Johannes Iversen was a Danish palaeoecologist and plant ecologist. He was born in Sønderborg

Sønderborg

Sønderborg Municipality , is a municipality in Region of Southern Denmark partially on the Jutland peninsula and partially on the island of Als in south Denmark, at the border with Germany. The municipality covers an area of , and has a total population of 76,236...

 and began studies in botany at the University of Copenhagen

University of Copenhagen

The University of Copenhagen is the oldest and largest university and research institution in Denmark. Founded in 1479, it has more than 37,000 students, the majority of whom are female , and more than 7,000 employees. The university has several campuses located in and around Copenhagen, with the...

 in 1923 under professor C.H. Ostenfeld

Carl Hansen Ostenfeld

Carl Emil Hansen Ostenfeld was a Danish systematic botanist. He graduated from the University of Copenhagen under professor Eugenius Warming. He was a keeper at the Botanical Museum 1900-1918, when he became professor of botany at the Royal Veterinary and Agricultural College...

, and with considerable inspiration from prof.em. Christen Raunkiær. At first he worked with macrophyte vegetation of lakes in relation to water pH. The influence from Raunkiær is particularly evident in Iversen‘s doctoral thesis, in which he divided herbaceous plants into hydrotypes based on experiments and morphological studies: xerophytes, mesophytes, hygrophytes, telmatophytes, amphiphytes and limnophytes. In addition, halobio-types (salt tolerance) were described. He brilliantly used modern equivalents in the interpretation of pollen diagrams, e.g. his now classic studies on frost damage to ivy

Ivy

Ivy, plural ivies is a genus of 12–15 species of evergreen climbing or ground-creeping woody plants in the family Araliaceae, native to western, central and southern Europe, Macaronesia, northwestern Africa and across central-southern Asia east to Japan and Taiwan.-Description:On level ground they...

 (Hedera) and holly

Holly

Ilex) is a genus of 400 to 600 species of flowering plants in the family Aquifoliaceae, and the only living genus in that family. The species are evergreen and deciduous trees, shrubs, and climbers from tropics to temperate zones world wide....

 (Ilex) during the severe winters of the early 1940‘es led to their fossil pollen being used as climate indicators. Iversen demonstrated the steppe and tundra components of the late glacial flora. Iversen conducted a practical experiment with stone axe clear-cutting and slash-and-burn agriculture in a primeval forest to study the forest regeneration.
Iversen was state geologist at the Danish Geological Survey and lecturer in pollen analysis

Pollen analysis

Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred. Because the lake sediments accumulate over time, a core of the mud will show that the mud at the bottom...

 at the University of Copenhagen

University of Copenhagen

The University of Copenhagen is the oldest and largest university and research institution in Denmark. Founded in 1479, it has more than 37,000 students, the majority of whom are female , and more than 7,000 employees. The university has several campuses located in and around Copenhagen, with the...

. He was awarded honorary doctorates at Uppsala University

Uppsala University

Uppsala University is a research university in Uppsala, Sweden, and is the oldest university in Scandinavia, founded in 1477. It consistently ranks among the best universities in Northern Europe in international rankings and is generally considered one of the most prestigious institutions of...

 and Cambridge University.

Text-book of modern pollen analysis

• Fægri, Knut
  Knut Fægri
  Knut Fægri was a Norwegian botanist and palaeoecologist.- Academic career :Fægri was born in Bergen, and took the dr.philos. degree in 1934 with the thesis Über die Längenvariationen einiger Gletscher des Jostedalsbre und die dadurch bedingten Pflanzensukzessionen. He was hired as a research...
  
   & Iversen, J. (1950) Text-book of modern pollen analysis. Ejnar Munksgaard, Copenhagen. 168 p.
• Fægri, Knut & Iversen, J. (1964) Textbook of pollen analysis, 2nd edn. Scandinavian University Books, Copenhagen. 237 p.
• Fægri, K. & Iversen, J. (1975) Textbook of pollen analysis, 3rd ed. by Knut Fægri, Scandinavian University Books, Copenhagen. 294 p.
• Fægri, K. & Iversen, J. (1989) Textbook of pollen analysis. 4th ed. by K. Fægri, P.E. Kaland & K. Krzywinski. John Wiley & Sons, Chichester. 328 p.

Scientific works by Johs. Iversen

• Iversen, J. (1928) Über Isoëtes in China
  China
  Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...
  
   und Japan
  Japan
  Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
  
  . Dansk Botanisk Arkiv
  Dansk Botanisk Arkiv
  Dansk Botanisk Arkiv was a Danish scientific journal or monograph series concerning botany, issued by the Danish Botanical Society. It was published from 1913 to 1980.Articles were written in Danish, German, English and French...
  
  , 5 (23), 1-4.
• Iversen, J. (1928) Über die Spezies-Umgrenzung und Variation der Isoëtes echinospora Durieu. Botanisk Tidsskrift
  Botanisk Tidsskrift
  Botanisk Tidsskrift was a Danish mixed scientific and amateur journal concerning botany, issued in Copenhagen by the Danish Botanical Society...
  
  , 40 (2), 126-131.
• Iversen, J. (1929) Studien über die pH-Verhältnisse dänischer Gewässer und ihren Einfluss auf die Hydrophyten-Vegetation. Botanisk Tidsskrift
  Botanisk Tidsskrift
  Botanisk Tidsskrift was a Danish mixed scientific and amateur journal concerning botany, issued in Copenhagen by the Danish Botanical Society...
  
  , 40 (4), 277-333.
  • Keywords: plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. (1930) Isoëtes, In: Christensen, C.
  Carl Christensen
  Carl Frederik Albert Christensen was a Danish systematic botanist. He graduated in natural history from the University of Copenhagen under professor Eugenius Warming. He was first school teacher in Copenhagen, later superintendent at the Botanical Museum. He was a specialist in ferns and published...
  
  , The pteridophytes of Madagascar
  Madagascar
  The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...
  
  . Dansk Botanisk Arkiv
  Dansk Botanisk Arkiv
  Dansk Botanisk Arkiv was a Danish scientific journal or monograph series concerning botany, issued by the Danish Botanical Society. It was published from 1913 to 1980.Articles were written in Danish, German, English and French...
  
  , 7, 200-201.
• Gabrielsen, E.K. & Iversen, J. (1933) Die Vegetation der Halbinsel Skallingen. Botanisk Tidsskrift
  Botanisk Tidsskrift
  Botanisk Tidsskrift was a Danish mixed scientific and amateur journal concerning botany, issued in Copenhagen by the Danish Botanical Society...
  
  , 42 (4), 355-383.
  • Keywords: plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. (1933) Studier over Vegetationen i Ringkøbing Fjord før Hvide Sande-Kanalens genåbning 1931 (with Engl. summ.). In: Johansen, A.C. & Blegvad, H. (eds) Ringkøbing Fjords Naturhistorie i Brakvandsperioden 1915-1931.
  • Keywords: plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. (1934) Fund af Vildhest (Equus caballus) fra Overgangen mellem Sen- og Postglacialtid i Danmark. (Meddelelser fra Dansk Geologisk Forening, 8, 327-340 http://2dgf.dk/xpdf/bull-1934-8-4-327-340.pdf). Danmarks Geologiske Undersøgelse IV.række, 2 (13), 1-16.
• Iversen, J. (1934) Moorgeologische Untersuchungen auf Grönland
  Greenland
  Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...
  
  . Ein Beitrag zur Beleuchtung der Ursachen des Unterganges der mittelalterlichen Nordmännerkultur. Meddelelser fra Dansk Geologisk Forening, 8, 341-358. http://2dgf.dk/xpdf/bull-1934-8-4-341-358.pdf
  • Keywords: Demise of Greenland Norse settlements
• Iversen,J. (1936) Biologische Pflanzentypen als Hilfsmittel in der Vegetationsforschung. Ein Beitrag zur ökologischer Charakterisierung und Anordnung der Pflanzengesellshaften. Doctoral dissertation, University of Copenhagen. Levin & Munksgaard, København.
  • Keywords: plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. (1936) Sekundäres Pollen als Fehlerquelle. Eine Korrektionsmethode zur Pollenanalyse minerogener Sedimente. Danmarks Geologiske Undersøgelse IV.række, 2 (15), 1-24.
  • Keywords: pollen analysis
    Pollen analysis
    Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred. Because the lake sediments accumulate over time, a core of the mud will show that the mud at the bottom...
    
