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Chapter 52

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the scientific study of the interactions between organisms and their environments.


How are the interactions that ecologists study organized?

Into different levels of biological hierarchy (global, landscape, ecosystem, community, population, and organismal.)



Biosphere- the global ecosystem

Global ecology- examines how the regional exchange of energy and materials influences the functioning and distribution of organisms across the biosphere.



Landscape - mosaic of connected ecosystems

Landscape ecology - focuses on factors controlling exchanges of energy, materials, and organisms across multiple ecosystems.



Ecosystem - community of organisms in an area and the physical factors with which those organisms interact

Ecosystem ecology - emphasizes energy flow and chemical cycling between organisms and the environment



Community- group of populations of different species in an area

Community ecology - examines how species interactions affect community structure and organization



Population - group of individuals of the same species living in an area

Population ecology - analyzes factors that affect population size and how and hey it changes through time



Concerned with how an organisms structure, philosophy, and behavior meet the challenges posed by its environment


What causes latitudinal variation on the earth?

The earths curved shape causes the tropics (regions between 23.5N and 23.5S) most directly. Higher latitudes mean the sunlight strikes the earth and an oblique angle and light energy is more diffuse on earths surface.


Explain the global air circulation

High temps in the tropics evaporate water and cause warm, wet air masses to rise and flow tower the poles. They cool and create abundant precipitation in tropical regions. The then dry air masses descend toward earth and absorb moisture, creating an arid climate among the deserts. Some of the air flows toward the poles and air masses again rise and release precipitation around 60N and 60S. The cold dry rising air flows back to the poles and then back to the equator, absorbing moisture and creating a cold climate in the polar regions.


Describe the earth's wind patterns.

air flowing close to the surface creates predictable global wind patterns; land near the equator moves faster than the poles and deflects winds, creating easterly and westerly wind flow. Cooling trade winds blow from east to west in tropics, and prevailing westerlies blow from west to east in temperate zones.


What do ecologists do?

observe nature, generate hypotheses, manipulate environmental variables, and observe outcomes.



the long term prevailing weather conditions in a given area. the four components of climate are temperature, precipitation, sunlight, and wind.


What is the most significant influence on the distribution of organisms on land and in the oceans?




Macroclimate - patterns on the global, regional, and landscape level.

Microclimate - very fine, localized patterns.


What are global climate patterns largely determined by?

the input of solar energy and Earth's movement in space (sun warms the earth and establishes temp variation, air and water movement cycles, and evaporation of water that lead to latitudinal variations)


How does the earth's annual passage around the sun affect climates?

It causes strong seasonal cycles in middle to high latitudes, effects day length, solar radiation, and temperature.


What do seasonal changes in wind patterns do to ocean currents?

they alter ocean currents and cause the upwelling of cold water from deep ocean layers. This water stimulates the growth of surface-welling phytoplankton and the organisms that fee on them. These upwelling zones make up a small percent of the ocean but are responsible for more than a quarter of fish caught globally.


Explain why the Pacific coast has a coniferous rain forest ecosystem and a large redwood grove, and why the west coast of northern Europe has a mild climate.

Cool misty climate from the cold California Current flows south along wester North America, supporting the rain forest and large redwood groves, and the Gulf Stream carries warm water from the equator to the North Atlantic, warming Europe.


In most areas, how do oceans and large lakes moderate the climate of local land?

When the land is warmer than the water, air over the land heats and rises, drawing a cool breeze from the water. When temperature drops more quickly over land than water at night, air over the warm water rises and draws school air from the land back over the water and replaces it with warm air from offshore.



In some areas (S California and SW Australia), cool ocean breezes in summer war when the contact the land, absorb moisture, and create a hot aired climate rather than cooling the land with the breeze.


How do mountains influence air flow over land?

When warm moist air approaches the mountain, the air rises and cools, releasing moisture on the windward side of the peak. On the leeward size, cool dry air descends, absorbing moisture and creating a "rain shadow" (often determines where deserts are found). Mountains also affect the amount of sunlight reaching an area, and therefor the local temp and rainfall.


