Lecture 14.pptx - BIOL 3442F – 2019 Instructor Dr Junyan Zhang Habitat loss#1 cause of species extinctions/loss of biodiversity Habitat fragmentation

Lecture 14.pptx - BIOL 3442F – 2019 Instructor Dr Junyan...

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Instructor: Dr. Junyan Zhang BIOL 3442F – 2019
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2 Habitat loss #1 cause of species extinctions/loss of biodiversity Habitat fragmentation loss of habitat conversion of habitat into something else remnants of the poorest quality edge effects (quality degrades) the eternal external threat abiotic & biotic changes biodiversity implications
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Top: Before New York Bottom: New York, USA Hooke and Martín-Duque. 2012 3
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Temperate Broadleaf Forest Tropical Dry Forest Tropical Grasslands Tropical Coniferous Forest Mediterranean Forests Temperate Grasslands & Woodlands Tropical Moist Forest 100% 0 50 Percent of habitat (biome) remaining Habitat loss by biome – note losses by 1990! Source: Millennium Ecosystem Assessment Tropical forests contain: Already lost about 50% habitat Losing 2% per year 50% of the world’s biodiversity 6
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The way we were The way we are @ NASA
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Remember Britain where no natural habitat exists at all!! 8
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and our own backyard 9
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Habitat loss is extreme worldwide: our own backyard Over 400 species at risk in Canada Over 160 of them are in Ontario 1 0
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Conversion of original wetland area by County, c. 1800 –2002 Wetlands in southern Ontario reduced by 72% from pre- settlement to 2002. Loss most dramatic in SW Ontario and north of the lower Great Lakes, where over 85% of wetlands have been converted to other uses. (Ducks Unlimited The only ecosystem with international convention
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Near Newmarket, ON
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Convertin g natural habitats into domestic habitats
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Habitat fragmentation :
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