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When we think of islands, we often think of them as land masses surrounded by water. Ecologists have suggested a much broader definition of an island. Which of the following would NOT be viewed as an island by an ecologist?

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Keith Leannon
Keith LeannonLv2
22 Jan 2020
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Related questions

Are my answers to the following correct?

True, False, True, C and A,B,D

1. Species accumuation are used to estimate local, or alpha,diversity.

2. The shape of a species accumulation curve depends, in part,on the order in which sampes are processed.

3. Species accumulation curves are not needed when a completecensus is available.

4. Which of the following statements about beta deiversity isFALSE?

a. Beta diversity measures how quickly species compositionchanges across the landscape

b. There are a variety of different ways researchers havemeasured beta diversity

c. Relatively flat, homogeneous habitats tend to have higherbeta diversity

d. Beta diversity changes depending on the scale at which youmeasure it

5. Paul Ehrlich and E.O. Wilson offered a number of reasons toprotect biodiversity. What were they?

a. Earth cannot "survive" antoher mass extinction event

b. People have an aesthetic and moral obligation to protectEarth's species

c. Earth's biodiversity may provide us with important newresources in the future

d. Loss of biodiversity may reduce ecosystem services that wouldbe difficult to replace

False, False, True, True, Sahara dessert, Secular migration andSweetstakes route

6. Immigration rates decline as the size of an islandincrease.

7. Extinction rates decline as the number of species on anisland increases.

8. Extinction rates increase as the size of an islanddecreases.

9. All else being equal, turnover rates are higher on smallislands than on large ones.

10. When we think of islands, we often think of them as landmasses surrounded by water. Ecologists have suggested a muchbroader definition of an island. Which of the following would NOTbe viewed as an island by an ecologist?

a. Mountain top habitats

b. Urban parks

c. Caves

d. Sahara desert

11. Horses originated in North America and then migrates to Asiaand Europe. As they migrates, they evolved over many generationsinto the horse species we see today. This is an example of whichmigration type?

a. Diffusion

b. Jump dispersal

c. Secular migration

12. Horses went extinct in North American and did not returnuntil they were ferried in boats by European settlers (no landmammal can swim on its own across an ocean). From a horse'sperspective, the ocean barrier is best described as...?

a. Corridor

b. Filter

c. Sweepstakes route

a) Lets think beyond the individual. A population of tortoises lives on the island of San Cristobal in the Galapagos islands.

Tortories are diploid.

There are 100 individuals on the island.

The gene responsible for shell shape is autosomal and has two forms: Rounded (R) or Saddleback(r).

The frequency of R in the population is 0.7; the frequency of r is 0.3

How many R copies of the gene are in the population?

b) Let us assume that all individuals have equal opportunity to mate and that alleles are equally distributed among males and femals.

Use the Punnet Square method ( or a modification of this) to calculate the expected frequency of each tortoise shell genotype in the next generation.

(HINT: Think of a coin flip as a punnett square, then think of a coin that is not "fair", meaning it is more likely to land on heads. how would you modify the ###s you use to calculate probabilities { which in this case are equal to expected frequencies}

QUESTION 3

Which of the following would NOT be a good method for sortingout the evolutionary relationships between a parrot, gorilla,hippopotamus, starfish, and catfish?

comparing the skeletal anatomy

examining the habitat in which these organisms live

looking at embryos for common developmental patterns

comparing the nucleotide sequence divergence of selectedgenes

all of the above would provide useful information

10 points

QUESTION 4

Which of these habitats should have the highest number ofendemic species (found there and nowhere else).

grasslands of the central United States

Hawaiian islands

Amazonian rainforest basin

Mississippi river

10 points

QUESTION 5

Darwin's concept of evolution "the theory of descent withmodification through variation and natural selection" can bedemonstrated by which of the following examples?

A giraffe stretches his neck to reach higher branches. Theexercise of stretching up strengthens the muscles in the neck andlegs. This ability to stretch is also seen in the giraffe'soffspring.

A monkey accidently drops her fruit in the salty water of a bay,she recovers the fruit and eats it. She discovers that the fruit iscleaner and tastes better after it has been in the salty water. Shecontinues to wash fruit in the bay before eating. Her offspring seewhat she has done and also wash their fruit in the salty water.Soon the whole population is washing their fruit

Several turtles hatch from a clutch of eggs buried in the sandon a beach. One of the turtles is the color of the sand, the othersare darker in color. The turtles all scurry to the water, but oneby one the dark turtles are eaten by birds, only the sand coloredturtle survives. When it enters the water the sand color changes toa darker brown. The turtle grows, mates and has offspring that arealso sand colored when they are born

A female alligator gives birth to a male alligator that has theability to change color to a bright white when it is in cold water.The baby male alligator is quickly spotted by a large bird of preyand eaten

10 points

QUESTION 6

During the Beagle journey, Darwin visited islands,allowing him to compare island species with continental species. Interms of framing his theory of evolution, why was thissignificant?

Because the island species had both similarities to theircontinental ancestors and unique adaptations to their islandenvironments

Because the island species no longer shared traits with theircontinental ancestors

Because the species he saw on the islands had not changed fromtheir ancestral continental form

Because the island species had very low reproductive andsurvival rates as compared with their continental ancestors

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