We might expect that populations near the periphery of a species’ range (marginal populations) might evolve greater tolerance of local conditions, which allow them to increase in numbers and thereby expand the species’ range. Why might this not be the case?

Species A experiences a mutation that produces a favorable allele to avoid predation by species B. In turn, species B experiences a mutation that helps it to counter the 'predator avoidance' allele that appeared in species A. What term best describes this situation?

Two species have the same initial population size of 48.00, as well as rates of b = 0.83 and d = 0.66. However, species A reproduces seasonally and species B reproduces relatively continuously. How much bigger would the population of species B be after five years as compared to species A?

How does territoriality causes uniform distribution within a population? Explain in detail

Which of the following terms best describes the biological scenario where species that look similar in allopatry look different in sympatry?   a. Character displacement   b. Tempo   c. Fusion   d. Post-zygotic barriers

Birds generally have life-histories that can be placed on a fast-slow continuum. Species with fast life-histories have shorter life spans while species with slow life-histories have longer life spans. With this in mind, what contributes more to population growth for species found on each end of this spectrum, adult survival or annual fecundity, and why?

what are some plausible phenotypic changes that we might see in different vector species as climate change progresses? How might these changes affect interspecific competition?

The yellow-legged gull (Larus michahellis) is a widespread species along the Atlantic coasts of France and the Iberian Peninsula, the Azores Islands, Madeira, the countries of the Mediterranean basin and the Black Sea. It was formerly considered as a subspecies of Herring Gull (L. argentatus), with which it coexists in some reproductive areas. Only recently L. michahellis has been recognized as a distinct species. Following detailed comparison of the two species, researchers found that the L. michahellis's restricted but dense head-streaking and advanced primary molt in late summer, are not compatible with L. argentatus. Larus michahellis has a proportionately longer, heavier bill and bulkier head and body than L. urgentutus. In addition, L. michahellis's yellow bill has a red gonydeal spot, both colors typically brighter than in L. urgentutus outside breeding season. They also have an orange-red to vermilion orbital ring and yellow legs. DNA research, however, suggests that the…

Gray whales ( Eschrichtius robustus) gather each winter near BajaCalifornia to give birth. How might such behavior make it easierfor ecologists to estimate birth and death rates for the species?