Exam 19: Species Richness and Community Services

In south Florida, the length of time a plant species has been sold in local nurseries affects its likelihood of becoming invasive.

The idea that humans have a love of life or living systems, coined by E.O. Wilson, is known as

Resilience refers to how tolerant a community is toward a disturbance before it changes.

Lakes are strongly resilient but weakly resistant to change.

Elton suggested that species-poor island communities are much more ________ to invading species than species-rich continental communities.

According to ecomonist Robert Constanza and colleagues, community services are worth about ____% of the world's gross national product.

Experiments show increased natural enemy species richness decreases herbivore suppression because of competition between the natural enemies.

The keystone hypothesis supposes that community services

In this model, some species play a critical role in the functioning of community but other species can compensate if these are lost.

Tilman and colleagues showed that the more plant species in a prairie, the less nitrate in the rooting zone. The proposed mechanism was

A plant with a high dispersal ability, high growth rate and absence of natural enemies would probably be a successful invader?

____________ proposed a linear relationship between species richness and community services.

A corn farmer in the Midwest is plagued by corn earworms which eat his crop. However, the more species of natural enemies, such as spiders and beetles, he adds to his field, the less the damage. Which theory of species richness-community function does this support?

What is not a proposed attribute of a successfully invading species?

The reason that increased species richness increases community functioning is most often because of

According to economist Robert Constanza and colleagues, the biome with the greatest value per hectare is

If there was a steep drop in community services as soon as species richness was decreased, this would support which species-richness community service model?

Most studies relating species richness to community function support the _________ hypothesis.

Which is the odd term out?

Tilman's research in Minnesota prairies showed that high species richness promotes community stability.