The forgotten father of evolution | Sean B. Carroll

Key Concepts

• Theory of Evolution: The scientific theory that explains the diversity of life on Earth through processes like natural selection.
• Alfred Russell Wallace: A naturalist who independently conceived of the theory of evolution by natural selection.
• Charles Darwin: A naturalist who is most famously associated with the theory of evolution by natural selection.
• Natural Selection: The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
• Struggle for Existence: A concept describing the competition among organisms for limited resources, leading to differential survival and reproduction.
• Darwin Wallace Theory: The original designation for the theory of evolution by natural selection, acknowledging the contributions of both Darwin and Wallace.
• Malay Archipelago: A region in Southeast Asia where Wallace conducted extensive fieldwork.

Alfred Russell Wallace's Pivotal Role in the Theory of Evolution

While Charles Darwin is the most widely recognized figure associated with the theory of evolution, Alfred Russell Wallace played a crucial and often underappreciated role. Wallace's contributions were significant, both in terms of his intellectual insights and his immense dedication.

Wallace's Dramatic Expeditions and Discoveries

Wallace's journey to developing his ideas was marked by dramatic events. After four years in the Amazon, facing extreme hardship and nearing a breaking point, he decided to return to England with his collected specimens and nascent theories. Tragically, his ship caught fire en route, forcing him into a lifeboat. The ship sank, taking all his specimens with it, and Wallace spent 10 days adrift in an open boat before being rescued. Despite this harrowing experience, which might have deterred most from further voyages, Wallace embarked on another expedition just two years later. This time, he spent eight years exploring the Malay Archipelago, amassing tens of thousands of additional specimens. This extensive collection formed the bedrock of his evolutionary ideas.

Independent Conception of Natural Selection

By 1858, Wallace had developed a strong understanding that life evolves. He meticulously documented his thoughts in a concise paper outlining his theory of how this process worked. Recognizing a fellow naturalist with whom he had corresponded and who he believed would appreciate his work, Wallace sent his manuscript to Charles Darwin.

The "Uncanny" Parallel and the Darwin Wallace Theory

This act profoundly impacted Darwin. At the time, Darwin had not yet publicly shared his theory of evolution. He was confronted with a manuscript from a correspondent 7,000 miles away who had independently arrived at essentially the same idea. The similarity was striking, even described as "uncanny." Examination of their respective writings, including Darwin's notebooks and Wallace's draft manuscript, revealed that both described life as a "struggle for existence" using the exact same phrasing, despite no prior collaboration or knowledge of each other's specific thoughts on this aspect.

In their era, this groundbreaking concept was widely referred to as the "Darwin Wallace theory," a testament to the joint genesis of the idea. However, over time, the historical narrative shifted, with biologists and historians gradually diminishing Wallace's credit and focusing predominantly on Darwin.

Reasons for the Shift in Recognition

Several factors may have contributed to this historical shift. Darwin hailed from a wealthy family, and institutions like the University of Cambridge played a significant role in meticulously archiving and promoting Darwin's extensive collections and writings. This resulted in a more robust and accessible historical record of Darwin's work. Nevertheless, at the time of their discoveries, the theory was indeed recognized as a collaborative effort.

Conclusion: A Call for Balanced Recognition

From a contemporary scientific perspective, considering the independent and simultaneous development of the theory of natural selection by both individuals, it is argued that both Darwin and Wallace deserve equal credit for their foundational contributions to evolutionary biology.