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An Introduction to Ecology
An Introduction to Ecology

... Commensalism – One species benefits and the other is not affected Parasitism – One species benefits and the other is harmed (parasite & host) ...
Tuning the ecoscope
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... trigger huge variability in pelagic fish recruitment success (Roy et al. 2001). In upwelling systems, a small number of pelagic fish species occupy the intermediate trophic level, feeding mostly on phytoplankton and/or zooplankton. These species can attain huge biomasses, which can vary radically de ...
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... How does the science of ecology analyze the interactions of organisms with one another and their environment and describe and quantify the dynamic nature of living systems? ...
Ecosystem Scavenger Hunt
Ecosystem Scavenger Hunt

...  Coral Reefs- formed by massive colonies containing billions of tiny coral animals called Polyps. Polyps secrete a stony substance called Calcium Carbonate around them for protection. When the corals die, their empty outer skeletons form layers which cause the reefs to grow. They are found in coast ...
Ecosystem Pyramid - Effingham County Schools
Ecosystem Pyramid - Effingham County Schools

... Energy Flow in Ecosystems ❧ Ultimate source of energy = sun ❧ Plants, algae, & some bacteria capture solar energy - perform photosynthesis ❧ Organelle that performs photosynthesis = chloroplast (pigment inside = chlorophyll) ...
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... When the living populations of organisms interact with their nonliving or physical environment they make up an 3)________________________. If a group of ecosystems have the same climate and dominant plant communities they are a 4)_______________________, such as grassland, tropical forest, deciduous ...
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Ecosystems
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... producers at the base and top carnivores at the tip". ...
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... How to interpret a food web What are trophic levels Be able to identify if an organism is a producer, primary consumer, secondary What are the 3 kinds of Ecological Pyramids & how to interpret them How much energy is lost from one trophic level to the next? Define and give examples of biotic and abi ...
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... determine water flows Sustainable management demands regeneration of stocks in space and time Managing ecosystems implies managing water resources Ecosystem services have high values which are not accounted for in GDP Ecosystem degradation affects poor directly and has an insufficiently recognized s ...
The Role of Squid in Pelagic Marine Ecosystems
The Role of Squid in Pelagic Marine Ecosystems

... cephalopods, especially large squid, in pelagic marine ecosystems. The workshop is to be held at the Imin Conference Center of the University of Hawaii at Manoa on Tuesday through Friday, November 14-17, 2006. The workshop will convene jointly with the annual PFRP Principal Investigators (PI) meetin ...
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... And nutrients or other factors limiting producers can still increase producer biomass and have effects that propagate up the food web Both Top-down and Bottom-Up controls influence abundance and productivity of populations ...
Science Study Guide: Ecosystems and Adaptations
Science Study Guide: Ecosystems and Adaptations

...  During a drought, the available resources of a habitat will decrease.  In a food chain there are both producers and consumers. If the number of consumers increases, the number of producers will decrease. An example would be if the rabbits in a community increased, the number of plants and grasses ...
What is meant by the “Circle of Life”?
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... All living things are interdependent on one another! What happens If insecticide Is sprayed? ...
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Ecosystem



An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system. These biotic and abiotic components are regarded as linked together through nutrient cycles and energy flows. As ecosystems are defined by the network of interactions among organisms, and between organisms and their environment, they can be of any size but usually encompass specific, limited spaces (although some scientists say that the entire planet is an ecosystem).Energy, water, nitrogen and soil minerals are other essential abiotic components of an ecosystem. The energy that flows through ecosystems is obtained primarily from the sun. It generally enters the system through photosynthesis, a process that also captures carbon from the atmosphere. By feeding on plants and on one another, animals play an important role in the movement of matter and energy through the system. They also influence the quantity of plant and microbial biomass present. By breaking down dead organic matter, decomposers release carbon back to the atmosphere and facilitate nutrient cycling by converting nutrients stored in dead biomass back to a form that can be readily used by plants and other microbes.Ecosystems are controlled both by external and internal factors. External factors such as climate, the parent material which forms the soil and topography, control the overall structure of an ecosystem and the way things work within it, but are not themselves influenced by the ecosystem. Other external factors include time and potential biota. Ecosystems are dynamic entities—invariably, they are subject to periodic disturbances and are in the process of recovering from some past disturbance. Ecosystems in similar environments that are located in different parts of the world can have very different characteristics simply because they contain different species. The introduction of non-native species can cause substantial shifts in ecosystem function. Internal factors not only control ecosystem processes but are also controlled by them and are often subject to feedback loops. While the resource inputs are generally controlled by external processes like climate and parent material, the availability of these resources within the ecosystem is controlled by internal factors like decomposition, root competition or shading. Other internal factors include disturbance, succession and the types of species present. Although humans exist and operate within ecosystems, their cumulative effects are large enough to influence external factors like climate.Biodiversity affects ecosystem function, as do the processes of disturbance and succession. Ecosystems provide a variety of goods and services upon which people depend; the principles of ecosystem management suggest that rather than managing individual species, natural resources should be managed at the level of the ecosystem itself. Classifying ecosystems into ecologically homogeneous units is an important step towards effective ecosystem management, but there is no single, agreed-upon way to do this.
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