//
you're reading...

Human impacts

Are marine mammals susceptible to COVID-19?

S. Mathavarajah, A.K. Stoddart, G.A. Gagnon, et al., Pandemic danger to the deep: The risk of marine mammals contracting SARS-CoV-2 from wastewater, Science of the Total Environment https://doi.org/10.1016/j.scitotenv.2020.143346

Two images are shown side by side. On the left are two bottlenose dolphins with their heads sticking out of bright blue water and their mouths slightly open. On the right the virus is shown against a black background. It is gray with red spikes all over.

On the left are two bottlenose dolphins, a common marine mammal, and on the right is an example image of SARS-CoV-2, the novel coronavirus which causes COVID-19. As the virus spreads, its potential impact on wildlife has become a concern. (Image sources: Pxhere and Pixabay)

 

Humans aren’t the only ones at risk of contracting the novel coronavirus (SARS-CoV-2), which causes the COVID-19 disease. It turns out there are a number of other species, particularly other mammals, which are likely susceptible to the virus. Coronaviruses are zoonotic, which means that they can spread between different animals, including humans. You may have heard something about how SARS-CoV-2 could have originally spread to humans from bats or pangolins. Although it is still unclear exactly where and how SARS-CoV-2 originated, it most likely was spread from another animal. 

High cliffs are behind a large whale splashing as it leaps out of the water. The whale is dark in color, is bulky, has rectangular flippers, no dorsal fin, and rough callosities on its face.

The North Pacific right whale is one of the species which is both endangered and highly susceptible to SARS-CoV-2. A Southern right whale, which is a close relative of the North Pacific right whale, is shown here jumping out of the water. (Image source: Pixabay)

Since it spread from another animal to humans, one of the questions researchers have been asking is how susceptible other species might be to SARS-CoV-2 spreading from humans (a process which has been termed “reverse zoonosis”). Evidence of pet cats and even tigers at a zoo acquiring SARS-CoV-2 has led to further questions about how the virus might spread across species, which is particularly important to consider for endangered species.

Recent studies have shown that marine mammals, many of which are already listed as threatened or endangered, are likely susceptible to SARS-CoV-2 and that the virus could be spread through wastewater, which is often transported untreated or insufficiently treated to coastal marine ecosystems.

Which marine mammal species might contract SARS-CoV-2?

To assess susceptibility in different species, researchers have looked at ACE2, an enzyme that is targeted by the novel coronavirus. Coronaviruses are named for the corona, or crown, formed by the spikes on the outside of the virus, and this structure is what helps the virus bind to ACE2. Studies of the gene that codes for ACE2 can look at differences across species and determine how well SARS-CoV-2 is likely to stick to this enzyme. The ACE2 gene in other animals can also be compared to the human gene to assess relative susceptibility.

In a recent study in the journal Science of the Total Environment, researchers used published marine mammal genomes to determine susceptibility to the novel coronavirus. Although their

A sea otter lies on it's back at the water's surface with its feet in the air and hands on it's chest, head facing the camera.

Northern sea otters are another species which is both endangered and highly susceptible to SARS-CoV-2. (Image source: Pixabay)

results varied across species, they found high risk levels overall, which is not surprising since scientists have observed marine mammals infected by other coronaviruses in the past.

Of the species they could obtain genomes from, the research team found high risk for 18 of 21 whale and dolphin species, 8 of 9 seal species, as well as for sea otters. For a number of these species, including orcas, sperm whales, humpback whales, walruses, and sea otters, susceptibility to SARS-CoV-2 is likely to be even higher than it is for humans.

Danger for already at-risk species

After determining the relative susceptibility to the virus, the authors of this paper next mapped the conservation status of the marine mammals in their study alongside each species’ relative SARS-CoV-2 susceptibility. Fifteen of the susceptible marine mammal species from this study are found on the IUCN Red List. Species like the vaquita porpoise, which is critically endangered and on the brink of extinction, and the endangered North Pacific right whale are also highly susceptible to SARS-CoV-2. 

The top of a beluga whale's white head sticks out above the surface of the water.

Beluga whales, like the one shown here, can be found around Alaska, and they are also susceptible to SARS-CoV-2. (Image source: Pixabay)

In addition to their conservation status, marine mammals are particularly at risk because there are so many coastal species which live in close proximity to human activity. SARS-CoV-2 is known to be shed in wastewater, and often this wastewater ends up in the ocean. If the wastewater is not thoroughly treated, the virus is likely to still be present and could infect local wildlife. This study in particular used Alaska as a case study to investigate the overlap between marine mammal distribution along the coasts and wastewater treatment plant locations. Alaska is home to a variety of marine mammal species, but also has a number of coastal wastewater treatment plants, not all of which treat sewage sufficiently to eliminate viruses. The authors suggested that better wastewater treatment is implemented in these locations in Alaska, as well as other locations which may have a similar overlap in marine mammal distribution and sewage treatment plants.

Look to SnotBots, vaccines, and modeling for solutions

A light gray harbor seal lies on its side facing the camera on a sandy beach.

Harbor seals, like the one shown here, are common coastal species, making virus transmission via wastewater a concern. (Image source: Pixabay)

So what can we do to make sure wastewater doesn’t infect already at-risk marine mammal species? The authors of this recent study suggest a few approaches for future monitoring and research to do just that. For example, they suggest using technology like SnotBot drones, which can fly over whales and collect some of their snot when they come to the surface to breathe. These snot samples are then analyzed and, in the case of coronavirus, could be used to monitor virus presence or spread. The authors also suggest that more modeling needs to be done, particularly with actual animal cells, to verify the relative susceptibility levels estimated in this paper. Future research along these lines would help to outline risk levels more precisely and promote other solutions.

