’ve become a central part of the ecosystem. In some ways, our goals to return nature to a “pristine” state is naïve. We’re blind to the fact we don’t really know what pristine is. But, more worryingly, our view of a pristine environment, is one without humans. This why I now focus on evidencing this with my own research, showing just how central communities are to conservation and sustainability goals, and how ignoring them actually undermines conservation and sustainability goals themselves.[/vc_column_text][/vc_column][/vc_row][vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][vc_column_text]It’s all well and good setting time-bound targets and making specific promises and commitments. These are useful as motivational goals to help drive action in tackling biodiversity loss, but what has been holding us up, what has been putting on the brakes, is our inability to recognise people as part of the solution. The Edinburgh Declaration on post-2020 global biodiversity framework recognises this, and why I fundamentally support its call to action. At Project Seagrass, this has been on our mind lately. Without the partnerships we’ve made with communities, our projects could not be possible. Seagrass Ocean Rescue for example is just as much communities doing conservation as it is conservation for communities. We’ll be build on this as we move forward with the post-2020 global biodiversity framework.[/vc_column_text][/vc_column][/vc_row][vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][image_with_animation image_url=”7689″ alignment=”” animation=”Fade In” border_radius=”none” box_shadow=”none” max_width=”100%”][/vc_column][/vc_row]
It’s an ill bird that fouls its own nest
[vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][vc_column_text] Nearly 30,000 tonnes of sewage containing human waste is to enter the UK despite potential problems for human health. Yet, what stinks for me is that sewage and livestock waste are driving seagrass loss across the UK – we already have a problem, and we don’t need to exacerbate this. Back in 2018, we released a study documenting this problem and called on the government to make changes – but water companies, some farmers and the Government have not, and it would appear are still not, doing enough to address theses risks. While the EU’s landmark legislation to improve bathing water quality has been a success in many places, much of what we do in the UK is woefully insufficient. Many seagrass meadows around the UK are in areas with designated EU protection. Protection on paper, but not in practice. Many seagrass meadows around the UK are polluted with nutrients derived from human sewage and livestock waste. Adding excessive amounts of nutrients to the environment, like spreading sewage liberally over fields, leads to those nutrients leeching out and into our rivers. Transported downstream to our coasts, these nutrients are a nightmare for seagrass leading to excessive growth of tiny algae called epiphytes which smother seagrass, leading to its death. Dead seagrass means no carbon sequestration, and in many cases dead seagrass means carbon emissions. Dead seagrass also means a loss of habitat for juvenile fish such as cod, herring and plaice, and dead seagrass means no coastal protection. Sewage puts all the benefits that seagrass provide to humans at risk. Farming is likely the UK’s leading cause of water pollution. Inefficiencies in the storage and disposal of sewage slurry mean that it ends up in rivers and coastal waters. Dr Andrew Singer, a senior scientist at the world-renowned Centre for Ecology and Hydrology, has said that there are no rivers in the UK that is safe to be swimming in. It’s clear then that there are some pretty systematic issues in the way we deal with sewage and livestock waste across the UK. Add on top of this the health issues that even the Environment Agency themselves acknowledge and you have a recipe for something that stinks. At the moment, we really don’t know whether spreading human sewage is safe or not for our food, according Alistair Boxall, a professor in environmental science at the University of York. It’s an ill bird that fouls its own nest.[/vc_column_text][/vc_column][/vc_row]
Mosquito nets: Are they catching more fishes than insects?
Mosquito nets designed to prevent malaria transmission are used for fishing which may devastate tropical coastal ecosystems, according to a new scientific study. The researchers found that most of the fish caught using mosquito nets were smaller than a finger and potentially collect hundreds of individuals. Malaria is a serious global health issue, killing nearly half a million people every year worldwide. Aid organisations like the Bill and Melinda Gates Foundation have invested in solutions to solve the crisis such as distributing hundreds of thousands of bed nets to protect people from mosquito bites carrying the virus. “Distributed mosquito nets are intended to be used for malaria protection, yet communities living in poverty use them for fishing, providing fresh concerns for already overfished coastal ecosystems, says,” Benjamin Jones, a director of Project Seagrass and PhD researcher at Stockholm University Department of Ecology, Environment and Plant Sciences. There are few studies that investigate how much fish mosquito-net fishing potentially harvests, although the use of mosquito nets for fishing is not a new phenomenon: “No evidence on the sheer amount of fish that these fisheries extract has been published that we are aware of. Gaining an understanding of these catches is vital if we are to manage such fisheries,” says Benjamin Jones. In Mozambique, each sweep of the mosquito net caught more than half of the average daily catch (2.4 kg a day) using traditional nets, by weight. But many of the fishes were very small, which means mosquito net fishers who cast their nets many times each day are removing a huge number juvenile fish to eat. Many of the species caught are important for food in the region when adults or help keep the seagrass ecosystems where they are found healthy. “The use of mosquito nets for fishing may contribute to less food availability, greater poverty and the loss of ecosystem functioning,” concludes Dr Richard Unsworth, a co-author and Lecturer in Marine Biology at Swansea University. Finding a solution to the problem is incredibly hard, but the researchers suggest the need for marine scientists, social scientists, health professionals and fishing communities to all work together. Laws imposed from governments make the use of mosquito nets for fishing illegal in some localities, however, such mechanisms are evidently insufficient because people still need food and “need re-thinking” according to the study. “We need to know why communities aren’t using these nets for intended use, and therefore we have to involve them, so they can be part of developing solutions to these challenges,” says Richard Unsworth. The team collected data at seagrass meadows by ten coastal villages in northern Mozambique. Identifying each fish species, the researchers recorded the weight of each fish group and the total catch, as well as age and where they are positioned in the food web. The open access paper – “The perverse fisheries consequences of mosquito net malaria prophylaxis in East Africa” – is published on Monday 11th November at https://doi.org/10.1007/s13280-019-01280-0
