Atlantic cod currently has a relatively small population in the Gulf of Maine. You learn that most populations would exhibit extremly slow growth rate, when the population size is too small to grow efficiently and productively. We call such factor that regulate population growth at a small popualtion density/size as [ ] (positivie or negative) density-dependent factor, also known as [ ] effect.
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Step 1: Identify the situation described in the question - the Atlantic cod population in the Gulf of Maine has a relatively small population size. Show more…
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Based on the simple food chain for cod shown here, and what you know about the biology of cod, propose one action that people could take to help the cod population recover. (3 marks) Phytoplankton (producers) → zooplankton → small fish, shrimp, crabs → cod One unforeseen development is that the small fish predators also compete with, and eat, the very young cod. This means that cod are more likely to be the prey of the small fish than to be their predators. The cod population can't increase because competition with, and predation by, the small fish prevents most cod from growing large enough to become the top predator in the web. Before the collapse, there were enough large cod to keep the numbers of small fish low, which gave the young cod a chance to grow up. This isn't the case anymore.
Adi S.
Density-dependent factors are population-regulating factors that $a$. affect the same proportion of individuals regardless of population size. $b$. are usually weather-related. $c$. affect only sessile organisms. $d$. influence only fecundity. $e .$ have effects that vary depending on population size.
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