Chapter 7 section 2

One charastristic of a comunity ? Its? A related measure is? Which means? Species diversity suggests that?

Species richness the number of species it contains species eveness wjhich relates the number of species in the comunity relative abundance of each each species richness is a simplec ounthe of the spew

Species richness varies with? Its? As a general rule? Species richness is greatest in? Why are there more in tropics? This stability allowed species? Another hypothesis?

Latitude distance from the equator the closerr to the equator the more species it wiill contain tropical rain forsts temprature habitats are younger having formed since the last ice age therfor tropicals were not distiirbiuted by the ice ages While habitats farthor north were and also the climate is more stable in tropics This stability alowed species to specialize to a greater deggre than they could in temprate regions where the temp is more variable

Beacuse plants photsynthesie year around in the tropics there i more energy avialiable to support more organismsms

E.x of birds? What are biologically the richest habitats on earth?

The areasd that are cold have 0 -100 spceis while tha areas that are tropics and closer to the equator have way more reaching 600+

Equtaoral rain forestst

Another pattren of species richness is? This relationship is called? Species area effect is more prown to? Why? In the caribian for example? The size changes by? Why deos species richness increase with increasing area?

That larger areas usually ciontain more species than smaller areas do, species area effect

Islands beacuse area is clearly limited by geography

More amphibians and reptiles live on large islands such as cuba but on small islands such as redonda which only has 5 species and cuba nad hispaniola has about 100

The shorline changes and the enroaching of the humanpopulation making houses

Larger areas USUALLY CONTAIN GREATER DIVERSITY of habitats thus can support more species

The increasing in human population destroys about how much of the tropical rainforests per a year? The destruction of the habitats result in?

2 percent, extinction of species

Species interactions and species richness

Interactions amoung species somtimes promotes?Studoes has SHown that?

When the seas star pisaster was REMOVED?

Species richness

Predators can provent competitive exclusing from ocuring among their prey

The musuls crowded out many of the other competing species in the area predation by the sea star on the mussle promoted divesrsity by controlling the superior competetor the mussel

Comunity stability

One of the most important charastristics of a comunity is how it responds, the stabiklity of a comunity ?For many years ecologistst agreed that? They stated? One line of evidence?

species interation such as ….. can promote species richness

species richness imroves a comunities stability

to disturbances

Indicates its resistance to change, stability was DIRECTLY RELARED TO SPECIES RICHNESS

Comunities with more spcies would have more links between other species these links would in a sense disperse the effect of disturbances and prevent distruption of the comunity

Vulnerbiulioty of argicultural fields which usually contain one species of crop plants to outbreak os insect pestst