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Species distribution models can exaggerate differences in environmental requirements

Date:
April 27, 2010
Source:
National Institute for Mathematical and Biological Synthesis (NIMBioS)
Summary:
Separate species that live in radically different environments don't necessarily also have different ecological niches. This is the finding of a study investigating the accuracy of current statistical tests that use models of geographic distributions to infer changes in environmental requirements.

Individuals of the same species sometimes occupy radically different environments. For example, some populations of the Mojave Yucca (Yucca shidigera) live sites along the coast of the Pacific Ocean, a region with a relatively moderate climate, such as the one in this photo, while others live in quite dry portions of the Colorado Desert in Joshua Tree National Park in California. A new study published in the journal Systematic Biology indicates that in some circumstances this observation can mislead ecologists into concluding that distinct populations have different environmental requirements.
Credit: William Godsoe/NIMBioS

Separate species that live in radically different environments don't necessarily also have different ecological niches. This is the finding of a study investigating the accuracy of current statistical tests that use models of geographic distributions to infer changes in environmental requirements.

In a new study published in the journal Systematic Biology, a model simulating the distributions of two imaginary species with identical environmental requirements, or ecological niches, was created. The model was tested to determine whether a variety of ecological niche modeling methods would correctly infer that the environmental requirements of the two species were identical. In cases where environments were similar or only moderately different, many tests correctly inferred that the environmental requirements of two species were identical, but in the case of radically different environments, the results were biased toward suggesting different environmental requirements.

"If you have two separate populations that occupy different environments, what the study shows is that under some conditions, that observation is really useful and strongly suggests, for example, that you could re-introduce one population into the range of another," said the study's author William Godsoe, a postdoctoral fellow at the National Institute for Mathematical and Biological Synthesis (NIMBioS), an NSF-supported math and biology institute at the University of Tennessee, Knoxville.

"But the fact that the two populations live in different environments could be a trivial observation and lead to erroneous conclusions. For example, you might infer that the two populations have different environmental requirements, suggesting that reintroducing one species into the other wouldn't work, when in fact it could," Godsoe said.

The findings have important implications for understanding the relationship between the environmental requirements of a species -- its niche -- and its geographic distribution.

"There is a growing interest in using data on the geographic distributions of a species. This study clarifies the conditions under which distribution data can mislead us, and in the future, this might help us make better management decisions about a species," Godsoe explained.

The National Institute for Mathematical and Biological Synthesis (NIMBioS) brings together researchers from around the world to collaborate across disciplinary boundaries to investigate solutions to basic and applied problems in the life sciences. NIMBioS is sponsored by the National Science Foundation, the U.S. Department of Homeland Security, and the U.S. Department of Agriculture with additional support from The University of Tennessee, Knoxville.


Story Source:

The above story is based on materials provided by National Institute for Mathematical and Biological Synthesis (NIMBioS). Note: Materials may be edited for content and length.


Journal Reference:

  1. Godsoe et al. Regional Variation Exaggerates Ecological Divergence in Niche Models. Systematic Biology, 2010; 59 (3): 298 DOI: 10.1093/sysbio/syq005

Cite This Page:

National Institute for Mathematical and Biological Synthesis (NIMBioS). "Species distribution models can exaggerate differences in environmental requirements." ScienceDaily. ScienceDaily, 27 April 2010. <www.sciencedaily.com/releases/2010/04/100414161553.htm>.
National Institute for Mathematical and Biological Synthesis (NIMBioS). (2010, April 27). Species distribution models can exaggerate differences in environmental requirements. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2010/04/100414161553.htm
National Institute for Mathematical and Biological Synthesis (NIMBioS). "Species distribution models can exaggerate differences in environmental requirements." ScienceDaily. www.sciencedaily.com/releases/2010/04/100414161553.htm (accessed October 21, 2014).

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