Toxoplasmosis transmitted through cat feces is threatening the endangered Hawaiian monk seal population. The Hawai’i News Now article, published on October 17th, 2016, stated that from 2001 to 2016, 8 Hawaiian monk seals have died as a result of toxoplasmosis. Felines are the only species in which toxoplasma can reproduce. Therefore, the cat population on Oahu poses a great threat to the health of the Hawaiian monk seal. Some conservationist advocate euthanizing feral cats to protect Hawaii's sensitive ecosystem. However, this has caused a heated debate on whether it is ethical to euthanize one species to protect another. The article seemed to imply that the parasite naturally occurs within the feline population. The article does not mention …show more content…
Since the feline species are the only recognized host of T. gondii, the parasite must pass through the feline digestive system in order to complete its life cycle and reproduce (NOAA, 2013). The parasite multiplies within the feline digestive tract, releasing the parasitic eggs through the cat’s feces (NOAA, 2013). The parasitic eggs infect other non-feline species, including mice and birds, which is a common source of transmission to uninfected cats (NOAA, 2013). Rainfall can wash the cat feces into the ocean where the parasitic eggs remain viable for up to two years (NOAA, …show more content…
The coastal and nearshore habitat of the Hawaiian monk seal is where most runoff water concentrates; thus, increasing exposure of T.gondii eggs to the Hawaiian monk seal (NOAA, 2013). The parasite is transmitted to the Hawaiian monk seal through either direct ingestion of toxoplasma eggs from the water or from consuming toxoplasma infected marine prey (NOAA, 2013). Toxoplasmosis can cause inflammation and dysfunction of the heart, liver, brain, and immune system; thus, increasing the vulnerability of the Hawaiian monk seal to other environmental threats (NOAA, 2013).
The impact of toxoplasmosis has resulted in the endangerment of the California sea otter and the extinction of alala, the Hawaiian crow. With only 1300 Hawaiian monk seals in existence, toxoplasmosis can potentially lead to their extinction. The extinction of the Hawaiian monk seal can produce devastating effects on the species that rely on the Hawaiian monk seal for food, such as the Tiger shark and Galapagos shark (NOAA, 2016). Meanwhile, the fish, crustacean, and cephalopod population may increase due to the reduction in predators. Therefore, the extinction of a species can disrupt Hawaii’s sensitive
Toxoplasma gondii is a single celled protozoan that lives and breeds in the intestines of felines. These intestinal parasites are passed to other organisms through the cats’ feces. Typically, humans are infected when cleaning out their cats’ liter box but the parasite can also be introduced through undercooked meat.
Animal or zoophilic infections are usually periodic and restricted to the areas where the host animal is found. Microsporum canis, the cat and dog ringworm, is the commonest of the zoophilic infections worldwide and spread occurs directly from an infected animal and, probably, from contaminated furniture, floors and carpets in the home environment. I contrast, Anthropophilic dermatophytes are more common in the community. In some cases there is evidence to support the existence of localized epidemics of
The Phocidae family consists of 29 existing species of earless seal that have been left from the initial 40. Out of this moderately sized group, we will be looking at the Hawaiian monk seal, Southern elephant seal, and the Crabeater seal.
The Hawaiian Monk seal is a greatly endangered marine species. These adorable creatures are being used for human goods such as their skin, meat, and oils. Not only this, but predators like Sharks and poisoning have also killed off the breed. Today in 2017, only about 1,100-1,400 are fighting for their lives. Since these beautiful creature, live on a touristy island, it is common for humans to be one of the biggest threats. Humans can throw litter and plastic into the water just to watch these animals suffer. Their own kind have also been a rising cause of these animals decreasing population by the males killing the females in group attacking called “mobbing”. These creatures are supposed to live anywhere
Hawaii Turtle Tours takes you for a tour around the island of Oahu to see some pretty amazing things. However, most people don’t know about the trouble that the islands face. The islands are home to some amazing and unique plants and animals. Yet, today it is estimated that there approximately 90% of these species are invasive or foreign. Leaving only 10% of native and endemic species left on the island. This means that of this small percentage, these plans and animals are found nowhere else in the world. Plus, the majority of these species are endemic, which means that they are found only in Hawaii and nowhere else.
The population decline in monk seals is due to several different factors with the biggest reason due to the low pup and juvenile survival rates (Curtice et al, 2011). At the Kure Atoll on the Northwestern Hawaiian Islands, 32 pups were observed in 1964 and 30 pups were observed in 1965. Of these pups born, all but one died or disappeared within 60 days after birth. This was also seen in the 1970’s at Green Island and Kure Atoll, where a mean population of 17 and 14 seals, respectively, was counted on these beaches, with a birth total of 10 showing a population decline of 70% (Gilmartin et al, 2011). The juvenile survival rate is still seen today with one in five monk seals surviving to the reproductive age, with one year old seals having the highest mortality rates (Norris et al, 2011).
