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Understanding Ecosystems: From Biomes to Marine and Freshwater Environments

Ecosystems encompass all living and non-living elements in an area. They are influenced by biotic factors, like plants and animals, and abiotic factors, such as soil and water. Biomes, defined geographic areas, host diverse ecosystems, including temperate forests, tropical rainforests, grasslands, deserts, and tundras. Marine and freshwater ecosystems showcase the importance of aquatic life. Understanding these interconnected systems is crucial, as they face threats like habitat destruction and climate change, impacting biodiversity and global health.

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Understanding Ecosystems: From Biomes to Marine and Freshwater Environments

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  1. Environmental Chapter 3 Ecosystems

  2. Ecosystems • An ecosystem is all of the living and non-living things in a given area • 2 factors – • Biotic – all of the living things in an environment – ex. Insects, mice, plants • Abiotic – physical factors in an environment – ex. Soil, air, water

  3. Biomes • A geographic area characterized by certain types of plants and animals • A biome contains even smaller ecosystems ex. Rainforest biome contains tree-top ecosystems, river ecosystems etc.

  4. Forest Biomes • Develop where there is ample rainfall and moderate temperatures • Three types • Temperate deciduous forests • Coniferous forests • Rain forests

  5. Temperate Deciduous Forest Biome • Leaves change and fall every year • We live in this biome • Fairly broad leaves to absorb sun • Average rainfall 75-125 cm • Average temperature • Summer: 28 ºC • Winter: 6ºC

  6. Coniferous Forest • Not much change between summer and winter • Consists mainly of evergreen trees which have waxy needles to prevent water loss • Seeds in cones • Not a lot of plants grow in the under story because of limited light • Average rainfall 35-75 cm • Average temperature • Summer: 14°C • Winter: -10° C

  7. Tropical Rain Forest • Most biologically diverse • Most animals live in the canopy • Soil nutrient poor • Rain forest quickly disappearing through farming and clear-cutting, and development • Average rainfall up to 400cm • Average temperature • Daytime:34°C • Nighttime: 20°C

  8. Rainforest Destruction • Decrease in the world’s oxygen • Increase in the world’s carbon dioxide • Can lead to global warming • Loss of species • Loss of medicines

  9. Temperate Grasslands • Grasses and some flowering plants • Seed-eating mammals and herbivores • Biomass is manly underground, deep roots – this allows plants to live through grazing and fires • Many fires • Average rainfall 25-75cm • Average temperature • Summer 30°C • Winter 0°C

  10. Savannas • Tropical grasslands • Clumps of trees • Deep roots • Fluctuate between rainy season and drought • Average rainfall 150 cm • Average temperature • Dry season: 34°C • Wet season: 16°C

  11. Deserts • Plants are succulent and grow far apart to avoid competition for water • Most animals are nocturnal to avoid heat from sun • Many animals have ways of conserving water and cooling themselves • Average rainfall less than 25cm • Temperature can vary greatly between night and day • Average temperature • Summer: 38°C • Winter: 7°C

  12. Tundra • No trees because cannot make deep roots • Permafrost - frozen soil • Soggy area because of poor drainage • Average rainfall 30-50 cm • Average temperature • Summer: 12°C • Winter: -26°C

  13. Marine Ecosystems • Salty water • Almost 75% of the earth is covered in salt water • Phytoplankton are the most abundant producers (perform photosynthesis) • Zooplankton feed on phytoplankton • Both phytoplankton and zooplankton for the base of the ocean’s food web • Ocean is divided into zones

  14. Marine Zones • Intertidal – where ocean meets land. For part of the day, this zone is above water • Neritic zone – water is less than 200m deep. Plants and phytoplankton live here.

  15. Oceanic – deep water zone • 0-200m is zone where photosynthesis takes place • Benthic – ocean bottom

  16. Estuaries • Place where fresh water from streams and rivers flows into oceans

  17. Freshwater Ecosystems • No salt • A tributary is a smaller stream that meets with other tributaries to form bigger streams • Rivers are where streams meet

  18. Moving Freshwater • Fast moving – steep, towards top of mountains, younger • Animals have adaptations to avoid being swept away: grow on or under rocks etc

  19. Slow moving - less steep, towards bottom of mountain, meanders (curves), older • Biotic material and sediment deposit on the bottom forming “deltas” • Eventually water flows into oceans

  20. Still Waters • Ponds and lakes • Three zones • Littoral zone – closest to land, plants, snails, larvae • Open-water zone – extends from littoral zone and goes as deep as the light will reach, bass, trout, phytoplankton • Deep-water zone – no light, beneath open water, catfish, fungus, feed on dead stuff that falls from above

  21. Wetlands • Water level is near or above the surface of the ground • Absorb water during heavy rains • Help replenish the water supply

  22. Marshes • Treeless wetlands

  23. Swamp • Wetlands where trees and vines grow • Low-lying areas besides slow-moving rivers • Flooded only part of the year

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