biology

Kerguelen tern

Kerguelen tern 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 Kerguelen tern rather than just read about it. In short: The Kerguelen tern (Sterna virgata) is a tern of the Southern Hemisphere. This seabird mainly breeds colonially in the Kerguelen Islands, as its common name implies.

Key takeaways

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

Reference excerpt

The Kerguelen tern (Sterna virgata) is a tern of the Southern Hemisphere. This seabird mainly breeds colonially in the Kerguelen Islands, as its common name implies. However, smaller colonies are also found in the Prince Edward Islands (i.e. Prince Edward and Marion) and Crozet Islands. The total number of individuals is from 3,500 to 6,500 birds, although there is no recent data from the main colony at Kerguelen. These birds do not inhabit Kerguelen proper, instead nesting on islets free of feral cats. During bad weather, they are known to abandon their colonies. Kerguelen terns are among the least-ranging of all typical terns. They generally do not reach far into the seas near their breeding grounds. These birds eat fish and marine invertebrates, especially those found in beds of the seaweed Macrocystis spp. They sometimes also hunt insects on land and catch fish from rivers on Kerguelen. There are two subspecies:

S. v. mercuri (Voisin, 1971) – Crozet and Prince Edward Island's S. v. virgata (Cabanis, 1875) – Kerguelen Island

References

Sterna virgata at Birdlife International accessed August 26, 2006

Illustrations

Worked examples

Example 1 — a first encounter with Kerguelen tern

Start with the simplest possible case. Write down what Kerguelen tern 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 Kerguelen tern 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 Kerguelen tern 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 Kerguelen tern

In research: Kerguelen tern 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 Kerguelen tern 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: Kerguelen tern is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1875, Birds of subantarctic islands, Birds of the Indian Ocean, so understanding it makes those chapters shorter.
In everyday life: Look for Kerguelen tern 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 Kerguelen tern in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kerguelen tern 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 Kerguelen tern out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kerguelen tern in simple terms?

The Kerguelen tern (Sterna virgata) is a tern of the Southern Hemisphere. This seabird mainly breeds colonially in the Kerguelen Islands, as its common name implies.

Why does Kerguelen tern 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 Kerguelen tern?

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 Kerguelen tern.