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Title: Population/ ecosystem question Post by: mex on Mar 11, 2017 Question : http://imgur.com/a/6Gac4 (part a )
http://imgur.com/a/wHegf (part b ) Hi, I don't quite get part b ii). It says when the canopy closes, what happens to the ground vegetation. The answer would be that there is less growth in the ground vegetation but how can that be? Since you don't have the canopy blocking the sun, surely more sunlight is available to pass through to the lower vegetation for more growth, no? For III regarding to the shrew population, the effect is that there will be fewer of them. Why? I thought they only feed on the lower vegetation, why will they emigrate/ die? For c) I don't understand why the falling of leaves can create a more stable population, the answer says that 'No sudden drop in 1963-64/population stable Shrub / field / ground layers able to grow during Spring before canopy closes/more leaf litter so more nutrients' . I don't quite get this. Thanks Title: Re: Population/ ecosystem question Post by: bio_man on Mar 12, 2017 The answer would be that there is less growth in the ground vegetation but how can that be? I was thinking the same thing. One of the reasons is because photosynthesis slows down due to a lack of light. Similarly, the shrews will get affected due a slow down in vegetation - less food. Hope this helps you |