Revisiting the Galápagos Islands today is HEART BREAKING.

Invasive species have overtaken the cliffs of San Cristóbal Island in the Galapagos and threaten to eradicate native species. That this tragedy is unfolding in the place that first opened our eyes to the fundamental understanding of how species evolve is especially tragic.

Losing Native Species in the Galápagos.

San Cristóbal  is the oldest and fourth largest of the Galápagos Islands. It has one of the only permanent sources of fresh water in the archipelago and is home to uniquely adapted species for its unforgiving island conditions.

San Cristóbal is an oasis where life converges – red-footed boobies (Sula sula), blue-footed boobies (Sula nebouxii), and Nazca boobies (Sula granti) share a nesting ground, where American flamingo (Phoenicopterus ruber) and scores of other shore birds come to breed.

San Cristóbal was the first island Charles Darwin visited on his famous Beagle voyage. Today, it is barely recognizable.

Sadly, San Cristóbal Island has now become the story of isolation shattered and biodiversity threatened. Over time, the remoteness that created ideal conditions to witness evolution on a human scale has been terribly compromised by the encroachment of agriculture, development, and tourism, and with them, non-native  species. 

Breeding Grounds invaded, trampled, ambushed.

Introduced species crowd and trample native species. Today, the spread of guayaba, blackberry bushes, feral goats, horses, cattle, pigs, cats, rats, and dogs has decimated many of the islands native and endemic species. If left unchecked, the loss of biodiversity will be irreversible. 

Living in the shadows of the more famous Galápagos finches, tortoises, and sea lions, the Galápagos petrels are losing their struggle for survival in relative obscurity. Already, their numbers have declined by 80 percent. As a result, in 1994 they joined the growing list of species designated as Critically Endangered on the IUCN Red List.

Soon, they could be added to the growing list of extinctions, marking even this iconic location as another place that is not immune to loss of biodiversity. They are not alone, San Cristóbal has already lost its eponymous Flycatcher (Pyrocephalus dubius) and currently hosts 13 other species of endangered plants, mammals, and birds.

The petrels spend most of their time at sea foraging for fish and crustaceans. However, during the breeding season, they return to their the humid highlands of San Cristóbal looking for nesting sites

They now arrive to a landscape increasingly inhospitable. And increasingly unrecognizable, with invasive blackberry bushes obscuring their nesting burrows and cavities. In addition, they confront non-native predators waiting to prey on them – black and brown rats devour their eggscats and dogs ambush the adults. Further compounding the problem is nest destruction by goats, donkeys, cattle, and horses.

What We Are Doing To Help

The Bottom Line

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Photo Credits:

  1. Scalesia pedunculata: Haplochromis [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)]

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