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Friday, August 16, 2013

Giant-leaved Fig (Ficus lutea)

Family Moraceae
 Description

Ficus lutea is a large, briefly-deciduous tree, capable of growing to 25 m in height. Its large, spreading crown can span 30 to 45 m in width. This spreading habit coupled with an often short and buttressed trunk can help in revealing the tree's identity from a distance. Under forest conditions, however, it tends towards a taller growth habit with a somewhat narrower spread. The species also has the ability to become a strangler and is often encountered assuming this habit.

The bark is relatively smooth-textured and dark grey to brown in colour. Branches may be finely hairy when young, becoming smooth with age. The lovely smooth, glossy leaves are very large in size, as the common name would suggest, and are quite distinctive, ranging from 130 to 430 mm in length and up to 200 mm in width. They are held towards the ends of the branches, are ovate to elliptic or obovate, and exhibit clear yellow veining. The attractive bronze stipules effectively sheath the terminal buds. The leaf margins are entire and the stout leaf stalks measure from 25 to 150 mm in length.

The syconia ('fruits'), borne most often between June and October, are crowded towards the ends of the branchlets in the leaf axils or below the leaves. They measure 15 to 30 mm in diameter, are sessile (stalkless) and are densely hairy to smooth. Although exhibiting many distinctive characters, Ficus lutea can superficially resemble F. trichopoda (swamp fig) with which there is some distribution overlap. The latter is distinguished in having 7 to 11 pairs of lateral veins in the leaves as opposed to the 6 to 8 evident in F. lutea, and stalked fruit, the fruit of F. lutea being sessile (Coates Palgrave 2002).

 Distribution

The giant-leaved fig is a widely distributed species. It occurs naturally in South Africa, Mozambique and Zimbabwe, into tropical and west Africa, as well as in Madagascar, the Comores and Seychelles (Burrows & Burrows 2003). It is a commonly cultivated species and has become naturalized in areas previously outside its distribution range. The habitats in which it occurs are varied, ranging from coastal and riverine forest to evergreen forest and woodland. The species is seen to occur from sea level to 1 000 m and, in some areas up to 1 800 m above sea level (Burrows & Burrows 2003), representing a notable altitudinal range. It tends to thrive in the warm, moist and frost-free areas within its range, and under such conditions can be a very fast grower indeed (Palmer & Pitman 1972).

 Ecology

From an ecological perspective, the giant-leaved fig is both fascinating and remarkable. Fig trees in general have a well-founded reputation for being virtual wildlife magnets and this species proudly upholds this reputation. A wide variety of frugivorous (fruit-eating) birds are attracted by the promise of a good meal in the form of the abundant fleshy figs produced by the tree. Numerous insectivorous bird species join the feast, feeding on the rich insect life that is drawn to the figs. In addition, the figs are relished by a range of mammals that include bats, duikers and Vervet and Samango monkeys, as well as baboons in areas where they coexist with F. lutea (Nichols 2004. pers. comm.). The masses of fallen figs also support much decomposition-related activity. The seed of the tree is effectively dispersed by many of these animals. Seed may be carried considerable distances by birds, often being deposited in the forks of trees and in the cracks of buildings and the like and here the hemi-epiphytic (and often 'strangling') nature of this species is evident.

Pollination represents an amazing and intriguing aspect of fig life. Figs rely entirely on specific fig wasps for effecting pollination (the pollinator species of F. lutea being Allotriozoon heterandromorphum), these wasps, in turn, being totally reliant on the figs for meeting their reproductive requirements, a relationship referred to as obligate mutualism.
 Uses and cultural aspects

The giant-leaved fig is well known for its horticultural value and is cultivated in various regions in Africa (Burrows & Burrows 2003). In the wetter, warm eastern parts of South Africa, it is a popular street tree and is a common feature in parks and other urban open spaces. Its use in horticulture has attached to it some economic value also, as is evident in the nursery trade. The bark has been used traditionally in the production of twine and the plant sap (latex) is used for bird lime (Pooley 1993). The use of the bark in the production of bark cloth has been recorded in Mozambique, this cloth being a commodity in the region (Burrows & Burrows 2003). In West Africa the fruits are known to be consumed by people, and in Angola the wood of the tree is used for the making of bowls (Burrows & Burrows 2003).