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Hawaiian Monk Seal

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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

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