Trichodrilus longipenis

Cold-water corals, just like their tropical counterparts, build three dimensional reef structures that offer complex habitats for many different species, including commercially important fish. They form <a href="https://www.earth.com/news/climate-change-impacts-biodiversity-in-protected-areas-worldwide/">biodiversity</a> hotspots and are considered important in deep-sea ecosystem functioning, food web structure and nutrient cycling. Today, cold-water coral reefs are considered vulnerable ecosystems because they are exposed to threats from destructive fishing techniques, such as bottom trawling and towed dredges.



In addition, these corals are expected to suffer dramatically from future environmental changes in the oceans due to global warming, which may bring food shortages, decreases in oxygen availability, and acidification. However, it is difficult to predict how cold-water corals will respond to future climate changes because there is a complete lack of any data documenting local extinction events involving these corals.&nbsp;



To get around this problem, a team led by Rodrigo da Costa Portilho-Ramos of the University of Bremen made use of ancient evidence of past climate change captured in the sediments of the seabed. They analyzed sediments collected at or near six sites of cold-water coral ecosystems in the North Atlantic Ocean and the Mediterranean Sea, applying standard techniques to reconstruct ocean conditions and the abundance of the common coral species&nbsp;Lophelia pertusa&nbsp;over the last 20,000 years. This period encompasses Earth’s last major global warming event.



This approach allowed the researchers to reconstruct paleoceanographic conditions and link the proliferation or reduction of cold-water corals with changes in environmental conditions. This was possible because of the fact that cold-water coral ecosystems take a long time to develop and then are persistent over long time periods.&nbsp;



The results of the analysis are published today in the journal <a href="https://journals.plos.org/plosbiology/">PLoS Biology</a>. They show that the abundance of the cold-water coral L. pertusa&nbsp;in times gone by was most strongly correlated with changes in food supply, the tiny suspended organisms that arrive either from shallower waters above, or by lateral water flow along the seafloor. Low oxygen concentration also appeared to be a key stressor for&nbsp;L. pertusa. In contrast, changes in ocean temperature and salinity did not appear to be significantly associated with the proliferation or disappearance of&nbsp;L. pertusa&nbsp;over time.



The findings suggest that cold-water coral ecosystems are most likely to be affected in future by climate change-driven alterations to ocean processes that affect their food and oxygen supplies. In some cases, the data suggest, high abundance of food may compensate for low oxygen levels.



“Marine sediment records from the North Atlantic and the Mediterranean Sea reveal that events of growth and mortality of cold-water corals induced by climatic changes over the last 20,000 years were mainly triggered by food supply, controlled by export production and turbulent hydrodynamics, rather than by changes in the bottom-water temperature," said Portilho-Ramos.



"Therefore, climate-driven changes in oceanic processes concerning food supply are also likely to be the determining factors of life and death of cold-water coral species in the coming decades.”



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Ancient sediments predict future stressors for cold-water corals

Cold-water corals, just like their tropical counterparts, build three dimensional...

Scallops are usually caught by dredging, a destructive <a href="https://www.earth.com/news/dolphin-bycatch-from-fishing-activities-is-unsustainable/">fishing</a> method that tears up the seafloor and harms other life. Now, a study published in the journal <a href="https://www.sciencedirect.com/journal/fisheries-research">Fisheries Research</a>, shows there may be a better way.&nbsp;



A team of scientists led by the <a href="https://www.exeter.ac.uk/">University of Exeter</a> fitted lobster pots with LED lights, and used them experimentally with fishermen off the coast of Cornwall in the UK. The lights did not seem to make a difference in the amount of lobster or crabs caught in the traps. Scallops on the other hand, swam into the pots in droves.&nbsp;&nbsp;



"We were working on lights for crab and lobster pots and I gave some to a fisherman for testing," said Dr. Rob Enever of Fishtek. “He told me the lights made no difference to crabs or lobsters, but he noticed quite a lot of scallops in his pots. We decided to test this properly in this study."



"When I saw the results, I couldn't believe my eyes. Boats that would only see two or three scallops in their pots annually were now seeing 20 or more in a single pot. We have found something really astonishing here. This could be a real opportunity for crab and lobster fishers, because the lights don’t seem to reduce the number of crabs and lobsters they can catch – they just bring in an extra haul of scallops."



More than 500 scallops were caught. Of those, 99.6 percent were caught in lobster pots with lights in them. The researchers believe this breakthrough could ultimately lead to a widespread, improved method for catching scallops.