Do south-facing sloper int eh Northern Hemisphere receive ore or less sunlight than north-facing slopes?

South-facing slopes receive more sunlight and are therefore warmer and drier.


How do features of the environment (abiotic features) influence microclimate?

by casting shade, altering evaporation from soil, or changing wind patterns. Open land typically experiences greater temp extremes because of greater solar radiation and wind currents. These abiotic features influence the distribution and abundance of organisms.



Abiotic - non living factors

Biotic - living factors


Any large-scale change in Earth's climate profoundly affects the _____



What is one way to predict the possible effects of future climate change?

Look at the changes in temperate regions since the last ice age. As the climate warmed, glaciers retreated, and tree distributions expanded northward. We can make predictions about how distributions will change with continued climate warming.


Why is it a concern if plants will be able to keep up with the rapid warming of the earth?

we don't know if seeds can disperse quickly enough as climate changes. Fossil pollen shows us that in the past some species with winged seeds dispersed relatively far from a tree and expanded rapidly after the ice age. Others with seeds that lack wings were delayed for thousands of years. Some plants may have smaller ranges or eventually become extinct (such as the American beech plant).


Changes in the distributions of species are proof of what?

the world warming up - organisms have shifted their ranges farther North.



major life zones characterized by vegetation type in terrestrial biomes or by the physical environment in aquatic biomes.


Why is climate a major factor in determining the locations of terrestrial biomes?

Because climate has a strong influence on the distribution of plant species



a plot of the annual mean temperature and precipitation in a particular region. Based on annular averages.


Can 2 areas with similar averages of temperature and precipitation have different climates?

Yes, climographs are based on annual averages, but the pattern of climatic variation causes areas to have different climates because some areas may receive regular precipitation throughout the year while others have distinct wet and dry seasons.


What are terrestrial biomes named for?

Their major physical or climatic features and their predominant vegetation. Biomes are also characterized by microorganisms, fungi, and animals adapted to the environments.



area of intergradation, the transition from one biome to the next


What are the layers of vegetation that many forests have?

From top to bottom; the upper canopy, the low-tree layer, the shrub understory, the ground lyre of herbaceous plants, the forest floor (little layer), and the root layer. Non-forest biomes have similar layers though less pronounced.


Why do some biomes have layers?

Layering of vegetation provides different habitats for animals.


Does the species composition of each kind of biome vary?

yes. (Ex: in the northern coniferous forest of North America, red spruce is common in the east but does not occur in most other areas, where black spruce and white spruce are abundant)



an event such as a storm, fire, or human activity that changes a community, removing organisms from it and altering resource availability. Disturbance is more common than stability in biomes.


Why are biomes often "patchy", containing several different communities in a single area?

This is a result of disturbances in the biome.


Natural wildfires being an integral component of grasslands, savannas, chaparral, and coniferous forests is an example of what?

the fact that many biomes have plants that depend on periodic disturbance.



They occur in equatorial and subequatorial regions, rainfall is relatively constant in tropical rain forests and highly seasonal in tropical dry forests, a high temp year round of 25-29C, vertically layered and intense competition for light, home to 5-30million species of insect, spiders, and other arthropods, most animal diversity of any terrestrial biome, rapid population growth of humans has lead to agriculture and development and is destroying many tropical forests.


Describe the DESERT

Occur in bands near 30N and 30S or at latitudes in the interior of continents, low precipitation and highly variable, temperature varies seasonally and daily, anywhere from -30 to 50C, low widely scattered vegetation, mostly bare ground, succulents such as cacti, deeply rooted shrubs, and herbs during infrequent moist periods, plants with reduced leaf surface area, water storage, and physical defenses such as toxins or spines, many nocturnal species, others such as snakes, lizards, scorpions, etc, animals with water conservation as an adaptation that can gt water by breaking down carbohydrates in seeds, many humans taken over exerts due to deep groundwater wells.



