biology

Saddle-backed Rodrigues giant tortoise

Saddle-backed Rodrigues giant tortoise 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 Saddle-backed Rodrigues giant tortoise rather than just read about it. In short: The saddle-backed Rodrigues giant tortoise (Cylindraspis vosmaeri) is an extinct species of giant tortoise in the family Testudinidae. The species was endemic to Rodrigues.

Key takeaways

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Reproduce the core statement of Saddle-backed Rodrigues giant tortoise from memory before moving on to harder problems.

Reference excerpt

The saddle-backed Rodrigues giant tortoise (Cylindraspis vosmaeri) is an extinct species of giant tortoise in the family Testudinidae. The species was endemic to Rodrigues. Human exploitation caused the extinction of this species around 1800.

Etymology The specific name, vosmaeri, is in honor of Dutch naturalist Arnout Vosmaer (1720–1799).

Taxonomy

Both Cylindraspis vosmaeri and its smaller domed relative, Cylindraspis peltastes, were descended from an ancestral species on Mauritius (an ancestor of Cylindraspis inepta), which colonised Rodrigues by sea many millions of years ago, and then gradually differentiated into the two Rodrigues species.

Description The saddle-backed Rodrigues giant tortoise was an exceptionally tall species of giant tortoise, with a long, raised neck and an upturned carapace, which gave it a giraffe-like body shape almost similar to that of a sauropod dinosaur. It lived by browsing the taller vegetation, while its much smaller relative, the domed Rodrigues giant tortoise, grazed on low vegetation such as fallen leaves and grasses.

Behavior The saddle-backed Rodrigues giant tortoise was described by early colonists as a docile, gentle browser, with a tendency to gather in large herds, especially in the evening. An early Huguenot settler, in 1707, described the unusual group behaviour of these animals: "There's one thing very odd among them; they always place sentinels, at some distance from the troop at the four corners of the camp, to which the sentinels turn their backs, and look with their eyes, as if they were on watch. This we have always observed of them; and this mystery seems the more difficult to be comprehended, for that these creatures are incapable to defend themselves..." (Leguat, 1707)

Ecology It has subsequently been discovered that the browsing herds of giant tortoises filled an essential role in the ecosystem of Rodrigues and the regeneration of its forests. Among other roles, the giant tortoises ensured the dispersal and germination of tree seeds, as well as "terraforming" the island by maintaining forest clearings and pools. In recognition of this fact, measures have been undertaken to introduce replacement species, in the form of similar giant tortoises from other parts of the world, to assist in the rebuilding of Rodrigues' devastated environment. The replacement species for the saddle-backed Rodrigues giant tortoise was chosen to be the Aldabra giant tortoise (Aldabrachelys gigantea) of the Seychelles, which is roughly similar in size, though very different in body form.

Extinction At the time of the arrival of human settlers, dense giant tortoise herds of many thousands were reported on Rodrigues. Typically for isolated island species, they were reported to have been friendly, curious, and unafraid of humans. However, in the ensuing years, massive harvesting and exporting for food and the introduction of invasive species rapidly exterminated the giant tortoises. Tentative conservation efforts began in the 18th century, with the French Governor Mahé de Labourdonnais attempting to legislate against the "tortoise plundering" of Rodrigues. However, the wholesale slaughter continued. Hundreds of thousands were loaded into ships' holds for food, or to be transported to Mauritius where they were burnt for fat and oil. Due to their unusually thin shells, many died from crushing as they were densely stacked in the holds of ships. In the final years, only smaller specimens were found, lingering in isolated mountainous refuges inland. A surviving giant tortoise was reported on the island in 1795, found at the bottom of a ravine. As late as 1802, there is a mention of survivors reportedly being killed in the large fires used to clear the island's vegetation for agriculture, but it is not clear which one of the two Rodrigues species these were, and which one survived the longest.

References

Further reading Suckow, A. (1798). Anfangsgründe der theoretischen und angewandten Naturgeschichte der Thiere. Dritter Theil. Von den Amphibien. Leipzig: Weidmannischen Buchhandlung. 298 pp. (Testudo indica vosmaeri, new subspecies, p. 57). (in German).

External links

Rodrigues Saddle-backed Tortoise - The Extinction Website

Illustrations

Worked examples

Example 1 — a first encounter with Saddle-backed Rodrigues giant tortoise

Start with the simplest possible case. Write down what Saddle-backed Rodrigues giant tortoise 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 Saddle-backed Rodrigues giant tortoise 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 Saddle-backed Rodrigues giant tortoise 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 Saddle-backed Rodrigues giant tortoise

In research: Saddle-backed Rodrigues giant tortoise 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 Saddle-backed Rodrigues giant tortoise 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: Saddle-backed Rodrigues giant tortoise is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cylindraspis, Extinct turtles, Fauna of Rodrigues, so understanding it makes those chapters shorter.
In everyday life: Look for Saddle-backed Rodrigues giant tortoise 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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Frequently asked questions

What is Saddle-backed Rodrigues giant tortoise in simple terms?

The saddle-backed Rodrigues giant tortoise (Cylindraspis vosmaeri) is an extinct species of giant tortoise in the family Testudinidae. The species was endemic to Rodrigues.

Why does Saddle-backed Rodrigues giant tortoise 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 Saddle-backed Rodrigues giant tortoise?

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 Saddle-backed Rodrigues giant tortoise.