Trophic Interactions
Trophic Interactions - Related Videos
01:35
Trophic Levels
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2025
All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers. Food Chains Within an ecosystem, energy and nutrients flow through organisms in a sequential order known as a food chain. Each organism occupies a trophic level or a specific place...
00:46
Trophic Efficiency
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2025
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain. Trophic Level Transfer Efficiency Following the second law of thermodynamics, large amounts of energy are lost from the ecosystem and from one...
12:24
Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout (Salvelinus namaycush) from Its Prey
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Cited by 1 •
2014
A technique for laboratory estimation of net trophic transfer efficiency of polychlorinated biphenyl (PCB) congeners to piscivorous fish from their prey is presented. To maximize applicability of the laboratory results to the field, the piscivorous fish should be fed prey fish that are typically eaten in the field.
02:26
A Co-culture Method to Model Neuron-Oligodendrocyte Interactions
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2025
This video demonstrates the establishment of a co-culture of human induced neurons (iNs) and induced oligodendrocyte precursor cells (iOPCs). iNs are mixed with iOPCs in a co-culture and then incubated to support the maturation of both iNs into neurons and iOPCs into oligodendrocytes. Neurons form synaptic connections with other neurons and oligodendrocytes, while oligodendrocytes develop myelin sheaths around the neurons' axons.
11:14
Fatty Acid 13C Isotopologue Profiling Provides Insight into Trophic Carbon Transfer and Lipid Metabolism of Invertebrate Consumers
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Cited by 6 •
2018
The fatty acid trophic marker approach, i.e., the assimilation of fatty acids as entire molecule and transfer into consumer tissue with no or minor modification, is hampered by knowledge gaps in fatty acid metabolism of small soil invertebrates. Isotopologue profiling is provided as a valuable tool to disentangle trophic interactions.
FAQs
Top-down control occurs when consumers influence organisms at lower trophic levels, while resource limitation occurs when available food or nutrients constrain populations. These opposing influences can shape population sizes and community structure. Comparing them helps explain why a change in predators, producers, or nutrient availability may alter several connected parts of an ecosystem.
Food-web links connect energy transfer and nutrient movement across multiple consumer and producer levels. If one population increases or declines, organisms that depend on it may gain or lose resources, while its own food sources may experience the reverse pressure. Such cascading effects can change biodiversity, community structure, and environmental stability.
Decomposers process organic matter after organisms produce waste or die, returning nutrients to soil or water. This recycling supports the nutrient supply available within the ecosystem and links the breakdown of biological material to future production. Their activity therefore connects feeding relationships with the continued functioning and stability of environmental systems.
Researchers can examine food chains and food webs to determine how strongly organisms depend on one another and how changes at one level propagate through the community. Observing population sizes, community structure, and environmental stability after disturbance provides evidence about an ecosystem’s capacity to withstand or respond to change.
Mapping an invasive species within existing feeding relationships can show whether it affects producers, consumers, predators, or decomposers. Researchers can then consider possible changes in population sizes and cascading effects across the food web. This approach helps connect the presence of an invader with broader consequences for biodiversity and community structure.
Habitat change can modify the organisms and feeding links present in an ecosystem, potentially disrupting pathways of energy and nutrient transfer. Examining which producers, consumers, predators, and decomposers remain helps researchers anticipate changes in food-web structure. The resulting analysis can clarify consequences for biodiversity, environmental stability, and ecosystem resilience.