equatorial and subequatorial regions, seasonal rainfall with 8-9 month dry season, the savanna is warm year round, more seasonal variation that tropical forests, scattered trees with small leaves to adapt to dry conditions, fires are common, grasses, forbs grow rapidly after seasonal rains, large plant eating mammals such as zebras, predators such as lions, dominant herbivores are insects and termites, grazing mammals during droughts, earliest humans lived in savannas, cattle ranching and overhunting have led to declines in large-mammal populations.



midlatitude coastal regions, many names; chaparral in N America, matorral in Spain and Chile, garage and maquis in S France, and fynbos in S Africa. Seasonal precipitation, rainy winters, dry summers, cool fall/winter/spring (10-12C), 30-40C in summer, shrubs and small trees, greases, herbs, high plant diversity, many plants confined to small area, touch evergreen leaves to reduce water loss, adaptations to fire, browsers such as deer and goats, small mammals, amphibians, birds, reptiles, insects, heavily settled and reduced through conversion to agriculture and urbanization, humans contribute to fires.



veldts of S Africa, puszta of Hungary, pampas of Argentina and Uruguay, steppes of Russioa, plains and prairies of central N America, seasonal precipitation, dry winters, wet summers, periodic drought, -10C in winter, 30C in summer, grasses, forbs from a few cm to 2m in tall grass prairies, adaptations for periodic droughts and fire, grasses ca sprout quickly after fire, large grazers such as bison, burrowingg mammals such as prairie dogs, ideal for agriculture and growing grain, most has been converted to farmland.



broad band across northern N America and Eurasia to the edge of the arctic tundra, "taiga", largest terrestrial biome, periodic droughts, gnerally 30-70cm of rain a year, some Pacific NW are temperate rain forests that receive over 300cm of rain, cold winters (-50C), hot summers (20C), cone-bearing trees such as pine and spruce, needle-like and scale-like leaves reduce water loss, migratory birds, mammals such as moose, brown bears, etc, diverse mammals, periodic outbreaks of insects that kill lots of trees, northern coniferous forests logged at an alarming rate, old-growth stands of trees may soon disappear.



midlatitudes in N Hemisphere, smaller areas in Chile, S Africa, Australia, and New Zealand, 70-over 200cm annually, significant rain during all seasons, 0C winters, 35C humid summers, vertical layers, epiphytes, deciduous trees, evergreen eucalyptus trees in Australia, hibernating animals, migrating birds, insects, heavily settled by humans, logging and land clearing for agriculture and urban development, though the forests are returning over much of their former range.


Describe TUNDRA

expansive areas of the arctic, 20% of earth's surface, high winds, low temp, alpine tundra plant communities, 20-60cm annually in arctic tundra by over 100cm in alpine tundra, -30C winters, less than 10C summers, herbaceous vegetation, mosses, grasses, forbs, permanently frozen layer of soil called permafrost restricts the growth of plant roots, large grazing musk oxen, caribous and reindeer are migrators, predators such as bears and foxes, bir species migrate, sparsely settle by humans but is the focus of mineral and oil extraction in recent years.


How are aquatic biomes characterized?

By their physical environment


How do ecologists distinguish between freshwater and marine biomes?

on the basis of physical and chemical differences. Marine biomes have salt concentrations that average 3% and freshwater biomes have less than .1%


Do aquatic biomes have more or less latitudinal variation than terrestrial biomes?



Why do the oceans impact the biosphere so greatly?

They make up the largest marine biomes, cover about 75% of the earth's surface, and water evaporated from oceans provides most rainfall. Ocean temp has major effect on global climate and wind patterns, marine algae and photosynthetic bacteria also supply a lot of the world's oxygen and come lots of carbon dioxide.


What are freshwater biomes closely linked to?

soils and biotic components of the surrounding territorial biome



Photic- sufficient light for photosynthesis
Aphotic - lower layer, little light penetrates
Pelagic - photic and aphasic make this up
Abyssal - deep part of the aphasic zone
Benthic - made up of sand and organic and inorganic sediments, it is occupied by organisms called the BENTHOS.



Benthos - ive in benthic zone, eat dead organic matter called detritus, which "rains" down from the productive surface waters of the photic zone.



