Exam 4: Populations and Communities

Which one of the following is a trait that increases the chances of survival for an endangered species?

A stable population would remain at equilibrium if

Brown-headed Cowbirds lay their eggs in other birds' nests,relying upon another species to raise their chicks.Although many species continue to raise the cowbird chicks,some species reject the eggs and offspring.Further,Brown-headed Cowbirds are rare inside large forests.Which of the following represents an adaptation in response to this cowbird threat?

Walking through a national park,you step off a well-marked trail to take a photograph and accidentally trample a rare orchid.This is an example of

In an ecosystem with many similar species,we typically find

Which of the following organisms is most likely a K-strategist?

Adaptation takes place in response to

New genetic traits upon which natural selection can act usually arise from

Controlling the Spotted Knapweed reveals

Rabbits in Australia

Dung beetles live in regions where cattle graze,quickly burying and recycling cattle droppings.Because of the dung beetle's activities,breeding habitats and resources for disease-carrying flies are reduced and the plants upon which cattle feed are nourished. -The relationship between the dung beetles and the disease-carrying flies is a type of

The different Galápagos finch species

Which of the following represents a type of top-down regulation for rattlesnakes living in Arizona?

Kudzu vine,chestnut blight,fire ants,and Japanese beetles are all examples of

In North America,a toxic weed called leafy spurge was accidentally introduced and has grown and spread rapidly,covering millions of acres in north central United States and south central Canada.Leafy spurge is generally avoided by cattle and horses and may be toxic to them.Thus,rangeland where leafy spurge has spread has been damaged by the invasion of this plant. -Plants such as leafy spurge can double their population size every year in part because of their efficient production of large amounts of seeds.Populations that can double every year,such as leafy spurge,

Introduced alien species that cause the most harm are those that

The relationships among elk predators represent

It is common to hear about the huge reproductive potential of some organisms.Perhaps someone has mentioned that if all of the eggs of houseflies were to survive to maturity,the world would soon be covered in flies.This does not happen because,in reality,

A population of catfish in a muddy pond reaches its maximum size as the food supplies start to run low.Without any new sources of food,the catfish population remains steady.This population represents

Which of the following represents a type of top-down regulation for wildflowers living in a forest?