biology

Mareca

Mareca 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 Mareca rather than just read about it. In short: Mareca is a genus or subgenus of ducks in the family Anatidae that includes the wigeons. The genus Mareca was introduced by English naturalist James Francis Stephens in 1824.

Key takeaways

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

Reference excerpt

Mareca is a genus or subgenus of ducks in the family Anatidae that includes the wigeons. The genus Mareca was introduced by English naturalist James Francis Stephens in 1824. The type species is the Eurasian wigeon. The name of the genus is from the Portuguese word Marreco for a small duck. The species now placed in this genus were formerly placed in the genus Anas. A molecular phylogentic study comparing mitochondrial DNA sequences published in 2009 found that the genus Anas, as then defined, was not monophyletic. Based on the published phylogeny, the genus Anas was split into four monophyletic genera with five extant species moved into the resurrected genus Mareca.

Species The genus Mareca contains five extant species and one extinct species:

Phylogeny Cladogram based on the analysis of Gonzalez and colleagues published in 2009.

References

Illustrations

Worked examples

Example 1 — a first encounter with Mareca

Start with the simplest possible case. Write down what Mareca 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 Mareca 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 Mareca 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 Mareca

In research: Mareca 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 Mareca 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: Mareca is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anseriformes stubs, Bird genera, Mareca, so understanding it makes those chapters shorter.
In everyday life: Look for Mareca 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 Mareca in 20 minutes

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

Frequently asked questions

What is Mareca in simple terms?

Mareca is a genus or subgenus of ducks in the family Anatidae that includes the wigeons. The genus Mareca was introduced by English naturalist James Francis Stephens in 1824.

Why does Mareca 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 Mareca?

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 Mareca.