Old growth near Laguna Fria, Alerce Andino National Park, Chile [Renzo Motta, Mar-2000].

Crown of an old tree [Peter Nelson, Jun-2006].

A surviving tree in a logged area [Rick Fencl].

Valdivian rain forest, Alerce Andino National Park, Chile [Renzo Motta, Mar-2000].

Foliage on an ornamental specimen [C.J. Earle, May-1999].

Base of a 57 m tall tree in Parque Nacional Los Alerces, Chubut, Argentina [Marcelo Fabián Cano].

Trunk of an old tree in Parque Pumalín, Chile [Marcelo Fabián Cano].

Stand of old trees in Chile [Peter Nelson, Jun-2006].

Fitzroya cupressoides

(Molina) Johnston 1924

Common Names

Alerce [Spanish] (Dallimore et al. 1967); in its distribution area, Lahuan is the aboriginal name.

Taxonomic notes

The sole species in Fitzroya Lindl. 1851 (syn: Cupresstellata J. Nelson 1866). Synonyms include:
- Pinus cupressoides Molina 1782;
- Abies cupressoides (Molina) Poir. 1805;
- Thuja tetragona Hooker 1844;
- Libocedrus tetragona (Hook.) Endl. 1847;
- Fitzroya patagonica Hook. f. ex Lindl. 1851; and
- Cupresstellata patagonica (Hook. f.) J. Nelson 1866. (Farjon 1998).

Description

Fitzroya: Evergreen, dioecious tree. Branches not whorled, shoots angular, leaves scale-like, in whorls of 3. Female flowers in cone-like inflorescences, composed of 9 scales in whorls of 3, in 3 alternating whorls; the lowest whorl small and sterile; the middle whorl larger and sterile or with a single 2-winged seed to each scale; the upper whorl fertile, each scale bearing 2-6 two- or three-winged seeds. Cones globose, 6-8 mm across, ripening in the first year; fertile scales with a three-sided mucro at the apex. Seeds 2-6 on each fertile scale, ovate, 2(3)-winged. Cotyledons 2. n =11 (Dallimore et al. 1967, Farjon 1998).

F. cupressoides: Trees to 45 m tall and 300 cm dbh. Bark reddish, furrowed, peeling off in strips. Branchlets pendulous; leaves in whorls of three, 3.5 mm long, minutely incurved with 2 white bands beneath (Britannica Online, "Alerce", Farjon 1998). "Leaves persisting several years, in alternating whorls of 3, their bases flattened and decurrent, the free part spreading, obovate or oblong lanceolate, about 1/8 in. long with a minute incurved point, upper surface concave with 2 sunken white stomatic bands, lower surface convex with a broad green midrib, on each side of which is a white band of stomata extending from the base to near the apex. Male and female strobili on the same or on different trees, sometimes hermaphrodite. Male strobili solitary in the leaf axils near the points of the shoots, cylindrical with 15-24 stamens in whorls of 3. Female strobili solitary, about 1/4 in. in diameter, on short, stalk-like, leafy shoots. Cones woody, 1/4 - 1/3 in. in diameter, ripening the first year, composed of 9 scales in 3 whorls, the lowest minute and sterile, the middle empty or each bearing a 2-winged seed, the upper scales the largest and bearing 2- or 3-winged seeds, the apex of the cone terminating in gland-like, resin-secreting bodies about 1/8 in. long, which exhale a fragrant odour. Cotyledons 2. Hermaphrodite strobili have a larger number of scales" (Dallimore et al. 1967).

Range

S Chile & S Argentina "from the coast range south of Valdivia, and on Chiloe Island, to the Andes, between 41°S and 43°S" (Dallimore et al. 1967).

In Argentina, alerce grows on mountain slopes and lake shores, at elevations of 300 to 900 meters. Summer average temperatures are 13-16°C. Winter average temperatures vary from 2-4°C. The area receives 2000-4000 mm. of annual precipitation. In Chile, temperatures can be a bit higher at lower elevations, and rainfall is as high as 6000 mm (Marcelo Fabián Cano, e-mail 22-Dec-2003).

Curiously, although the tree grows in virtual rainforest, it is dependent on catastrophic fire in order to regenerate stands; the current widespread decline observed among remnant populations may be due in good measure to fire suppression (Lara et al. 1999).

Big Tree

The biggest officially recorded specimen in Argentina is 57 meters high, 2.20 meters dbh, and 2600 years old (see pictures at left). It is located near Puerto Sagrario, on the northern branch of Lake Menendez, Los Alerces National Park. This tree is very well known in the area, and there are regular tours to visit the site. Guardaparques (park rangers) state that taller trees (60-70 meters) can be found on the southern branch of Lake Menendez, but that area is restricted to visitors and there aren't trails or roads to get there. Fitzroya is probably the tallest tree in South America (Marcelo Fabián Cano, e-mail 22-Dec-2003).

Darwin saw specimens of up to 130 feet (39.6 m) in girth. A specimen 426 cm dbh is known from the Monumento De Los Alerzales Forest Reserve, Chile (International Dendrology Society Year Book 1991).

Oldest

A crossdated age of 3622 years for a specimen from Chile collected by Lara and Villalba in 1993 (Lara and Villalba 1993, Brown 1996). This gives it the second-greatest fully verified age recorded for any living tree.

Dendrochronology

Early work (Boninsegna and Holmes 1985) established it as the most long-lived species known in South America. Soon after, it was been used to produce a 3622-year reconstruction of mean summer temperatures for southern South America (Lara and Villalba 1993). It has also been used to date glacier fluctuations in Argentina (Villalba et al. 1990). Recent work has continued to push the chronology back using subfossil wood; the Fitzroya chronology currently (Wolodarsky-Franke et al. 2003) stands at 5,666 years, the longest tree-ring record for the southern hemisphere.