Sunlight warms surface waters but the deeper water remain cold, thermocline separates these two layers



Semiannual mixing of waters in lakes as a result of changing temperatures is a turnover. It sends oxygenated water from the surface to the bottom and brings nutrient-rich water from the bottom to the surface in spring and autumn.


How are communities distributed in freshwater and marine environments?

distributed according to water depth, degree of light penetration, distance from shore, and whether they are found in open water or near the bottom.


Species distributions are a consequence of _____ and ______

ecological and evolutionary actions through time. Survival and reproduction of individuals that lead to evolution occur in ecological time and organisms adapt to their environment over the time fare of many generations in evolutionary time.



Ecological - minute-to-minute time frame of of interactions between organisms and the environment

Evolutionary - over multiple generations


Describe LAKES

range from ponds a few square meters to lakes covering thousands of square kilometers, light decreases with depth, temperate lakes have seasonal thermocline, tropical lowland lakes have a thermocline year-round, oliogotrophic lakes and nutrient-poor and oxygen-rich, eutrophic lakes are nutrient-rich and depleted of oxygen in the deepest zone in summer and in winter if covered iwht ice,periodic oxygen depletion, oligotrophic lakes have less surface area relative to depth than eutrophic lakes, rooted and floating plants in littoral zone (shallow waters close to shore), phytoplankton in limnetic zone (further from shore), zooplankton (small drifting heterotrophs) graze on phytoplankton, fish in all zones, runoff from fertilized land.



inundated by water at least some of the time, supports plants adapted to water-saturated soil, low in dissolved oxygen, high capacity to filter dissolved nutrients and chemical pollutants, Basin wetland in shallow basins, riverine wetlands in shallow and periodically flooded banks of revers, fringe wetlands along coasts of large lakes and seas and include both freshwater and marine biomes, oat productive biomes on earth, water-saturated soils favor the growth of plants, invertebrates, birds, herbivores such as crustaceans, carnivores such as otters and dragonflies, help purify water and reduce peak flooding, draining and filling have destroyed 90% of wetlands.



high speed and volume of their flow, generally cold and swift, generally warmer where tributaries have joined, salt and nutrient content increases from headwaters to the mouth, headwaters rich in oxygen, narrow, rocky bottom, alternate depth, downstream stretches are generally wide and meandering, phytoplankton and rooted aquatic plants in areas that flow through grasslands and deserts, variety of fish, organic matter from terrestrial vegetation is primary source of food in temperate and tropical forests, agricultural and industrial pollution degrade water quality and kill organisms, damming and flood control impair natural functioning of ecosystem and threaten migratory species such as salmon.



transition area between river and sea, flows up estuary channel during rising tide and back down during falling tide, salinity varies with rise and fall of tides, among most productive biomes due to nutrients, complex network of tidal channels, islands, natural levees, mudflats, salt marsh grasses and algae, phytoplankton, worms, oysters, crabs, many fish, filling and pollution from upstream have disrupted estuaries.



periodically submerged and exposed by tides, twice daily on most marine shores, oxygen and nutrient levels generally high, high diversity and biomass of marine algae in rocky intertidal zones, vigorous wave action lack plants and algae in sandy intertidal zones, rich beds of seagrass and algae in sandy intertidal zones in protected bays or lagoons



vast realm of open blue water, constantly mixed by wind drive oceanic currents, photic zones extends to greater depths than in coastal marine waters, high oxygen levels, low nutrient concentrations, 70% earth's surface, average depth of 4000m, deepest point more than 10000m, phytoplankton that account for half of the photosynthetic activity on earth, zooplankton, free-swimming animals such as turtles, fish, marine mammals, overfishing has depleted fish stocks in earth's oceans, polluted by waste dumping



formed largely from calcium carbonate skeletons of corals, reef-building corals live in photic zone, tropical marine environments, high oxygen keels, high fresh water an nutrients levels, begins as fringing reef on young island, forms offshore barrier reef later, and a coral atoll as the older island submerges, unicellular algae, mostly corals as animals, some fish and invertebrate (high diversity), collecting of coral skeletons and overfishing have reduced populations of corals and reef fishes, global warming contributes to coral death



consists of seafloor below surface waters of the coastal (neurotic) zone and the offshore pelagic zone, water temp declines with depth, continuous cold (3C) and high water pressure, oxygen at sufficient concentrations, soft sediments, photosynthetic organisms, unique assemblages of organisms near deep-sea hydrothermal vents on mid-ocean ridges, numbers invertebrates and fish, overfishing has decimated benthic fish populations, dumping organic wastes created oxygen-deprived benthic areas.


