24 rabbits were brought to Australia in 1859 and 6 years later there were 240,000. What is the intrinsic rate of increase? If 100 mosquitos invade an island and have an intrinsic rate of increase of 1.2, how many will there be in 10 years?
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24 rabbits were brought to Australia in 1859 and 6 years later there were 240,000. What is the intrinsic rate of increase?
If 100 mosquitos invade an island and have an intrinsic rate of increase of 1.2, how many will there be in 10 years?
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- If 100 mosquitos invade an island and have an intrinsic rate of increase of 1.2, how many will there be in 10 years?The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes? a) The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization b) Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. c) DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. d) Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT.Which row below best describes why the population of adult mosquitoes would drop so dramatically during this time period Feb. 5, 2007 Something is wiping out honey bees across North America and a team of researchers is rushing to find out what it is. What’s being called Colony Collapse Disorder (CCD) has now been seen in Pennsylvania, North Carolina, Florida, Georgia and way out in California. Some bee keepers have lost up to 80 percent of their colonies to the mysterious disorder. Whatever kills the bees targets adult workers, which die outside the colony — with few adults left inside, either alive or dead. The disorder decimates the worker bee population in a matter of weeks. Aside from making honey, honey bees are essential for the pollination of tens of million of dollars worth of cash crops all over the United States. That’s why almond growers of California, for instance, are taking notice and pledging funds to help identify and fight the honey bee disorder. Among the…
- A population of 30 rabbits has been introduced into a new region. It is estimated that the maximum population the region can sustain is 400 rabbits. After 1 year, the population is estimated to be 90 rabbits. How many rabbits will there be after 3 years? In a city whose population is 100 000 an outbreak of flu occurs. When the city health department begins, its record keeping, there are 625 infected people. The number of infected people N is increasing at a rate proportional to the square root number of infected people at time t in weeks. One week later, there are 1600 infected people. Find the number of infected people two weeks after the record keeping begins.given the life table of bees, please make a survivorship curve like on the example graph. what type of survivor ship curve is the table below?Plasmodium is a vector for mosquitos. It is a protozoan that is the causal agent of malaria, which is responsible for killing as many 855,000 people in 2013, the majority of them being children. Populations of mosquitos are strongly influenced by the availability of standing water for egg-laying and larval development. How might mosquito density, and thereby human mortality, be affected by patterns of rainfall?
- In a habitat there are 7,500 individuals of P. rufipes, 40% of which have long and thin ovipositors and 60% have short and thick ovipositors. During a single year 250 wasps with long and thin ovipositors died while 325 were born. In that same year, 650 wasps with short, thick ovipositors were born and 800 died. Calculate the per capita growth rate (r) of the two subpopulations of P. rufipes. Per capita growth rate of P. rufipes with long and thin ovipositors: _________ Per capita growth rate of P. rufipes with short and thin ovipositors: _________Using the equation for R0, explain how transmission rate, host population size, virulence, and recovery rate affect a parasite’s fitness. Can you relate the equation for R0 to a diagram of a SIR model? How does R0 relate to dI/dt?Honey bee workers from a colony in North Carolina are visiting two food sites, A and B, at 6 am as shown below. Site A is 1500 m from the hive; site B is 300 m from the hive. While most of the foragers are out in the field, a sudden downpour strikes which drowns many of the bees outside the hive. As a result, there is a shortage of foragers in the nest at a time when much food is available in the field. Which of the following can you correctly predict will happen: a. The loss of foragers will cause increased activity of the Gp9 gene in some of the bees inside the nest, which will decrease their JH levels, causing them to revert to nursing behavior and raise more brood to quickly replace the lost foragers. b. The loss of foragers will result in decreased transfer of ethyl oleate to the younger bees, which will cause JH titers in some of the younger bees to increase and they will become precocious foragers. c. The loss of contact with older bees will cause increased Amfor and…
- Using the basic S-I-R model of parasite and host dynamics, explain why the proportion of infected individuals in the population declines over time.given the life table of bees, please make a survivorship curve like on the example graphBack at the original iguana population, only 40 iguanas remained. This population also has a growth rate of 0.6 and generation time of 2 years. But the island on which this population resides is much smaller and has a carrying capacity of 200. How many iguanas do you expect to find in the original population after 6 years?