    
• Iversen, J. (1937) Pollenalalytiske Tidsbestemmelser af midtjydske mesolitiske
  Mesolithic
  The Mesolithic is an archaeological concept used to refer to certain groups of archaeological cultures defined as falling between the Paleolithic and the Neolithic....
  
   Bopladser (Appendix til Th. Mathiassen: Gudenaa-Kulturen). Aarbøger for nordisk Oldkyndighed og Historie 1937, 182-186.
• Iversen, J. (1937) Undersøgelser over Litorina
  Littorina Sea
  Littorina Sea is a geological brackish-water stage of the Baltic Sea, which existed around 7500–4000 BP and followed the Mastogloia Sea, transitional stage of the Ancylus Lake...
  
  transgressioner
  Transgression (geology)
  A marine transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, resulting in flooding. Transgressions can be caused either by the land sinking or the ocean basins filling with water...
  
   i Danmark. Meddelelser fra Dansk Geologisk Forening, 9, 223-232. http://2dgf.dk/xpdf/iversen1937_ocr.pdf
  • Nominated as one of the most significant 20th Century publications in Danish geology. It is one of the most cited publications on short-term, low-amplitude sea-level changes and their causes.
• Iversen, J. (1938) Et botanisk Vidne om Nordboernes Vinland
  Vinland
  Vinland was the name given to an area of North America by the Norsemen, about the year 1000 CE.There is a consensus among scholars that the Vikings reached North America approximately five centuries prior to the voyages of Christopher Columbus...
  
  srejser. Naturhistorisk Tidende, 2, 113-116.
• Iversen, J. (1939) Planterester fremdragne i tre Høje i Haderslev Amt. In: Broholm, H.C. & Hald, M. Skrydstrupfundet: en sønderjysk Kvindegrav fra den ældre Bronzealder. Nordiske Fortidsminder, 3, 18-21.
  • Keywords: plant macrofossil
    Macrofossil
    Macrofossils are preserved organic remains large enough to be visible without a microscope. Most fossils discussed in the article Fossil are macrofossils.-Macrofossil contrasted with Microfossil:...
    
    s, Bronze Age
    Bronze Age
    The Bronze Age is a period characterized by the use of copper and its alloy bronze as the chief hard materials in the manufacture of some implements and weapons. Chronologically, it stands between the Stone Age and Iron Age...
    
    , tumuli
• Iversen, J. (1940) Blütenbiologische Studien. I. Dimorphie und Monomorphie bei Armeria
  Armeria
  Armeria is the botanical name for a genus of flowering plants. These plants are sometimes known as "thrift" or as the "sea pinks" as they are often found on coastlines...
  
   (Eng. summ.) Biologiske Meddelelser / Kongelige Danske Videnskabernes Selskab, 15 (8), 1-40.
  • Keywords: palynology
    Palynology
    Palynology is the science that studies contemporary and fossil palynomorphs, including pollen, spores, orbicules, dinoflagellate cysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter and kerogen found in sedimentary rocks and sediments...
    
    
• Iversen, J. (1941) Landnam i Danmarks Stenalder
  Stone Age
  The Stone Age is a broad prehistoric period, lasting about 2.5 million years , during which humans and their predecessor species in the genus Homo, as well as the earlier partly contemporary genera Australopithecus and Paranthropus, widely used exclusively stone as their hard material in the...
  
