biology

Pinus nigra

Pinus nigra 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 Pinus nigra rather than just read about it. In short: Pinus nigra, the European black pine, is a moderately variable species of pine, occurring across Southern Europe from the Iberian Peninsula and Lower Austria to the eastern Mediterranean, on the Anatolian peninsula of Turkey, Corsica and Cyprus, as well as Crimea and in the high mountains of Northwest Africa. Several of the regional populations have their own names, including Austrian pine, Corsican pine, Crimean pi…

Key takeaways

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

Reference excerpt

Pinus nigra, the European black pine, is a moderately variable species of pine, occurring across Southern Europe from the Iberian Peninsula and Lower Austria to the eastern Mediterranean, on the Anatolian peninsula of Turkey, Corsica and Cyprus, as well as Crimea and in the high mountains of Northwest Africa. Several of the regional populations have their own names, including Austrian pine, Corsican pine, Crimean pine, and Pyreneean pine.

Description Pinus nigra is a large coniferous evergreen tree, growing to 20–55 m (66–180 ft) high at maturity and spreading to 6 to 12 m (20 to 39 ft) wide. The bark is grey to yellow-brown, and is widely split by flaking fissures into scaly plates, becoming increasingly fissured with age. The leaves ('needles') are (4–)10–18 cm long, thinner and more flexible in western populations. The ovulate and pollen cones appear from May to June. The mature seed cones are 5–10 cm (2–4 in) (rarely to 11 cm/4 in) long, with rounded scales; they ripen from green to pale grey-buff or yellow-buff in September to November, about 18 months after pollination. The seeds are dark grey, 6–8 mm (1⁄4–5⁄16 in) long, with a yellow-buff wing 20–25 mm (3⁄4–1 in) long; they are wind-dispersed when the cones open from December to April. Maturity is reached at 15–40 years; large seed crops are produced at 2–5 year intervals. Pinus nigra is moderately fast growing, at about 30–70 cm (12–28 in) per year. It usually has a rounded conic form, that becomes irregular with age. The tree can be long-lived, with some trees over 500 years old. Multiple pests can damage P. nigra, including the bark beetle Tomicus piniperda.

Taxonomy The species is divided into two subspecies, each further subdivided into three varieties. Some authorities (see below) treat several of the varieties at subspecific rank, but this "reflects a long-standing European tradition of endless splitting more than sound taxonomy", as the distinctions between the taxa are small.

Subspecies P. nigra subsp. nigra in the east of the range, from Austria, northeast and central Italy, east to the Crimea and Turkey. Needles stout, rigid, 1.5–2 mm (1⁄16–3⁄32 in) diameter, with 3–6 layers of thick-walled hypodermal cells. P. nigra subsp. nigra var. nigra (syn. Pinus nigra var. austriaca, Pinus nigra subsp. dalmatica) (Austrian pine): Austria, Balkans (except southern Greece). P. nigra subsp. nigra var. caramanica (Turkish black pine): Turkey, Cyprus, southern Greece. P. nigra subsp. nigra var. pallasiana (syn. Pinus nigra subsp. pallasiana) (Crimean pine): Crimea, Cyprus. P. nigra subsp. salzmannii in the west of the range, from southern Italy to southern France, Spain and North Africa. Needles slender, more flexible, 0.8–1.5 mm (1⁄32–1⁄16 in) diameter, with 1–2 layers of thin-walled hypodermal cells. P. nigra subsp. salzmannii var. salzmannii (Pyrenean pine): Pyrenees, Southern France, Northern Spain. P. nigra subsp. salzmannii var. corsicana (syn. Pinus nigra subsp. laricio, Pinus nigra var. maritima) (Corsican pine): Corsica, Sicily, Southern Italy. P. nigra subsp. salzmannii var. mauretanica (Atlas Mountains black pine): Morocco, Algeria.

The Flora Europaea, followed by the Plants of the World Online database and the Gymnosperm Database, follows a more splitting approach with five subspecies and one variety:

Pinus nigra subsp. dalmatica (Vis.) Franco (synonyms P. dalmatica Vis., P. nigra var. dalmatica (Vis.) Businský, P. nigra f. leucodermoides Fukarek & M.Nikolic). Endemic to Croatia, where it is found on the islands of Brač, Hvar, and Korčula and the Pelješac peninsula. The IUCN Red List assessed it as endangered. Pinus nigra subsp. laricio Palib. ex Maire (synonyms P. altissima Carrière, P. italica Herter, P. karamana Mast., P. laricio Poir., P. nigra var. calabrica (Loudon) C.K.Schneid., P. nigra var. corsicana (Loudon) Hyl., P. nigra var. maritima (Aiton) Melville, P. sylvestris var. maritima Aiton) – Corsican Pine. Native to Corsica, Sicily, and the southern Apennines in Calabria. The IUCN Red List assesses the subspecies as least-concern. Pinus nigra subsp. nigra eastern Austria to the Balkan Peninsula – Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Greece, Montenegro, North Macedonia, Romania, Serbia, and Slovenia. Pinus nigra subsp. pallasiana (Lamb.) Holmboe (synonyms P. fenzleyi Antoine & Kotschy ex Carrière, P. nigra subsp. caramanica (Loudon) Businský, P. pallasiana Lamb., P. pontica K.Koch, P. taurica (Loudon) Steud.) Native to Cyprus, the East Aegean Islands, Crimean Peninsula, North Caucasus, and European and Asiatic Turkey. Pinus nigra subsp. salzmannii (Dunal) Franco (synonyms P. nigra var. mauretanica Maire & Peyerimh., P. nigra var. 'monspeliensis (Lavallée) Slavin, P. pyrenaica Lapeyr., P. salzmannii Dunal) – south-central France (Cévennes forest) to the Pyrenees, Spain, northern Morocco (Rif Mountains), and Algeria (Hodna Mountains). Pinus nigra f. seneriana (Saatçioglu) Kandemir & Mataraci – northwestern Turkey. Pinus nigra var. yaltirikiana Alptekin – northern Turkey.

Distribution and habitat Pinus nigra is a tree of the Mediterranean forests, woodlands, and scrub biome. The majority of the range is in Turkey. It is found in the higher elevations of the South Apennine mixed montane forests ecoregion in southern Italy and the Tyrrhenian-Adriatic sclerophyllous and mixed forests ecoregion in Sicily. There are remnant populations in the Mediterranean conifer and mixed forests ecoregion of northwestern Africa, specifically in the Rif Mountains of Morocco and Hodna Mountains of Algeria. It is found at elevations ranging from sea level to 2,000 m (6,600 ft), most commonly from 250–1,600 m (820–5,250 ft). Several of the varieties have distinct English names. It needs full sun to grow well, is intolerant of shade, and is resistant to snow and ice damage.

Oldest tree

The world's oldest black pine, located in the Banaz district of Uşak, Turkey, is estimated to be 1,000 years old. It has a height of 11 m (36 ft), a diameter of 3 m (10 ft) and a circumference of 9.60 m (31+1⁄2 ft).

Ecology In Mediterranean Europe and the Anatolian Peninsula (Asia Minor), trees usually associated with this species include Scots pine (Pinus sylvestris), Serbian spruce (Picea omorika), Bosnian pine (Pinus heldreichii), Norway spruce (Picea abies), Taurus cedar (Cedrus libani), European silver fir (Abies alba) and related firs. Several species of juniper (Juniperus spp.), and various broadleaf trees are associates.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Pinus nigra

Start with the simplest possible case. Write down what Pinus nigra 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 Pinus nigra 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 Pinus nigra 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 Pinus nigra

In research: Pinus nigra 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 Pinus nigra 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: Pinus nigra is common in secondary-school and first-year university syllabi. It links to neighbouring topics Drought-tolerant trees, Flora of North Africa, Flora of Western Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Pinus nigra 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 Pinus nigra in 20 minutes

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

Frequently asked questions

What is Pinus nigra in simple terms?

Why does Pinus nigra 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 Pinus nigra?

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 Pinus nigra.