Ecology Biodiversity and Conservation Questions and Answers 1 — Questions and Answers
Question 1: A conservation team is managing a critically endangered mammal species whose wild population has been reduced to fewer than 50 individuals confined to a single, small protected area. Which of the following conservation actions should be prioritized to address the most immediate threat to the species' long-term persistence?
- Expanding the size of the existing protected area.
- Initiating a public awareness campaign to increase conservation funding.
- Establishing a captive breeding program using a subset of the wild individuals. (Correct answer)
- Conducting a multi-year study on the species' dietary habits.
Correct answer: Establishing a captive breeding program using a subset of the wild individuals.
With a population size of fewer than 50 individuals, the species is at extreme risk of extinction due to demographic stochasticity (random events affecting individuals) and severe inbreeding depression, which can reduce reproductive success and adaptability. A captive breeding program is the most direct and immediate action to increase population numbers, manage genetic diversity through controlled pairings, and create a safeguard population against catastrophes in the wild.
Question 2: A conservation plan is designed around protecting large, contiguous tracts of old-growth forest to ensure the viability of the Northern Spotted Owl. The rationale is that by protecting the extensive habitat required by the owls, numerous other species, from salamanders to mollusks, that also live in these forests will be indirectly protected. In this context, the Northern Spotted Owl is best described as a(n):
- Keystone species
- Indicator species
- Flagship species
- Umbrella species (Correct answer)
Correct answer: Umbrella species
An umbrella species is a species that has large habitat requirements or other needs such that protecting it will indirectly protect many other species within the same ecosystem. Because the Northern Spotted Owl requires large areas of old-growth forest, conservation efforts focused on the owl also conserve the habitat for a wide range of co-occurring species.
Question 3: According to the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) and a broad consensus among conservation biologists, which of the following is the single greatest driver of biodiversity loss on land?
- Changes in land use, such as deforestation for agriculture (Correct answer)
- The spread of invasive alien species
- Pollution from industrial and agricultural sources
- Direct exploitation of organisms, such as overhunting and overfishing
Correct answer: Changes in land use, such as deforestation for agriculture
While all listed options are significant threats, changes in land use—primarily the conversion of natural habitats like forests, grasslands, and wetlands into agricultural land, urban areas, and infrastructure—is recognized as the largest driver of biodiversity loss globally. This process causes direct habitat destruction, degradation, and fragmentation, which affects the vast majority of terrestrial species.
Question 4: A large coastal area of mangrove forest is cleared for the development of a commercial shrimp farm. Of the following ecosystem services provided by the intact mangrove forest, which one is most directly and critically lost, increasing the vulnerability of the adjacent inland community?
- Carbon sequestration and long-term carbon storage
- Buffering against storm surges and coastal erosion (Correct answer)
- Providing a nursery habitat for open-ocean fish species
- Regulation of local air quality through photosynthesis
Correct answer: Buffering against storm surges and coastal erosion
Mangrove forests, with their dense and complex root systems, act as a natural physical barrier that dissipates wave energy and stabilizes shorelines. Their removal directly exposes coastal communities to increased risks of flooding from storm surges, tsunamis, and chronic coastal erosion. While the other services are also important, the loss of this protective buffering service has the most immediate and critical impact on the safety and infrastructure of the community.
Question 5: An ecologist is assessing the health of a threatened population of panthers by analyzing DNA samples to determine the frequency and distribution of various alleles for key immune system genes. This investigation is focused on measuring which level of biodiversity?
- Ecosystem diversity
- Species diversity
- Genetic diversity (Correct answer)
- Functional diversity
Correct answer: Genetic diversity
Genetic diversity refers to the variety of genes and alleles within a species or population. By studying the different alleles for specific genes, the ecologist is directly measuring the amount of genetic variation present, which is crucial for a population's ability to adapt to environmental changes and resist disease.
Question 6: Which of the following conservation efforts is a clear example of an *ex-situ* conservation strategy?
- Establishing a marine protected area to conserve a coral reef.
- Restoring a degraded wetland to support migratory bird populations.
- Creating a wildlife corridor to connect two fragmented forest patches.
- Operating a cryogenic seed bank to preserve the genetic material of rare and endangered plants. (Correct answer)
Correct answer: Operating a cryogenic seed bank to preserve the genetic material of rare and endangered plants.
*Ex-situ* (literally 'off-site') conservation involves protecting a species outside of its natural habitat. A cryogenic seed bank removes genetic material (seeds) from the natural environment and preserves it in a controlled, artificial setting. The other options are all examples of *in-situ* ('on-site') conservation, as they focus on protecting species within their natural ecosystems.
Ecology Biodiversity and Conservation Questions and Answers 1
A conservation team is managing a critically endangered mammal species whose wild population has been reduced to fewer than 50 individuals confined to a single, small protected area.
Which of the following conservation actions should be prioritized to address the most immediate threat to the species' long-term persistence?