biology

Jürgen Haffer

Jürgen Haffer is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jürgen Haffer rather than just read about it. In short: Jürgen Haffer (9 December 1932 in Berlin – 26 April 2010 in Essen) was a German ornithologist, biogeographer, and geologist. He is most remembered for his theory of Amazonian forest refugia during the Pleistocene that would have contributed to speciation and the diversification of the biota.

Key takeaways

Jürgen Haffer belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Jürgen Haffer to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Jürgen Haffer from memory before moving on to harder problems.

Reference excerpt

Jürgen Haffer (9 December 1932 in Berlin – 26 April 2010 in Essen) was a German ornithologist, biogeographer, and geologist. He is most remembered for his theory of Amazonian forest refugia during the Pleistocene that would have contributed to speciation and the diversification of the biota.

Biography At the age of 13 Haffer found a dead bird with a ring and had taken it to the Berlin Museum where he met Erwin Stresemann who took time to explain to him the purpose of ringing. This made a big impression on him and it marked the beginning of his ornithological interest. He was the fourth child of Oskar Haffer and Margarete. His father was a high school teacher with a training in biology who encouraged an interest in natural history. After schooling, Haffer worked during the summer of 1951 under Stresemann before going to university. Knowing that ornithology did not offer a career, he studied geology and paleontology. He obtained a Diploma in 1956 and continued on for a doctoral degree in 1957 at the University of Göttingen - working on "Early heterodont Lamellibranchs of the Rhineland Devonian". He obtained employment with Mobil Oil as a field geologist and went to remote places like lowland Colombia and lived in South and North America, Iran, Egypt, and Norway. During his stay in Colombia he met Maria Kluge, a teacher in Bogotá with an interest in Amazonia, marrying her in 1959. During this time he studied the bird faunas of Amazonia and Iran. In close communication with evolutionary biologist Ernst Mayr since the early 1960s, Haffer formulated his ideas on the diversification of birds and the effects of barriers. In 1978 Beryl B. Simpson and Haffer published their analysis of speciation patterns in Amazonia. From his studies on the Amazonian avifauna, Haffer authored several papers on Neotropical ornithology and devised his Amazonian refugia theory to explain the rapid diversification of the Neotropical fauna in Pleistocene times. He used the toucanet of the genus Selenidera to explain speciation using the idea of refugia. Haffer's scientific output was substantial, with some 200 scientific publications. Haffer wrote the first book-length biography of Ernst Mayr and co-authored a biography of Erwin Stresemann, Mayr's teacher and friend. Haffer's foreword on species concepts is included in volume 4 of the Handbook of the Birds of the World. He also wrote extensively on the history and development of ornithology. In 1975, he was awarded the William Brewster Memorial Award. In 2013, Haffer was commemorated with the newly described Campina jay, Cyanocorax hafferi.

References

Sources Haffer, Jurgen (1969). Speciation in Amazonian Forest Birds. Science. Vol. 165:131-137.

Worked examples

Example 1 — a first encounter with Jürgen Haffer

Start with the simplest possible case. Write down what Jürgen Haffer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jürgen Haffer before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jürgen Haffer ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jürgen Haffer

In research: Jürgen Haffer appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Jürgen Haffer in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Jürgen Haffer is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1932 births, 2010 deaths, 20th-century German biologists, so understanding it makes those chapters shorter.
In everyday life: Look for Jürgen Haffer outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jürgen Haffer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Jürgen Haffer means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Jürgen Haffer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jürgen Haffer in simple terms?

Why does Jürgen Haffer matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jürgen Haffer?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jürgen Haffer.