  : En pollenanalytisk Undersøgelse over det første Landbrugs Indvirkning paa Vegetationsudviklingen (Dansk tekst 7-59, Engl. text 60-65). Danmarks Geologiske Undersøgelse II.række, 66, 1-68. (reprinted 1964)
  • Keywords: palaeoecology, history of agriculture
    History of agriculture
    Agriculture was developed at least 10,000 years ago, and it has undergone significant developments since the time of the earliest cultivation. The Fertile Crescent of Western Asia, Egypt, and India were sites of the earliest planned sowing and harvesting of plants that had previously been gathered...
    
    
• Degerbøl, M. & Iversen, J. (1942) On a find of Sheat-fish
  Catfish
  Catfishes are a diverse group of ray-finned fish. Named for their prominent barbels, which resemble a cat's whiskers, catfish range in size and behavior from the heaviest and longest, the Mekong giant catfish from Southeast Asia and the second longest, the wels catfish of Eurasia, to detritivores...
  
   (Silurus glanus L.) from the Ancylos period
  Boreal (period)
  In paleoclimatology of the Holocene, the Boreal was the first of the Blytt-Sernander sequence of north European climatic phases that were originally based on the study of Danish peat bogs, named for Axel Blytt and Rutger Sernander, who first established the sequence. In peat bog sediments, the...
  
   in Denmark. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, 105, 435-446.
• Iversen, J. & Olsen, Sigurd (1943) Die Verbreitung der Wasserpflanzen in Relation zur Chemie des Wassers. Botanisk Tidsskrift
  Botanisk Tidsskrift
  Botanisk Tidsskrift was a Danish mixed scientific and amateur journal concerning botany, issued in Copenhagen by the Danish Botanical Society...
  
  , 46, 136-145.
  • Keywords: plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. (1943) En pollenanalytisk Tidsfæstelse af Ferskvandlagene ved Nørre Lyngby. Meddelelser fra Dansk Geologisk Forening, 10, 130-151. http://2dgf.dk/xpdf/bull-1942-10-2-130-151.pdf
  • Keywords: Late Weichselian
• Iversen, J. (1943) Et Litorinaprofil
  Littorina Sea
  Littorina Sea is a geological brackish-water stage of the Baltic Sea, which existed around 7500–4000 BP and followed the Mastogloia Sea, transitional stage of the Ancylus Lake...
  
   ved Dybvad i Vendsyssel. Meddelelser fra Dansk Geologisk Forening, 10, 324-328. http://2dgf.dk/xpdf/bull-1943-10-3-324-328.pdf
• Iversen, J. (1944) Viscum
  Viscum
  Viscum is a genus of about 70-100 species of mistletoes, native to temperate and tropical regions of Europe, Africa, Asia and Australasia. Traditionally, the genus has been placed in its own family Viscaceae, but recent genetic research by the Angiosperm Phylogeny Group shows this family to be...
  
  , Hedera and Ilex as climatic indicators. A contribution to the study of the Post-Glacial
  Holocene
  The Holocene is a geological epoch which began at the end of the Pleistocene and continues to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words and , meaning "entirely recent"...
  
   temperature climate. Geologiska Föreningens i Stockholm Förhandlingar, 66, 463-483.
  • Keywords: palaeoecology, plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. (1944) Helianthemum
  Helianthemum
  Helianthemum , known as rock rose, sunroses, or rushrose, is a genus of about 110 species of evergreen or semi-evergreen subshrubs in the family Cistaceae...
  
   som fossil Glacialplante i Danmark. Geologiska Föreningens i Stockholm Förhandlingar, 66, 774-776.
  • Keywords: Late Weichselian
• Degerbøl, M. & Iversen, J. (1945) The bison
  Wisent
  The wisent , Bison bonasus, also known as the European bison or European wood bison, is a species of Eurasian bison. It is the heaviest surviving land animal in Europe; a typical wisent is about long, not counting a tail of long, and tall. Weight typically can range from , with an occasional big...
  
   in Denmark. A zoological and geological investigation of the finds in Danish Pleistocene
  Pleistocene
  The Pleistocene is the epoch from 2,588,000 to 11,700 years BP that spans the world's recent period of repeated glaciations. The name pleistocene is derived from the Greek and ....
  
