Exam 11: Competition and Coexistence

Parasites of one species of fly which makes galls on the seaside plant sea-oxeye daisy, can spill over and reduce the densities of galls on a neighboring plant, Jesuit's bark. This is an example of:

What organism appeared in the Mobile area of the U.S. in 1918 and has since spread throughout the U.S. South?

A group of species that feed on the same resource, in the same way, is known as a

Theoretically, for one limiting resource, the species with the highest R* should displace all the others from the habitat.

Resource partitioning ___________ interspecific competition.

Which is NOT a recognized hypothesis to account for the strong competitive ability of invasives?

Proportional similarity values of <0.70 have been taken to indicate possible coexistence.

Richard Southwood and others suggested species cannot coexist if d/w is

The tendency for two species to diverge in size of body parts associated with feeding is called

Chthamalus stellatus and Semibalanus balanoides do not coexist in the same tidal zones because

If K₂>K₁/ $\alpha$ 1F10 and K₂ / $\beta$ > K₁, then

In competition between P. caudatum and P. bursaria, neither species goes extinct. This is because they don't utilize the same resource. This conclusion is generalized as the

In competition experiments between the flour beetles T. castaneum , T. confusum and T. castaneum won mostly in_______, ________conditions.

Two species of lizards, the canyon lizard, Sceloporus merriarni, and the tree lizard, Urosaurus ornatus both hunt for insect prey on rock surfaces. In 1976, an experimenter established removal plots, where one species of lizard was removed. Here are the resultant densities of lizards: Urosaurus with Sceloporus 55, Urosaurus alone 80, Sceloporus with Urosaurus 130, Sceloporus alone 129. What can you conclude?

On Anticosti island, black bears have been outcompeted by

In competition between the freshwater diatoms Asterionella and Synedra, Synedra reduces the silicate concentration to lower levels than Asterionella and thus outcompetes it.

Allelopathy involves interference competition.

Park's experiments showed the results of competition could vary as a function of

In a plant competition experiment between two closely related species Desmodium glutinosum and D. nudiflorum, average growth of individuals in given in parentheses: Desmodium glutinosum grown alone (130 cm), grown within in 10 cm of large D. glutinosum individuals (25 cm), or within 10 cm of large D.nudiflorum individuals (45 cm). Desmodium nudiflorum grown alone (25 cm), within in 10 cm of large D. nudiflorum (15 cm) or within 10 cm of D. glutinosum (5 cm). What can you conclude?

Invasive Grey squirrels are outcompeting red squirrels in Britain because...