International Women’s Day 2018: A call to #PressforProgress in recognising the role of women in fisheries
Today on international women’s day 2018 we collectively acknowledge and celebrate women’s achievements throughout history and across nations. It is also known as the United Nations (UN) Day for Women’s Rights and International Peace. Absolutely a day for shared and international celebration. Throughout history and across the world women have fought and continue to fight for equality. We are the individuals, mothers, grandmothers, great grandmothers, sisters, aunties and wives who support ourselves, our families, our friends, our countries and our planet for the most part with quiet affection and definitely not for reasons of recognition or wider acknowledgement. But it is important to recognise and acknowledge the role and achievements of all women, particularly those who are the silent backbone of their communities, where neither support nor recognition is widely offered. I could choose any number of amazing women to focus on here but would like to, very briefly, just draw attention to the women who play a significant yet quiet role in the world’s fisheries. Women play a significant role in fisheries across the globe Women (and children) are key providers for their families and communities across the globe though the work they do gathering seafood for food and for income. The fisheries involving women and children are generally low tech with minimal or no gear often where seagrass and reef flats are ‘gleaned’ by hand at low tide to collect valuable invertebrates (and sometimes fish) for food and for sale. These women and these fisheries remain ill acknowledged and unsupported by local, regional or international efforts to manage and maintain the sense of food security that they convey. But they make up a significant proportion of the small-scale artisanal fisheries that collectively contribute up to one quarter of the total global catch. These women work tirelessly to maintain a way of life or simply to provide protein and nutrition for their families. These are voices that need to be heard and have a significant role to play in the management and maintenance of local scale fisheries. A woman gleans at low tide in Indonesia These often ignored fishers can teach us all a lot about a lot of things, their ecological knowledge, dedication and hard work is something we could all learn from. So this year I would like to celebrate and acknowledge these women on this important day. I would also like to acknowledge and celebrate the amazing women who have always worked hard, led by example, encouraged (without question) and helped shape my own life (‘no matter what’). I am privileged to have and to have had these women in my life. Happy International Women’s Day!
Waste Not, Want Not. Discards that could feed those in poverty
At least 7.3m tons of fish (usually dead or dying) are thought to be discarded each year from marine fisheries around the world. But these estimates come mostly from observations of large-scale industrial fisheries. Limited attention has been paid to small-scale fisheries, which are assumed to have low discard rates – some estimate as little as 3.7% total catch, compared to more than 60% for some large-scale shrimp trawlers. Small-scale or artisanal fisheries – for which there is no universal definition – are generally considered more sustainable than their large-scale industrial counterparts, but there is increasing evidence that shows this is not always the case. They employ more than 99% of the world’s 51m fishers and likely account for more than half of the total global fisheries catches. A Sri Lankan fisherman. One of the biggest problems for both large and small-scale fisheries around the globe is bycatch – fish and other marine organisms caught when the fishers are targeting something else. Powerful images of turtles and dolphins caught in fishing gear have caught the sympathy of the general public, but unintentional landings of fish aren’t as evocative. The truth is, however, that fish bycatch is a big issue. Progress is being made in Europe within large-scale fisheries thanks to campaigns such as the Fish Fight. But small-scale fisheries – though there is increasing recognition outside that they are “too big to ignore” – are only just beginning to recognise the fish bycatch and discard problem. Catch and bycatch. Our newly published research has found that artisanal fisheries in Sri Lanka are throwing away more marine species than they keep. For every fishing trip in one of Sri Lanka’s largest lagoons, Puttalam Lagoon, fishermen could be throwing away more than 50 fish. What’s more, of the 62 species recorded in the survey, more than 80% were routinely discarded. The reasons for this practice are unclear but sometimes it is because the individual fish are too small – or they are species without a high market value. We found that fishers targeting shrimp in particular caught more non-target species and had higher discards than those targeting fish. This is particularly worrying at a time when Sri Lankan shrimp exports are increasing, after the EU granted the country improved access to its market. Fishers in Puttalam Lagoon discard non-target catch onshore. Potentially 90% of the world’s fish stocks are threatened by over-fishing – when more fish are caught than the population can replace. And the “tell-tale” signs of over-fishing are now being observed in Sri Lanka and across other research sites in the Indo-Pacific region. Fishers in these locations have told us and other researchers that they are catching much less fish than they were five years ago. But this is not just an ecological issue, it is a social one too. In this era of increasing food insecurity, our findings highlight a serious concern for Sri Lanka. This unwanted seafood could be used to provide protein for the poorest in society. Instead, we found that fish with high nutritional value is being eaten by feral dogs and birds. Unwanted fish end up as quick and easy meals for animals. Billions of people worldwide rely daily on fish for protein, while 50m people also rely on catching fish for work. But, if the levels of bycatch and discard continue, the livelihoods and food security of the people that depend on these fisheries will be under threat. If the problem is not managed, there won’t be any fish left in the waters. There is one ray of hope for Sri Lanka, however. There are some small-scale fishery cooperatives which maximise long-term community benefits by dealing with the threats of fisheries mismanagement, livelihood insecurity and poverty. Communities with successful and inclusive cooperatives are better off than those without. Cooperatives have the potential to empower small-scale fishers against environmental and socioeconomic shocks, but the problem in Puttalam Lagoon is that these cooperatives are not operating across all levels of society. Fishing cooperatives do exist, but there could be more. If the bycatch and discards issue is going to be solved over the long-term, we need to look at combining sustainable management practices with community schemes to reduce unnecessary seafood waste all over the world. Together the millions of small-scale fishers all over the world have an immense amount of power, they just need to realise it. This article was originally published on The Conversation. Read the original article.