Henry Walter Bates

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For other people named Henry Bates, see Henry Bates (disambiguation).

Henry Walter Bates
Linnaean Society, and of the Royal Society
Scientific career
FieldsMimicry, natural history, geography
InstitutionsRoyal Geographical Society, London

Henry Walter Bates

FGS (8 February 1825 in Leicester – 16 February 1892 in London) was an English naturalist and explorer who gave the first scientific account of mimicry in animals. He was most famous for his expedition to the rainforests of the Amazon with Alfred Russel Wallace, starting in 1848. Wallace returned in 1852, but lost his collection on the return voyage when his ship caught fire. When Bates arrived home in 1859 after a full eleven years, he had sent back over 14,712 species (mostly of insects) of which 8,000 were (according to Bates, but see Van Wyhe[1]) new to science.[2] Bates wrote up his findings in his best-known work, The Naturalist on the River Amazons
.

Life

Bates was born in

Mechanics' Institute (which had a library), studied in his spare time and collected insects in Charnwood Forest. In 1843 he had a short paper on beetles published in the journal Zoologist.[3]

He became friends with Wallace when the latter took a teaching post in the Leicester Collegiate School. Wallace also became a keen

Robert Chambers), which put evolution into everyday discussion amongst literate folk. They also read William H. Edwards's Voyage Up the River Amazons on his Amazon expedition,[4] and this started them thinking that a visit to the region would be exciting, and might launch their careers.[5]

The great adventure

In 1847 Wallace and Bates discussed the idea of an expedition to the Amazon rainforest, the plan being to cover expenses by sending specimens back to London. There an agent would sell them for a commission. (The often repeated statement that the main purpose was for the travellers to "gather facts towards solving the problem of the origin of species", and that Wallace put this in a letter to Bates, is almost certainly a myth, originating in a convenient adjustment of history by Bates in The Naturalist on the River Amazons of 1863.[6]) The two friends, who were both by now experienced amateur entomologists, met in London to prepare themselves. They did this by viewing South American plants and animals in the main collections.[7] Also they collected "wants lists" of the desires of museums and collectors. All known letters exchanged between Wallace and Bates are available in Wallace Letters Online.

curl-crested toucans
"

Bates and Wallace sailed from

Upper Amazon (Solimões). Tefé was his base camp for four and a half years. His health eventually deteriorated and he returned to Britain in 1859, after spending nearly eleven years on the Amazon. He sent his collection on three different ships to avoid the fate of his colleague Wallace, who lost his entire collection when his ship sank. Bates spent the next three years writing his account of the trip, The Naturalist on the River Amazons
, widely regarded as one of the finest reports of natural history travels.

Home at last

In 1863 he married Sarah Ann Mason.

Entomological Society of London. In 1871 he was elected a fellow of the Linnaean Society, and in 1881 he was elected a fellow of the Royal Society
.

He died of bronchitis in 1892 (in modern terms, that may mean emphysema). A large part of his collections are in the Natural History Museum (see The Field, London, 20 February 1892). Specimens he collected went to the Natural History Museum, at that time called the British Museum (Natural History), and to private collectors; yet Bates still retained a huge reference collection and was often consulted on difficult identifications. This, and the disposal of the collection after his death, are mentioned in Edward Clodd's Memories.[9]

Wallace wrote an obituary of Bates in

Heliconiidae butterflies as "remarkable and epoch-making", with "a clear and intelligible explanation", briefly addressing its attackers as "persons who are more or less ignorant of the facts". He then praises Bates's contributions to entomology, before regretting, in remarkably bitter words for an official obituary, that the "confinement and constant strain" of "mere drudgery of office work" for the Royal Geographical Society had with "little doubt ... weakened his constitution and shortened a valuable life".[10]

His work

Plate from Bates' 1862 paper "Contributions to an insect fauna of the Amazon Valley: Heliconiidae"

Henry Bates was one of a group of outstanding naturalist-explorers who were supporters of the theory of evolution by natural selection (Charles Darwin and Alfred Russel Wallace 1858).[11] Other members of this group included Joseph Dalton Hooker, Fritz Müller, Richard Spruce and Thomas Henry Huxley.

Bates' work on Amazonian

hover-fly, many of which – though bearing no sting – mimic the warning colouration of hymenoptera (wasps and bees). Such mimicry does not need to be perfect to improve the survival of the palatable species.[13]

Bates' grave in East Finchley Cemetery

Bates noted of the Heliconids (long-wings) that they were forest dwellers which were:

1. abundant 2. conspicuous and slow-flying. 3. gregarious; and also 4. the adults frequented flowers. 5. the larvae fed together.

And yet, said Bates "I never saw the flocks of slow-flying Heliconidae in the woods persecuted by birds or dragonflies ... nor when at rest did they appear to be molested by lizards, or predacious flies of the family Asilidae [robber-flies] which were very often seen pouncing on butterflies of other families. ... In contrast, the Pieridae (sulfur butterflies), to which Leptalis belongs [now called Dismorphia] are much persecuted."