"We are delighted to be working with an excellent local company to do the science that underpins innovation that could be good for fishers and the environment," said Dr. Phil Doherty.



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Breakthrough study reveals that scallops are attracted to light

Scallops are usually caught by dredging, a destructive fishing method...

A new study from the <a href="https://www.port.ac.uk/">University of Portsmouth</a> has revealed a dramatic increase in shipping traffic in the North East Atlantic. Scientists have warned that in order to help protect <a href="https://www.earth.com/news/marine-protected-areas-are-key-for-our-future/">marine</a> life, more monitoring is needed.&nbsp;



The researchers discovered that over a five-year period, rates of shipping in the North East Atlantic rose by 34 percent. What is even more concerning to scientists is the rate of shipping growth in marine protected areas. Vessel movements in these sensitive environments have increased by 73 percent in the same time period.



The<a href="https://www.sciencedirect.com/science/article/pii/S0025326X22003630"> report</a> is the first survey of shipping activity in the North East Atlantic. Using data recorded by Automatic identification Systems (AIS), the researchers studied the change in shipping between 2013 and 2017 across ten distinct vessel types. The study area covered 1.1 million km2, including waters off Belgium, Denmark, France, Germany, Iceland, Ireland, The Netherlands, Norway, Portugal, Spain, and the UK



”This change is likely to put more pressure on the marine environment, and consequently may have implications for the conservation of exposed and at-risk species," said study lead author James Robbins. "Renewed monitoring effort is needed to ensure that protective measures are adequate to conserve species under threat in a changing environment, where the footprint of human activities is expanding.”&nbsp;



The increase in traffic may have implications for species that these areas are designated to protect. Shipping impacts on the marine environment include the spread of non-indigenous species, noise, chemical, and air pollution, collisions with wildlife, and marine litter.



Shipping is a likely cause of the unintended movement for more than half of non-indigenous species in European waters (<a href="http://eader.elsevier.com/reader/sd/pii/S0964569113000562?token=A04541237DCD04B81B24328A5914A67D8825B950B2553D5EE62F572C9611C44871C801ADE26ACD300CA7D710574DDA26&amp;originRegion=eu-west-1&amp;originCreation=20220517121528">Katsanevakis et al., 2013</a>). Once introduced, the invasive species have a negative impact on the ecosystems they invade, and are considered one of the biggest threats to biodiversity.&nbsp;&nbsp;



<a href="https://pure.sruc.ac.uk/en/persons/sarah-marley">Dr Sarah Marley</a>, Visiting Researcher at the University of Portsmouth and Lecturer at Scotland’s Rural College, said&nbsp;



“Shipping is the most widespread human activity in our oceans, carrying a multitude of threats - from subtle impacts like underwater noise pollution to dramatic outcomes when ships hit whales," said study co-author Dr. Sarah Marley. "We need to understand when and where shipping occurs in order to best mitigate these risks”.



The results found the greatest increases in shipping are taking place across multiple designated protection areas across the world.



<ul><li>In areas close to the Spanish coast, the Espacio Marino de la Costa da Morte saw a rise of 413 per cent in vessel activity. This area is designated to protect seabirds.&nbsp;</li><li>Several areas off the west coast of Scotland also saw increases of 463 per cent in shipping, a zone designated to protect harbour porpoises.&nbsp;</li><li>The Vadehavet med Ribe Å, Tved Å og Varde Å vest for Vard off the coast of Denmark, where fish, seals and harbour porpoises are protected saw a 443 per cent increase in ship movements.&nbsp;</li></ul>



As the human population continues to grow, increased demands on international trade will intensify shipping across the world. Current predictions see a global increase of 240 percent and 1209 per cent by 2050.&nbsp;



The impacts of shipping on the marine environment prove that it is crucial for policy makers to closely monitor areas that are designated to protect vulnerable species and ecosystems that will face continuous pressures over time.&nbsp;&nbsp;



The study is published in the journal <a href="https://www.sciencedirect.com/journal/marine-pollution-bulletin">Marine Pollution Bulletin</a>.&nbsp;



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By <a href="mailto:katherinebucko@gmail.com">Katherine Bucko</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Dramatic increase in shipping traffic threatens marine life

A new study from the University of Portsmouth has revealed...

