Question

Q6. Imagine that the population of aquatic insects doubled in a certain pondweed area. How would the net primary productivity change from an area where the aquatic insect population were at the normal level? In your answer, make sure you explain what net primary productivity is and why it would change with more insects.

In addition to grass carp, another large herbivore in the Great Lakes are Canadian geese. Early accounts by naturalists in the 1800s suggest that grass carp and Canadian geese were often seen feeding side by side among pondweeds. However, in the last three decades, this is rarely seen. Imagine that grass carp and Canadian geese previously ate both floating-leaf pondweed and curly-leaf pondweed and there was significant competition between them. However, there were some individuals of grass carp that specialized on pondweed patches dominated by curly-leaf pondweed and there were some individuals of Canadian geese that specialized on patches dominated by floating-leaf pondweed.

Q7a. In the space below, draw 2 figures. The first one showing the niches for grass carp and Canadian Geese in the early 1800s with regard to the type of pondweed they fed on and then a second figure showing the niches now. Make sure you properly label the axes, tick marks, and including an appropriate figure legend.  

Q7b. What is an explanation for why we see the pattern shown in your figures above occur often in ecology?  

Q8. Imagine that a forest along a small inlet of the Great Lakes was clear cut and replaced by a large farm growing corn. The farmer uses a large amount of fertilizer just before a large rain storm comes through the area. Two weeks later there is a dead zone in the small inlet of the lake. List 3 ways in which humans have impacted the nitrogen cycle in this example.

1.

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Q8b. Explain in 2 sentences why a dead zone occurs.

Answer 1

Net primary productivity ia defined as the biomass that is available to the consumer at the next level . Net primary productivity is the primary productivity of the organism minus the plant that is used in the metabolism of the organism . It is also described as the Gross primary productivity minus the respiration of the organism . It is the biomass that is present in am individual for the next trophic level.The plant fix arround 1.6% of the solar energy . About 1% of the total sunlight that is present on the Earth can be defined as the net NET productivity . The Net productivity remains same at the primary trophic level. But the Net primary productivity increases and rise to double at the insect level . As the rise in populatiom leads to increase in the Gross primary productivity and it further leads to increase in the Net productivity therefore, the Net primary productivity increases in this case ,

The biomass of the insects is more available for its comsumer that is the biomass of insect or the Net primary productivity can also be determined by the ecological pyramids at the various trophic level.

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