   deposits. Danmarks Geologiske Undersøgelse II.række, 73, 1-62.
• Iversen, J. (1946) Datering af en senglacial Boplads ved Bromme (Datation Géologique de la station glaciaire postérieure de Bromme). Aarbøger for nordisk Oldkyndighed og Historie 1946: 197-231.
  • Keywords: Late Weichselian
• Iversen, J. (1947) Plantevækst, Dyreliv og Klima i det senglaciale Danmark. Geologiska Föreningens i Stockholm Förhandlingar, 69, 67-78.
  • Keywords: Late Weichselian
• Iversen, J. (1947) Centaurea cyanus-pollen in Danish late-glacial deposits. Meddelelser fra Dansk Geologisk Forening, 11, 197-200. http://2dgf.dk/xpdf/bull-1947-11-2-197-200.pdf
  • Keywords: Late Weichselian
• Iversen, J. (1947) Senglacialens nivåförändingar och klimatutveckling (contribution to discussion). In: Geologklubben vid Stockholms Högskola. Nordiskt kvartärgeologisk möte den 5–9 November 1945 [pp. 215–217, 252]. Geologiska Föreningens i Stockholm Förhandlingar, 69, 215-217.
  • Keywords: Late Weichselian
• Iversen, J. (1947) Pollenanalysens
  Pollen analysis
  Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred. Because the lake sediments accumulate over time, a core of the mud will show that the mud at the bottom...
  
   principer och tillämpning (contribution to discussion). In: Geologklubben vid Stockholms Högskola. Nordiskt kvartärgeologisk möte den 5–9 November 1945. Geologiska Föreningens i Stockholm Förhandlingar, 69, 241-242.
• Iversen, J. (1948) Palaeobotany and pollen analysis
  Pollen analysis
  Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred. Because the lake sediments accumulate over time, a core of the mud will show that the mud at the bottom...
  
  . In: The humanities and the Sciences in Denmark during the Second World War. Ejnar Munksgaard, Copenhagen, pp 313–315.
• Iversen, J. (1949) The influence of prehistoric man on vegetation. Danmarks Geologiske Undersøgelse IV.række, 3 (6), 1-25.
  • Keywords: palaeoecology, history of agriculture
    History of agriculture
    Agriculture was developed at least 10,000 years ago, and it has undergone significant developments since the time of the earliest cultivation. The Fertile Crescent of Western Asia, Egypt, and India were sites of the earliest planned sowing and harvesting of plants that had previously been gathered...
    
    
• Iversen, J. (1949) Determinations of the specific gravity of the roots of swamp, meadow and dry-soil plants. Oikos
  Oikos
  An oikos is the ancient Greek equivalent of a household, house, or family....
  
  , 1, 1-5. http://links.jstor.org/sici?sici=0030-1299(1949)1%3A1%3C1%3ADOTSGO%3E2.0.CO%3B2-R
  • Keywords: plant ecology
    Ecology
    Ecology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
    
    
• Iversen, J. & Troels-Smith, J. (1950) Pollenmorfologiske definitioner og typer. Danmarks Geologiske Undersøgelse IV.række, 3 (8), 1-54.
  • Keywords: palynology
    Palynology
    Palynology is the science that studies contemporary and fossil palynomorphs, including pollen, spores, orbicules, dinoflagellate cysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter and kerogen found in sedimentary rocks and sediments...
    
    
• Iversen, J. (1951) Steppeelementer i den senglaciale flora og fauna (Eng. summ.. Meddelelser fra Dansk Geologisk Forening, 12, 174-175. http://2dgf.dk/xpdf/bull-1951-12-1-127-194.pdf
  • Keywords: Late Weichselian
• Iversen, J. (1952/53) Origin of the flora of Western Greenland
  Greenland
  Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...
  
   in the light of pollen analysis
  Pollen analysis
  Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred. Because the lake sediments accumulate over time, a core of the mud will show that the mud at the bottom...
  
  . Oikos
  Oikos
  An oikos is the ancient Greek equivalent of a household, house, or family....
  