The climate crisis is threatening the yellow-billed hornbill, a cousin of fan-favorite Zazu from The Lion King, with <a href="https://www.earth.com/news/deforestation-threatens-two-new-fish-species-with-extinction/">extinction</a>.



Climate change is worsening extremes, such as high temperatures and the frequency and intensity of drought periods associated with arid regions. Animals that inhabit these regions are already suffering the consequences.&nbsp;



A team of researchers recently studied the breeding success of southern yellow-billed hornbills by investigating the impacts of high air temperatures and drought from 2008 to 2019. This study, published by <a href="https://www.frontiersin.org/">Frontiers</a>, is one of the first to examine how climate change impacts breeding success over a longer timescale.



“There is rapidly growing evidence for the negative effects of high temperatures on the behavior, physiology, breeding, and survival of various bird, mammal, and reptile species around the world,” said first author Dr. Nicholas Pattinson of the University of Cape Town.



“For example, heat-related mass die-off events over the period of a few days are increasingly being recorded, which no doubt pose a threat to population persistence and ecosystem function.”



The southern yellow-billed hornbill is found in most of southern Africa, largely within the Kalahari Desert. Known for its peculiar breeding and nesting strategy, the southern yellow-billed hornbill is a socially monogamous species.&nbsp;



The birds are cavity nesters; the female seals herself into the nest cavity and stays there for 50 days to care for chicks. They are protected by a narrow slit, which is only used by the males, who enter to feed the females and their chicks. This strategy protects the young hornbills from predators.&nbsp;



Breeding success depends on factors such as climate and food availability. The yellow-billed hornbills initiate breeding in response to rainfall, which corresponds with the hottest days of the year.&nbsp;



The research team studied pairs breeding in wooden nest boxes, and looked at breeding success at broad and fine scales (long term trends and individual breeding attempts). Climate trends within the region were also analyzed.&nbsp;



The study found a collapse in breeding during the monitoring period (2008-2019) due to an increase in the maximum air temperature. This was because high temperatures resulted in deadly impacts, such as reduced foraging, which affected the chances of successful breeding.&nbsp;



During the last three seasons (2016 to 2019), the experts found a decline in occupied nest boxes, dropping from 53 to 12 percent. Nest success - where pairs successfully raised at least one chick - also declined from 58 to 17 percent. Furthermore, the average number of chicks produced per breeding attempt decreased.&nbsp;



When the threshold air temperature reached above 35.7°C, no successful breeding attempts were recorded. The study revealed that breeding was negatively correlated with increased periods of heat - when the maximum air temperature exceeded the threshold that the hornbills could maintain normal breeding and nesting behavior. These effects were seen even in non-drought years.&nbsp;



The climate crisis is accelerating at a much faster pace, resulting in severe negative effects for species over alarmingly short time periods. The researchers predict that the southern yellow-billed hornbills could be wiped out as soon as 2027. The consequences of increased warming could drive local extinctions, where no young animals will replace the dying population.&nbsp;



“Much of the public perception of the effects of the climate crisis is related to scenarios calculated for 2050 and beyond,” said Dr. Pattinson. “Yet the effects of the climate crisis are current and can manifest not just within our lifetime, but even over a single decade.”



The study was published in <a href="https://www.frontiersin.org/journals/ecology-and-evolution">Frontiers in Ecology and Evolution</a>.



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By <a href="mailto:katherinebucko@gmail.com">Katherine Bucko</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Cousins of beloved Lion King character are vanishing as temperatures rise

The climate crisis is threatening the yellow-billed hornbill, a cousin...

In a new study from the <a href="https://umich.edu/">University of Michigan</a>, experts have investigated how the development of roads and railways may affect tiger populations. The findings can be used to help to assist <a href="https://www.earth.com/news/wildlife-conservation-can-help-stabilize-the-climate/">conservation</a> efforts and may ultimately help to save endangered tigers, such as those in Nepal.



"The rapid development of transport infrastructure is a major threat to endangered species worldwide. Roads and railways can increase animal mortality, fragment habitats, and exacerbate other threats to biodiversity," wrote the study authors.



"Predictive models that forecast the future impacts to endangered species can guide land-use planning in ways that proactively reduce the negative effects of transport infrastructure. Agent-based models are well suited for predictive scenario testing, yet their application to endangered species conservation is rare."&nbsp;



"Here, we developed a spatially explicit, agent-based model to forecast the effects of transport infrastructure on an isolated tiger (Panthera tigris) population in Nepal’s Chitwan National Park - a global biodiversity hotspot."



