#4 - Plants - 1st 10-point lecture quiz The authors of our...

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1 1 st 10-point lecture quiz The authors of our first outside reading noted that for many years fishery scientists assumed that harvesting fish from a population was essentially like mowing a lawn. Explain what this means, and indicate specifically why this view is now outdated. It all starts with plants At the heart of Ecology is the collection of energy and minerals by green plants (and a smattering of other energy-fixing creatures) to produce organic compounds ... and the subsequent use of these compounds by a hierarchical web of consumer organisms Light – a variable resource The photosynthetic parts of plants live in a highly varying light regime – varying intensities across the planet and across physical environments – varying wavelengths (color = energy) – seasonality – weather (amount of light blocked in the atmosphere) – nearby plants Solar radiation does not fall evenly across the earth
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2 Annual variations overlain on latitude Micro-effects Plants often live with many other plant species of varying types Figure 3.10, showing the canopy fullness for four kinds of Australian trees across a year. Note that the dry season (winter) is April to November.
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3 If you refer back to the previous slide, you should remember that not only the light intensity is reduced as light passes through the plant community, but the PAR is also changed.
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