  , 4, 85-103. http://links.jstor.org/sici?sici=0030-1299(1952%2F1953)4%3A2%3C85%3AOOTFOW%3E2.0.CO%3B2-C
• Iversen, J. (1953) Radiocarbon dating of the Alleröd
  Allerød Oscillation
  The Allerød period was a warm and moist global interstadial that occurred at the end of the last glacial period. The Allerød oscillation raised temperatures , before they declined again in the succeeding Younger Dryas period, which was followed by the present interglacial period.In some regions,...
  
   period. Science, 118 (3053), 4-6. http://www.sciencemag.org/cgi/reprint/118/3053/9
• Iversen, J. (1953) Origin and postglacial development of the flora of West Greenland
  Greenland
  Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...
  
   in the light of pollen analysis
  Pollen analysis
  Analysis of the distribution of pollen grains of various species contained in surface layer deposits, especially peat bogs and lake sediments, from which a record of past climate may be inferred. Because the lake sediments accumulate over time, a core of the mud will show that the mud at the bottom...
  
  . Proceedings of the Seventh International Botanical Congress Stockholm, July 12–20, 1950 (eds H. Osvald & E. Åberg), pp. 634–636.
• Iversen, J. (1953) Identification of difficult pollen types by means of structural characters. Proceedings of the Seventh International Botanical Congress Stockholm, July 12–20, 1950 (eds H. Osvald & E. Åberg), pp. 873–874.
  • Keywords: palynology
    Palynology
    Palynology is the science that studies contemporary and fossil palynomorphs, including pollen, spores, orbicules, dinoflagellate cysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter and kerogen found in sedimentary rocks and sediments...
    
    
• Iversen, J. (1953) The zonation of the salt marsh vegetation of Skallingen in 1931-34 and in 1952. Geografisk Tidsskrift, 52, 113-118.
• Iversen, J. (1954) The Late-Glacial flora of Denmark and its relation to climate and soil. Danmarks Geologiske Undersøgelse II.række, 80, 87-119.
  • Keywords: Late Weichselian
• Iversen,J. (1954) The late-glacial flora of South-Scandinavia and its recent relics. Huitième Congrès International de Botanique, Paris 1954, Comptes rendus des séances et rapports et communications déposés lors du congrès dans les sections 3,4,5 et 6 pp. 241–242.
  • Keywords: Late Weichselian
• Iversen, J. (1954) Über die Korrelationen zwischen den Pflanzenarten in einem grönländischen Talgebiet. Vegetatio, 5-6, 238-246.
• Iversen, J. (1956) Forest clearance in the stone age
  Stone Age
  The Stone Age is a broad prehistoric period, lasting about 2.5 million years , during which humans and their predecessor species in the genus Homo, as well as the earlier partly contemporary genera Australopithecus and Paranthropus, widely used exclusively stone as their hard material in the...
  
  . Scientific American
  Scientific American
  Scientific American is a popular science magazine. It is notable for its long history of presenting science monthly to an educated but not necessarily scientific public, through its careful attention to the clarity of its text as well as the quality of its specially commissioned color graphics...
  
  , 194, 36-41.
  • German translation (1956) Neolitische Waldrodungen beleuchtet durch Pollenanalyse und Experiment. Mitteilungen der Naturforschender Gesellschaft Bern N.F., 13, 30-32.
  • French translation (1960) Le défrichement da la forêt pendant l’age de pierre. Les Naturalistes Belges, 41, 53-64.
  • Keywords: palaeoecology, history of agriculture
    History of agriculture
    Agriculture was developed at least 10,000 years ago, and it has undergone significant developments since the time of the earliest cultivation. The Fertile Crescent of Western Asia, Egypt, and India were sites of the earliest planned sowing and harvesting of plants that had previously been gathered...
    
