The effects of global warming & Speciation (SNAB)

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  • Created on: 18-03-13 21:49
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The Effects of Global Warming
Rising Temperatures
Changing rainfall patterns - some areas will get more rain, others will get less rain.
Changing seasonal cycles
These will directly affect animals and plants:
Changing distribution of species
Some species will cope better with climate change than others therefore causing the balance between species in a community to shift.
Some will become dominant where as some will be lost.
If organisms are mobile or have good seed dispersal they may migrate to more favourable conditions.
Some communities may experience an invasion by exotic or alien species which could push inhabitants out.
Pests and diseases may also spread to new area and act to reduce crop yields.
It is not only temperature that will affect species distribution ­ changing rainfall, soil moisture, winds and rising sea levels will influence
species and communities.
Altered development & lifecycles
Faster photosynthesis ­ faster growth: the rate of photosynthesis is determined by many limiting factors e.g. co2 concentration and
temperature. However, above an optimum temperature plant enzymes work more slowly. Also the rate of photosynthesis would not
increase indefinitely with rising co2, because other factors e.g. light intensity, water or nutrients would start to limit photosynthesis.
Animals are likely to be affected if temperature acts as an environmental trigger for their development or behaviour e.g. insects may get
through their lifecycle quicker and be ready to feed before the plants they feed on are mature.
The egg incubation temperature of some reptiles determines the sex of their offspring.

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PHENOLOGY is the study of seasonal events in the lives of species e.g. time of flowering, time of egg laying or migration. It has been
recognised that the timing of such events is a useful biological indicator of global climate change.
Investigating the Effect of Temperature on Organisms
SEEDLING GROWTH RATE
1. Plant some seedlings in soil trays and measure the height of each seedling.
2. Put the trays in incubators at different temperatures
3. Make sure all variable e.g.…read more

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Make sure all variables e.g. volume of water, salinity of water and oxygen concentration is kept constant.
3. Number of hatched brine shrimp in each water bath is recorded every 5 hours.…read more

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