How is it that a parasite transmitted by cats on land can contribute to the death of sea otters in the ocean? The answer lies in a parasite called Toxoplasma gondii and the journey it takes from cats, through the environment, and then to wild marine mammals. Here you see Toxoplasma gondii's complex journey from prey species to cats to the sea or to humans or livestock. Oocysts are key ingredient in that transport. Toxoplasma gondii is a parasite that can infect virtually all warm-blooded animals, but the only known definitive hosts are cats — domesticated and feral house cats included.
Researchers study how to improve southern sea otter survival
Sea Otters - Term Paper
University of Oregon scientists are probing archaeological evidence for how indigenous peoples used sea otters, and their findings could help Alaskans confront growing numbers of the mammals and Oregonians who want to reintroduce them on the coast. Before fur traders decimated sea otter populations from Alaska to Oregon, ancestors of at least one Alaskan indigenous population, the Tlingit, hunted the mammals for their pelts but probably not for food, according to a study by anthropologist Madonna Moss. Her research, published in April in American Antiquity , took on questions about traditional use by native populations amid calls to expand harvesting. Since their reintroduction in the s, the population of sea otters has spiraled.
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Sea otters have the distinction of using tools, such as rocks, to break open hard-to-access food sources. In sea otters, however, we found no association between relatedness and mitochondrial haplotypes part of the DNA genome inherited from the mother with tool use. Instead, our work suggests a predisposition of all sea otters to use tools when faced with certain ecological conditions. Biology Letters is a broad-interest journal publishing short, highly innovative, cutting-edge research articles and opinion pieces across the biological sciences. Holly B.
To become a paid subscriber, begin the process by registering. Teaching notes are intended to help teachers select and adopt a case. They typically include a summary of the case, teaching objectives, information about the intended audience, details about how the case may be taught, and a list of references and resources. The following video s are recommended for use in association with this case study. Some Animals are More Equal than Others This short film opens with two questions: "So what determines how many species live in a given place?