Omar Khalid
Jellyfish are simple invertebrates with a basic digestive system that acts as both a stomach and intestine. In 2016, scientists discovered plastic in the stomachs of jellyfish for the first time. This discovery has raised concerns about the impact of plastic pollution on marine life and its potential to be transferred along marine trophic webs. With jellyfish mistaking plastic for food, ingesting plastic can lead to health issues and impact the animals that consume them. This highlights the vulnerability of jellyfish to plastic pollution and the need for further studies to understand the extent of plastic's impact on this species.
| Characteristics | Values |
|---|---|
| Do jellyfish have plastic in their stomachs? | Yes, a study published in the journal Scientific Reports documented the first instance of plastic in a jellyfish's stomach. |
| When was plastic in jellyfish stomachs first discovered? | April 2016, by a group of scientists participating in the Aquatilis Expedition, a three-year research trip to explore the world's oceans. |
| Where was the discovery made? | Mediterranean Sea, around Ponza Island (Tyrrhenian Sea, Italy) |
| Which species of jellyfish was involved? | Mauve stinger (P. noctiluca) |
| How was the plastic ingested? | Plastic trash was trapped under their hoods or woven through their bodies, and they may have mistaken it for food. |
| What are the implications? | Ingesting too much plastic can cause animals to slowly starve, and as prey for larger animals, plastic-laden jellyfish could have dangerous health impacts on their predators. |
| How does plastic affect jellyfish populations? | The presence of plastics provides jellyfish with new surfaces to attach to during their "polyp" phase, allowing them to thrive in deeper water and outcompete other species for food. |
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What You'll Learn
How jellyfish interact with plastic
Jellyfish are simple creatures, lacking brains, blood, and hearts. They are composed of three layers: an epidermis outer layer, a thick elastic middle layer, and an inner layer called the gastrodermis. Jellyfish have a simple digestive cavity that acts as both the stomach and intestine, with one opening for the mouth and anus.
Jellyfish are highly opportunistic and adaptable, having survived every mass extinction in Earth's history. They are able to thrive in environments where other species cannot. For example, they are not affected by ocean pH imbalances in the same way that species with skeletal structures are. They are also able to outcompete other species for food in warmer waters.
Jellyfish are attracted to plastic in the ocean, which poses a threat to their health. In 2016, a group of scientists found plastic in the digestive system of jellyfish in the Mediterranean Sea. It is believed that the jellyfish mistook the plastic for food. The plastic may have been made more appealing by the algae that grow on it, which, as it breaks down, emits an odour called dimethyl sulfide that attracts hungry animals.
The presence of plastic in jellyfish also has implications for other species in the marine food web. As a prey species, plastic-laden jellyfish could have dangerous health impacts on the animals that consume them, including humans. Bluefin tuna, a common predator of the mauve stinger, is consumed by people and marine mammals. This means that the small microscopic pieces of plastic that jellyfish consume may end up in the bellies of larger species.
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Plastic in the jellyfish food chain
Jellyfish are one of the most opportunistic species on Earth, adapting to and thriving in environments and degraded ecosystems where other species cannot survive. They are simple creatures, lacking brains, blood, or hearts. Their simple digestive cavity acts as both their stomach and intestine, with one opening for the mouth and anus.
Jellyfish have been found to ingest plastic items, with the first documentation of this occurring in 2016. Scientists found plastic trash trapped under the hoods of mauve stingers or woven through their bodies. Upon closer inspection, four out of twenty jellyfish were found with plastic in their digestive systems, indicating that they had mistaken the plastic for food. This is a significant problem, as jellyfish are preyed on by larger animals, including humans, meaning that the plastic they consume may end up in the bellies of larger species.
The ability of jellyfish to internalize low-density macroplastic and other anthropogenic debris has raised concerns about the impact of marine litter on their common predators. It was previously thought that these predators only mistook floating plastics as prey. However, this new understanding of jellyfish as potential vectors of plastics along marine trophic webs highlights an understudied area of marine litter research.
Furthermore, the infiltration of man-made surfaces such as plastics into the seas has provided jellyfish with new materials to attach to during their "polyp" phase. As a result, jellyfish can now thrive in deeper water, no longer restricted to coastlines or enduring great depths to find a substrate. This has contributed to their ability to adapt and thrive in an environment increasingly filled with plastic.
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Plastic mistaken for food
Jellyfish are simple creatures that have survived every mass extinction in Earth's history. They have no brains, blood, or hearts. Instead, they have an elementary nervous system that allows them to detect light, smell, and respond to other stimuli, including food or danger. Jellyfish have a simple digestive cavity that acts as both their stomach and intestine, with one opening for the mouth and anus.
