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Which of the following scenarios best describes a density-dependent factor limiting population growth? a. An April blizzard kills off many migrating barn swallows, which could not tolerate the cold and snow. b. A homeowner sprays her lawn with broadleaf herbicide to kill the dandelions that have started growing there that spring. c. A particularly snowy winter makes it difficult for female deer to find food, thus affecting their ability to reproduce. d. A particularly dry summer shrinks and dries up many ponds in central Canada, causing increased aggression and competition for limited nest sites among female common goldeneyes (ducks). e. A tropical storm strikes one of the Hawaiian Islands and wipes out a population of nénés that had been recovering from near-extinction.

Respuesta :

Answer: d. A particularly dry summer shrinks and dries up many ponds in central Canada, causing increased aggression and competition for limited nest sites among female common golden eyes (ducks).

Explanation:

The density dependent limiting factor is the one which exerts it's effect on the population density based on the size and growth of the population. More the size of the population the profound will be the effect. The examples of the density dependent factors include the food availability, storm or any other natural calamity, scarcity of water, migration, disease and predation.

According to the given situation, the water is density dependent limiting factor this is because the water is available in less volume for building nests by ducks thus the ducks will compete for available water resource for building their nests. In the scarcity of water and incapability to build nests and survive the ducks may die.

Histrionicus

The following scenarios best describe a density-dependent factor limiting population growth - d. A particularly dry summer shrinks and dries up many ponds in central Canada, causing increased aggression and competition for limited nest sites among female common goldeneyes (ducks).

The density-dependent limiting factor

  • affects the population density based on the size and growth of the population.
  • the effect changes with the population size.
  • It includes factors such as:
  1. food availability,
  2. storm or any other natural calamity,
  3. scarcity of water,
  4. migration,
  5. disease and
  6. predation.
  • This option d is the only case that shows a density-dependent factor
  • the water is the density-dependent limiting factor this is as there is a scarcity of water for building nests by ducks
  • thus the ducks will compete for available water for building their nests
  • In the scarcity of water and incapability to build nests and survive the ducks may die.

Thus, The following scenarios best describe a density-dependent factor limiting population growth - d. A particularly dry summer shrinks and dries up many ponds in central Canada, causing increased aggression and competition for limited nest sites among female common goldeneyes (ducks).

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