The researchers used the model to analyze what would happen to tigers in the future with the looming threats of transport infrastructure, including death or reduced prey availability.



“We found that roads and railways would dramatically increase tiger mortality, as tigers would frequently encounter vehicles and trains while patrolling their territories,” said study lead author Professor Neil Carter. “On average, in our model, tiger deaths along the roads and railways would reduce the tiger population from around 130 animals to just 50 animals over a 20-year period.”



Professor Carter noted that results are alarming and that these reductions would jeopardize the future of tigers in the region.



Based on their findings, the researchers urge land managers, developers, and researchers to utilize Smart Green Infrastructure planning to minimize impacts on tigers and their prey. This type of planning involves strategies such as realigning roads and railways to avoid critical habitats and reducing traffic volumes and speeds, according to the experts.



“There is still much to be learned about the effects of roads and railways on tiger behaviors and populations, but we think using models like ours can help promote tiger-friendly conservation development," said Professor Carter.



The study is published in the journal <a href="https://peerj.com/">PeerJ</a>.



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Tigers are threatened by road and railway development

In a new study from the University of Michigan, experts...

Monitoring marine biodiversity and ocean health usually involves teams of scientists that collect samples of seawater while traveling around on board a research vessel. This is a time-consuming and costly activity that can really only survey small areas and involves considerable laboratory work once back on shore to identify all the organisms present in each sample.&nbsp;



In a groundbreaking new step, researchers from the <a href="https://www.mbari.org/">Monterey Bay Aquarium Research Institute</a> (MBARI) have now used autonomous underwater robots to sample DNA from marine environments. They combined two novel autonomous platforms, both developed by MBARI, in order to sample and analyse environmental DNA (eDNA) in ocean locations.&nbsp;



The long-range autonomous underwater vehicle (LRAUV) is a nimble, streamlined robot that can travel to remote areas of the ocean and remain submerged for long periods of time. The Environmental Sample Processor (ESP) is a robotic “laboratory-in-a-can” that filters seawater and extracts the eDNA for future analysis. By equipping an LRAUV with ESP technology, researchers can expand the scale of ocean monitoring enormously over time and space.&nbsp;



“We know that eDNA is an incredibly powerful tool for studying ocean communities, but we’ve been limited by what we can accomplish using crewed research vessels. Now, autonomous technology is helping us make better use of our time and resources to study new parts of the ocean,” said study lead author Kobun Truelove, a biological oceanographer at MBARI.



Organisms that inhabit marine environments, from the smallest plankton to the largest whales, form communities that are connected by food webs. The biodiversity of these organisms is a measure of ocean health and it is important that scientists know which organisms are present in which localities. Autonomous tools like the LRAUV and ESP enable MBARI researchers to maintain a persistent presence in the ocean and monitor changes in sensitive ecosystems in ways that were not possible previously.



“Organisms move as conditions change in our oceans and Great Lakes, affecting the people and economies that rely on those species. We need cheaper and more nimble approaches to monitor biodiversity on a large scale. This study provides the synergistic development of eDNA and uncrewed technologies we need, in direct response to priorities laid out in the&nbsp;<a href="https://sciencecouncil.noaa.gov/Portals/0/Omics%20Strategic%20Plan_Final%20Signed.pdf?ver=2021-01-19-112404-443">NOAA ‘Omics Strategic Plan</a>,” explained study co-author and NOAA scientist Kelly Goodwin.



In the current research, MBARI collaborated with researchers at the NOAA Atlantic Oceanographic and Meteorological Laboratory and the University of Washington to complete three expeditions in the Monterey Bay National Marine Sanctuary. The teams carried out sample collection via MBARI’s fleet of LRAUVs as well as conducting traditional, ship based sampling using MBARI’s three research vessels and the NOAA Fisheries ship&nbsp;Reuben Lasker. The purpose of this multi-pronged approach was to find out whether the two different sampling procedures produced comparable results in terms of the marine organisms present in the different water samples.&nbsp;



The ship-based researchers lowered bottles to a specific depth to collect and preserve water samples, while LRAUVs equipped with ESP technology autonomously sampled and preserved eDNA at similar locations and depths. The eDNA samples were returned to the lab for in-depth sequencing.



