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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
The simplest measure of community structure is a count of the number of species present and is referred to as species ________.	richness
The percentage of individuals in a community that belong to one species is called the relative ________ of that species.	relative abundance
A ________ diagram plots each species in a community, beginning with the most abundant and ending with the least abundant, along the x-axis, with the corresponding value of relative abundance on the y-axis.	A rank-abundance diagram
When a single or a few species are most prevalent in a community, the species are called ________.	dominants
A species that has a disproportionate impact on a community, relative to its abundance, is called a(n) ________ species.(En art, der har en uforholdsmæssig stor indflydelse på et samfund, i forhold til dets overflod, kaldes en (n) ________ art).	keystone
A straight-line diagram illustrating the flow of food energy from prey to predator is referred to as a food ________.	food chain.
In a food web diagram, groups of species that derive food energy from a similar source are called ________ levels.	trophic levels.
Within a community, a group of species that carries out similar functions or exploits the same resource is called a(n) ________.	guild / functional group
In a forest community, the upper layer is called the ________.	canopy. (For temperate forest: I midten - the understory, næste nederst - ground cover og nederst - forest floor). (For tropical savanna: Øverst - tree layer, midten - grass layer og nederst - soil surface). (For lake: Øverst - Photic layer, midten - aphotic layer og nederst - benthic layer).
In a forest community, the layer containing tall shrubs, small trees, and young trees is called the ________.	Understory
When an ecologist compares the diversity of different communities by counting the number of species within each community, the measure of diversity being used is called	species richness. The number of species in the community. (Species diversity involves two components: species richness and species evenness, which reflect how individuals are apportioned among the species (relative abundances).
Communities with low evenness will have rank-abundance curves	that are very steep.
The relative abundance of a tree with 100 individuals in a community of 1000 would be ( a number)	0,1
Which description is true for most communities? All species have approximately equal abundances, All species are common, All species are rare or A few species are common and the remainder are rare?	A few species are common and the remainder are rare.
The garter snake in this diagram is an example of a(n)	intermediate species. ( Rækken i et fødenet: Basal species, intermediate species og top predators).
Which of the following is considered a guild? - coniferous forest - top predators - mammals - insect-feeding birds	insect-feeding birds
Which elevational gradient has the most species?	1370-1680 m