Finally, just like the excitement around vaccine development to reduce human risk of contracting SARS-CoV-2, it’s possible we might be able to vaccinate marine mammals in the future if it becomes clear that the virus has spread to them. The idea of vaccinating marine mammals is not a new one; in fact, wild Hawaiian monk seals (which are endangered and, according to this paper, also susceptible to SARS-CoV-2) have been vaccinated against a different virus in the past.

There’s a lot we still don’t know about the novel coronavirus—both about ourselves and other species. Scientists are hard at work to keep us informed on the latest discoveries, and creative new research and technology has much to offer in the fight for health and safety for all species across the globe.

Discussion

No comments yet.

Post a Comment

Instagram

  • by oceanbites 3 hours ago
    Happy Earth Day! Take some time today to do something for the planet and appreciate the ocean, which covers 71% of the Earth’s surface.  #EarthDay   #OceanAppreciation   #Oceanbites   #CoastalVibes   #CoastalRI 
  • by oceanbites 4 weeks ago
    Not all outdoor science is fieldwork. Some of the best days in the lab can be setting up experiments, especially when you get to do it outdoors. It’s an exciting mix of problem solving, precision, preparation, and teamwork. Here is
  • by oceanbites 2 months ago
    Being on a research cruise is a unique experience with the open water, 12-hour working shifts, and close quarters, but there are some familiar practices too. Here Diana is filtering seawater to gather chlorophyll for analysis, the same process on
  • by oceanbites 3 months ago
    This week for  #WriterWednesday  on  #oceanbites  we are featuring Hannah Collins  @hannahh_irene  Hannah works with marine suspension feeding bivalves and microplastics, investigating whether ingesting microplastics causes changes to the gut microbial community or gut tissues. She hopes to keep working
  • by oceanbites 3 months ago
    Leveling up - did you know that crabs have a larval phase? These are both porcelain crabs, but the one on the right is the earlier stage. It’s massive spine makes it both difficult to eat and quite conspicuous in
  • by oceanbites 3 months ago
    This week for  #WriterWednesday  on  #Oceanbites  we are featuring Cierra Braga. Cierra works ultraviolet c (UVC) to discover how this light can be used to combat biofouling, or the growth of living things, on the hulls of ships. Here, you
  • by oceanbites 4 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Elena Gadoutsis  @haysailor  These photos feature her “favorite marine research so far: From surveying tropical coral reefs, photographing dolphins and whales, and growing my own algae to expose it to different
  • by oceanbites 4 months ago
    This week for  #WriterWednesday  on Oceanbites we are featuring Eliza Oldach. According to Ellie, “I study coastal communities, and try to understand the policies and decisions and interactions and adaptations that communities use to navigate an ever-changing world. Most of
  • by oceanbites 4 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Jiwoon Park with a little photographic help from Ryan Tabata at the University of Hawaii. When asked about her research, Jiwoon wrote “Just like we need vitamins and minerals to stay
  • by oceanbites 5 months ago
    This week for  #WriterWednesday  on  #Oceanbites  we are featuring  @riley_henning  According to Riley, ”I am interested in studying small things that make a big impact in the ocean. Right now for my master's research at the University of San Diego,
  • by oceanbites 5 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Gabby Stedman. Gabby is interested in interested in understanding how many species of small-bodied animals there are in the deep-sea and where they live so we can better protect them from
  • by oceanbites 5 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Shawn Wang! Shawn is “an oceanographer that studies ocean conditions of the past. I use everything from microfossils to complex computer models to understand how climate has changed in the past
  • by oceanbites 5 months ago
    Today we are highlighting some of our awesome new authors for  #WriterWednesday  Today we have Daniel Speer! He says, “I am driven to investigate the interface of biology, chemistry, and physics, asking questions about how organisms or biological systems respond
  • by oceanbites 6 months ago
    Here at Oceanbites we love long-term datasets. So much happens in the ocean that sometimes it can be hard to tell if a trend is a part of a natural cycle or actually an anomaly, but as we gather more
  • by oceanbites 7 months ago
    Have you ever seen a lobster molt? Because lobsters have exoskeletons, every time they grow they have to climb out of their old shell, leaving them soft and vulnerable for a few days until their new shell hardens. Young, small
  • by oceanbites 7 months ago
    A lot of zooplankton are translucent, making it much easier to hide from predators. This juvenile mantis shrimp was almost impossible to spot floating in the water, but under a dissecting scope it’s features really come into view. See the
  • by oceanbites 7 months ago
    This is a clump of Dead Man’s Fingers, scientific name Codium fragile. It’s native to the Pacific Ocean and is invasive where I found it on the east coast of the US. It’s a bit velvety, and the coolest thing
  • by oceanbites 8 months ago
    You’ve probably heard of jellyfish, but have you heard of salps? These gelatinous sea creatures band together to form long chains, but they can also fall apart and will wash up onshore like tiny gemstones that squish. Have you seen
  • by oceanbites 9 months ago
    Check out what’s happening on a cool summer research cruise! On the  #neslter  summer transect cruise, we deployed a tow sled called the In Situ Icthyoplankton Imaging System. This can take pictures of gelatinous zooplankton (like jellyfish) that would be
  • by oceanbites 9 months ago
    Did you know horseshoe crabs have more than just two eyes? In these juveniles you can see another set in the middle of the shell. Check out our website to learn about some awesome horseshoe crab research.  #oceanbites   #plankton   #horseshoecrabs 
WP2Social Auto Publish Powered By : XYZScripts.com