Approximately how many kilograms (kg) of secondary consumer biomass can be suppo

Question

Approximately how many kilograms (kg) of secondary consumer biomass can be supported by a community containing 100 kg of producers? 1 kg 10 kg 1000 kg 100 kg Consider a predator-prey relationship between crabs and sea snails. The crabs use their claws and jaws to crock open the shells of the sea snails, and so, by the principle of selection with a thicker or more spiny shell would have an advantage and those traits would become more abundant. This in turn would create a selection pressure for stronger claws and jaws in the which in turn would give a selective advantage to snails with even thicker and spinier shells. This type of "arms race" between Predators and prey is as example of secondary succession coevolution primary succession symbiosis competition You observe two female fish of the same species breeding. One female lays 100 eggs and the other female lays 1000 eggs. Which one of the following is most likely given the trade-offs? The female who lays 1000 eggs breeds more often than the one who lays 100 eggs The female laying 1000 eggs has larger eggs than the female laying 100 eggs The female who lays 100 eggs breeds more often than the one who lays 1000 eggs The female laying 1000 eggs lives longer than the one laying 100 eggs

Explanation / Answer

51. Generally, only 10% of prey biomass consumed is converted into predator biomass. So if primary consumer eats 100kg of producer biomass, it only accounts for 10kg of new primary consumer biomass. A secondary consumer is only able to convert the 10kg of primary consumer biomass to 1kg of new secondary consumer biomass.

Thus the answer is 1kg,

52. Co-evolution describes the effect of different species on each other's evolutions. This is very clearly seen in species with predator-prey relationships, and is also evident in the example given.

Thus, the answer is co-evolution.

53. Reproduction is a costly affair. The energy ingested by the fish is allocated to both somatic grown and reproduction mechanisms, so there is constant competition between the two processes. Younger fish tend to lay less eggs than mature fish, as they prioritize survival. However, to make up for the smaller egg count, these fish will breed more often than the fish that produce 1000 eggs.

Thus, the answer is the female who lays 100 eggs breeds more often than the female who lays 1000 eggs.

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