biology

SplitsTree

SplitsTree 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 SplitsTree rather than just read about it. In short: SplitsTree is a freeware program for inferring phylogenetic trees, phylogenetic networks, or, more generally, split graphs, from various types of data such as a sequence alignment, a distance matrix or a set of trees. Software SplitsTree implements published methods such as split decomposition, neighbor-net, consensus networks, super networks methods or methods for computing hybridization or simple recombination net…

Key takeaways

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

Reference excerpt

SplitsTree is a freeware program for inferring phylogenetic trees, phylogenetic networks, or, more generally, split graphs, from various types of data such as a sequence alignment, a distance matrix or a set of trees.

Software SplitsTree implements published methods such as split decomposition, neighbor-net, consensus networks, super networks methods or methods for computing hybridization or simple recombination networks. It uses the NEXUS file format. The splits graph is defined using a special data block (SPLITS block).

See also Phylogenetic tree viewers Dendroscope MEGAN

References

External links SplitsTree homepage (New Website for informations about SplitsTree) Alternative download page for the latest version (4.15) and manual (June 2019), hosted by the Department of Computer Science at the Eberhard Karls University Tübingen Algorithms in Bioinformatics, Daniel Huson's working group developing SplitsTree and other bioinformatics software List of phylogeny software, hosted at the University of Washington The Genealogical World of Phylogenetic Networks provides a wide range of examples for splits graphs, most of which were generated with SplitsTree Who is Who in Phylogenetic Networks lists software, researchers and literature dealing with phylogenetic networks

Illustrations

Worked examples

Example 1 — a first encounter with SplitsTree

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

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

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

Frequently asked questions

What is SplitsTree in simple terms?

Why does SplitsTree 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 SplitsTree?

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 SplitsTree.