When lava flows and glaciers recede, predicting how species take over

May 23, 2007
Receding Glacier in Alaska
Primary succession following a receding glacier in Alaska. Credit: K.J. Anderson

When fire, clearcutting, lava or receding glaciers create empty habitat, species arrive to form a new ecological community. Adverse conditions -- such as isolation of the new community or an unfavorable climate -- may hinder the arrival of new species and change the pattern of succession. This study provides a framework to understand why communities mature at different rates, which is fundamental to managing clear cuts or fire.

Whenever an event such as a fire, clear cut, or lava flow creates an empty habitat, species arrive, interact, and assemble to form a new ecological community—a process known as "succession." How quickly does succession proceed?

Most ecologists might expect change to be rapid at first and then decline as the community ages, but there was no systematic analysis of this idea until recently. In a study published in the June issue of the American Naturalist, ecologist Kristina Anderson of the University of New Mexico showed that in many communities—ranging from plants in abandoned agricultural fields to arthropods on carcasses—species do indeed turn over most rapidly early in succession, when many new species arrive to take advantage of available resources.

However, she also found that certain adverse conditions—such as isolation of the new community or an unfavorable climate—may hinder the arrival of new species, thereby slowing the rate at which the community fills with species and sometimes causing peak rates of change to occur later in succession.

Anderson's study provides a framework to understand why communities mature at different rates. According to the author, "Understanding how quickly new ecological communities develop is fundamental to numerous ecological questions ranging from, 'How often should fires or clear cuts be allowed on landscapes?' to 'What determines how many species are found on an island?' yet we were unable to make many generalizations about succession rate. That is what motivated this study."

In her study, Anderson first developed a method for quantifying rates of community change and how these vary as the community ages. She then collected data on over 60 different communities—a novel approach in succession research—and documented the changes in species composition throughout succession. Using these results, she was able to relate temporal patterns in rates of community change to processes that limit colonization and persistence of species: competition, harsh environmental conditions, and difficulty getting to the site.

The author states, "We still have many unanswered questions regarding rates of succession. My hope is that this study will inspire and inform future research on succession rate."

Source: University of Chicago

Explore further: New species discovered in Malaysian rainforest during unprecedented, top-to-bottom survey

Related Stories

Video: Surviving the onslaught of invasive species

December 6, 2017

No place on the planet is truly isolated anymore, which means invasive species travel as easy as humans, hitchhiking on boats and planes with potentially devastating effects on the ecosystems they land in.

Recommended for you

'Smoke rings' in the ocean spotted from space

December 11, 2017

Researchers from the University of Liverpool have spotted the equivalent of smoke-rings in the ocean which they think could 'suck-up' small marine creatures and carry them at high speed and for long distances across the ocean.

Volumetric 3-D printing builds on need for speed

December 11, 2017

While additive manufacturing (AM), commonly known as 3-D printing, is enabling engineers and scientists to build parts in configurations and designs never before possible, the impact of the technology has been limited by ...

The initial mass function

December 11, 2017

The gas and dust in giant molecular clouds gradually come together under the influence of gravity to form stars. Precisely how this occurs, however, is incompletely understood. The mass of a star, for example, is by far the ...

0 comments

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.