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But Dr O'Sullivan said there was clearly more to super donors than keystone species.
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Elephants are a keystone species, environmental engineers who play irreplaceable roles in maintaining ecological integrity.
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The local evolution of foundation or keystone species can create ecological patterns where none existed originally.
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He said super donors' stools tended to have high levels of specific " keystone species".
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Aspens are keystone species in boreal forests that produce condensed tannins to serve as chemical defense.
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Rare microbes may therefore be overlooked keystone species regulating the functioning of host-associated, terrestrial and aquatic environments.
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The region supported a prosperous commercial fishing industry, but overfishing depleted the northern Benguela's keystone species, the sardine.
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Beavers are a " keystone species", meaning they provide more important ecosystem services than their numbers alone would suggest.
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No people and 20 times more elephants would restore them as the undisputed keystone species in a patchwork mosaic African landscape.
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They are a keystone species, which means that they have a larger influence in the ecosystem than their numbers alone would suggest.
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Even if a species is particularly resistant to these changes, the downfall of a keystone species could bring its whole ecosystem crashing down.