+ At least a few individuals are still present. No individuals are still present. The species may soon go extinct. The population is beginning to shrink in size. Decreasing numbers may be the result of habitat loss. The species will be protected by the Endangered Species Act. The species may recover if it is protected. Threatened Endangered

+ At least a few individuals are still present. No individuals are still present. The species may soon go extinct. The population is beginning to shrink in size. Decreasing numbers may be the result of habitat loss. The species will be protected by the Endangered Species Act. The species may recover if it is protected. Threatened Endangered

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter19: Population And Community Ecology

Section: Chapter Questions

Problem 2ACQ: Figure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the...

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Which of the following is not a part of the red list criteria for "critically endangered" species? The population is expected to decline by 25% or more within 3 years or 1 generation. The species has a restricted range <100km2 at a single location and there is observed or predictive habitat loss, fragmentation, ecological imbalance or heavy commercial pollution. Extinction probably is greater than 50% within 10 years or 3 generations. The total population size is less than 200 mature individuals.
explain the following Effects of wild life depletion Unbalanced food chain and ecosystem Reduction in rare wild animals Danger to human life Impact on biodiversity Loss of economic value Loss of genetic information
What do restocking programs for wild animals involve? Releasing individuals into an existing population to increase the size of the population and the diversity of its gene pool Releasing wild-collected individuals into a new site Releasing captive-bred individuals into a new site Releasing captive-bred or wild-collected individuals into an ecologically suitable site within their historical ranges where the species no longer occurs
The per capita growth rate of a population where dispersal is not a factor is expressed as (a) i + e (b) b d (c) dN/dt (d) rN(K N) (e) (K N) K
_______________ competition occurs within a population, and _______________ competition occurs among populations of different species. (a) Interspecific; intraspecific (b) Intraspecific; interspecific (c) Type I survivorship; Type II survivorship (d) Interference; exploitation (e) Exploitation; interference
Figure 45.10b If the major food source of the seals declines due to pollution or overfishing, which of the following would likely occur? The carrying capacity of seals would decrease, as would the seal population. The carrying capacity of seals would decrease, but the seal population would remain the same. The number of seal deaths would increase but the number of births would also increase, so the population size would remain the same. The carrying capacity of seals would remain the same, but the population of seals would decrease.
Figure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the following would likely occur? a. The carrying capacity of seals would decrease, as would the seal population. b. The carrying capacity of seals would decrease, but the seal population would remain the same. c. The number of seal deaths would increase, but the number of births would also increase, so the population size would remain the same. d. The carrying capacity of seals would remain the same, but the population of seals would decrease.
The population size of a species capable of being supported by the environment is called its ________. a. limit b. carrying capacity c. biotic potential d. logistic growth pattern
What level of disturbance allows the greatest coexistence among species? Y At what level of disturbance is interspecific competition the greatest? X Many #Species in Community Few Low X Y Level of Disturbance High N
Which of the following is true with regards to establishment programs? Which of the following is true? Success was greater in the periphery and outside of the historical range than in the core Success was greater in depauperate habitats than in species rich habitats Success was greater for captive-reared than with wild-caught Success was greater for herbivores than carnivores
ENDANGERED ANIMAL is CA least tern bird 1-3 bases on the bird Reasons for Endangerment Explain the various factors that have led to this species’ current plight. Expand on these points individually, based on your species’ unique story. Domino Effects As we’ve learned, species are not islands unto themselves; they are integrated with many other organisms in trophic relationships, mutualisms, competition, etc. How is the absence of this species (or its lowered population size) likely to impact the other members of its habitat? (If findings specific to this point are available, please include them – otherwise, I’m asking you to speculate based on what you’ve learned about the biology of this organism.) Conservation Efforts Discuss past, current, and proposed efforts to conserve this species. Are these strategies effective? Are they realistic? What is the outlook for this organism?
What is the main factor that limits population growth for in the fish case study? What is the main factor that limits population growth for in the fish case study? Interspecific predation Social behavior Intraspecific competition Diseases and parasites