Best answer: What is the difference between a top down effect and a bottom up effect?

What is the difference between bottom-up vs top-down control?

Top-down control can have negative effects on the surrounding ecosystem if there is a drastic change in the number of predators. … Bottom-up control in ecosystems refers to ecosystems in which the nutrient supply, productivity, and type of primary producers (plants and phytoplankton) control the ecosystem structure.

What are bottom-up effects?

The bottom-up control is driven by the presence or absence of the producers in the ecosystem. Changes in their population will affect the population of all the species in the food web, and thus, the ecosystem. … Here, lack of food has caused a decrease in the populations of higher trophic levels.

What is top-down control in an ecosystem?

In its simplest form, ‘top-down’ control refers to directional regulation within an ecosystem, where species occupying higher trophic levels exert controlling influences on species at the next lower trophic level (Terborgh et al., 1999).

Are predators regulated from the top-down?

This is called top-down regulation. Terborgh and his co-authors in Continental Conservation write, “’Top-down’ means that species occupying the highest trophic level (top carnivores) exert a controlling influence on species at the next lower level (their prey) and so forth down the trophic ladder.”

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Which is better top-down or bottom-up?

With a much more structured control, the top-down approach creates a plan faster by eliminating complex and time-consuming coordination tasks. … With bottom-up planning, one of the greatest advantages is having more realistic plans created directly with the employees involved.

What is meant by bottom-up explanation what is missing from the bottom-up explanation?

This “bottom up” explanation suggests that every trophic level is regulated by the level below it. • The bottom-up explanation did not explain why herbivore populations do not grow large enough to eat all the producers.

Is competition bottom-up or top-down?

Competitive interactions among stimuli can be influenced or biased by bottom-up processes that are based on stimulus-driven properties and top-down processes that are determined by the individual’s goals (Desimone and Duncan, 1995; Beck and Kastner, 2009).

What is a bottom-up Cascade quizlet?

bottom-up control – occurs when abundance of population is limited by nutrient supply/food availability. trophic cascade – a change in the rate of consumption at one trophic level that results in a series of changes in species abundance or composition at lower trophic levels.

What is the bottom-up view biology?

The bottom-up approach to systems biology forms detailed models from subunits of data to simulate whole systems under different physiological conditions. To develop an overview of the biological interactions occurring within an organism, various data are integrated into a larger genome-scale model.