Bates observed that many Heliconid species are accompanied by other species (Pierids), which mimic them, and often cannot be distinguished from them in flight. They fly in the same parts of the forest as the model (Heliconid) and often in company with them. Local races of the model are accompanied by corresponding races or species of the mimic. So a scarce, edible species takes on the appearance of an abundant, noxious species. Predators, Bates supposed, learn to avoid the noxious species, and a degree of protection covers the edible species, no doubt proportional to its degree of likeness to the model. These testable hypotheses about warning signals and mimicry helped to create the field of evolutionary ecology.[14]

Bates, Wallace and Müller believed that Batesian and Müllerian mimicry provided evidence for the action of natural selection, a view which is now standard amongst biologists.[15] Field and experimental work on these ideas continues to this day; the topic connects strongly to speciation, genetics and development.[16]

Ega

Bates spent the best part of a year at Ega (now

Solimões),[17] where he reported that turtle was eaten regularly, and insect catches were especially abundant. He found upwards of 7,000 species of insects in the area, including 550 distinct species of butterfly.[18] Bates nursed a sick toucan back to health. Tocáno (the Indian name, after its cries) proved to be an intelligent and amusing companion, with a voracious appetite. Mainly a fruit eater, he learnt the meal times "to a nicety", and would eat flesh and fish as well as fruit.[19]

Taxonomy

Bates' original work was done on a group of conspicuous butterflies always spelled by Bates as Heliconidae. He divided this assemblage into two groups, the Danaoid Heliconids, having affinities with the tribe

milkweed plant supplies poisonous glycosides which render both caterpillar and adult danaines noxious. Ithomiines, in contrast gain their toxicity from their adult nectar sources. Heliconiine caterpillars feed on poisonous Passiflora
vines. However, ithomiines gain their toxicity from their adult food plants.

Legacy

Henry Walter Bates is commemorated in the scientific name of a species of South American boa, Corallus batesii [20] and in the name of his theory of mimicry, Batesian mimicry.

Notes

  1. ^ Van Wyhe J. (2014) "A Delicate Adjustment: Wallace and Bates on the Amazon and 'The Problem of the Origin of Species'" Journal of the History of Biology 47: 627-659
  2. ^ Clodd, in Bates H.W. 1892. The Naturalist on the River Amazons, With a Memoir of the Author by Edward Clodd. Murray, London. pxvii
  3. ^ Bates, H.W. (1843). "Notes on Coleopterous insects frequenting damp places". The Zoologist. 1: 114–5.
  4. ^ Edwards, W.H. Voyage Up the River Amazons, Including a Residence at Pará. London, 1847.
  5. ^ Moon H.P. 1976. Henry Walter Bates FRS 1825–1892: Explorer, Scientist and Darwinian. Leicestershire Museums, Leicester.
  6. ^ Van Wyhe J. (2014) "A Delicate Adjustment: Wallace and Bates on the Amazon and 'The Problem of the Origin of Species'" Journal of the History of Biology 47: 627-659
  7. ^ Bates H.W. 1863. The Naturalist on the River Amazons. 2 vols, Murray, London. Preface
  8. ^ Crawforth, Anthony (2009). The Butterfly Hunter: The Life of Henry Walter Bates. Buckingham, England: University of Buckingham Press.
  9. ^ Clodd, Edward (1916). Memories. London: Chapman & Hall.
  10. doi:10.1038/045398c0
    .
  11. doi:10.1111/j.1096-3642.1858.tb02500.x
    .
  12. ^ Carpenter GDH and Ford EB 1933. Mimicry. Methuen, London.
  13. ^ Wickler W. 1968. Mimicry in Plants and Animals. World University Library, London.
  14. ^ Ruxton GD, Sherratt TN and Speed MP 2004. Avoiding Attack: The Evolutionary Ecology of Crypsis, Warning Signals and Mimicry. Oxford.
  15. ^ Moon H.P. 1976. Henry Walter Bates FRS 1825–1892: Explorer, Scientist and Darwinian. Leicestershire Museums, Leicester.
  16. doi:10.1046/j.1420-9101.2001.00342.x
    .
  17. ^ Ega/Tefé is on the smaller tributary Tefé, nearly opposite the junction of the large tributary Japurá with the main Amazon.
  18. ^ Bates H.W. 1892. The Naturalist on the River Amazons, With a Memoir of the Author by Edward Clodd. Murray, London. Chapters 10–12, esp. p. 349–353.
  19. ^ Bates 1892, p. 350.
  20. ISBN 978-1-4214-0135-5
    . ("Bates, H. W.", p. 19).

References

Before Bates

  • Edwards W.H. 1847. Voyage Up the River Amazons, Including a Residence at Pará. London. (the book that sparked Wallace and Bates to travel to the Amazon; scanned copy of US edition at Cornell University Library website)

By Bates

About Bates

Further reading

External links

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