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Human activity may have boosted shellfish size, archaeological study shows

Date:
August 31, 2010
Source:
North Carolina State University
Summary:
In a counter-intuitive finding, new research shows that a species of shellfish widely consumed in the Pacific over the past 3,000 years has actually increased in size, despite -- and possibly because of -- increased human activity in the area.

Researchers found that the average size of the humped conch increased in conjunction with a growing human population.
Credit: Image courtesy of North Carolina State University

In a counter-intuitive finding, new research from North Carolina State University shows that a species of shellfish widely consumed in the Pacific over the past 3,000 years has actually increased in size, despite -- and possibly because of -- increased human activity in the area.

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"What we've found indicates that human activity does not necessarily mean that there is going to be a negative impact on a species -- even a species that people relied on as a major food source," says Dr. Scott Fitzpatrick, associate professor of sociology and anthropology at NC State and co-author of the study. "The trends we see in the archaeological record in regard to animal remains are not always what one would expect."

At issue is the humped conch, Strombus gibberulus, a small mollusk that has been a food source in the Pacific islands for thousands of years. The researchers dated and measured more than 1,400 humped conch shells found at an archaeological site on the island of Palau in the western Pacific. They expected the size of the conchs to decrease over time, based on the conventional wisdom that an expanding human population would result in the conchs being harvested before they could achieve their maximum size.

Instead, the researchers were surprised to find that the average size of the conchs actually increased in conjunction with a growing human population. Specifically, the length of the average conch increased by approximately 1.5 millimeters (mm) over the past 3,000 years. That may not sound like much, but it is significant when you consider the conchs are only around 30 mm long -- which means the conchs are now almost 5 percent larger than they used to be.

Fitzpatrick believes the size increase is likely related to an increase in nutrients in the conch's waters, stemming from increased agriculture and other human activities.

"In the big picture," Fitzpatrick says, "this study tells us to focus on the physical evidence and beware of conventional wisdom. It also tells us that using a large number of samples is important. Previous studies had shown a decline in conch size at Pacific archaeological sites -- but they used smaller sample sizes. Maybe that is a factor in their findings."

The study was co-authored by Fitzpatrick, Christina Giovas of the University of Washington, and two NC State undergraduates, Meagan Clark and Mira Abed. A paper describing the study, "Evidence for size increase in an exploited mollusk: humped conch (Strombus gibberulus) at Chelechol ra Orrak, Palau from ca. 3000-0 BP," will be published in a forthcoming issue of the Journal of Archaeological Science. The samples used in the study were collected as part of a National Science Foundation-funded research initiative.

NC State's Department of Sociology and Anthropology is a joint department under the university's College of Humanities and Social Sciences and College of Agriculture and Life Sciences.


Story Source:

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


Journal Reference:

  1. Giovas et al. Evidence for size increase in an exploited mollusc: humped conch (Strombus gibberulus) at Chelechol ra Orrak, Palau from ca. 3000–0 BP. Journal of Archaeological Science, 2010; 37 (11): 2788 DOI: 10.1016/j.jas.2010.06.013

Cite This Page:

North Carolina State University. "Human activity may have boosted shellfish size, archaeological study shows." ScienceDaily. ScienceDaily, 31 August 2010. <www.sciencedaily.com/releases/2010/08/100831102631.htm>.
North Carolina State University. (2010, August 31). Human activity may have boosted shellfish size, archaeological study shows. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2010/08/100831102631.htm
North Carolina State University. "Human activity may have boosted shellfish size, archaeological study shows." ScienceDaily. www.sciencedaily.com/releases/2010/08/100831102631.htm (accessed October 24, 2014).

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