Total Number of Tree Snails (N)5003002008888888700600400100019971999200120032005Year2007 200920112013Figure 2. Achatinella lila captive population growth after its founding in 1997 with seven snails. Thepopulation peaked in 2009 with 668 snails and declined to less than 200 snails by 2013.Why does the population of tree snails experience a drop after the initial increase?000snails were not adapted to living in captivityauthors attribute the increase of genetic diversity to the population dropa viral infection decimated the snail population in 2009 and consecutive yearsa genetic bottleneck led to reduced genetic diversity and fecundity

Based on the choices given to explain why the population of tree snails experienced a drop after the…

Answered: Total Number of Tree Snails (N) 500 300…

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter16: Population Ecology

Section: Chapter Questions

Problem 2DID

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Back 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?
The Arizona Forest occupies 87,174,334,009 sq. miles land that cater different kinds of species. One of which were the leopards. As of 2019, the total population of leopards is 26,753. Due to severe changes of the environment, there is an average of 571 leopard’s dies while only 255 were given birth each year. In 1950, their population is 63% higher from the current population. Calculate for: Population Growth rate Select one: a. 244.26% b. 244. 25% c. 244. 28% d. 244.29%
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 The researchers found that rainfall ~4 years prior was a good predictor of the population size of vicuña in a given year. Is rainfall four years before 1990 likely to be lower than average or higher than average? Why?
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
Population size increases whena. the sum of birth rate and death rate exceeds the sum ofimmigration and emigration.b. the sum of birth rate and immigration exceeds the sum of deathrate and emigration.Figure 37.20 Opportunistic and Equilibrium Species:A Summary.• High reproduction rate• Many ospring• Each ospring receives littleparental care• Low survival rate for juveniles• Early reproductive maturity• Type III survivorship curve:Opportunistic life history Equilibrium life history• Low reproduction rate• Few ospring• Each ospring receivesextensive parental care• High survival rate for juveniles• Late reproductive maturity• Type I survivorship curve:AgeSurvivorsAgeSurvivors764 UNIT SEVEN The Ecology of Lifehoe2420X_ch37_748-765.indd 764 12/15/16 11:45 PMc. the sum of birth rate and emigration exceeds the sum of death rateand immigration.d. the sum of death rate and immigration exceeds the sum of birthrate and emigration.
The per capita growth rate of the Colorado River fish is 27.0. The change in the size of the population of these fish over a period of six years was 541. The initial size of the population of Colorado River fish is ?
During a 24-month period of time, a population of 5 000 prairie dogs experienced 6 500 births and 5 560 deaths. Forty-two prairie dogs left the population and 85 prairie dogs joined the population. Show all work and explanation.a) The population change of prairie dogs is a. 6 585 b. 5 602 c. 983 d. 941 b)During the 24-month time period, the growth of the prairie dog population is a. 983 prairie dogs/year b. 492 prairie dogs/year c. 291.5 prairie dogs/year d. 41.0 prairie dogs/year c) Calculate the per capita growth rate of the prairie dog population AND the per capita growth rate per year of the prairie dog population. Show all work.
Which of the following populations would be growing? a) Geometric rate (1) = 0.63 b) Exponential growth rate (r) = 0.63 c) Net reproductive rate (R0) = 0.63 d) All of the above populations are growing
A coyote population in Colorado has 40 individuals, the potential reproductive rate per individual per year is 1.5, and the carrying capacity of the area is 50 coyotes. In the same habitat, the bobcat population has 30 individuals, the potential reproductive rate per individual per year is 2, and the carrying capacity of the area is 100 bobcats. The bobcats depress population growth of coyotes through competition by 0.20, while the coyotes depress population growth of bobcats through competition by 1.1. What will the population size be for coyotes next year? *Note that this is the other half of the bobcat question, and you need to round your answer to a whole animal. 40 5 45 16 55
For each organism, create a survivorship curve by plotting the given information in a line graph. Title each graph "Survivorship Curve for [name of organism]." The y-axis should be labeled "Survivorship" and contain low, medium, and high indicators. The x-axis should be labeled "Life Span" and contain young, middle-aged, and old indicators. American toads practice explosive reproduction. During the first warm days in spring, both males and females migrate from forests and converge on ponds. Reproduction is quick, taking only a few days. Females lay hundreds of eggs in jelly-filled sacks along the sides of the pond or stream. As soon as the eggs are laid, males and females abruptly leave the pond. Even before they hatch, the offspring are prone to high rates of predation. Many offspring die before they reach adulthood. Of the offspring that do survive, some will die in adulthood, and some will live their entire natural life span.
Eastern loggerhead shrike is a critically endangered species of bird in Canada. Its population has been declining since the 1960s, and it has been speculated that habitat loss, pesticide usage combined, and climate change have affected the shrike population size. In 2004, there were approximately 70 loggerhead shrikes breeding in Canada. Over the next five years, 111 new shrikes were born, 57 died, and 15 left the area. Calculate the change in the population of eastern loggerhead shrike between 2004 and 2009. Express your answer rounded to the nearest whole number. Answer
What factors led to the dramatic decrease in population growth rates in Kerala, India?Compare the case of Kerala to India’s national population control program put intoplace in the 1970s.

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