Darwiniana for Darwin Day

There’s an potpourri of Darwin-related material at the Friends of Darwin Newsletter website, especially extensive because today is Darwin Day.  Click below to read it; it discusses pollination (Athayde’s favorite topic), recommends two new books, and has a bunch of evolution-related links. I’ll put those below the screenshot. Today’s newsletter was written by Richard Carter.

The “missing links” (indents are quotes from article)

Some Darwin-related articles you might find of interest:

1. The importance of Charles Darwin’s documentary archive has been recognised by its inclusion on the UNESCO International Memory of the World Register. The Darwin Archive comprises documents held at Cambridge University Library, the Natural History Museum in London, the Linnean Society of London, Darwin’s former home at Down House in Kent, the Royal Botanic Gardens at Kew, and the National Library of Scotland.
2. Podcast episode: The History of Revolutionary Ideas: Darwin.
   David Runciman talks to geneticist and science writer Adam Rutherford about the book that fundamentally altered our understanding of just about everything: Darwin’s On The Origin of Species.
3. Video: Darwin’s unexpected final obsession with earthworms.
4. Darwin Online has published Charles Darwin’s address book. Here’s their introduction, and here’s the address book.
5. The University of Edinburgh recently completed a five-year programme to catalogue, preserve, and enhance access to the Charles Lyell Collection. Geologist Lyell was a close friend of Darwin, and major influence on his work. Here’s the collection’s snazzy new website.
6. Leonard Jenyns on the variation of species and Charles Darwin on the origin of species 1844–1860
   At the 1856 meeting of the British Association for the Advancement of Science, Rev. Leonard Jenyns (1800−1893) delivered one of the most significant statements on the nature and the origin of species in the years immediately preceding Charles Darwin’s On the Origin of Species. Jenyns was a long-standing friend of Darwin and had turned down the place aboard HMS Beagle subsequently taken by Darwin.
7. The November 2025 issue of the journal Paleobiology contained a collection of papers exploring Niles Eldredge and Stephen Jay Gould’s 1972 paper on punctuated equilibria, in which they argued that species don’t always evolve through slow, steady change. Instead, the fossil record shows long periods in which species remain remarkably stable, interrupted by relatively brief bursts of evolutionary innovation linked to the origin of new species. The Paleobiology papers include a retrospective review of the importance of the idea of punctuated equilibria, and Niles Eldredge’s personal reflections.
8. Talking of brief evolutionary bursts, a recent paper finds that most living species derived from large groups which evolved in relatively short periods of time; or, as they put it, rapid radiations underlie most of the known diversity of life.
9. Talking even more of evolutionary bursts, another recent study suggests changes in solar energy fuelled high speed evolutionary changes 500-million years ago. (See also the original journal paper Orbitally‐driven nutrient pulses linked to early Cambrian periodic oxygenation and animal radiation.)
10. The case for subspecies—the neglected unit of conservation
    To lump or to split? Deciding whether an animal is a species or subspecies profoundly influences our conservation priorities. (See also my old post Lumpers v Splitters.)
11. Sexual selection in beetles leads to more rapid evolution of new species, long-term experiments show
    40 years of experiments following 200 generations of beetles show the importance of sexual selection in the emergence of new species. (See also the original journal paper: The effects of sexual selection on functional and molecular reproductive divergence during experimental evolution in seed beetles.)
12. Why did life evolve to be so colourful? Research is starting to give us some answers
    If evolution had taken a different turn, nature would be missing some colours.
13. Some of the biggest fossils Darwin sent home from the Beagle voyage were those of extinct giant ground sloths, Megatherium and Mylodon. Scientists have figured out how extinct giant ground sloths got so big and where it all went wrong.
14. Large brains and manual dexterity are both thought to have played an important role in human evolution. A new study has found that primates with longer thumbs tend to have bigger brains, suggesting the brain co-evolved with manual dexterity. (See also the original journal paper Human dexterity and brains evolved hand in hand.)
15. Thumbs and brains are all well and good, but paleoanthropologist John Hawks explores another human characteristic that remains an enduring evolutionary enigma: what the heck are chins for?

I haven’t looked at them all, but I did look at two related to my own field—speciation. I like article #10, called “In praise of subspecies,” which explains what subspecies are (they’re called “races” of plants and animals by many biologists), and  tells us how recognizing them will reduce the number of species. (This won’t satisfy all biologists, for many disagree with me that modern humans and Neanderthals are subspecies, not distinct species.) But I disagree with the author, Richard Smyth, who thinks that all subspecies should be units of conservation. That is, genetically and morphologically different populations of a species should all be conserved if they are considered “endangered”.  One should do that when possible, of course, but I feel the unit of conservation—the thing that must be saved, is the biological species. But Smyth gives a good summary of what subspecies are.

Biologists have long thought (and Allen Orr and I have a chapter on this in our book Speciation) that sexual selection promotes speciation by driving isolated populations in different directions, eventually leading to some of them becoming reproductively incompatible, through either unwillingness to mate or creating problems in hybrids. The experiments described in #11 are interesting, and show more divergence in populations of beetles that are subject to sexual selection than in those constrained to be monogamous, but they don’t show the advent of reproductive barriers between populations. They do, however, show more divergence in the sexually-selected population, which is posited to be the first step in speciation.

Remember, Darwin’s greatest book was called On the Origin of Species (a shortened title).  Yet he didn’t help us understand species very much, as he had no concept of species being groups separated by reproductive barriers. It wasn’t until the 1930s that biologists began to understand how new species originated when they realized that the key to understanding the “lumpiness” of nature—distinct species in one area—was figuring out how those groups could coexist, and that meant understanding how reproductive barriers arise. Darwin’s book would have been more appropriately titled On the Origin of Adaptations.

And that is my pronouncement for Darwin Day. I do recommend reading the first chapter of Speciation, but if you’re not an evolutionary biologist you can forget about the rest, which becomes technical at times.

xh/t: Athayde