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Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
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Assessment of Sea-Turtle Status and Trends

Integrating Demography and Abundance

Committee on the Review of Sea-Turtle Population Assessment Methods

Ocean Studies Board

Division on Earth and Life Studies

NATIONAL RESEARCH COUNCIL
OF THE NATIONAL ACADEMIES

THE NATIONAL ACADEMIES PRESS

Washington, D.C.
www.nap.edu

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

THE NATIONAL ACADEMIES PRESS
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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by Contract No. DG133R08CQ0062 between the National Academy of Sciences and the National Oceanic and Atmospheric Administration. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the project.

International Standard Book Number-13: 978-0-309-15255-6

International Standard Book Number-10: 0-309-15255-0

Cover: The front cover images include five of the six species of sea turtles found in U.S. waters (from top to bottom and left to right): leatherback (provided by Guillaume Feuillet, Association Kwata), Kemp’s ridley (provided by Selina Heppell, Oregon State University), hawksbill (provided by the National Oceanic and Atmospheric Administration), olive ridley (provided by Guillaume Feuillet, Association Kwata), and green (provided by Claire Fackler, National Oceanic and Atmospheric Administration). The back cover image is the sixth species, which is the loggerhead (provided by William Precht, National Oceanic and Atmospheric Administration).

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Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

THE NATIONAL ACADEMIES

Advisers to the Nation on Science, Engineering, and Medicine


The National Academy of Sciences is a private, nonprofit, self-perpetuating society of distinguished scholars engaged in scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the general welfare. Upon the authority of the charter granted to it by the Congress in 1863, the Academy has a mandate that requires it to advise the federal government on scientific and technical matters. Dr. Ralph J. Cicerone is president of the National Academy of Sciences.


The National Academy of Engineering was established in 1964, under the charter of the National Academy of Sciences, as a parallel organization of outstanding engineers. It is autonomous in its administration and in the selection of its members, sharing with the National Academy of Sciences the responsibility for advising the federal government. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achievements of engineers. Dr. Charles M. Vest is president of the National Academy of Engineering.


The Institute of Medicine was established in 1970 by the National Academy of Sciences to secure the services of eminent members of appropriate professions in the examination of policy matters pertaining to the health of the public. The Institute acts under the responsibility given to the National Academy of Sciences by its congressional charter to be an adviser to the federal government and, upon its own initiative, to identify issues of medical care, research, and education. Dr. Harvey V. Fineberg is president of the Institute of Medicine.


The National Research Council was organized by the National Academy of Sciences in 1916 to associate the broad community of science and technology with the Academy’s purposes of furthering knowledge and advising the federal government. Functioning in accordance with general policies determined by the Academy, the Council has become the principal operating agency of both the National Academy of Sciences and the National Academy of Engineering in providing services to the government, the public, and the scientific and engineering communities. The Council is administered jointly by both Academies and the Institute of Medicine. Dr. Ralph J. Cicerone and Dr. Charles M. