You observe beavers cutting down trees to create a dam along a stream. The dam slows down the flow of water, creating a new wetland behind the dam. From this you can conclude that beavers are:

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Consider what the beavers are doing in the scenario: they modify the environment by building a dam, which alters water flow and creates a new wetland habitat behind the dam.
Option 1: 'Not very important in their habitats' This underestimates the impact beavers have on their surroundings; the damming activity clearly changes physical conditions and habitats, indicating they are quite influential.
Option 2: 'Keystone species' The term keystone species refers to a species that has a disproportionately large effect on its ecosystem relative to its abundance. While beavers do fit this idea in practice, the more precise ecological classification from the described behavior emphasizes the physical modification of the environment rather than focusing on the global role of a single species in maintaining community structure. This option is close but not the most direct fit for the given description, which centers on the engineering role.
Option 3: 'Dominant species' A dominant species is typically the most abundant or ecologically influential because of numerical superiority or strong competitive abilities. The beavers’ role here is not about being the most numerous or winning through competition; it is about engineering habitat rather than sheer abundance or dominance.
Option 4: 'Ecosystem engineers' This choice captures the essence of the observed behavior: beavers actively modify the physical environment (water flow, wetland formation), creating new habitats for themselves and other species. This concept specifically names organisms that alter ecosystems in ways that create or transform habitats.
In sum, the scenario emphasizes the beavers’ capacity to physically alter the environment to generate a new wetland, which aligns with the definition of ecosystem engineers. The other options either mischaracterize the nature of their impact or rely on broader, less precise labels. Remember, highlighting environmental modification as a mechanism is a direct way to identify ecosystem engineers in ecology.

SP25 ZOOLOGY 101 001 Lecture Review Quiz 12

You observe beavers cutting down trees to create a dam along a stream. The dam slows down the flow of water, creating a new wetland behind the dam. From this you can conclude that beavers are:

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