Ethnobotany

The reddish brown wood is lightweight, durable, easily worked on account of its straight grain and was formerly much used for shingles, furniture, cooperage, masts, and spars. However, all logging of this extraordinary tree (sometimes called the Sequoia of South America) was officially stopped in 1976 and today relatively few remaining big trees constitute a Chilean national treasure. It is increasingly often used as an ornamental: "It was introduced into cultivation in 1849 by William Lobb and again by Richard Pearce, the Veitchian collector, 10 years later. Although quite hardy in Britain, it is more often seen as a shrub than a tree, but specimens 40 ft. or more high are occasionally met with in the west of England and elsewhere. Probably the tallest is a tree at Killerton, Devon, 53 ft. high, with a girth of 6 ft., in 1964" (Dallimore et al. 1967).

Observations

Argentina has preserved outstanding forests of this rare giant in the Parque Nacional Los Alerces. In Chile, old growth stands of Fitzroya can be found in Parque Pumalín, north of Chaitín. Along the trail "El Alerzal" there are dozens of trees 50-70 meters tall and 200-300 cm dbh (Marcelo Fabián Cano, e-mail 22-Dec-2003).

Remarks

The alerce was originally named by Darwin for Captain Fitzroy of H.M.S. Beagle.

The species regenerates both vegetatively and from seed, with vegetative reproduction more common at high altitudes. Seedlings establish preferentially on sunny sites with a decaying wood substrate (Parker and Donoso 1993). This suggests that the species is adapted for gap regeneration following disturbance by storm or wind (rather than fire).

This species is fully protected under Appendix I of CITES (the Convention On International Trade In Endangered Species Of Wild Fauna And Flora (1973, revised 16-Apr-1993)).

A fossil species has been found in Oligocene sediments in Tasmania; thus Fitzroya joins most other Southern Conifer genera in showing Gondwanan affiliations (Hill and Whang 1996).

Citations

Boninsegna, J.A., Holmes, R.L. 1985. Fitzroya cupressoides yields 1534-year long South American chronology. Tree-Ring Bulletin 45:37-42. Available online at www.treeringsociety.org/TRBTRR/TRBvol45_37-42.pdf (accessed 2006.06.05).

Hill, R.S. and S.S. Whang. 1996. A new species of Fitzroya (Cupressaceae) from Oligocene sediments in north-western Tasmania. Australian Systematic Botany 9(6):867-875.
ABSTRACT: Vegetative twigs from Oligocene sediments in north-western Tasmania are assigned to a new fossil species of Fitzroya, F. tasmanensis. These twigs differ from extant F. cupressoides in leaf shape and stomatal orientation and morphology. This is the first fossil record of Fitzroya from outside the current range of the genus (South America). Previous fossil records of Fitzroya from South America are almost certainly erroneous. These fossils occur in sediments with leaves and cupules of Nothofagus subgenus Nothofagus, which is also restricted to South America today. This suggests that some current plant associations in southern South America provide good analogues for vegetation in Oligocene Tasmania.

Lara, A. and R. Villalba. 1993. A 3620-year temperature record from Fitzroya cupressoides tree rings in southern South America. Science 260: 1104-1106.

Lara, A., S. Fraver, J.C. Aravena, and A. Wolodarsky-Franke. 1999. Fire and the dynamics of Fitzroya cupressoides (alerce) forests of Chile's Cordillera Pelada. Ecoscience 6(1): 100-109.
ABSTRACT: Widespread mortality of Fitzroya cupressoides (alerce) is found throughout the Coastal Range of south-central Chile. The main explanations for tree mortality have been fire and climate change. In order to better understand the dynamics and mortality of Fitzroya in the Cordillera Pelada ('barren range', within the Coastal Range), we established four study plots (with varying degrees of Fitzroya mortality), from which we collected information on tree regeneration, age and size classes of living and dead trees, dates of fire scars from tree stumps, and radial growth rates. The abundance of seedlings and saplings in areas affected by recent, low-intensity fires indicates adequate regeneration of Fitzroya. Age class structures of adult Fitzroya trees from three of the stands show single-cohort populations, suggesting establishment after a stand-devastating disturbance. Fires from two stands were dated to years ranging between 1397 and 1943, indicating that fires have occurred repeatedly over the past 600 years. Tree growth increases immediately after fire. Based on the presence of burned snags, soil charcoal. single-cohort age structures, and numerous dated fire scars, we conclude that repealed fire is the main cause of widespread Fitzroya mortality in the Cordillera Pelada. Since the time of European settlement in southern Chile (ca.1750), fires have mainly been caused by Europeans; however, prior to that time, fires were probably caused by both lightning and native people that inhabited the area.

Parker, T. and C. Donoso. 1993. Natural regeneration of Fitzroya cupressoides in Chile and Argentina. Forest Ecology and Management 59(1-2): 63-85.

Villalba, R. et al. 1990. Climate, tree-ring, and glacial fluctuations in the Rio Frias Valley, Rio Negro, Argentina. Arctic and Alpine Research 22: 215-232.

Wolodarsky-Franke, Alexia, Antonio Lara and Emilio Cuq. 2003. Development of millennial Fitzroya cupressoides tree-ring chronologies in southern Chile. P. 49 in Programme with Abstracts, Fourth Annual Science Meeting, IAI CRN 03: The Assessment of Past, Present and Future Climate Variability from Treeline Environments. IANIGLA-CRICYT, Mendoza, Argentina, October 10-16, 2003.