150-year records gap on Sulawesi ends with five new species in the world's largest tree genus

June 19, 2017, Pensoft Publishers
Sulawesi lies right in the heart of the Indo-Australian archipelago, also known as the Malesian region. Credit: Fabian Brambach

It seemed rather unusual that the largest tree genus, Syzygium, containing over 1500 species, was only represented by about a dozen of records on the biodiversity-rich island of Sulawesi, the latest new species description dating back to the mid-19th century.

One hundred and fifty years onwards, a new article published in the open access journal PhytoKeys, highlights the large portion of undocumented plant diversity on the island, by introducing not one, but five new species to add to the abundant tree genus.

Conducting fieldwork on plant diversity and ecology of the tropical mountain forests of Sulawesi in the period 2006-12, a team of ecologists from the University of Göttingen had difficulties identifying plant specimens of the myrtle family brought back from their field surveys. They noticed that only some 14 species of Syzygium were known to occur in Sulawesi, surprisingly few compared to around 200 each in neighbouring Borneo and the Philippines.

"In addition to the limited knowledge about in Sulawesi, we were dealing with what is probably the largest genus of trees in the world, the size of which was apparently putting off to many researchers of the past." comments PhD student F. Brambach. "This is probably why our basic knowledge of the taxonomy of Syzygium hasn't improved much since the early days of botanical exploration of the region in the first half of the 19th century."

This is one of the newly described species, Syzygium balgooyi. Credit: Fabian Brambach

The ecologists turned to Dr Byng, director of Plant Gateway and Visiting Research Fellow at Naturalis Biodiversity Centre in the Netherlands, who is coordinating a global revision of Syzygium, a genus best known for the clove tree. To him the possibility of what appeared to be undescribed species came as no surprise.

"After extensive screening of herbarium specimens from Sulawesi, I had estimated around 90 additional species to be present on the island, most of which are not yet named and probably only occur there. This would mean we only currently known around 13% of the island's real diversity," explains the expert.

The potential number of new Syzygium still waiting to be described raises concern, especially when considering the fast rate at which tropical forests in Indonesia are lost. Sulawesi is no exception, with three of the five newly described species considered to be "endangered" following the criteria of the IUCN.

Syzygium galanthum, one of five newly described tree species from Sulawesi. Credit: Fabian Brambach

"In this time of rapid species loss worldwide, cooperation between field ecologists and herbarium taxonomists is important to document the vast diversity of organisms in understudied regions, such as tropical mountain forests, especially for large and complicated groups like Syzygium," Dr Culmsee said.

Well-known for its unique fauna, the flora on the island of Sulawesi has received considerably less attention to date. With the publication of the new five , the authors, Fabian Brambach, Dr Heike Culmsee, and Dr James W. Byng, hope to change this and instigate more botanical research in the area.

Explore further: New genus and five new flea species discovered in Indonesia

Related Stories

New genus and five new flea species discovered in Indonesia

April 13, 2016

A new genus of flea and its five new species have been described in an article in the Journal of Medical Entomology. Four of the species were collected on the island of Sulawesi and the fifth was collected in the Indonesian ...

Carnivorous water rat discovered in Indonesia

June 18, 2014

(Phys.org) —Jacob Esselstyn, curator of mammals at LSU's Museum of Natural Science, was part of a research team that discovered a carnivorous water rat in central Indonesia. The species was previously known only to local ...

Entomologist discovers new wasp species

August 22, 2011

(PhysOrg.com) -- A warrior wasp? A wasp with jaws longer than its front legs? The new species of wasp that Lynn Kimsey, director of the Bohart Museum of Entomology and professor of entomology at the University of California, ...

Recommended for you

How human brains became so big

May 23, 2018

The human brain is disproportionately large. And while abundant grey matter confers certain intellectual advantages, sustaining a big brain is costly—consuming a fifth of energy in the human body.

Rehabilitating lactate: From poison to cure

May 23, 2018

George Brooks has been trying to reshape thinking about lactate—in the lab, the clinic and on the training field—for more than 40 years, and finally, it seems, people are listening. Lactate, it's becoming clear, is not ...

Chimpanzee calls differ according to context

May 23, 2018

An important question in the evolution of language is what caused animal calls to diversify and to encode different information. A team of scientists led by Catherine Crockford of the Max Planck Institute for Evolutionary ...

How a cell knows when to divide

May 23, 2018

How does a cell know when to divide? We know that hundreds of genes contribute to a wave of activity linked to cell division, but to generate that wave new research shows that cells must first grow large enough to produce ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.