12 Jun Wilfrid BIOL 301 – A unit used to describe levels of biological
Question
Q1: A unit used to describe levels of biological classification is referred to as:
Species
Taxon
Population
Hierarchy
Q2: Adolf Engler produced the first world map in 1879 that depicted what?
Biogeographic regions of plants and animals
Four major floral regions in the world
Biomes
Political regions
Q3: Vicariance was proposed by Leon Croizat to explain patterns of species distributions. This idea required:
Land linkages among all land masses on earth
Colonization of all land masses by slow spread over continuous land
Creation of barriers after dispersal had occurred
All of these were required for Croizat’s ideas
Q4: What was the central concept of Croizat’s theory of vicariance that has proven to be correct?
Speciation events occur following creation of a barrier
Organisms have always occupied the land in which we now see them
All land on earth was in the past connected, including island masses
All of these ideas have proven correct – Croizat was ahead of his time
Q5: Islands are evolutionary hotspots have long been the focus of interest by biogeographers. Robert MacArthur and Edward Wilson revolutionized the study of island biogeography through their work “The Theory of Island Biogeography”. Which key concept has proven to be correct when considering biodiversity on islands?
Changing and interrelated rates of extinction and colonization will eventually lead to an equilibrium between these two processes
Island area predicts the number of species it contains
The origin of the island is an important determinant of species richness
Islands are more sensitive than mainland areas to disturbance
Q6: The Palmae (palms) have a global distribution but it is restricted largely to tropical and subtropical areas. Why has such a successful tropical species failed to become similarly successful in temperate regions?
Palms have a single growing point on their stem that is held aboveground making this family highly sensitive to frost
Angiosperm trees have outcompeted palms in the temperate regions and palms are an evolutionary relict
Ocean currents do not travel in such a way as to carry palm seeds to temperate locations
All of these factors are important in the distribution of the Palmae
Q7: The niche concept is central in biogeography. Which of the following comprise our understanding of a species’ niche?
Biotic interactions
Climate
Resource availability
All of these are necessary in our understanding of a species niche
Q8: The ecological tolerances of a eurytopic species can be described as:
Very specific or narrow
Broad
Limited to the northern hemisphere
None of these describes the requirements of a eurytopic species
Q9: What information do we require to explain the current distribution of postglacial relicts?
Their ecological tolerances
Their biotic interactions
Patterns of post-glacial sea level changes
Locations of glacial refugia
Q10: Which of the following describes endemic species?:
Distribution is limited to a single geographic location
They are found more commonly on islands and in mountain regions
They are of special concern from a conservation perspective because of their potential sensitivity to disturbance
All of these are important
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