biology

Southern pochard

Southern pochard 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 Southern pochard rather than just read about it. In short: The southern pochard (Netta erythrophthalma) is a species of duck, and a member of the genus Netta. There are two subspecies, the South American (southern) pochard N. e. erythrophthalma (Wied-Neuwied, 1833) and the African (southern) pochard N. e. brunnea (Eyton, 1838).

Key takeaways

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

Reference excerpt

The southern pochard (Netta erythrophthalma) is a species of duck, and a member of the genus Netta. There are two subspecies, the South American (southern) pochard N. e. erythrophthalma (Wied-Neuwied, 1833) and the African (southern) pochard N. e. brunnea (Eyton, 1838). The South American pochard has a fragmented range and is found from Colombia, Venezuela, Brazil, Ecuador, Peru, Bolivia and Argentina to Chile. Here it occurs in a wide variety of shallow fresh waters with submerged vegetation, from the lowlands up to 3,700 metres. The African pochard occurs from the Cape to the Ethiopian highlands on water bodies with or without emergent vegetation. They are suspected to have been strong migrants in the past but the construction of numerous farm dams seems to allow them a more sedentary lifestyle. They reach highest concentrations in Africa's central plateaus and in the south-western winter rainfall region.

Taxonomy Two syntype specimens of Nyroca brunnea Eyton (Monogr. Anat., 1838, p.161., pl.23.), the African Southern Pochard, are held in the vertebrate zoology collections of National Museums Liverpool at World Museum, with accession numbers NML-VZ D832 (male adult) and NML-VZ D832a (female adult). The specimens were collected in South Africa and came to the Liverpool national collection via Thomas Campbell Eyton's collection and the 13th Earl of Derby's collection which was bequeathed to the city of Liverpool. There are two other syntype specimens, including NHMUK 1845.7.6.271, in the Natural History Museum at Tring.

Habits Southern pochards are sociable and gregarious. They have been seen in groups of up to 5,000.

Mating and nesting The birds are solitary nesters, building nests out of leaves and stems on the banks of a river surrounded by vegetation. The female southern pochard lays a clutch consisting of six to fifteen eggs. The female incubates the eggs for 20 to 28 days. Once the eggs hatch, the mother leads them immediately to water.

Eating habits The southern pochard eats mainly aquatic plants, which it finds when diving. The adults also feed on larvae, pupae, aquatic animals and plant material.

Conservation status The southern pochard population has been steadily declining since the 1970s. In 2016, the number of southern pochards was reported at around 25,000 in South America, but this could have been an overestimate due to a lack of data.

References

Cisneros-Heredia, Diego F. "Información Sobre la Distribución de Algunas Especies de Aves de Ecuador" (PDF). Boletín SAO (in Spanish). XVI (1): 7. Maclean, G.L.; Harrison, J.A. "Southern Pochard". The atlas of southern African birds. Volume 1: Non-passerines.

External links

Species text in The Atlas of Southern African Birds.

Illustrations

Worked examples

Example 1 — a first encounter with Southern pochard

Start with the simplest possible case. Write down what Southern pochard 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 Southern pochard 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 Southern pochard 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 Southern pochard

In research: Southern pochard 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 Southern pochard 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: Southern pochard is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anseriformes stubs, Birds described in 1833, Birds of South America, so understanding it makes those chapters shorter.
In everyday life: Look for Southern pochard 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 Southern pochard in 20 minutes

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

Frequently asked questions

What is Southern pochard in simple terms?

Why does Southern pochard 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 Southern pochard?

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 Southern pochard.