Question

1. Which of the following demonstrates a trade-off between survival and reproduction?

a. milk hinds have higher death rates than yeld hinds, no matter what their ages

b. Flour beetle survival decreases when there are more beetles per 0.5 grams of flour

c. there is a maximum population that the environment can support, above which there is a die-off

d. Density induced stress in mice causes hormonal changes that shrink reproductive organs, decreasing birth rates

2. In the hypothesis that C. stellatus (a species of barnacle) is competitively excluded from the lower intertidal zone by B. balanoides (another species of barnacle), what could be concluded about the two species?

a. The fundamental and realized niches of B. balanoides and C. stellatus are identical.

b. The fundamental and realized niches of B. balanoides and C. stellatus are different.

c. The fundamental and realized niches of B. balanoides are different, but the fundamental and realized niches of C. stellatus are identical.

d. The fundamental and realized niches of B. balanoides are identical, but the fundamental and realized niches of C. stellatus are different.

Imagine two very similar species of lizards, which we will call species A and species B. These lizards both like to eat insects that are 10mm to 24mm long. The ranges of these species partially overlap. In the area where they are sympatric, data show that species A is eating insects that are 10mm to 15mm long, while species B is concentrating on insects that are 14mm to 24mm long. Further studies show that in areas of allopatry their jaw sizes and tongue lengths are virtually the same, but in areas of sympatry the jaw size and tongue length of species A is smaller than that of species B. This is an example of:

a. Batesian mimicry

b. resource partitioning

c. fundamental niche shrinkage.

d. Mullerian mimicry

e. character displacement

Answer 1

Felt great to answer. Good luck!