Continuing Saga

The island birds that helped shape Charles Darwin's theory of evolution are giving scientists new insights into how natural selection works

06-01-2007 // Sharon Levy
 

The Continuuing Saga of the Galapagos Finches magazine layout - finch on branch

CHARLES DARWIN believed that natural selection was far too slow to be observed in the wild. But for the past three decades, the same small Galápagos birds that inspired Darwin to form his revolutionary theory have been revealing that the process works with surprising speed. Scientists can, and do, watch evolution in action—a development that would have boggled the English naturalist’s mind.

In 1835, as he traveled through the Galápagos, the 25-year-old Darwin saw a multitude of little birds. He prepared specimens to bring back to England, assuming he was collecting Galápagos varieties of the warblers, sparrows and finches found on the South American mainland. Many months later, John Gould, an ornithologist studying Darwin’s bird skins at the Zoological Society of London, informed him that instead he had found 14 new species—every single one of them a finch, every single one found only in the Galápagos.

When he published a memoir of his voyage, Darwin wrote that in the ground finches of the Galápagos, “a nearly perfect gradation may be traced, from a beak extraordinarily thick, to one so fine, that it may be compared to that of a warbler. . . . Seeing this gradation and diversity of structure in one small, intimately related group of birds, one might really fancy that, from an original paucity of birds in this archipelago, one species had been taken and modified for different ends.” That text was the first published hint of Darwin’s theory of evolution by natural selection. It was not only the finches that pushed Darwin’s thinking in this new direction. Every living thing he collected in the Galápagos, from the iguanas to the cacti, were radically different from their cousins on the mainland. In closing his memoir of the islands, he wrote: “Hence, in both space and time, we seem to be brought somewhat near to that great fact—that mystery of mysteries—the first appearance of new beings on this earth.” His experience had set him off on the quest that would consume him for the rest of his life: the struggle to understand how new species come into being.

 

The Continuuing Saga of the Galapagos Finches magazine layout - black finch on yellow flower

 

Today, the quest continues. On Daphne Major—one of the most desolate of the Galápagos Islands, an uninhabited volcanic cone where cacti and shrubs seldom grow higher than a researcher’s knee—Peter and Rosemary Grant have spent more than three decades watching Darwin’s finches respond to the challenges of storms, drought and competition for food. Biologists at Princeton University, the Grants know and recognize many of the individual birds on the island and can trace the birds’ lineages back through time. They have witnessed Darwin’s principle in action again and again, over many generations of finches.

The Grants’ most dramatic insights have come from watching the evolving bill of the medium ground finch. The plumage of this sparrow-sized bird ranges from dull brown to jet black. At first glance, it may not seem particularly striking, but among scientists who study evolutionary biology, the medium ground finch is a superstar. Its bill is a middling example in the array of shapes and sizes found among Galápagos finches: heftier than that of the small ground finch, which specializes in eating small, soft seeds, but petite compared to that of the large ground finch, an expert at cracking and devouring big, hard seeds.

When the Grants began their study in the 1970s, only two species of finch lived on Daphne Major, the medium ground finch and the cactus finch. The island is so small that the researchers were able to count and catalogue every bird. When a severe drought hit in 1977, the birds soon devoured the last of the small, easily eaten seeds. Smaller members of the medium ground finch population, lacking the bill strength to crack large seeds, died out.

Bill and body size are inherited traits, and the next generation had a high proportion of big-billed individuals. The Grants had documented natural selection at work—the same process that, over many millennia, directed the evolution of the Galápagos’ 14 unique finch species, all descended from a common ancestor that reached the islands a few million years ago.

Eight years later, heavy rains brought by an El Niño transformed the normally meager vegetation on Daphne Major. Vines and other plants that in most years struggle for survival suddenly flourished, choking out the plants that provide large seeds to the finches. Small seeds came to dominate the food supply, and big birds with big bills died out at a higher rate than smaller ones.

“Natural selection is observable,” Rosemary Grant says. “It happens when the environment changes. When local conditions reverse themselves, so does the direction of adaptation.”

Recently, the Grants witnessed another form of natural selection acting on the medium ground finch: competition from bigger, stronger cousins. In 1982, a third finch, the large ground finch, came to live on Daphne Major. The stout bills of these birds resemble the business end of a crescent wrench. Their arrival was the first such colonization recorded on the Galápagos in nearly a century of scientific observation. “We realized,” Peter Grant says, “we had a very unusual and potentially important event to follow.” For 20 years, the large ground finch coexisted with the medium ground finch, which shared the supply of large seeds with its bigger-billed relative. Then, in 2002 and 2003, another drought struck. None of the birds nested that year, and many died out. Medium ground finches with large bills, crowded out of feeding areas by the more powerful large ground finches, were hit particularly hard.

When wetter weather returned in 2004, and the finches nested again, the new generation of the medium ground finch was dominated by smaller birds with smaller bills, able to survive on smaller seeds. This situation, says Peter Grant, marked the first time that biologists have been able to follow the complete process of an evolutionary change due to competition between species and the strongest response to natural selection that he had seen in 33 years of tracking Galápagos finches.

On the inhabited island of Santa Cruz, just south of Daphne Major, Andrew Hendry of McGill University and Jeffrey Podos of the University of Massachusetts at Amherst have discovered a new, man-made twist in finch evolution. Their study focused on birds living near the Academy Bay research station, on the fringe of the town of Puerto Ayora. The human population of the area has been growing fast—from 900 people in 1974 to 9,582 in 2001. “Today Puerto Ayora is full of hotels and mai tai bars,” Hendry says. “People have taken this extremely arid place and tried to turn it into a Caribbean resort.”

 

The Continuuing Saga of the Galapagos Finches magazine layout - finch on green branch

 

Academy Bay records dating back to the early 1960s show that medium ground finches captured there had either small or large bills. Very few of the birds had mid-size bills. The finches appeared to be in the early stages of a new adaptive radiation: If the trend continued, the medium ground finch on Santa Cruz could split into two distinct subspecies, specializing in different types of seeds. But in the late 1960s and early 70s, medium ground finches with medium-sized bills began to thrive at Academy Bay along with small and large-billed birds. The booming human population had introduced new food sources, including exotic plants and bird feeding stations stocked with rice. Billsize, once critical to the finches’ survival, no longer made any difference. “Now an intermediate bill can do fine,” Hendry says.

At a control site distant from Puerto Ayora, and relatively untouched by humans, the medium ground finch population remains split between large- and small-billed birds. On undisturbed parts of Santa Cruz, there is no ecological niche for a middling medium ground finch, and the birds continue to diversify. In town, though there are still many finches, once-distinct populations are merging.

The finches of Santa Cruz demonstrate a subtle process in which human meddling can stop evolution in its tracks, ending the formation of new species. In a time when global biodiversity continues its downhill slide, Darwin’s finches have yet another unexpected lesson to teach. “If we hope to regain some of the diversity that’s already been lost,” Hendry says, “we need to protect not just existing creatures, but also the processes that drive the origin of new species.”

Based in Humboldt County, California, Sharon Levy is a regular contributor to National Wildlife, OnEarth, BioScience and other magazines.

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