    
• Iversen, J. (1957) Istidsrelikter i Bornholm
  Bornholm
  Bornholm is a Danish island in the Baltic Sea located to the east of the rest of Denmark, the south of Sweden, and the north of Poland. The main industries on the island include fishing, arts and crafts like glass making and pottery using locally worked clay, and dairy farming. Tourism is...
  
  s flora. In: Bornholms naturhistoriske Forening, udgivet i anledning af 25 års jubilæet pp. 35–37.
  • Keywords: Late Weichselian
• Iversen, J. (1954) Pollenanalytischer Nachweis des Reliktencharakters eines jütischen Linden
  Tilia
  Tilia is a genus of about 30 species of trees native throughout most of the temperate Northern Hemisphere. The greatest species diversity is found in Asia, and the genus also occurs in Europe and eastern North America, but not western North America...
  
  -Mischwaldes. Veröffentlichungen des Geobotanischen Institutes Rübel in Zürich, 33, 137-144.
• Iversen, J. (1958) The bearing of glacial and interglacial epochs on the formation and extinction of plant taxa. In: Hedberg, O. (ed.): Systematics of to-day. Proceedings of a symposium held at the University of Uppsala in commemorotion of the 250th anniversary of Carolus Linnaeus. Acta Universitatis Upsaliensis/Uppsala Universitets Årsskrift, 1958 (6), 210-215.
  • Keywords: evolution
    Evolution
    Evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.Life on Earth...
    
    
• Iversen, J. (1960) Problems of the early post-glacial
  Holocene
  The Holocene is a geological epoch which began at the end of the Pleistocene and continues to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words and , meaning "entirely recent"...
  
   forest development in Denmark. Danmarks Geologiske Undersøgelse IV.række, 4 (3), 1-32.
  • Keywords: palaeoecology
• Iversen, J. (1964) Retrogressive vegetational succession in the Post-glacial
  Holocene
  The Holocene is a geological epoch which began at the end of the Pleistocene and continues to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words and , meaning "entirely recent"...
  
  . Journal of Ecology
  Journal of Ecology
  The Journal of Ecology is a bimonthly peer-reviewed scientific journal covering all aspects of the ecology of plants. It was established in 1913 and is published by Wiley-Blackwell on behalf of the British Ecological Society....
  
  , 52S, 59-70.
  • Keywords: palaeoecology
• Iversen, J. (1964) Plant indicators of climate, soil and other factors during the Quaternary
  Quaternary
  The Quaternary Period is the most recent of the three periods of the Cenozoic Era in the geologic time scale of the ICS. It follows the Neogene Period, spanning 2.588 ± 0.005 million years ago to the present...
  
  . INQUA VIth international Congress on the Quaternary, Warszawa 1961, 2, 421-428.
• Iversen, J. & Fægri, Knut (1965) Field techniques. In: Handbook of Paleontological Techniques, p. 482-494. San Francisco.
• Iversen, J. & Fægri, Knut (1966) terminology in palynology
  Palynology
  Palynology is the science that studies contemporary and fossil palynomorphs, including pollen, spores, orbicules, dinoflagellate cysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter and kerogen found in sedimentary rocks and sediments...
  
  . Pollen et Spores, 8, 345-445.
• Iversen, J. (1969) Retrogressive development of a forest ecosystem demonstrated by pollen diagrams from a fossil mor. Oikos
  Oikos
  An oikos is the ancient Greek equivalent of a household, house, or family....
  
  , 12S, 35-49.
  • Keywords: palaeoecology
• Iversen, J. (1973) The development of Denmark's nature since the last glacial. Danmarks Geologiske Undersøgelse V.række, 7C, 1-126.
  • Keywords: palaeoecology

Works on Johs. Iversen

• Obituary in Botanisk Tidsskrift
  Botanisk Tidsskrift
  Botanisk Tidsskrift was a Danish mixed scientific and amateur journal concerning botany, issued in Copenhagen by the Danish Botanical Society...
  
  67 (3): 275-277 (1972) by Svend Th. Andersen.
• Obituary in the New Phytologist 72 (5): 1245-1250 (1973) by Harry Godwin
  Harry Godwin
  Sir Harry Godwin FRS, was a prominent English botanist and ecologist of the 20th century. He had a long association with Clare College, Cambridge.-Early life:...
  
  . http://doi.dx.org/doi:10.1111/j.1469-8137.1973.tb02100.x