Ivan (or Janez) Regen (known also as Johann Regen) (December 9, 1868 – July 27, 1947) was a

Slovenian Slovene or Slovenian may refer to: * Something of, from, or related to Slovenia, a country in Central Europe * Slovene language, a South Slavic language mainly spoken in Slovenia * Slovenes, an ethno-linguistic group mainly living in Slovenia * Sl ...

biologist A biologist is a scientist who conducts research in biology. Biologists are interested in studying life on Earth, whether it is an individual cell, a multicellular organism, or a community of interacting populations. They usually specialize ...

, best known for his studies in the field of

bioacoustics Bioacoustics is a cross-disciplinary science that combines biology and acoustics. Usually it refers to the investigation of sound production, dispersion and reception in animals (including humans). This involves neurophysiological and anatomical ...

. Regen was born in the hamlet of Lajše in Trata (today part of Gorenja Vas,

Slovenia Slovenia ( ; sl, Slovenija ), officially the Republic of Slovenia (Slovene: , abbr.: ''RS''), is a country in Central Europe. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, and ...

) and became interested in

insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three pa ...

sounds as a child. His family couldn't afford to pay for his schooling, so he studied first at the local

seminary A seminary, school of theology, theological seminary, or divinity school is an educational institution for educating students (sometimes called ''seminarians'') in scripture, theology, generally to prepare them for ordination to serve as clergy ...

for which he received a scholarship, and slowly saved enough funds for the tuition fee in Vienna. There he studied natural history at the

University of Vienna The University of Vienna (german: Universität Wien) is a public research university located in Vienna, Austria. It was founded by Duke Rudolph IV in 1365 and is the oldest university in the German-speaking world. With its long and rich hi ...

under the tutorship of Grobben, Exner and

Claus Claus (sometimes Clas) is both a given name and a German, Danish, and Dutch surname. Notable people with the name include: Given name *Claus Schenk Graf von Stauffenberg (1907–1944), a German officer who, along with others, attempted to assassin ...

. He received his

doctorate A doctorate (from Latin ''docere'', "to teach"), doctor's degree (from Latin ''doctor'', "teacher"), or doctoral degree is an academic degree awarded by universities and some other educational institutions, derived from the ancient formalism ''l ...

in 1897 and began to work as a gymnasium professor, first in Vienna, and later in Hranice (

Moravia Moravia ( , also , ; cs, Morava ; german: link=yes, Mähren ; pl, Morawy ; szl, Morawa; la, Moravia) is a historical region in the east of the Czech Republic and one of three historical Czech lands, with Bohemia and Czech Silesia. The ...

). At last he was transferred back to a gymnasium in Vienna after a recommendation from Exner and worked there until his retirement in 1918. In the meantime Regen began his research in

animal physiology Physiology (; ) is the scientific study of functions and mechanisms in a living system. As a sub-discipline of biology, physiology focuses on how organisms, organ systems, individual organs, cells, and biomolecules carry out the chemical a ...

, being one of the first Slovenian scientists to work abroad after the . With careful observations of

katydid Insects in the family Tettigoniidae are commonly called katydids (especially in North America), or bush crickets. They have previously been known as "long-horned grasshoppers". More than 8,000 species are known. Part of the suborder Ensifera, ...

and

cricket Cricket is a bat-and-ball game played between two teams of eleven players on a field at the centre of which is a pitch with a wicket at each end, each comprising two bails balanced on three stumps. The batting side scores runs by st ...

stridulation Stridulation is the act of producing sound by rubbing together certain body parts. This behavior is mostly associated with insects, but other animals are known to do this as well, such as a number of species of fish, snakes and spiders. The mech ...

he proved that insects respond to acoustic stimuli from other individuals and was able to provoke his subjects to respond to artificial stimulation using a loudspeaker. Later, he demonstrated that insect hearing depends on intact

tympanal organ A tympanal organ (or tympanic organ) is a hearing organ in insects, consisting of a membrane ( tympanum) stretched across a frame backed by an air sac and associated sensory neurons. Sounds vibrate the membrane, and the vibrations are sensed by ...

which was the first description of this organ's function. For his contributions he is regarded as the founder of modern bioacoustics. He also studied other physiological phenomena in insects, such as

breathing Breathing (or ventilation) is the process of moving air into and from the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen. All aerobic creatures need oxygen for cellu ...

hibernation Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It mos ...

, the development of

pigment A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compou ...

under different conditions, and

ecdysis Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa. Since the cuticle of these animals typically forms a largely inelastic exoskeleton, it is shed during growth and a new, larger covering is formed. The remnan ...

. Regen's largest project was a so-called "geobiological laboratory", a large terrarium in which he studied phonotaxis on a large scale. Using as many as 1600 females with intact or damaged hearing organs, he was able to statistically evaluate their behaviour. Gogala M. (2008).
Pionir bioakustike Ivan Regen in njegova zapuščina
�. Sedemdeset let biblioteke

SAZU The Slovenian Academy of Sciences and Arts ( sl, Slovenska akademija znanosti in umetnosti (SAZU)) is the national academy of Slovenia, which encompasses science and the arts and brings together the top Slovene researchers and artists as members o ...

. He was a private researcher since 1911, but remained in touch with Slovenia, supporting several local societies and cultural institutions, and establishing Slovene terminology for the fields he worked in. In 1921, he declined the invitation to become a professor at the

University of Ljubljana The University of Ljubljana ( sl, Univerza v Ljubljani, , la, Universitas Labacensis), often referred to as UL, is the oldest and largest university in Slovenia. It has approximately 39,000 enrolled students. History Beginnings Although certain ...

. In 1940, he became an associate member of

Slovenian Academy of Sciences and Arts The Slovenian Academy of Sciences and Arts ( sl, Slovenska akademija znanosti in umetnosti (SAZU)) is the national academy of Slovenia, which encompasses science and the arts and brings together the top Slovene researchers and artists as members ...

and was also an honorary member of Slovenian society of natural history.

References

{{DEFAULTSORT:Regen, Ivan 1868 births 1947 deaths Slovenian entomologists Members of the Slovenian Academy of Sciences and Arts University of Vienna alumni People from the Municipality of Gorenja Vas-Poljane