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: Community of soil bacteria saves wild tobacco plants from root rot

Related Stories

It's a titi! New monkey species found in Peru

August 22, 2015

For nearly a century the carcass of a small, reddish-brown monkey from South America gathered dust in a windowless backroom of the American Natural History Museum in New York City.

Colonisation benefits illustrated via tortoise program

August 10, 2015

Moving species outside of their native habitat to protect them from threats like climate change is becoming a more accepted approach and sometimes is a last resort for certain species, according to a review of the technique.

Recommended for you

New Horizons team selects potential Kuiper Belt flyby target

August 29, 2015

NASA has selected the potential next destination for the New Horizons mission to visit after its historic July 14 flyby of the Pluto system. The destination is a small Kuiper Belt object (KBO) known as 2014 MU69 that orbits ...

Interactive tool lifts veil on the cost of nuclear energy

August 24, 2015

Despite the ever-changing landscape of energy economics, subject to the influence of new technologies and geopolitics, a new tool promises to root discussions about the cost of nuclear energy in hard evidence rather than ...

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.