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Chapter 36: Problem 11

Albatrosses are birds that can live to age 60 and older. They usually do not start breeding until they reach age 8 or 9, which is relatively late compared to other bird species. Based on this information, explain conditions that might be a risk to the survival of albatrosses. a. increased chance of individuals dying before reproducing b. decreased life spans of individuals c. increased chance of offspring dying d. decreased chances of mating between individuals

Short Answer

Expert verified
Risks include dying before reproducing, decreased lifespan, higher offspring mortality, and fewer mating opportunities.

Step by step solution

01

Understand the lifespan and breeding age

Albatrosses can live up to 60 years or more, but they only start breeding at the age of 8 or 9. This is relatively late compared to other bird species.
02

Identify the main risk factors

Given the long time until they start breeding, analyze how this delay could impact their population.
03

Increased chance of dying before reproducing

If albatrosses don't start breeding until age 8 or 9, there is an increased risk that some individuals may die before they get the chance to reproduce.
04

Assess decreased life spans

If the overall lifespan of albatrosses were to decrease, they would have a shorter period during which they could potentially breed, which could reduce population numbers.
05

Evaluate increased chance of offspring dying

If there is an increased chance of offspring not surviving, this would result in fewer adult albatrosses, which could decrease population size.
06

Analyze decreased chances of mating

With a lower number of breeding pairs due to various risks, there would be fewer opportunities for albatrosses to mate, affecting their survival.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Breeding Age Impact
Albatrosses start breeding relatively late, at around 8 to 9 years old. This late breeding age can significantly impact their population dynamics. As albatrosses must survive nearly a decade before they can reproduce, there is a considerable risk that some may die before reaching reproductive maturity. Consequently, fewer albatrosses contribute to the next generation. This delay in breeding means that any changes to their environment that reduce their lifespan or increase the risks faced during their early years can have profound effects on their overall population.
Population Dynamics
The population dynamics of albatrosses are heavily influenced by their breeding age and other survival risks. Since many individuals may not survive to their first breeding age, the population growth rate slows down. If many albatrosses die before reaching reproductive age, the next generation will be smaller. This can lead to a decline in population over time. Additionally, environmental factors and human activities, such as fishing and pollution, can further reduce their numbers by increasing mortality rates among both juveniles and adults. Therefore, understanding and managing these dynamics is crucial for the conservation and survival of albatross populations.
Threats to Bird Survival
Several threats can impact the survival of albatrosses, affecting both individual birds and populations as a whole. Key threats include:
  • Bycatch in fisheries: Albatrosses often get caught in fishing gear, leading to injury or death.
  • Pollution: Marine debris and oil spills can contaminate their habitat and food sources.
  • Climate change: Changes in sea temperature and food availability can negatively impact their survival.
  • Habitat loss: Coastal development and human activities can reduce the breeding and feeding areas available.
These threats increase the likelihood of albatrosses dying before reaching reproductive age, reduce their life spans, and decrease the chances of successful breeding across their lifetimes.
Reproductive Maturity in Birds
Reproductive maturity refers to the age at which birds can start breeding. For albatrosses, reaching reproductive maturity at 8 to 9 years old is quite late compared to other bird species. This extended period before they can reproduce poses several risks. Since they need to survive many years before breeding, their overall chance of reproduction is lower. Additionally, their reproductive window is shorter because they have fewer years left in their lifespan once they reach maturity. Conservation strategies must account for this delayed maturity to ensure that the population remains sustainable.

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Most popular questions from this chapter

Mammals such as humans show a behavior known as the flight or fight response. Explain how natural selection was likely involved in the development of this behavior that can be observed in humans today. a. Individuals showing fight or flight behavior was more likely to survive than individuals lacking the trait. This trait got randomly selected by natural selection, thus became preferentially incorporated into the human lineage. b. Individuals showing fight or flight behavior were more likely to survive than individuals lacking the trait. Sudden, inheritable changes were naturally selected, which included the fight or flight behavior. Thus, this response was incorporated into the human lineage. c. Individuals showing fight or flight behavior were more likely to survive than individuals lacking this trait. Therefore surviving individuals passed on their trait to offspring while nonsurviving individuals do not. Thus, this response became incorporated into human lineage. d. Individuals showing fight or flight behavior were not more fit than individuals lacking this trait. However, the trait was selected by natural selection due to a random chance event in the gene frequency of individuals showing fight or flight behavior

A forest fire is an example of ____ regulation. a. density-dependent b. density-independent c. r-selected d. K-selected

A flask of nutrient broth, buffered to maintain pH, is inoculated with a strain of E. coli. The flask is placed in a constant temperature environment where it is aerated by shaking. A. Predict the effect of a change in energy availability over time. B. Represent the change graphically in terms of the number of cells as a function of time. C. In your graph as time progresses there is a change in the growth rate of the population. Add annotation to your graph to describe the time interval during which the growth rate is increasing linearly in proportion to the number of cells. Add annotation to your graph to describe another time interval during which the growth rate is decreasing in proportion to the square of the number of cells. Add a third annotation to describe an interval of time where the rate of growth is zero. D. Select and justify two measurements of the E. coli population that could be made at two different points in time during growth that would be sufficient to answer questions about the population size at any time. E. Describe the population of E. coli if the environment was continuously supplement by additional nutrient broth.

Identify the statement that best describes a pioneer species. a. A pioneer species is a species that is transported out of its native habitat into a non-native habitat, where there are few or no natural predators to keep the population in check. b. A pioneer species is a species that maintains the community structure in an ecosystem, and whose loss causes the ecosystem to fail. c. A pioneer species is a species that has the greatest influence over the ecosystem usually by bringing most of the energy into the system. d. A pioneer species is a species that can colonize landscapes that are devoid of soil and begin the process of succession

Monarch butterflies in the eastern regions of North America migrate thousands of miles to an area in Mexico in the fall and then back to northern regions in the spring. Explain how this migration behavior came to be established in this species. a. Each new generation learned the migration behavior by observing older generations and mimicking their behavior patterns. b. In very early generations of this species, a few individuals found that migration improved their chances for survival and taught their young to carry on the behavior. c. Individuals that migrated survived through the winter, whereas individuals that did not migrate died, leading to selection for migration in later generations. d. When this butterfly emerged as a new species, by chance it inherited the genetic material that underlies long-distance migration behavior from its ancestor.
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