The long-term study by Krebs on the population dynamics of snowshoe hares and lynx has become a textbook example of predator-prey relationships. The population cycles he observed are the result of both biotic and abiotic factors affecting prey populations. List 3 factors that can contribute to population cycles and briefly explain their effects

Population growth is exponential for the human population. It is an example of a positive feedback cycle where with each child born, the potential number of parents increases in the future. What is the most logical conclusion as to when the human population will reach its carrying capacity? A.  When a regulating factor exists that keeps the population at equilibrium B. When feedback mechanisms kick in and population growth declines below carrying capacity  C.  When equilibirum is reached D. When density-dependent factors come into play and population levels start to decline ❌

A gypsy moth population has overtaken a grove of oak trees. The gypsy moths eat the trees, causing the trees to die. What type of density-dependent factor would the gypsy moths be considered?          predation         disease and parasites         competition         physiological change

Previous question: (Assume that for a given population of moose, the per-capita birth rate remains constant with population size. However, as the moose population size increases there is a linear increase in the probability of starvation and subsequent mortality due to intraspecific competition.) Assume that the population (from the previous question) does not experience competition from other species, nor predation. Write out the equation that would best be used to describe the change in population growth from one time interval to another.

In the Lotka-Volterra predator-prey model, the term for the rate of prey capture as a function of prey abundance is a. exponential response O b. functional response С. numerical response O d. logistic response

Which of the following best predicts the consequences of introducing small Indian mongoose to an island where they did not previously exist?( Invasive species) (Choice A) A The mongoose population will grow rapidly, disrupting the island's community structure by preying on native animals. (Choice B) B The mongoose population size will likely remain smal, and as a result the mongoose population will not be able to outcompete other predator populations for resources. (Choice C) Without any natural diseases, the mongoose population will become established and help increase the species diversity of the island. (Choice D) D Without its typical food sources, the mongoose population will not be able to become established, and the island ecosystem will remain stable. answer explain

The ten-year cycles of the populations of the snowshoe hare and Canada lynx were first recorded from fur returns of Hudson's Bay Company traders in the late 1800s. The cycles revolve around the lynx's preference for hares over other animals as a food source. This predator-prey relationship is again being studied by the Northwest Territories Department of Renewable Resources, in an area known as the Mackenzie Bison Sanctuary. 1991 1992 N = 19 100 kam 100 km N = 3 100 km 100 km Legend:a=I Lynx 1a. Calculate the density of the lynx population in 1991 and 1992. Show your work. 1b. Calculate the per capita growth rate for the lynx population from 1991 to 1992. Show your work.

Calculate the rate of population change for a hypothetical population of wildebeest using the  logistics equation and carrying capacity equation. How can you explain these results?  N = 500, r = 0.1, K = 1000, calculate dN/dt.

The following pattern(s) of population dynamics is(are) produced from the Lotka- Volterra model assuming exponential increase in the prey population in the absence of predators, and exponential decline in the predator population in the absence of prey. а. Stable cycles b. Chaos O c. Equilibrium O d. Damped Oscillations O e. More than one of the above is possible

Vicuña are ungulate herbivores related to llamas that occupy high mountain grasslands in the Andes. They are valued for their wool. Overhunting led to global population declines from millions in the 1500s to thousands in the mid 1900s.Lauca National Park was established in Chile in 1970 and banned hunting of vicuña. Researchers used census data (solid circles) to fit the population dynamics, and evaluated two models: one in which the carrying capacity was fixed over time (“Logistic Constant K”, dashed line), and one in which the carrying capacity could vary over time (“Logistic Variable K”, solid line). See attached image What type of factor is rainfall in regulating vicuña population growth? A. Density-independent; Bottom-up B. Density-independent; Top-down C. Density-dependent; Bottom-up D. Density-dependent; Top-down