Jellyfish are highly opportunistic and adaptable, and they have thrived in environments and degraded ecosystems where other species cannot survive. Their ability to adapt to changing conditions, such as rising temperatures and increasing acidification, has contributed to their success. Unfortunately, this adaptability has also led to them consuming plastic pollution in the oceans.
In 2016, during the "Aquatilis Expedition" on Ponza Island in the Mediterranean Sea, scientists discovered the first documented evidence of plastic in the digestive system of jellyfish. Specifically, they found that mauve stingers (P. noctiluca) had various types of plastic trash trapped under their hoods or woven through their bodies. This discovery highlighted the vulnerability of medusae to plastic pollution in the water, which can be transported through ocean currents.
It is believed that jellyfish mistake plastic for food. This may be because the plastic resembles their prey or because, as it breaks down, it emits an odor called dimethyl sulfide that attracts hungry animals. Ingesting plastic can cause health issues for jellyfish, as it can lead to slow starvation. As prey for larger animals, including humans, jellyfish with plastic in their systems can also impact the health of other species in the food chain.
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Plastic in the jellyfish digestive system
Jellyfish are simple invertebrates with a basic nervous system that allows them to smell, detect light, and respond to stimuli. Their digestive system is equally simple, with a single cavity that serves as both the stomach and intestine, with one opening for the mouth and anus. Jellyfish are highly opportunistic and adaptable, having survived every mass extinction in Earth's history. This adaptability, combined with their simple digestive system, makes them vulnerable to ingesting plastic pollution in the oceans.
In 2016, scientists with the Aquatilis Expedition discovered the first documented evidence of plastic in the digestive system of jellyfish. They found that multiple mauve stingers (P. noctiluca) had various types of plastic trash trapped under their hoods or woven through their bodies. Further investigation revealed that four out of twenty stingers contained plastic in their digestive systems, indicating that the jellyfish had mistaken the plastic for food.
The presence of plastic in the digestive systems of jellyfish has significant implications for the marine ecosystem. As jellyfish are prey for larger animals, such as Bluefin tuna, the plastic they consume can end up in the bellies of these larger species, including humans. This transfer of plastic along the marine food chain, known as trophic transference, raises concerns about the impact of plastic pollution on marine wildlife and human health.
While the exact reason why jellyfish are attracted to plastic is not fully understood, scientists have proposed several theories. One theory suggests that algae growing on ocean plastic emit an odor called dimethyl sulfide that attracts hungry animals. Another theory posits that a biofilm coating the plastic or certain molecules released during the breakdown of plastic may be attractive to jellyfish. Further experiments are needed to confirm these hypotheses and understand the full extent of plastic ingestion by jellyfish.
Additionally, the presence of plastic in the ocean has indirectly contributed to the proliferation of jellyfish populations. Jellyfish, in their early polyp phase, typically attach themselves to surfaces on the ocean floor. However, with the influx of plastic pollution, jellyfish now have more surfaces to attach to, allowing them to thrive in deeper waters and expand their range. This expansion has led to higher temperatures and increasing acidification, creating an environment that favors jellyfish over other species.
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Plastic providing a surface for jellyfish to attach to
While there is evidence of plastic in jellyfish's digestive systems, it is unclear whether jellyfish attach themselves to plastic surfaces. However, it is known that jellyfish need solid surfaces to settle upon during their polyp stage. They are more likely to attach to man-made structures made of wood, brick, and concrete than sand. This provides a better habitat for jellyfish to reproduce and complete their life cycles.
Stalked jellyfish, such as the staurozoans, are attached to rocks or seaweed by a basal disk. They do not float through the water like other jellyfish but remain anchored to a solid surface. The polyps of jellyfish may be sessile, living on the bottom of boat hulls or other substrates, or they may be free-floating or attached to tiny bits of free-living plankton or, rarely, fish or other invertebrates.
The presence of plastic in the oceans is a significant environmental concern, and jellyfish may play a role in addressing this issue. Jellyfish blooms can cause problems for swimmers, power plants, and fisheries, but they may also have a positive impact by creating currents around their bodies that trap objects, including nutrients and waste particles, as they swim. This natural ability to trap objects has inspired the development of the Jellyfish-Bot, a robotic trash collector designed to efficiently collect and remove plastic waste from the oceans without harming marine ecosystems and wildlife.
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Frequently asked questions
Yes, in 2016, a study published in the journal Scientific Reports documented the first instance of plastic in a jellyfish's stomach. The jellyfish was found in the Mediterranean Ocean by scientists on the Aquatilis Expedition.
It is believed that jellyfish mistake plastic for food. Plastic debris in the ocean can be coated with a thin layer of biofilm or some molecule that attracts jellyfish.
Ingesting plastic has been shown to cause animals to slowly starve. As jellyfish are preyed on by larger animals, the plastic they ingest can end up in the bellies of these larger species, including humans.