What factors effect the distribution if a species?

Biotic and abiotic factors


A Saguaro cacti not being able to live somewhere due to the low temperature is an example of what kind or factor?



Mice that eat seedlings, preventing the saguaro cacti from growing, are an example of what kind of factor?




the movement of individuals or gametes away from their area of origin or from centers of high population density. Contributes to the global distribution of organisms


In rare cases, long distance dispersal can lead to what?

Adaptive radiation, the rapid evolution of an ancestral species into new species that fill many ecological niches.


What do ecologists use to better understand the role of dispersal in limiting the distribution of species?

Experimental methods, because opportunities to observe dispersal directly are so rare.


When is the importance of dispersal most evident?

When organisms reach an area where they did not exist previously


What must happen for a transplant of a species to be successful? If it's successful, what does this tell us?

The species must survive in the new area and reproduce there sustainably. If it is successful then we know that the potential range of the species is larger than the actual range. (Could live in areas where it currently does not)


Why do ecologists rarely move species to new geographic regions?

This can often disrupt the communities and ecosystems to which they have been introduced. Instead ecologists document the outcome when a species has bee transplanted for other purposes.


How does habitat selection behavior effect an organisms distribution?

When individuals avoid a certain habitat that is suitable, their distribution is limited because their actual range is smaller than their potential range.


How do other species limit the distribution of another species?

Negative interactions with predators that eat animals or herbivores that eat plants can prevent certain organisms from living in certain areas. Other aspects, such as the presence or absence of pollinators, food resources, parasites, pathogens, and competing organisms, can also act as a biotic limitation on species distribution.


How do abiotic factors limit species distribution?

Abiotic factors such a temperature, water, oxygen, salinity, sunlight, or soil can limit distribution. If the physical conditions at a site do not allow a species to survive and reproduce, then the species will not be found there. Organisms can avoid ozone of these stressful conditions temporarily through behaviors such as dormancy or hibernation.


Why is environmental temperature an important factor in the distribution of organisms?

Temperature effects biological processes. Cells may rupture if the water they contain freezes, and the proteins of most organisms denature at temperatures above 45C. Most organisms function best within a specific range of environmental temperature.


Why is water availability an important factor in the distribution of organisms?

Species living at the seashore or in tidal wetlands can dedicate (dry out) as the tide recedes. Terrestrial organisms face a threat of dedication, and the distribution of terrestrial organisms reflects their ability to obtain minded conserve water. Water also affects oxygen availability in aquatic environments and in flooded soils, where the slow diffusion of oxygen in water can limit cellular respiration and other physiological processes. Flooded areas may have low oxygen content, but the surface waters of streams and rivers tend to be well oxygenated because of rapid exchange of gasses with the atmosphere.


Why does salinity affect the distribution of organisms?

Salt concentration affects the water balance of organisms through osmosis. Most aquatic organisms are restricted to either freshwater or saltwater habitat.


What is one aquatic organism that has the ability to go between freshwater and saltwater? How?

The salmon migrates between freshwater streams and the ocean, they use behavioral and physiological mechanisms to osmoregulate. They balance their salt content by adjusting the amount of water they drink and by switching their gills from taking up salt in fresh water to excreting salt in the ocean.


Why does sunlight affect the distribution of organisms?

Sunlight provides the energy that drives most ecosystems, too little sunlight can limit the distribution of photosynthetic species. Too much light can limit the survival of some organisms, high light levels an increase temperature stress if the animals and plants are unable to avoid the light or unable to cool themselves through evaporation. Trees are prevented from surviving in above certain elevations because the sun's rays are more likely to damage DNA and proteins due to the thinner atmosphere that absorbs less UV radiation.


