In a grassland ecosystem, scientists manipulate the nutrient levels in the soil. They observe that increasing soil nutrients leads to a significant increase in the abundance of grass species. This, in turn, supports a larger population of herbivores, which subsequently attracts more predators. What type of control is described in this scenario and why?  Group of answer choices Bottom-up control: Increased nutrient levels enhance primary production, which supports higher herbivore and predator populations Bottom-up control: Increased predator populations reduce herbivore numbers, which leads to a decrease in primary production Top-down control: Predator abundance directly affects primary production by influencing herbivore populations Top-down control: Herbivores increase due to higher grass abundance, which in turn affects predator populations

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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In a grassland ecosystem, scientists manipulate the nutrient levels in the soil. They observe that increasing soil nutrients leads to a significant increase in the abundance of grass species. This, in turn, supports a larger population of herbivores, which subsequently attracts more predators.

What type of control is described in this scenario and why? 

Group of answer choices
Bottom-up control: Increased nutrient levels enhance primary production, which supports higher herbivore and predator populations
Bottom-up control: Increased predator populations reduce herbivore numbers, which leads to a decrease in primary production
Top-down control: Predator abundance directly affects primary production by influencing herbivore populations
Top-down control: Herbivores increase due to higher grass abundance, which in turn affects predator populations
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