If human activities allow an invasive species to thrive, its speciation and population growth rates may be higher at the same time that it depresses speciation and growth rates of other species. True False
Q: extinction
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- We might expect that populations near the periphery of a species’ range (marginalpopulations) might evolve greater tolerance of local conditions, which allow them to increase innumbers and thereby expand the species’ range. Why might this not be the case?Which of the following would be considered a factor affecting species distribution? Habitat selection Oxygen availability Number of births in a year Death rates due to illness Temperature of the environmentWhich 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.
- You arrive on an alien planet and settle down to live there for a long time. There are very few species. Two of the species (A and B) are sometimes common and sometimes rare. When you start keeping track of population changes you discover that the population sizes fluctuate on a regular cycle in close synchrony. Species B always increases first, followed by species A. Which of the following would be the best explanation for what you are seeing? Group of answer choices -Species A is a predator and there is a time lag between changes in the density of its prey and species A's population change -Species A is a predator and it can respond instantly to changes in its prey population -Species B is a predator and there is a time lag between changes in the density of its prey and species B's population change -Species B is a predator and it can respond instantly to changes in its prey populationWhich of the following is a conclusion drawn by the authors from the results of this study? Temperate marine invertebrate species are outcompeting endemic species which will soon become extinct in the surveyed areas. Tropical marine invertebrate species did replace temperate species from 1982 to 2021 in the surveyed areas. Tropical marine invertebrate species did not replace temperate species from 1982 to 2021 in the surveyed areas. The temperate marine invertebrate species density and richness will recover with sufficient monitoring and resources. Article Reference: Responses of intertidal invertebrates to rising sea surface temperatures in the southeastern Indian Ocean By: Fred E. WellsThe smallest population of a species that is likely to be able to survive in the long term is called the_________ . When suitable habitat for a given species is split up into areas that are too small to support a large enough population, this is called_______ . One way to maintain large enough populations is to set up core reserves of suitable habitat, connected by_______ .
- A biologist determines the growth rate of a population of 198 frogs in a marsh near Beaverhill Lake, Alberta, to evaluate the quality of the environment. The researcher finds that, in one year, 34 were born, 86 died, 12 migrated into the marsh, and there was no emigration. a. frogs are considered an indicator species for the quality of the environment. Determine whether the growth rate of this population in one year is a cause for concern. if so, what might the concerns be?Several alternative definitions of the term species have been proposed, recognizing different species, definitions raises conceptual problems, but it does not have practical implications for conservation true or falseThe island of Guam in the South Pacific had no natural predators until the early 1950s, when the brown tree snake was accidentally introduced by either ships or aircraft shortly after the Second World War. Scientists studying the effects of this invasive species surveyed five different native bird species in an area of northern Guam that the brown snake had recently invaded. The graph shows the population data of the five different native bird species from 1976 to 1998. Which of the following best describes the data and explains the effect of the arrival of the brown tree snake on Guam’s native bird species?
- Which of the following scenarios does NOT describe a population with a clumped distribution? A. group defense against predators B. even distribution of resources throughout the population’s habitat C. competition for mates D. seasonal migrations to follow food sourcesBob Davison describes the Endangered Species Act (ESA) as an effective tool for conserving biological diversity. What is his rationale for the value of focusing on individual species? The public is not concerned about the economic costs of individual species recovery. A focus on individual species is cheaper than protecting entire ecosystems. Establishing public empathy for charismatic species provides an opportunity to educate people about lesser-known species. The public tends to value intact ecosystems over particular plant and animal species.How is a clumped population distribution beneficial for prey animals? a. Being a member of a larger group provides protection for each individual from predators. b. Prey animals rely on each other to acquire food. c. Prey animals live in small family groups to raise young. d. Clumped population distributions ensure that at least one member of the population knows how to identify the seasonal migration route.