Why do rocks and soil affect the distribution of organisms?

the pH, mineral composition, and physical structure of rocks and soil limit the distribution of plats and thus of the aim ales that feed on them, contributing to the patchiness of terrestrial ecosystems. The pH of the soil can limit the distribution directly through extremely acidic or basic conditions, or indirectly by affecting the solubility of toxins and nutrients. In a river, the rocks and soil that make up the riverbed can affect water chemistry, which influences organisms.


*Which action influences the abiotic components of an organism's environment?

A) Introduction of exotics.
B) Water pollution.
C) Interactions with offspring.
D) Extinction of predators.



*Which aspects of a region's climate have the most impact on plants and animals?

A) Sunlight and wind.
B) Temperature and moisture.
C) Moisture and wind.
D) Soil composition and temperature.



*True or false? Weather is defined as the prevailing long-term atmospheric conditions in a particular region.



*Which of the following statements about Hadley cells is true?

A) As warm air rises, air at the top of the atmosphere is pushed poleward and cools.
B) Warm air expands and rises from the surface of the atmosphere around the poles.
C) Warm air begins to cool as it starts to sink at about 30° North and South latitude.
D) The moisture in cool air condenses into clouds and precipitates because cool air holds more moisture than warm air.



*Which location on Earth receives the most solar radiation per unit area?

A) 30° North and South latitude.
B) Equator
C) North Pole.
D) South Pole.



*What are rain shadows?

A) Dry regions on the windward side of mountain ranges.
B) Wet regions on the windward side of mountain ranges.
C) Wet regions on the leeward side of mountain ranges.
D) Dry regions on the leeward side of mountain ranges.



*Which desert is caused by a Hadley cell?

A) Patagonian Desert in Argentina.
B) Desert next to the Rockies.
C) Sahara Desert in Africa.
D) Atacama Desert in Chile.



*Which of the biomes—tundra, coniferous forest, temperate broadleaf forest, temperate grassland, savanna, chaparral, desert, tropical rainforest—require periodic fires to maintain their existence?

A) savanna, chaparral, temperate grassland, tundra, and coniferous forest
B) savanna and chaparral
C) savanna, desert, chaparral, temperate grassland, and temperate broadleaf forest
D) tropical forest, savanna, chaparral, temperate grassland, and coniferous forest
E) savanna, chaparral, temperate grassland, and coniferous forest



*Which of the following examples of an ecological effect leading to an evolutionary effect is most correct?

A) The insects that spend the most time exposed to sunlight have the most mutations.
B) When seeds are not plentiful, trees produce more seeds.
C) A few organisms of a larger population survive a drought and then these survivors emigrate to less arid environments.
D) Fish that swim the fastest in running water catch the most prey and more easily escape predation.
E) A few individuals with denser fur survive the coldest days of an ice age, and the reproducing survivors of the ice age all have long fur.



*Which of the following levels of ecological organization is arranged in the correct sequence from most to least inclusive?

A) ecosystem, community, population, individual
B) individual, community, population, ecosystem
C) population, ecosystem, individual, community
D) individual, population, community, ecosystem
E) community, ecosystem, individual, population



*Which of the following might be an investigation of microclimate?

A) the effect of sunlight intensity on species composition in a decaying rat carcass
B) the effect of different nitrogen applications on corn productivity
C) the seasonal population fluctuation of nurse sharks in coral reef communities
D) competitive interactions between various species of songbirds during spring migration
E) the effect of ambient temperature on the onset of caribou migration



*Which of the following choices includes all of the others in creating global terrestrial climates?

A) ocean currents
B) Earth's rotation on its axis
C) global wind patterns
D) evaporation of water from ocean surfaces
E) differential heating of Earth's surface



*Why is the climate drier on the leeward side of mountain ranges that are subjected to prevailing winds?

A) The sun illuminates the leeward side of mountain ranges at a more direct angle, converting to heat energy, which evaporates most of the water present.
B) Deserts create dry conditions on the leeward side of mountain ranges.
C) More organisms live on the sheltered, leeward side of mountain ranges where their utilization of water lowers the amount available when compared to the windward side.
D) Air masses pushed by the prevailing winds are stopped by mountain ranges and the moisture is used up in the stagnant air masses on the leeward side.
E) Pushed by the prevailing winds on the windward side, air is forced to rise, cool, condense, and drop its precipitation, leaving drier air to descend the leeward side.



*Which statement describes how climate might change if Earth was 75% land and 25% water?

A) Summers would be longer and winters shorter at midlatitude locations.
B) Terrestrial ecosystems would likely experience more precipitation.
C) Earth's daytime temperatures would be higher and nighttime temperatures lower.
D) More terrestrial microclimates would be created because of daily fluctuations in climate.
E) Earth would experience an unprecedented global warming.



*Palm trees and subtropical plants are commonplace in Land's End, England, whose latitude is the equivalent of Labrador in coastal Canada where the local flora is subarctic. Which statement best explains why this apparent anomaly exists between North America and Europe?

A) Rainfall fluctuates greatly in England; rainfall is consistently high in Labrador.
B) Labrador receives sunlight of lower duration and intensity than does Land's End.
C) Regions like Labrador are actually colder than England because colder arctic air is pulled down to eastern north American and not to England.
D) Labrador is too windy to support tall plants, such as palm trees.
E) Labrador does not get enough rainfall to support the subtropical flora found in Land's End.



*Deserts typically occur in a band around 30 degrees north and south latitude because

A) descending air masses originating from the tropics tend to be dry.
B) these locations get the most intense solar radiation of any location on Earth.
C) moisture-laden air is heavier than dry air and is not carried to these latitudes.
D) trade winds have little moisture.
E) ascending air from these regions tends to be moist, removing available water and creating a desert.



*The main reason polar regions are cooler than the equator is that

A) the polar atmosphere is thinner and contains fewer greenhouse gases.
B) sunlight strikes the poles at a lower angle.
C) the poles are permanently tilted away from the sun.
D) there is more ice at the poles.
E) the poles are farther from the sun.



*Generalized global air circulation and precipitation patterns are caused by

A) air masses that are dried and heated over continental areas that rise, cool aloft, and descend over oceanic areas followed by a return flow of moist air from ocean to land, delivering high amounts of precipitation to coastal areas.
B) polar, cool, moist high-pressure air masses from the poles that move along the surface, releasing precipitation along the way to the equator where they are heated and dried.
C) the revolution of Earth around the sun.
D) rising, warm, moist air masses that cool and release precipitation as they rise and then, at high altitude, cool and sink back to the surface as dry air masses after moving north or south of the tropics.
E) mountain ranges that deflect air masses containing variable amounts of moisture.



*Coral reefs can be found on the southeast coast of the United States but not at similar latitudes on the southwest coast. Differences in which of the following most likely account for this?

A) salinity
B) precipitation
C) day length
D) sunlight intensity
E) ocean currents



*Which of the following can be said about light in aquatic environments?

A) Photosynthetic organisms that live in deep water probably use red light.
B) Water selectively reflects and absorbs certain wavelengths of light.
C) Light penetration seldom limits the distribution of photosynthetic species.
D) Most photosynthetic organisms avoid the surface where the light is too intense.
E) Longer wavelengths penetrate to greater depths.



*Which series is correctly layered from top to bottom in a tropical rain forest?

A) canopy, emergent layer, under story, shrub/immature layer, ground layer
B) emergent trees, canopy, subcanopy, shrub and herb layer, ground layer
C) ground layer, shrub/immature layer, under story, canopy, emergent layer
D) canopy, under story, shrub/immature layer, emergent layer, ground layer
E) emergent trees, subcanopy, canopy, ground layer, shrub and herb layer



*What is the limiting factor for the growth of trees in the tundra?

A) insufficient minerals in bedrock
B) low precipitation
C) permafrost
D) pH of soils
E) lack of sunlight


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*Which climograph shows the climate for location 2?



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*Which zone produces the most global oxygen?




