Nature & Geography | The Canadian Encyclopedia

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    Pocket Mouse

    Pocket Mouse, small, jumping rodent of the North American family Heteromyidae.

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    Poison Ivy

    Poison ivy plants can spread by underground stems or seeds. Most are small shrubs (0.5-1 m tall); others are vinelike plants, 15 m or longer, supported by aerial roots. Shrubby forms are sometimes called poison oak.

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    Poisonous Plants

    Toxic PropertiesToxic reactions generally are caused by chemical compounds that are produced by plants or absorbed from soil. These compounds produce undesirable physiological responses in individuals or animals.

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    Polar Bear

    The polar bear (Ursus maritimus) is the largest living species of bear. They are found throughout the circumpolar Arctic. In Canada, this means polar bears live in parts of the Yukon, the Northwest Territories, Nunavut, Manitoba,Ontario, Quebec and Newfoundland and Labrador. Polar bears are both culturally and economically significant to the Inuit. As climate change continues to reduce their sea ice habitat, polar bears are increasingly threatened.

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    Pollution can be defined as the release of any material, energy or organism that may cause immediate or long-term harmful effects to the natural ENVIRONMENT. Pollution was viewed initially as the unsightly mess or visible environmental damage resulting from careless disposal of various materials.

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    Pollution Probe Foundation

    Pollution Probe was formed in 1969 by a group of University of Toronto students in an effort to address some of the environmental issues that were without a champion at the time. The organization became a registered charity in 1971.

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    Pondweed is a common name for members of the family Potamogetonaceae [Gk potamos, "river"], which consists of the genus Potamogeton.

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    The poplar is a short-lived, deciduous, hardwood tree of genus Populus of the willow family, widely distributed in the northern temperate zone.

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    Of the world's 23 species, only the North American porcupine (Erethizon dorsatum) occurs in Canada, throughout mainland forests and thickets.

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    Potash is an alkaline potassium compound most commonly used in fertilizers. It refers to a variety of salts produced through mining of minerals and chemical manufacturing. Canada is the world's largest potash producer and exporter.

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    The potato (Solanum tuberosum) is a herbaceous annual of the nightshade family, which produces tubers at the end of underground branches called stolons.

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    Potato Wart Disease

    Potato wart disease, also called potato canker, is a fungal disease of potato sprouts, eyes and stolons. The disease is caused by the soil-borne fungus, Synchytrium endobioticum. Potato wart disease poses no danger to human health or food safety, but it can impact local economies as the disease can reduce yield and effect economic regulations, such as potato exports. (See also Agricultural Economics.)

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    Prairie Crocus

    Crocus, Prairie, see ANEMONE.

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    Prairie Dog

    The prairie dog is a highly gregarious, diurnal, terrestrial ground squirrel that lives in colonies or "towns."

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    Prairie Farm Rehabilitation Administration (PFRA)

    The Prairie Farm Rehabilitation Administration (PFRA) was a branch of Agriculture and Agri-Food Canada with a focus on Western Canada. It was headquartered in Regina, Saskatchewan. The PFRA also had 22 district offices throughout the Prairie provinces. The agency began in response to the drought crisis of the 1930s in the Prairies. However, for nearly eight decades, it continued to help farmers conserve soil, prevent erosion, develop water resources and manage pasture land.

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