HOME >> BIOLOGY >> NEWS
Report challenges common ecological hypothesis about species abundance

DURHAM, N.C. -- A new report finds little empirical evidence to support a widely held ecological assumption that species are most abundant near the centers of their geographic ranges and decline in abundance near the ranges' edges.

"When we reviewed data from published studies that looked at species abundance at multiple sites across a range, we found almost no evidence that supported the so-called 'abundant-center hypothesis' and strong evidence that contradicted it," said Raphael D. Sagarin, associate director for oceans and coastal policy at Duke University's Nicholas Institute for Environmental Policy Solutions.

"This is troubling," Sagarin said, "because a lot of current thinking on ecological and evolutionary issues -- including how species will respond to climate change, how to identify probable locations of pest outbreaks, how genetic diversity is distributed among populations and where to locate habitat preserves -- has been based on the hypothesis."

The validity of these ideas now needs to be re-examined using empirical studies, he said.

Sagarin is one of the principal authors of the report, which appeared in the September 2006 issue of the journal Trends in Ecology and Evolution. Other authors are Steven D. Gaines of the University of California-Santa Barbara's Marine Science Institute and Department of Ecology, Evolution and Marine Biology; and Brian Gaylord of the University of California-Davis's Bodega Marine Laboratory and Section of Evolution and Ecology.

For their analysis, the authors reviewed not only published studies but also some new sets of data that they had compiled from field observations in a number of coastal locations of such invertebrate species as sea urchins, sea anemones and snails. They found that most of the studies showed that patterns of abundance were affected by a complex interplay of environmental, physical, biological, genetic and geographical factors that the abundant-center hy
'"/>

Contact: Tim Lucas
tdlucas@duke.edu
919-613-8084
Duke University
3-Oct-2006


Page: 1 2

Related biology news :

1. Report recommends off-site disposal of secondary waste
2. SNM initiatives supported by inclusions in NAS Report on competitiveness of US chemistry research
3. AAAS/EurekAlert! refocus on China with 2007 Fellowships for Science Reporters in Developing Regions
4. Report calls for improved monoclonal antibodies against solid tumors
5. Report outlines funding to conserve half of Massachusettss land
6. Report highlights change in Canadas forests
7. Report: Canadas Yellowstone too small for wildlife
8. Report warns about carbon dioxide threats to marine life
9. Report focuses on the role good microbes play in future medicine
10. Herringtons annual 2006 State of the Shore Report, May 22
11. Report finds cruise industry is protecting the precious places it visits

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/14/2019)... (PRWEB) , ... August 13, 2019 , ... ... Medicine Team, Division of Molecular Pathology, Institute of Cancer Research (ICR) in a ... BST/UK) to learn about the process of biomarker and companion diagnostic development including ...
(Date:8/6/2019)... (PRWEB) , ... August 06, 2019 , ... ... identifies a computational modeling system that could have far-reaching implications for personalized medicine, ... least squares regression (PLSR), is able to predict which stem cell donors and ...
(Date:8/6/2019)... PORTLAND, Ore. (PRWEB) , ... August 05, 2019 ... ... X-ray analytical technology, is pleased to announce its attendance at the Microscopy & ... 2019 in Portland, Oregon at the Oregon Convention Center. , The Microscopy & ...
Breaking Biology News(10 mins):
(Date:7/11/2019)... ... July 11, 2019 , ... At the most recent stem ... to eight military Veterans under the R3 Heroes Program. The Veterans included individuals and ... Heroes Program allow anyone to nominate a military Veteran, teacher or first responder to ...
(Date:6/18/2019)... YORK and SOMERSET, N.J. (PRWEB) , ... June ... ... Catalent Biologics, today announced that they have entered into an agreement for production ... product candidates, IC-100 for the treatment of rhodopsin-mediated autosomal dominant retinitis pigmentosa (RHO-adRP) ...
(Date:6/11/2019)... ... June 10, 2019 , ... ... 80 of its scientific journals to DeepDyve’s rental service for peer-reviewed journals. ... expanding library of more than 20 million articles, sourced from more than 15,000 ...
(Date:5/31/2019)... ... ... For many years, the primary forms of cancer treatment have been chemotherapy, radiation ... have led to the advent of Chimeric Antigen Receptor T (CAR T) cell therapy, ... “CARs”. The CAR enables the final product to produce chemicals in the hopes that ...
Breaking Biology Technology:
Cached News: