Visiting South American temperate rainforests had always been on my wishlist, and recently I had the opportunity to go see some of these beautiful ecosystems in Chile. The opportunity arose when Rocio Urrutia, a researcher at the Universidad Austral de Chile in Valdivia, invited me to collaborate with her on a research project investigating the potential impacts of future climate change on temperate Chilean rainforest species (Figure 1). The focal species of the project is Alerce (Fitzroya cuppresoides), a conifer species often referred to as the “redwood of the south”. This magnificent tree is threatened by drought events, habitat destruction, and illegal logging, and Rocio and her colleagues are doing some fantastic work with the aim of promoting conservation of the trees and the forests that they occur in.
Upon my arrival in Validivia, I was immediately struck by the trees; Many of them seemed oddly familiar. On the way to the city from the airport my taxi drove past Chilean firetrees in full bloom (Embothrium coccineum, members of the Proteaceae), and magnificent southern beech trees (several Nothofagus species). I am particularly fond of species of the Proteaceae, mostly as a result of having grown up in South Africa where Protea, Leucospermum and Leucadendron are common features of the Fynbos flora (and also as a consequence of having studied the Fynbos flora for my dissertation).
One of the reasons for my trip to Chile was to participate in a discussion around the conservation of Alerce (Fitzroya cuppresoides). The mini conference was excellent (Figure 2). Among other things, I learned that even though the mean annual rainfall of Alerce Costera is over 4000 mm, Alerce trees can experience water stress during dry years as a consequence of the shallow, sandy soils. I was also highly impressed to learn that Fitzroya is the second longest living tree in the world (and I met the individual who dated the tree – the wonderful Antonio Lara!). I found this remarkable because these trees are quite different in appearance from the longest living trees in the world, the Bristlecone Pines. Alerce is tall, and flourishes in its native habit (moist temperate rainforest); in stark contrast the Bristlecone Pines appear to persevere rather than grow in arid mountains of North America. It really is unfortunate that these Alerce forests are threatened by climate change and deforestation. Overall the conference was incredible. It was fantastic to learn about the ongoing research at the University.
After the formalities of the conference were completed, my wonderful hosts, Rocio and Aldo took me and a few other colleagues (Jarmilla Pittermann and Jonathan Barichivich) on a field excursion to see the Alerce Costero forest (Figure 3). The forest is a two-hour drive from Valdivia and the site of much long-term monitoring and experimental research conducted by Rocio, Jonathan and their colleagues.
When we arrived I was awestruck to be standing amongst Nothofagus, Fitzroya, Pilgerodendron and Saxagothea. Incredible. My mind wandered to the last time I was standing in a mixed Nothofagus-conifer temperate forest. That time, I was travelling in New Zealand, but the similarities between the two forests are striking. Of course, the similarity between the southern hemisphere flora is no coincidence. The splitting of the ancient continent of Gondwana resulted in many shared families between the countries, including the Proteaceae, Myrtaceae, and Podocarpaceae. Antarctica was also a part of this supercontinent, as demonstrated by the abundance of fossils of tree species that occur on the cold continent. Remarkably, some of the fossil species still exist in the Alerce Costero temperate rainforest; I was amazed to see Nothofagus antarctica trees for the first time, surviving in a small drainage basin frequently exposed to very cold conditions (Figure 4). Its occurrence on Hoste Island (one of the southernmost islands in Chile) earns Nothofagus antarctica the wonderful distinction of being the southernmost tree on earth! Tangible, living evidence of these ancient geographic links between the southern hemisphere land masses.
After our walk through the forest and the research sites we retired to a small cafe located on the outskirts of the Alerce Costero National Park. Jonathan’s mother runs a tiny cafe where she provides warm refreshment in the form of coffee and baked goods (Figure 5). It was delightful. We crowded into the cozy, warm room and had an incredible lunch.
Finally, we decided to see the big Grandpa of the forest: the largest Alerce of the region (Figure 6). This tree is one of the few remaining large trees of the forest, with most of the large trees having been cut down in previous centuries for timber. It is incredible! It has a known diameter of at least 4m and is at least 2000 years old according to tree rings obtained by Antonio Lara (It is probably much older, since the inner core has rotted away with time). Jonathan mentioned that the sex of the tree is actually unknown (Fitzroya is dioecious, meaning that, like humans, individuals can have seperate sexes). However, they aim to find this information out later this year….and Jonathan suspects that the tree is actually the Grandma of the forest.
So far my experience of Chile has been wonderful, and I still have a week to go here. It is great to be among southern hemisphere trees again and to learn about more remarkable southern hemisphere forests!