The Kaho’Olawe island restoration project is a one of the smallest Hawai’ian Islands located near Maui. The Island is the largest unpopulated offering an opportunity to protect the Hawai’ian species and culture. Kaho’Olawe Island historically support many Hawaii’s native plant and animals yet invasive species present on the island have destroyed native plants and animal’s populations and disruptive of other practices. ISLAND CONSERVATION (IC) is working with the Kaho’Olawe Island Reserve Commission ( KIRC ) to advance the restoration of the islands by the removing of invasive species such as rodents and feral Cats. This effort of removal of these invasive species will allow for the protection of native habitats and providing the opportunity
I saw a few solitary animals frequent the quiet beach near my house. The protection of the friendly looking Hawaiian monk seal has not been without controversy. As recently as December of last year, a female pup was bludgeoned to death by an unknown person on the island of Kauai (Brenton). Unfortunately, this kind of occurrence (though highly illegal) is not uncommon in the Main Hawaiian Islands (MHI). These attacks can very detrimental the already small MHI population of approximately 200 individuals (NOAA). Why are monk seals so reviled by a few in Hawaii? What can be done to ease the human-wildlife conflict, and better protect this critically endangered
The leopard seal is one of six species of seals in the Antarctic. They can get up to 1230 pounds and fall anywhere between eight and twelve feet long. These large muscular animals have dark grey backs, and spots scattered among their light grey stomachs and throat. They get their name, “leopard seal”, from their impressively long sharp carnivore like teeth. Although their front teeth are sharp, their back teeth lock together to help them catch krill. Their appetite mainly consists of penguins, fish, squid, and krill, though they will prey on other seals. Although the leopard seal is considered the most ferocious seal in Antarctica, they will play with the penguins in a friendly manner. When they are not playing with the penguin they will grab
That’s exactly what the seal hunt in Canada is; Inhumane. The seal hunt in Canada kills thousands of seals annually every year. Pups are killed at about two weeks of age or three months of age. Seals are supposedly killed for their fur, oil, and meat. Seal hunting should be stopped in Canada because of the harm towards the seals.
The problem with plastic ending up in the ocean is that marine life is being harmed by the presence of it. A study done on the harbor seals in the Netherlands found that more than 12% had plastic in the digestive system (California Coastal Commission). The list of affected species indicates that marine debris is affecting a significant number of species. It affects at least 267 species worldwide, including 86% of all sea turtle species, 44% of all seabird species, and 43% of all marine mammal species (Save our shores). The problem is underestimated because the marine life that ingests plastic or dies from entanglement often goes undiscovered due to the vastness of the ocean, as they either sink or are eaten by predators before they are discovered (Plastic Debris). The potential harm from ingestion of plastics is not restricted to seabirds. Plastic bags drifting on ocean currents resemble the prey of turtles. There is evidence that their survival is being hindered by plastic debris with young sea turtles being vulnerable (Ocean pollution). Over the past 20 years polychlorinated biphenyls (PCBs) have polluted marine food webs at an increasing rate, and are prevalent in seabirds. Though their adverse effects may not always be apparent, PCBs lead to reproductive disorders, increase the risk of disease and alter hormone levels. These chemicals have a detrimental effect on marine organisms even at very low levels and plastic pellets could be a route for PCBs into marine food
The lifecycle of a heartworms begins when a female mosquito ingest blood containing microfilariae from a heartworm infected animal. Inside the body of the mosquito, the microfilariae develops into first stage larvae (L1) and then undergoes two more process to develop into third stage larvae (L3) of which is the infective stage. Depending on the temperature, this development process can take between eight and thirty days. At this point, when the infected mosquito attaches to a cat and feeds on its blood, the third-stage larva is transferred into the mosquito bite wound. Within three days of entering the cat, the L3 molt to the L4 stage in the tissues and muscles that lay just below the skin of the cat. After about two months of migrating through the muscles and tissues, the L4 undergoes a final development into immature adult heartworms. Seventy to ninety days post infection, the immature adult heartworms then enter a peripheral vein and are carried by the cat’s blood circulation system to the caudal pulmonary arteries. This is where the majority of heartworms are cleared from the cat due to a mass immune response, but a few may continue development into adults. Once the heartworm develop into adults, they invade the heart first and then spread to other organs in the body and cause
One of the most commonly shared beliefs about aquaculture is that it has potential to amplify and transfer disease/parasites to wild fish populations, but strict management practices and guidelines have been utilized and supplemented to ensure that US farming operations mitigate current and potential environmental risks associated with aquaculture (NOAA, 2015). Among these practices are regular diver-led inspections to investigate the integrity of nets and net infrastructure, surveillance cameras and even public webcam feeds that monitor the fish farms and in particular monitor efficient use of feed, regular health inspections in efforts to have a head start on disease prevention and detection, and “comprehensive sanitary and biosecurity programs to prevent the introduction and/or spread of pests or diseases from one farm site/cage to another or into the environment.” (NOAA, 2015). Additionally, movements are being made to stop the spreading of disease and to limit oceanic pollution by containing salmon in solid tanks rather than in netting. “In Washington State, Domsea Farms has launched a land-based, freshwater system to produce coho salmon.” (David Suzuki Foundation, n.d.) This method is not only environmentally sound, but it opens up aquacultural boundaries. By containing fish in these large tanks, there is potential for salmon aquaculture to
Transmission of the parasite can occur in several different ways. Direct transmission can occur by handling infected animal or human feces. One quarter of reported direct transmission infections occurred by direct contact with feces, while the rest were reported to have happened by person to person contact (Donnelly & Stentiford, 1997).
How the disease was transmitted was further looked on by Nelson (1995). According to the said author, the disease was transmitted primarily by fleas and rats. The stomachs of the fleas were infected with bacteria known Y. Pestis. Nelson held that “the bacteria would block the "throat" of infected fleas so that no blood could reach their stomachs, and they grew ravenous since they were starving to death” (1995, par. 14). The bacteria would then attempt to suck up blood from their victims, only to disgorge it back into their preys' bloodstreams (Nelson, 1995). Now, however, the victims' blood was mixed with Y. Pestis. Fleas infected rats in this fashion, and the rats spread the disease to other rats and fleas before dying (Nelson, 1995). Without rodent hosts, the fleas then migrated to the bodies of humans and infected them in the same fashion as they had the rats .