Environmental DNA allows scientists to detect the presence of aquatic species from the tiny bits of genetic material they leave behind. This DNA soup offers clues about biodiversity changes in sensitive areas, the presence of rare or endangered species, and the spread of invasive species – all of which is critical to understanding, promoting, and maintaining a healthy ocean.&nbsp;



In this study, researchers analyzed eDNA samples with a technique known as metabarcoding. This method looks for short sections of DNA, known as gene markers, which are shared by related organisms. In this way the researchers can get an idea of the groups of organisms that are present in the water at each location. This technique enables eDNA data to be interpreted as a measure of biodiversity.&nbsp;



The researchers analyzed four different types of gene markers, each representing a slightly different level of the food web. Together, the results yielded a more holistic picture of community composition. The samples collected from research ships and autonomous vehicles revealed similar patterns of biodiversity, which supports the future use of autonomous vehicles for marine sampling and monitoring.



LRAUVs are able to travel for weeks at a time and for hundreds of kilometers underwater. They allow more frequent sampling in areas of interest than do traditional research vessels. Autonomous robots will allow researchers to study previously unsurveyed regions of the ocean and fill in gaps in knowledge about global ocean health. Ship-based research will continue to play an important role in oceanographic studies, but adding new autonomous technology to the toolkit will expand capacity for research, monitoring, and resource management. Ultimately, MBARI researchers envision deploying a fleet of LRAUVs equipped with ESP technology.



Truelove noted that the findings from the study mark an exciting step forward for monitoring marine ecosystems. “This work is all about increasing the scale of eDNA research. Instead of looking at an individual species, we can start to more broadly characterize biological community structure in the ocean,” he said.&nbsp;



“Good data are the bedrock of sustainable ocean management,” said Francisco Chavez, MBARI Senior Scientist and a co-author of the study. “Regular environmental DNA monitoring tells us who is there and what is changing over time. When it comes to understanding the impacts of climate change – one of the biggest threats to ocean health – this information is essential.”



The research is published today in the journal <a href="https://onlinelibrary.wiley.com/doi/10.1002/edn3.299">Environmental DNA</a>.



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Autonomous vehicles will help monitor ocean health

Monitoring marine biodiversity and ocean health usually involves teams of...

A recent study published in <a href="https://www.springer.com/journal/401">Acta Neuropathologica</a> has found evidence that some headbutting animals suffer traumatic brain injuries (TBI). This evidence suggests that experts can study the <a href="https://www.earth.com/news/blueberries-may-protect-our-brains-against-dementia/">brains</a> of these animals to help understand and treat human brain injuries.&nbsp;&nbsp;



Scientists at the <a href="https://icahn.mssm.edu/">Icahn School of Medicine</a> at Mount Sinai studied headbutting animals because they are known to engage in head-on head collisions for reproductive access and high social ranking. Furthermore, these animals’ brains are more relevant to study than previously studied rodent brains, said the researchers.



“One of the difficulties of TBI research is that most of it is performed on smooth, rodent brains. We thought that studying the brains of ramming bovids might provide a better model for understanding TBI in humans," explained study senior author Dr. Patrick R. Hof.



The study had a small sample size that included three musk oxen, four bighorn sheep, and one bison. The researchers analyzed the brains of the animals by scanning them and then treating slices of the brains with antibodies that allow doctors to detect TBI in humans.&nbsp;



Although the brains looked normal and scans revealed no damage, the experts detected damage in the bighorn sheep and musk oxen once they exposed the brain slices to antibodies and put them under microscopes.



"The fact that we detected these antibodies was important. It suggested that the brains of these animals, especially the muskoxen, sustain TBI-like damage," said study lead author Dr. Nicole Ackermans.&nbsp;



“This pattern is sometimes seen in the brains of people who suffer from CTE. Our results open the possibility that these animal’s brains undergo chronic, repetitive damage, as seen in some TBI patients.”



Interestingly, one of the sample brains belonged to an old female muskox. Her brain showed 20 times more damage than an older male and five times more damage than another female, and the experts are not sure why.



Despite the small sample size and unexpected results, the researchers are keen to continue exploring how headbutting bovines can be used to expand treatments for traumatic brain injuries.&nbsp;



“Death and disability caused by traumatic brain injury is a widespread problem that needs better solutions,” said Dr. Ackermans.



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By <a href="mailto:nire518@gmail.com">Erin Moody </a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Headbutting animals can suffer from traumatic brain injuries

A recent study published in Acta Neuropathologica has found evidence...

Trichodrilus longipenis

Taxonomic tree: