Presentation on theme: "Preview Section 1 Land Biomes Section 2 Marine Ecosystems"— Presentation transcript:
1 Preview Section 1 Land Biomes Section 2 Marine Ecosystems The Earth’s EcosystemsPreviewSection 1 Land BiomesSection 2 Marine EcosystemsSection 3 Freshwater EcosystemsConcept Mapping
2 Bellringer • What is a biome? • List seven land biomes. Section 1 Land BiomesBellringer• What is a biome?• List seven land biomes.Write your answers in your science journal.
3 Section 1 Land BiomesObjectivesDistinguish between abiotic factors and biotic factors in biomes.Identify seven land biomes on Earth.
4 The Earth’s Land Biomes Section 1 Land BiomesThe Earth’s Land BiomesAbiotic Factors Abiotic factors are the nonliving parts of an environment.Biotic Factors Biotic factors are the living parts of an environment.Biomes A biome is a large area characterized by its climate and the plants and animals that live in the area.
16 Section 1 Land BiomesTundraPolar Tundra In polar tundra, the layer of soil beneath the surface soil stays frozen all of the time. This layer is called permafrost.Alpine Tundra Alpine tundra also has permafrost. But alpine tundra is found at the top of tall mountains.
18 Bellringer What are some abiotic factors in marine ecosystems? Section 2 Marine EcosystemsBellringerWhat are some abiotic factors in marine ecosystems?Are these abiotic factors different from the abioticfactors in land biomes?Record your responses in your science journal.
19 Objectives List three abiotic factors that shape marine ecosystems. Section 2 Marine EcosystemsObjectivesList three abiotic factors that shape marine ecosystems.Describe four major ocean zones.Describe five marine ecosystems.
20 Section 2 Marine Ecosystems Life in the OceanAbiotic Factors Marine ecosystems are shaped by abiotic factors including water temperature, water depth, and the amount of sunlight that passes into the water.Plankton Trillions of plankton live in the ocean. Plankton are tiny organisms that float near the surface of the water.
21 Section 2 Marine Ecosystems TemperatureDepth and Temperature The temperature of ocean water decreases as the depth of the water increases.
22 Section 2 Marine Ecosystems Depth and SunlightThe Intertidal Zone The intertidal zone is the place where the ocean meets the land.The Neritic Zone As you move farther away from shore, into the neritic zone, the water becomes deeper.The Oceanic Zone In the oceanic zone, the sea floor drops sharplyThe Benthic Zone The benthic zone is the ocean floor. The deepest part does not get any sunlight.
25 Section 2 Marine Ecosystems A Closer LookIntertidal Areas Intertidal areas are found near the shore. These areas include mudflats, sandy beaches, and rocky shores.Coral Reefs Coral reefs are found in warm, shallow areas of the neritic zone. Reefs provide homes for many marine animals and plants.Estuaries An area where fresh water from rivers spills into the ocean is called an estuary. Plants and animals living in estuaries must be able to survive in a changing concentration of salt.
26 A Closer Look, continued Section 2 Marine EcosystemsA Closer Look, continuedThe Sargasso Sea An ecosystem called the Sargasso Sea is found in the middle of the Atlantic Ocean. The ecosystem contains floating rafts of algae.Polar Ice The Arctic Ocean and the ocean around Antarctica have icy waters, which are rich in nutrients. Many fishes, birds, and mammals live in this ecosystem.
27 Section 3 Freshwater Ecosystems BellringerCan you think of four different freshwater ecosystems? Which of these ecosystems are similar to a marine ecosystem or a land biome?Record your answers in your science journal.
28 Section 3 Freshwater Ecosystems ObjectivesDescribe one abiotic factor that affects freshwater ecosystems.Describe the three zones of a lake.Describe two wetland ecosystems.Explain how a lake becomes a forest.
29 Stream and River Ecosystems Section 3 Freshwater EcosystemsStream and River EcosystemsWater in Streams and Rivers The water in brooks, streams, and rivers may flow from melting ice or snow. Or the water may come from a spring.Tributaries Each stream of water that joins a larger stream is called a tributary.
31 Tributary, River System, and Drainage Basin Section 3 Freshwater EcosystemsTributary, River System, and Drainage BasinClick below to watch the Visual Concept.Visual Concept
32 Pond and Lake Ecosystems Section 3 Freshwater EcosystemsPond and Lake EcosystemsLife near Shore The are of water closest to the edge of a lake or pond is called the littoral zone. The plants in the littoral zone are homes to small animals.Life Away from Shore The area of a lake or pond that extends from the littoral zone across the top of the water called the open-water zone. Beneath the open-water zone is the deep-water zone, where no sunlight reaches.
34 Section 3 Freshwater Ecosystems Wetland EcosystemsMarshes A treeless wetland ecosystem where plants, such as grasses, grow is called a marsh. Muskrats, turtles, frogs, and birds live in marshes.Swamps A wetland ecosystem in which trees and vines grow is called a swamp. Water lilies and other plants grow in standing water. Many fishes, snakes, and birds also live in swamps.
35 Section 3 Freshwater Ecosystems From a Lake to a ForestBuild Up of Sediments Water entering a standing body of water usually carries nutrients and sediments. These materials build up on the bottom of the lake or pond.Formation of a Wetland Over time, the pond or lake is filled with sediments. Plants grow in the new soil and the pond or lake starts becoming a wetland. The wetland then may develop into a forest.
36 The Earth’s Ecosystems Concept MappingUse the terms below to complete the concept map on the next slide.land biomes marinebiotic factors freshwaterTundra abiotic factorsbiomes grasslands