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Gibson Plumage Index

Gibson Plumage Index 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 Gibson Plumage Index rather than just read about it. In short: The Gibson Plumage Index (GPI), sometimes known as the Gibson Code, is a system for describing the plumage of great albatrosses. It is named after, and originally devised in the late 1950s by, John Douglas Gibson and other members of the New South Wales Albatross Study Group.

Key takeaways

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

Reference excerpt

The Gibson Plumage Index (GPI), sometimes known as the Gibson Code, is a system for describing the plumage of great albatrosses. It is named after, and originally devised in the late 1950s by, John Douglas Gibson and other members of the New South Wales Albatross Study Group. Gibson was an Australian amateur ornithologist who carried out fieldwork on albatrosses along the coast of New South Wales for thirty years. The index assigns separate numerical values (from 1 to 6 with increasing proportion of white) to the degrees of colouration on four parts of the body - the back, head, inner wing and tail - of albatrosses to indicate variations in age and between different breeding populations. For instance, a bird with a completely brown back would receive a score of 1 for the back, while a bird with an all-white back would be scored as a 6. The index was later expanded by Pierre Jouventin and colleagues to cover the more complex patterning of the Amsterdam albatross, adding belly and tibial feather colouration. This system for categorising the wide and complex variation in appearance of great albatrosses has been instrumental in the discovery of several genetically isolated populations and consequent description of new taxa, and has made field identification easier.

References

Worked examples

Example 1 — a first encounter with Gibson Plumage Index

Start with the simplest possible case. Write down what Gibson Plumage Index 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 Gibson Plumage Index 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 Gibson Plumage Index 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 Gibson Plumage Index

In research
Gibson Plumage Index 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 Gibson Plumage Index 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
Gibson Plumage Index is common in secondary-school and first-year university syllabi. It links to neighbouring topics Albatrosses, Bird anatomy, Ornithological equipment and methods, so understanding it makes those chapters shorter.
In everyday life
Look for Gibson Plumage Index 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 Gibson Plumage Index in 20 minutes

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

Frequently asked questions

What is Gibson Plumage Index in simple terms?

The Gibson Plumage Index (GPI), sometimes known as the Gibson Code, is a system for describing the plumage of great albatrosses. It is named after, and originally devised in the late 1950s by, John Douglas Gibson and other members of the New South Wales Albatross Study Group.

Why does Gibson Plumage Index 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 Gibson Plumage Index?

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 Gibson Plumage Index.

Tags

  • Albatrosses
  • Bird anatomy
  • Ornithological equipment and methods

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