Featured Research

from universities, journals, and other organizations

Species Take Care Of Each Other In Ecological Communities

Date:
December 1, 2005
Source:
University of Alberta
Summary:
Unspoken rules of existence in tropical rain forests mean no one species will take up too much space and squeeze others out, says new research conducted in part at the University of Alberta that shows how ecological communities regulate themselves.

Unspoken rules of existence in tropical rain forests mean no one species will take up too much space and squeeze others out, says new research conducted in part at the University of Alberta that shows how ecological communities regulate themselves.

Related Articles


Dr. Fangliang He is part of a research team that studied fundamental questions plaguing scientists since Darwin's time: why are some species so common while others are rare? How do common and rare species interact? And how do hundreds, even thousands, of tree species coexist in a limited space in the tropics?

He, along with Igor Volkov and Jayanth Banavar, from Pennsylvania State University, Stephen Hubbell from the University of Georgia and Amos Maritan from the Universita di Padova in Italy, offer a new theory to explain why tropical rain forests are so species rich and how species are assembled in a community. Their work is published in the current edition of "Nature".

Species must meet certain conditions to live in a community. Understanding the rules that make up community assemblages is one of the most challenging scientific questions facing scientists today. Niche theory, which assumes species differ from one another in various aspects, has been traditionally used to explain community assemblages. However, this theory offers little to predict community assemblage patterns -- the way species share a limited space.

He's work attempts to address community assembly rules based on Hubbell's recently developed neutral theory. "The basic idea of the neutral theory is that community membership is determined by five fundamental processes: birth, death, immigration, speciation and random drift. Furthermore, the theory assumes that every individual in the community, regardless of species identity, has the same rates of birth, death, immigration and mutating into a new species," said He, who is a Canada Research Chair from the Department of Renewable Resources.

The research team modified this theory by arguing that the birth rate and mortality rate are not identical across species, but there is a "density-dependent" probability of birth and death. The more abundant species have lower birth rates and higher mortality rates. "The consequence is that when a species becomes rare, its birth rate will increase and death rate will reduce," said He. In other words, species will regulate themselves to make room for each other if they follow the membership rules. "If not, they're out."

The scientists tested their model using data from six tropical rain forests--these tiny areas can accommodate more than 1000 tree species--across the world. "Our theory offers a better understanding of why tropical rain forests are so species rich," said He. "This rare species advantage regulates dynamics and therefore permits the coexistence of many species in a community."


Story Source:

The above story is based on materials provided by University of Alberta. Note: Materials may be edited for content and length.


Cite This Page:

University of Alberta. "Species Take Care Of Each Other In Ecological Communities." ScienceDaily. ScienceDaily, 1 December 2005. <www.sciencedaily.com/releases/2005/11/051130232921.htm>.
University of Alberta. (2005, December 1). Species Take Care Of Each Other In Ecological Communities. ScienceDaily. Retrieved November 1, 2014 from www.sciencedaily.com/releases/2005/11/051130232921.htm
University of Alberta. "Species Take Care Of Each Other In Ecological Communities." ScienceDaily. www.sciencedaily.com/releases/2005/11/051130232921.htm (accessed November 1, 2014).

Share This



More Plants & Animals News

Saturday, November 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Watch Baby Goose Survive A 400-Foot Cliff Dive

Watch Baby Goose Survive A 400-Foot Cliff Dive

Buzz60 (Oct. 31, 2014) For its nature series Life Story, the BBC profiled the barnacle goose, whose chicks must make a daredevil 400-foot cliff dive from their nests to find food. Jen Markham has the astonishing video. Video provided by Buzz60
Powered by NewsLook.com
World's Salamanders At Risk From Flesh-Eating Fungus

World's Salamanders At Risk From Flesh-Eating Fungus

Newsy (Oct. 31, 2014) The import of salamanders around the globe is thought to be contributing to the spread of a deadly fungus. Video provided by Newsy
Powered by NewsLook.com
Alcoholic Drinks In The E.U. Could Get Calorie Labels

Alcoholic Drinks In The E.U. Could Get Calorie Labels

Newsy (Oct. 31, 2014) A health group in the United Kingdom has called for mandatory calorie labels on alcoholic beverages in the European Union. Video provided by Newsy
Powered by NewsLook.com
Malaria Threat in Liberia as Fight Against Ebola Rages

Malaria Threat in Liberia as Fight Against Ebola Rages

AFP (Oct. 31, 2014) Focus on treating the Ebola epidemic in Liberia means that treatment for malaria, itself a killer, is hard to come by. MSF are now undertaking the mass distribution of antimalarials in Monrovia. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins