Adansonia grandidieri

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Adansonia grandidieri
Adansonia grandidieri04.jpg
CITES Appendix II (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malvales
Family: Malvaceae
Genus: Adansonia
Species:
A. grandidieri
Binomial name
Adansonia grandidieri
Baill., 1888

Adansonia grandidieri is the biggest and most famous of Madagascar's six species of baobabs. It is sometimes known as Grandidier's baobab or the giant baobab. In French it is called Baobab malgache. The local name is renala or reniala (from Malagasy : reny ala, meaning "mother of the forest"). [3] [4] This tree is endemic to the island of Madagascar, where it is an endangered species threatened by the encroachment of agricultural land. This is the tree found at the Avenue of the Baobabs.

Contents

Description

Grandidier's baobabs have massive, cylindrical, thick trunks, up to three meters across, covered with smooth, reddish-grey bark. [5] They can reach 25 to 30 m (82 to 98 ft) in height. [6] The crown is flat-topped, with horizontal main branches.

Leaves

Leaves are palmately compound, typically with 9 to 11 leaflets. This is the only species of baobab with leaflets that are blueish-green and that are densely covered with star-shaped hairs. [5]

Flowers

Flowering occurs during the dry season, from May to August, before leaves appear. Buds are erect, rounded and dark brown. [5] The flowers are made up of 5 (sometimes 3) calyx lobes that are bent back and twisted at the base of the flower. The lobes are fused at the base forming an open cup about 1 cm deep. Petals are white, aging to yellow, up to 20 mm long and about 5 times as long as broad. The flowers have a white central tube (staminal tube) that is up to 16 mm long and is made up of fused stalks of stamens (filaments). 600 – 700 unfused filaments up to 6.5 cm long spread out from the top of the staminal tube. A densely hairy ovary is enclosed in the staminal tube, and a long style tipped with a white or pinkish stigma emerges from the filaments.

Fruits and seeds

The fruits are large, dry and rounded to ovoid. They have a hard shell 2 – 4.5 mm thick and are covered with dense reddish-brown hairs. They contain large (12-20 mm long) kidney-shaped seeds [5] within an edible pulp. [7]

Range and habitat

This baobab occurs in south-western Madagascar, between Lac Ihotry (near Morombe) and Bereboka. [5] Grandidier's baobab used to inhabit dry, deciduous forest, especially near seasonal rivers or lakes. However, today it is mainly found in open, agricultural land or degraded scrubland. [5]

Life cycle and ecology

Bark of a young tree Bark Adansonia grandidieri.jpg
Bark of a young tree

The long-lived Grandidier's baobab is in leaf from October to May, and flowers between May and August. [5] The flowers, said to smell of sour watermelon, open just before or soon after dusk, and all the pollen is released during the first night. [5] The tree is pollinated by nocturnal mammals, such as fork-marked lemurs, and insects like the Hawk Moth. The lemurs move through the canopies, inserting their snouts into the white flowers and licking nectar from the petal bases, resulting in pollen being deposited in the lemurs' faces, whereas the moth is slightly more effective at pollination because it is able to fly from tree to tree with most of its body covered in pollen. [7]

The species bears ripe fruit in November and December. [5] Unlike the baobabs of Africa and Australia, it appears that the seeds of the tasty fruit are not dispersed by animals. Lemurs are the only living animals on Madagascar that are capable of acting as seed dispersers, yet seed dispersal by lemurs has never been documented. [5] In the past, however, this could have been very different. There are several species that have gone extinct since human colonization of the island (1,500 to 2,000 years ago) that could very likely have been dispersers of the seeds. This includes species of primates that were thought to be similar to baboons, and the heaviest bird that ever lived, the elephant bird, which had a powerful beak that could have opened large fruit. [5] Today, water may be the means by which the seeds are dispersed. [5]

Lack of water can sometimes be a problem for plants in Madagascar. It appears that the baobab overcomes this by storing water within the fibrous wood of the trunk, as the tree's diameter fluctuates with rainfall. [5]

Taxonomy

Adansonia grandidieri was first described and published by botanist Henri Ernest Baillon in A.Grandidier's, Hist. Phys. Madagascar: tables 79e and 79a in 1888. [8] The genus Adansonia honours the French explorer and botanist, Michel Adanson (1727–1806). [5] The species name grandidieri honours the French botanist and explorer Alfred Grandidier (1836–1921). [9] All species of Adansonia except A. digitata are diploid. [10] The genus Adansonia is in the subfamily Bombacoideae, within the family Malvaceae in the order Malvales. Adansonia grandidieri is classified in section Brevitubae with the close relative Adansonia suarezensis . These are baobabs that are large trees with ovoid flower buds set on short, erect stalks. [5]

Uses

This is the most widely used of the Malagasy baobabs. [4] The seeds and the vitamin C-rich fruit pulp are eaten fresh, and cooking oil is extracted from the oil-rich seeds. The fruit is either collected from the ground, or wooden pegs are hammered into the trunk so the tree can be climbed to collect the fruit. [5] The thick bark of the baobab is composed of tough long fibers that can be used to make ropes, and the majority of trees bear scars from where the bark was cut from ground level to about two meters to obtain this material. [5] The spongy wood consists of sheets of fibre that are collected from dead or living trees, dried in the sun and sold for thatch. [5] Most of these varied uses do not involve the tree being killed, and thus are unlikely to pose a great threat to the baobab.

Threats and conservation

Avenue of the Baobabs, Madagascar Adansonia grandidieri02.jpg
Avenue of the Baobabs, Madagascar

Grandidier's baobab is classified as endangered by the IUCN Red List 2006. [1] Although it is the most heavily exploited of all the Malagasy baobabs, [5] the greatest threat is the transformation of its forest habitat into agricultural land. Within these disturbed habitats, there is a noticeable lack of young trees. Fires, seed predation, competition from weeds, and an altered physical environment might be affecting the ability of the Madagascar baobab to reproduce, [5] which may have devastating consequences for its survival. In 2003 the President of Madagascar vowed to triple the number of protected areas, [11] a measure which may benefit the Grandidier's baobab. The prominent group of Grandidier's baobabs that make up the Avenue of the Baobabs has been a center of local conservation efforts, and was granted temporary protected status in July 2007 by the Ministry of Environment, Water and Forests – a step toward making it Madagascar's first natural monument. [12]

Related Research Articles

<span class="mw-page-title-main">Bombacaceae</span> Family of flowering plants

Bombacaceae were long recognised as a family of flowering plants or Angiospermae. The family name was based on the type genus Bombax. As is true for many botanical names, circumscription and status of the taxon has varied with taxonomic point of view, and currently the preference is to transfer most of the erstwhile family Bombacaceae to the subfamily Bombacoideae within the family Malvaceae in the order Malvales. The rest of the family were transferred to other taxa, notably the new family Durionaceae. Irrespective of current taxonomic status, many of the species originally included in the Bombacaceae are of considerable ecological, historical, horticultural, and economic importance, such as balsa, kapok, baobab and durian.

<i>Adansonia</i> Genus of plants known as baobab

Adansonia is a genus made up of eight species of medium-to-large deciduous trees known as baobabs. They are placed in the Malvaceae family, subfamily Bombacoideae. They are native to Madagascar, mainland Africa, and Australia. The trees have also been introduced to other regions such as Asia. The generic name honours Michel Adanson, the French naturalist and explorer who described Adansonia digitata. The baobab is also known as the "upside down tree", a name that originates from several myths. They are among the most long-lived of vascular plants and have large flowers that are reproductive for a maximum of 15 hours. The flowers open around dusk, opening so quickly that movement can be detected by the naked eye, and are faded by the next morning. The fruits are large, oval to round and berry-like and hold kidney-shaped seeds in a dry, pulpy matrix.

<i>Adansonia gregorii</i> Species of tree

Adansonia gregorii, commonly known as the boab and also known by a number of other names, is a tree in the family Malvaceae, endemic to the northern regions of Western Australia and the Northern Territory of Australia.

<i>Adansonia digitata</i> Species of plant

Adansonia digitata, the African baobab, is the most widespread tree species of the genus Adansonia, the baobabs, and is native to the African continent and the southern Arabian Peninsula. These are long-lived pachycauls; radiocarbon dating has shown some individuals to be over 2,000 years old. They are typically found in dry, hot savannas of sub-Saharan Africa, where they dominate the landscape and reveal the presence of a watercourse from afar. They have traditionally been valued as sources of food, water, health remedies or places of shelter and are a key food source for many animals. They are steeped in legend and superstition. In recent years, many of the largest, oldest trees have died, for unknown reasons. Common names for the baobab include monkey-bread tree, upside-down tree, and cream of tartar tree.

<i>Adansonia madagascariensis</i> Species of flowering plant

Adansonia madagascariensis or Madagascar baobab is a small to large deciduous tree in the family Malvaceae. It is one of six species of baobab endemic to Madagascar, where it occurs in the Madagascar dry deciduous forests.

<i>Adansonia rubrostipa</i> Species of flowering plant

Adansonia rubrostipa, commonly known as fony baobab, is a deciduous tree in the Malvaceae family. Of eight species of baobab currently recognized, six are indigenous to Madagascar, including fony baobab. It is endemic to western Madagascar, found in Baie de Baly National Park, south. It is associated with well-drained soils and is found in dry and spiny forests. It occurs in the following protected areas: Amoron'i Onilahy, Baie de Baly, Menabe Antimena, Mikea, Namoroka, Ranobe PK 32, Tsimanampesotse, Tsimembo Manambolomaty, Tsinjoriake.

<i>Adansonia perrieri</i> Species of flowering plant

Adansonia perrieri, or Perrier's baobab, is a critically endangered species of deciduous tree, in the genus Adansonia. This species is endemic to northern Madagascar. It has been documented in only 10 locations, including the Ankarana, Ampasindava, Loky Manambato and Montagne d'Ambre protected areas. Most populations, however, are outside of protected areas. Each location has few individuals. With an estimated population of fewer than 250 mature individuals and ongoing habitat decline due to fire and cutting for charcoal and timber or clearing for mining, this species has been assessed by IUCN as Critically Endangered. There are three species of baobab found in northern Madagascar, all sharing the common name "bozy".

<i>Adansonia suarezensis</i> Species of flowering plant

Adansonia suarezensis, the Suarez baobab, is an endangered species of Adansonia endemic to Madagascar. It is locally called "bozy", the common name used for all baobabs in northern Madagascar.

<i>Adansonia za</i> Species of flowering plant

Adansonia za is a species of baobab in the genus Adansonia of the family Malvaceae. It was originally named in French as anadzahé. Common names in Malagasy include bojy, boringy, bozy, bozybe, ringy, and za, the last of which gives the plant its specific epithet. Eight Adansonia species are recognized, with six endemic to Madagascar. Adansonia za is the most widespread of the Madagascar endemics.

<span class="mw-page-title-main">Madagascan fruit bat</span> Species of bat

The Madagascan fruit bat is a species of bat in the family Pteropodidae. It is endemic to Madagascar and is listed as "Vulnerable" by the IUCN because it is hunted as bushmeat.

<span class="mw-page-title-main">Avenue of the Baobabs</span> Protected area in Madagascar

The Avenue of the Baobabs, or Alley of the Baobabs, is a prominent group of Grandidier's baobabs lining the unpaved Road No.8 between Morondava and Belon'i Tsiribihina in the Menabe region of western Madagascar. Its striking landscape draws travelers from around the world, making it one of the most visited locations in the region. It has been a center of local conservation efforts, and was granted temporary protected status in July 2007 by the Ministry of Environment, Water and Forestry – a step toward making it Madagascar's first natural monument.

<span class="mw-page-title-main">Tsimanampetsotsa National Park</span> National park in Madagascar

Tsimanampetsotsa National Park also spelt Tsimanampetsotse, and known as Tsimanampetsotsa Nature Reserve is a 432 km2national park on the south-west coast of Madagascar in the region Atsimo-Andrefana. The park is 90 kilometres (56 mi) south of Toliara and 950 kilometres (590 mi) south of the capital, Antananarivo. Route Nationales (RN) 10 to Faux Cap passes the park and the nearest airport is at Toliara. The national park contains and is named after Lake Tsimanampetsotsa.

<i>Xanthopan</i> Genus of moths

Xanthopan is a monotypic genus of sphinx moth, with Xanthopan morganii, commonly called Morgan's sphinx moth, as its sole species. It is a very large sphinx moth from Southern Africa and Madagascar. Little is known about its biology, though the adults have been found to visit orchids and are one of the main pollinators of several of the Madagascar endemic baobab (Adansonia) species, Adansonia perrieri or Perrier's baobab.

<i>Pachylemur</i> Extinct genus of lemurs

Pachylemur is an extinct, giant lemur most closely related to the ruffed lemurs of genus Varecia. Two species are known, Pachylemur insignis and Pachylemur jullyi, although there is some doubt as to whether or not they may actually be the same species. Pachylemur is sometimes referred to as the giant ruffed lemur, because although it and the living ruffed lemurs had similar teeth and skeletons, Pachylemur was more robust and as much as three to four times larger. DNA studies have confirmed a sister group relationship between these two types of lemur. Like living ruffed lemurs, Pachylemur specialized in eating fruit, and was therefore an important seed disperser, possibly for tree species with seeds too large for even ruffed lemurs to swallow. In the spiny thickets of southwestern Madagascar, they were also likely to have dispersed seeds evolved to attach to fur and be carried away. Unlike ruffed lemurs, the fore- and hindlimbs of Pachylemur were nearly the same length, and therefore it was likely to be a slow, deliberate climber. However, both used hindlimb suspension to reach fruit on small branches below them.

<span class="mw-page-title-main">Subfossil lemur</span> Lemurs from Madagascar that are represented by recent (subfossil) remains

Subfossil lemurs are lemurs from Madagascar that are represented by recent (subfossil) remains dating from nearly 26,000 years ago to approximately 560 years ago. They include both extant and extinct species, although the term more frequently refers to the extinct giant lemurs. The diversity of subfossil lemur communities was greater than that of present-day lemur communities, ranging to as high as 20 or more species per location, compared with 10 to 12 species today. Extinct species are estimated to have ranged in size from slightly over 10 kg (22 lb) to roughly 160 kg (350 lb). Even the subfossil remains of living species are larger and more robust than the skeletal remains of modern specimens. The subfossil sites found around most of the island demonstrate that most giant lemurs had wide distributions and that ranges of living species have contracted significantly since the arrival of humans.

<i>Coelonia solani</i> Species of moth

Coelonia solani is a moth of the family Sphingidae. It is known from Mauritius, Réunion, Madagascar and the Comoro Islands. It is a pollinator of some species of baobab in Madagascar, including Adansonia za.

<span class="mw-page-title-main">Kirindy Forest</span> Nature reserve in Madagascar

The Kirindy Forest is a private nature reserve situated in western Madagascar, about 50 km northeast of the town of Morondava, near Ambivy. The forest reserve falls within the boundaries of the Kirindy Mitea National Park, which spreads further to the south.

<i>Aldabrachelys grandidieri</i> Extinct species of tortoise

Aldabrachelys grandidieri, or Grandidier's giant tortoise, is an extinct species of tortoise that was endemic to Madagascar. Mitochondrial DNA extracted from subfossil bone confirm that it is a distinct species.

Adansonia kilima, is the name given in 2012 to certain upland populations of baobab trees of southern and eastern Africa that are now considered to be synonymous with Adansonia digitata It has overlapping geographic range with A. digitata, is tetraploid, and apparently the same species as the tetraploid A. digitata.

<i>Brexia</i> Shrub or tree genus

Brexia is a plant genus assigned to the Celastraceae. It is a dense evergreen shrub or small tree of usually around 5 m high, with alternately set, simple, leathery leaves with a short leaf stem and lanceolate to inverted egg-shaped leaf blades. The pentamerous flowers occur in cymes. The petals are greenish white, the stamens are alternating with wide, incised staminodes. The superior ovary develops in a long-ribbed fruit. Brexia naturally grows on the coast of East Africa, on Madagascar, the Comoros and Seychelles. Opinions differ about the number of species in Brexia. Sometimes the genus is regarded monotypic, B. madagascariensis being a species with a large variability, but other authors distinguish as many as twelve species. Common names for B. madagascariensis include jobiapototra, tsimiranjana, tsivavena, vahilava, voalava, voankatanana, voantalanina, voatalanina and votalanina, and mfukufuku (Swahili), mfurugudu and bwa kato (Seychelles).

References

This article incorporates text from the ARKive fact-file "Adansonia grandidieri" under the Creative Commons Attribution-ShareAlike 3.0 Unported License and the GFDL .

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