*Which marine zone has the lowest rates of primary productivity (photosynthesis)?

A) neritic
B) continental shelf
C) intertidal
D) pelagic
E) abyssal


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*What does the left y-axis show?

A) sea surface temperature anomaly, in degrees Celsius
B) sea surface temperature, in degrees Celsius
C) sea surface temperature anomaly, in degrees Fahrenheit
D) time, in four-year intervals
E) incidence of cholera, as a percentage of the normal rate


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*What does the red graph line represent?

A) sea surface temperature
B) incidence of cholera
C) time, in four-year intervals
D) cholera mortality rate


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*In which of the following years did the incidence of cholera reach its lowest level?

A) 1981
B) 1987
C) 1988
D) 1989
E) 1993


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*In which of the following years was the sea surface temperature more than 1ºC above the average temperature?
Select all that apply.

A) 1983
B) 1987
C) 1988
D) 1991
E) 1997

A, B, E

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*Which of the following statements is supported by the data in the graph?

A) There is a negative correlation between sea surface temperature and the incidence of cholera.
B) An increase in sea surface temperature causes the incidence of cholera to increase.
C) There is a positive correlation between sea surface temperature and the incidence of cholera.
D) There is no relationship between sea surface temperature and the incidence of cholera.


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*Is this statement supported or not supported by the data on the graph?
As global warming causes sea surface temperatures to increase in the future, the incidence of cholera in Bangladesh will also increase.

A) supported
B) not supported
C) cannot be determined from the graph



*In which of the following terrestrial biome pairs are both parts dependent upon periodic burning?

A) chaparral and savanna
B) grassland and tundra
C) desert and savanna
D) tundra and coniferous forest
E) tropical forest and temperate broadleaf forest



*In which community would organisms most likely have adaptations enabling them to respond to different photoperiods?

A) tropical forest
B) temperate forest
C) savanna
D) coral reef
E) abyssal



*Which of the following statements best describes the effect of climate on biome distribution?

A) Seasonal fluctuation of temperature is not a limiting factor in biome distribution if areas have the same annual temperature and precipitation means.
B) Not only is the average climate important in determining biome distribution but so is the pattern of climatic variation.
C) Average annual temperature and precipitation are sufficient to predict which biome will be found in an area.
D) Temperate forests and grasslands are different biomes because they receive a different quality and quantity of sunlight, even though they have essentially the same annual temperature and precipitation.
E) Correlation of climate with biome distribution is sufficient to determine the cause of biome patterns.



*The oceans affect the biosphere in all of the following ways except

A) removing carbon dioxide from the atmosphere.
B) being the source of most of Earth's rainfall.
C) moderating the climate of terrestrial biomes.
D) producing a substantial amount of the biosphere's oxygen.
E) regulating the pH of freshwater biomes and terrestrial groundwater.


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*What does the red line on the graph represent?

A) month of the year
B) average precipitation (inches)
C) average precipitation (mm)
D) average temperature (°F)
E) average temperature (°C)


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*What do the blue bars on the graph represent?

A) average yearly temperature
B) yearly precipitation
C) average monthly temperature
D) monthly precipitation


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*Which two months have the highest average temperature?

A) May and June
B) July and August
C) September and October


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*What is the best description of the yearly temperature range shown by this graph?

A) Winters are cold and summers are hot.
B) Temperatures are very cold throughout the year.
C) Winters are mild and summers are hot.
D) Temperatures are mild throughout the year.
E) Winters are cold and summers are cool.


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*What is the best description of the pattern of precipitation shown by this graph?

A) Precipitation is greatest in the winter and spring.
B) Precipitation is greatest in the spring and summer.
C) Precipitation is greatest in the summer and fall.
D) Precipitation is greatest in the fall and winter.


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*What is the best estimate of the total yearly precipitation in the region represented by this graph?

A) 75 mm
B) 75 inches
C) 500 mm
D) 900 mm
E) 900 inches
F) cannot be determined from this graph


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*What biome does this climatograph represent?

A) desert
B) tropical savanna
C) tundra
D) temperate deciduous forest
E) temperate grassland


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