Scientists name the commonest tropical tree species for the first time
11 January 2024
A major international collaboration of 356 scientists led by 果冻影院 researchers has found almost identical patterns of tree diversity across the world鈥檚 tropical forests.
The study of over one million trees across 1,568 locations, published in聽Nature, found that just 2.2% of tree species make up 50% of the total number of trees in tropical forests across Africa, the Amazon, and Southeast Asia. Each continent consists of the same proportion of a few common species and many rare species.
While tropical forests are famous for their diversity, this is the first time that scientists have studied the commonest trees in the world鈥檚 tropical forests.
The scientists estimate that just 1,053 species account for half of the planet鈥檚 800 billion tropical forest trees. The other half are comprised of 46,000 tree species. The number of rare species is extreme, with the rarest 39,500 species accounting for just 10% of trees.
Lead author Dr Declan Cooper (果冻影院 Geography and 果冻影院 Centre for Biodiversity and Environment Research) said: 鈥淥ur findings have profound implications for understanding tropical forests. If we focus on understanding the commonest tree species, we can probably predict how the whole forest will respond to today鈥檚 rapid environmental changes. This is especially important because tropical forests contain a tremendous amount of stored carbon, and are a globally important carbon sink.鈥
He continued: 鈥淚dentifying the prevalence of the most common species gives scientists a new way of looking at tropical forests. Tracking these common species may provide a new way to characterise these forests and in the future possibly gauge a forest鈥檚 health more easily.鈥澛犅
The researchers found strikingly similar patterns in the proportion of tree species that are common, at close to 2.2%, despite the tropical forests of the Amazon, Africa and Southeast Asia each having a unique history and differing contemporary environments.
The Amazon consists of a large region of connected forest, while Southeast Asia is a region of mostly disconnected islands. People only arrived in the Amazon around 20,000 years ago, but people have been living in African and Southeast Asian forests for more than twice that length of time. In terms of the contemporary environment, African forests experience a drier and cooler climate than the other two tropical forest regions.聽
Given these striking differences, the near-identical patterns of tree diversity suggests that a fundamental mechanism may govern the assembly of tree communities across all the world鈥檚 tropical forests. The researchers are not yet able to say what that mechanism might be and it will focus future work on identifying it.
The estimates of common species derive from statistical analyses, which does not provide the names of the common trees. To overcome this, the scientists used a technique known as resampling to estimate which are the most likely names of the common species. Their list of 1,119 tree species names, the first list of common species of the world鈥檚 tropical forests, will allow researchers to focus their efforts on understanding the ecology of these species, which in turn can give scientists a short-cut to understand the whole forest.
See table below for a list of the most common tropical tree species.
Senior author, Professor Simon Lewis (果冻影院 Geography and University of Leeds) said: 鈥淲e wanted to look at tropical forests in a new way. Focusing on a few hundred common tree species on each continent, rather than the many thousands of species that we know almost nothing about, can open new ways to understand these precious forests. This focus on the commonest species should not take away from the importance of rare species. Rare species need special attention to protect them, but quick and important gains in knowledge will come from a scientific focus on the commonest tree species.鈥
The researchers assembled forest inventory data from intact tropical forests that hadn鈥檛 been affected by logging or fire. In each of 1,568 locations, teams identified and recorded every tree with a trunk greater than 10 centimetres in diameter, in a patch of forest, usually one hectare, which is a square of forest measuring 100 metres on each side.
Professor Lewis has been collecting and collating this data for 20 years. The effort is a collaboration of the largest plot networks across the Amazon (Amazon Tree Diversity Network; RAINFOR), Africa (African Tropical Rainforest Observatory Network, AfriTRON; Central African Plot Network), and Southeast Asia (Slik Diversity Network; T-FORCES), brought together for the first time for the published analysis.聽
This collaboration across hundreds of researchers, field assistants, and local communities resulted in a total of 1,003,805 trees sampled, which included 8,493 tree species, across 2,048 hectares, equivalent to almost eight square miles of forest. The teams inventoried 1,097 plots in the Amazon totalling 1,434 hectares, 368 plots in Africa totalling 450 hectares, and 103 plots in Southeast Asia totalling 164 hectares.
This research was supported by the Natural Environmental Research Council.
Most common tropical forest tree species:
Continent | Scientific name | Local Names |
Africa | Gilbertiodendron dewevrei | Limbali, otabo, agbabu, ekpagoi-eze |
Africa | Greenwayodendron suaveolens | Africa Teak, atorewa, 岷固亀谩茅, nchua, eleku, agudugbu |
Africa | Anonidium mannii | Junglesop, imido, asumpa, 貌蹋gh岷固乨岷固乬b贸 |
Africa | Petersianthus macrocarpus | Stinkwood tree; soap tree abal茅, tun-tue, p猫h, 茅siv, kpa |
Africa | Santiria trimera | adjouaba 脿 racines a茅riennes, damzin, an-thanjka, kafe, poh, |
Africa | Strombosia pustulata | itako, afina, po茅, mba esogo |
Africa | Tabernaemontana crassa | Adam's-apple flower, k-po艐gbo, opuko, pati茅 pati茅, pete-pete |
Africa | Staudtia kamerunensis | Niov茅, ichala, 峄峛ara-okisi, 铆y矛p 贸k艒y貌聽 |
Africa | Strombosiopsis tetrandra | Bwika, Mbazoo |
Africa | Dichostemma glaucescens | Mangamba, Mongamba |
Amazonia | Oenocarpus bacaba | Bacaba, Turu Palm |
Amazonia | Eschweilera coriacea | 尘补迟补尘补迟谩 |
Amazonia | Iriartea deltoidea | 产辞尘产辞苍补听 |
Amazonia | Pentaclethra macroloba | 辫谤补肠补虫颈听 |
Amazonia | Euterpe oleracea | a莽a铆 palm |
Amazonia | Astrocaryum murumuru | murumuru |
Amazonia | Geissospermum sericeum | quina-quina branca, pao pereira聽 |
Amazonia | Eperua falcata | bootlace tree, bi udu, wapa |
Amazonia | Euterpe precatoria | mountain cabbage; a莽ai, a莽aizeiro, a莽a铆-do-amazonas, palmiche, |
Amazonia | Rinorea racemosa | branquinha |
Southeast Asia | Shorea multiflora | yellow meranti |
Southeast Asia | Tristaniopsis merguensis | Hill Tristania |
Southeast Asia | Cotylelobium melanoxylon | Resak hitam; Khiam khaao; Resak tempurong; Giam tembaga |
Southeast Asia | Dehaasia caesia | Magasil, Medang |
Southeast Asia | Streblus ilicifolius | Jungle Holly, Merlimau |
Southeast Asia | Shorea xanthophylla | seraya kuning barun |
Southeast Asia | Shorea parvifolia | light red meranti, white lauan |
Southeast Asia | Elateriospermum tapos | Perah, Buah Perah, Pogoh Nut, Tapos |
Southeast Asia | Ixonanthes reticulata | Pagar Anak, Ten Men Tree, Inggir Burong, Nyiran Burong |
Southeast Asia | Gluta oba | 搁别苍驳补蝉听 |
Links
- 果冻影院 Faculty of Social & Historical Sciences
- 果冻影院 Centre for Biodiversity and Environment Research
- 果冻影院 Biosciences
Image
- Credit: Maris Maskalans via聽
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E: m.lucibella [at] ucl.ac.uk