Aquatic Ecosystems - Socorro Independent School District
Aquatic Ecosystems How do we describe aquatic ecosystems? Aquatic Ecosystems Aquatic ecosystems are primarily determined by the ecosystems salinity. Salinity refers to the dissolved salt content of the water. Aquatic ecosystems are divided into freshwater and marine ecosystems. Freshwater ecosystems have a very low salt content. Marine ecosystems have a very high salt content.
Note that organisms adapted to one type of aquatic ecosystem often cannot survive in the other ecosystem type. Freshwater Ecosystems Several factors determine the organisms that dwell within the water. Temperature Sunlight Oxygen Nutrients Soils and minerals
Example: sunlight only penetrates water to a certain depth, so photosynthetic organisms are restricted to a certain water depth. Freshwater Ecosystems Plankton are organisms that cannot swim against currents. As such, they are called drifters. Phytoplankton are
drifting algae, and serve as the food base for the ecosystem. Freshwater Ecosystems Zooplankton are drifting animals. They may be microscopic, but do not have to be. Jellyfish are a good example. Decomposers are also
found in aquatic ecosystems. Freshwater Ecosystems Nekton are freeswimming animals. These organisms can freely oppose the waters current. Benthos are bottom-dwellers, which means they inhabit the floor or
anchor to hard surfaces. Lakes and Ponds Lakes and ponds are separated into three zones: The littoral zone, located around the shore. Here, life is both diverse and abundant. Cattails, reeds and lilies are common plants in this zone. The limnetic zone is found in the shallow open water farther away from the shore. Since the water is often too deep to support rooted plants, phytoplankton is the primary food base. The benthic zone is the very bottom of the lake or pond. Its mostly inhabited by bottom dwellers
and decomposers. Lakes and Ponds Eutrophication is any increase in the amount of nutrients in the ecosystem. As you know, this is not really a good thing for the ecosystem. The excessive influx of nutrients causes algal blooms, which choke out local organisms. Additionally, the growth of algae and other producers brings with it an expansion in the number of bacteria and other decomposers. This uses up most of the dissolved oxygen. Freshwater Wetlands
Wetlands are terrestrial regions that are covered with fresh water for a large part of the year. Marshes are populated by non-woody plants (i.e., cattails). Swamps are populated by woody plant (i.e., cypress and other trees). Wetlands perform
several important roles in nature: 1. They filter pollutants from the water. 2. They control flooding by absorbing excess overflow. 3. Fish use these lands for food and breeding. 4. Carbon dioxide can be trapped here. Human Effects Humans have drained and developed a large number of wetlands.
For example, the Everglades have been reduced from 8 million acres to 2 million acres today. The resulting loss of wetland habitats has led to increased pressure on wildlife populations. Also, the loss of wetlands has made several areas of the world more vulnerable to flooding, which can cause damage to life and property. River Systems Rivers can form from springs, melting snow, or converging streams. At the headwaters, the river is typically cold, oxygenated, and narrow and quick.
Further downstream, the river becomes warmer, wider, slower, and deoxygenated. Vegetation is more frequent here. Vegetation and animals adapt to the different parts of the river. For example, trout are good swimmers, and are found in the rapids. Catfish are frequently found in the slower waters. Exit Ticket 1. 2. 3.
