Karl Fedorovich Kessler (19 November 1815 – 3 March 1881) was a German-Russian

zoologist Zoology ()The pronunciation of zoology as is usually regarded as nonstandard, though it is not uncommon. is the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habits, and d ...

and author of zoological

taxa In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ...

signed ''Kessler'', who was mostly active in

Kyiv Kyiv, also spelled Kiev, is the capital and most populous city of Ukraine. It is in north-central Ukraine along the Dnieper River. As of 1 January 2021, its population was 2,962,180, making Kyiv the seventh-most populous city in Europe. Kyi ...

, Ukraine. He conducted most of his studies of birds in Ukrainian regions of the

Russian Empire The Russian Empire was an empire and the final period of the Russian monarchy from 1721 to 1917, ruling across large parts of Eurasia. It succeeded the Tsardom of Russia following the Treaty of Nystad, which ended the Great Northern War. T ...

Kiev Governorate Kiev Governorate, r=Kievskaya guberniya; uk, Київська губернія, Kyivska huberniia (, ) was an administrative division of the Russian Empire from 1796 to 1919 and the Ukrainian Soviet Socialist Republic from 1919 to 1925. It wa ...

, Volyn Governorate,

Kherson Governorate The Kherson Governorate (1802–1922; russian: Херсонская губерния, translit.: ''Khersonskaya guberniya''; uk, Херсонська губернія, translit=Khersonska huberniia), was an administrative territorial unit (als ...

Poltava Governorate The Poltava Governorate (russian: Полтавская губерния, Poltavskaya guberniya; ua, Полтавська Губернія, translit=Poltavska huberniia) or Poltavshchyna was a Governorate (Russia), gubernia (also called a provin ...

and

Bessarabia Bessarabia (; Gagauz: ''Besarabiya''; Romanian: ''Basarabia''; Ukrainian: ''Бессара́бія'') is a historical region in Eastern Europe, bounded by the Dniester river on the east and the Prut river on the west. About two thirds o ...

. He also studied the fish of the

Dniester The Dniester, ; rus, Дне́стр, links=1, Dnéstr, ˈdⁿʲestr; ro, Nistru; grc, Τύρᾱς, Tyrās, ; la, Tyrās, la, Danaster, label=none, ) ( ,) is a transboundary river in Eastern Europe. It runs first through Ukraine and th ...

Dnieper } The Dnieper () or Dnipro (); , ; . is one of the major transboundary rivers of Europe, rising in the Valdai Hills near Smolensk, Russia, before flowing through Belarus and Ukraine to the Black Sea. It is the longest river of Ukraine an ...

, and

Southern Bug , ''Pivdennyi Buh'' , name_etymology = , image = Sunset S Bug Vinnitsa 2007 G1.jpg , image_size = 270 , image_caption = Southern Bug River in the vicinity of Vinnytsia, Ukraine , map = PietinisBug ...

rivers, and on the Ukrainian coast of the

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Ro ...

. Kessler was one of the first zoologists to propose that mutual aid, rather than mutual struggle, was the main factor in the

evolution Evolution is change in the heredity, heritable Phenotypic trait, characteristics of biological populations over successive generations. These characteristics are the Gene expression, expressions of genes, which are passed on from parent to ...

of a species. The anarchist

Peter Kropotkin Pyotr Alexeyevich Kropotkin (; russian: link=no, Пётр Алексе́евич Кропо́ткин ; 9 December 1842 – 8 February 1921) was a Russian anarchist, socialist, revolutionary, historian, scientist, philosopher, and activist ...

later developed this theory in his book '' Mutual Aid: A Factor of Evolution''.

Tribute

The Kessler's gudgeon ''(Romanogobio kesslerii)'' was named after him.

References

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1815 births 1881 deaths 19th-century zoologists from the Russian Empire Corresponding members of the Saint Petersburg Academy of Sciences Biologists from the Russian Empire Evolutionary biologists People from the Russian Empire of German descent Rectors of Saint Petersburg State University Ukrainian ichthyologists Ukrainian ornithologists Ukrainian zoologists Privy Councillor (Russian Empire) {{Russia-scientist-stub

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See also

References

External link