Tackling invasive species on land improves sea ecosystem too

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It is found that removing invasive species and restoring island ecosystems on land can have significant benefits.

A blue-footed booby sitting on a rock in Floreana Island, in the Galapagos Islands in the Pacific Ocean, 900km off the Ecuadorean coast. Ecuador has put in place a plan to try and protect its unique wild bird species on those islands. Photo: AFP

They found that removing invasive species and restoring island ecosystems on land can also have significant benefits to underwater environments. “Carefully chosen conservation actions on islands can lead to really stunning changes in the neighbouring ocean ecosystem, because everything is connected,” she said.

But seabird populations across the world have plummeted, with the introduction on islands of non-native mammals – like rats that plunder nests to eat eggs and hatchlings – by human activity driving some bird species to local or global extinction. The island, which is almost entirely a national park, eradicated invasive pigs in the 1980s in a bid to save the critically endangered seabird the Galapagos petrel, and then in 2019 non-native goats were removed, leading to a regrowth in local vegetation.Once they are gone, at least a dozen species that went locally extinct largely because of invasive species will be returned to the island, including giant tortoises and mockingbirds.

 

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