4. Why are phytoplankton not found in deep water? Which of the three zones of a lake has the greatest variety of vegetation? How can eutrophication damage ecosystems? What are some negative consequences of removing wetlands? Marine Ecosystems Marine ecosystems contain salt water. There are three different types: Coastal Wetlands
Coral Reefs Open Ocean All three of these marine ecosystems have their own unique characteristics. Coastal Wetlands Much like freshwater wetlands, coastal wetlands are terrestrial areas that are flooded some or all of the time. The only difference is that salt water is used instead of freshwater. Just like freshwater wetlands, coastal wetlands guard against flooding, filter pollutants and minerals, and provide food
and shelter to wildlife. Coastal Wetlands Estuaries are regions where fresh and salt water mix. Often, this occurs when a river meets the ocean. When this occurs, mixing currents from the river and ocean trap mud and nutrients, sinking them to the bottom. As a result, estuaries are often quite lush and productive. Producers can make great use of these nutrients. Coastal Wetlands
Due to the high level of nutrients and sunlight, estuaries can support a wide variety of living organisms. Drifters: Phytoplankton, zooplankton Nekton: Dolphins, manatees, otters, fish Benthos: Oysters, barnacles and clams Organisms that live in estuaries often must be able to tolerate a wide range of saline levels, due to the variable salt content of the estuarys water. Coastal Wetlands Much like
freshwater wetlands, estuaries have been developed for human use. Landfills are a common human use for estuary development. Estuaries are also used as harbors or port areas. Tokyo
New York Shanghai Buenos Aires Rio de Janeiro Bombay Coastal Wetlands Salt marshes are filled with mineral-rich mud, deposited due to the mixing currents within an estuary. Mangrove swamps are comprised of
mangroves, which are well adapted to shallow salt water. They are found in swampy regions in the tropics and subtropics. Barrier islands are formed from sand deposits away from the shore. They function as vital breakwaters, protecting the mainland from flooding. Coral Reefs Coral reefs are limestone ridges. They are formed by coral polyps and algae. The polyps secrete limestone frames and skeletons, which accumulate over time to form the reef. These corals can only exist in warm salt water with abundant light (for photosynthesis). Many are found in the
Pacific and Indian Oceans, as well as the Caribbean. Corals shelter fish, snails, anemones, sponges, and many other organisms. Coral Reefs Coral reefs are quite sensitive to environmental flux. Either sudden or gradual changes in the water temperature, mineral and nutrient content, and overall health will kill off the algae found in
the coral reef. This leads to coral bleaching the sudden whitening of the corals. If the algae is not replaced, then the ecosystem will die. Also, pollutants like waste and oil slicks cause damage to these ecosystems. Note that coral reefs grow slowly, so ecological damage is repaired slowly, if at all. Oceans As open ocean is quite harsh, this is one of the least productive biomes of all. Water scatters light, and sunlight for photosynthesis only penetrates about 100m. Phytoplankton is restricted to this depth. The vast majority of ocean lifeforms exist in
shallow coastal water. This is due to the scattering of light, and because shallow water is close enough to land to support plant life. Oceans The deep ocean and ocean floor are very dark. Most food here is dead organisms that fall from the surface waters. Decomposers, filter feeders and other predators are the primary lifeforms here. Chemosynthetic organisms also live here. These are organisms that make their own food from chemical reactions.
Oceans Oceans face several man-made threats: Added pollution from land can kill off organisms in the ocean. Pollutants include runoff, waste, fertilizers and sewage. Overfishing damages the food web by removing vital links in the ecosystem. Overwarming and acidification of the ocean can also eliminate organisms that cant adapt to changing environmental conditions. Exit Ticket 1. 2.
3. 4. Why are estuaries so diverse and productive? What are some negative side effects of the removal of estuaries? Why are coral reefs so easily harmed and damaged? The deep ocean has little, if any, light. Without light for producers, how can any organisms exist in this region?
Read the Introduction to Oedipus Rex, section "The Legend and the Play" (first 2 pages only!) Get one laptop for you and your partner and go to www.mrcjun.weebly.com. Post a response to the 1/30 blog question: According to Bernard Knox,...
To set up an access code and login information contact Kylie McLarty at Max Preps. Her email address is: [email protected] Please thoroughly review the notes section of the presentation. Many slides have case plays, actual rules book language and teaching...
Packed tower air stripping is commonly used to remove volatile contaminates ( e.g., tetrachloroethylene, trichloroethylene, benzene, ammonia) from contaminated waters. Increasingly, it is being applied to the renovation of groundwaters that have become contaminated with volatile organic carbon ...
25.0 cm3 of an unknown acid, HA, is exactly neutralised by 15.0 cm3 of 0.50 mol dm-3sodium hydroxide. Calculate the concentration of the acid solution, HA. Challenge Question. The concentration of HA in g dm-3 is 10.95 g dm-3 ....
Gives students an overview of the main issues to consider when writing a paper and provides advice on how to approach the process. ... Locate and access the required information and data. ... contact the Equality and Diversity Team in...
Tempe Center for the Arts Art Inquiry Activities by Mary Erickson, Ph.D., with Arizona artist Denise Yaghmourian When we inquire, we ask questions to help us solve a problem or explore an object or event in depth.