In addition to habitat loss, structures such as dams, roads and railways serve to divide freshwater ecosystems, impede migration of fish and other species, and alter the flow of nutrients. The negative results includes a loss of genetic diversity in aquatic species. A total of 61 subwatersheds, mostly in southern Canada where roads are most numerous, show a very high loss of connectedness.
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In the North, logging and mining roads are the primary causes of fragmentation. A growing influx of invasive plants and animals has reduced biodiversity and changed the balance of ecological communities in a number of subwatersheds, most notably in Southwestern Ontario where native species are already under high stress due to other risk factors. This threat was among the more challenging of the seven to measure because it is easier to demonstrate the presence rather than the absence of a species that is not native.
The threat level only indicates invasive species that are already known to be present in a given watershed, not those that pose likely future threats, such as Asian Carp in the Great Lakes. While climate change currently presents a low or moderate risk across most of Canada today, it is the stressor that is most likely to play a major role in watershed health in the future. Climate projections include more frequent extreme weather events such as flooding and severe droughts that will further tax water systems.
More broadly, even small shifts in temperature and precipitation can translate into profound effects on flow rates and on the way ecosystems function. In terms of watershed health, climate change is expected to become important as an amplifier of other threats. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way.
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Article text size A. To view your reading history, you must be logged in. Log in Register. Ivan Semeniuk Science Reporter. Published June 11, Updated November 12, Story continues below advertisement. Unsafe to drink: Water treatments fail on Canadian reserves, Globe review finds For every water-treatment system the government fixes, plenty remain in a shambolic state, Matthew McClearn explains.
Climate change stole a Yukon river almost overnight, scientists say. Anatomy of a deluge: Were the Quebec floods a sign of things to come? The spring flooding in Quebec had experts pondering what the record-breaking event portends for the region — and the rest of Canada — as weather extremes increasingly become the norm.
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At Breakwater, rentals for a studio range from R7 to R10 , a one-bed fetches between R9 and R20 , and a two-bed from R18 to R32 At Ports Edge, rentals range from R7 for a studio, tenants pay R10 to R15 for a one-bed, and R27 for a two-bed.
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This compares to a average of R7. Historically, sectional title average prices there is no freehold peaked at R7. Prices have since accelerated sharply. In terms of units sold, there were 54 sales in , decreasing to a low of 15 sales in Sales rebounded strongly in to 41, stabilising at 36 sales in and about 35 sales last year. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Its rich history is interwoven into a phenomenally successful commercial, retail, residential and tourist destination. Next I want to invest in… Canada.
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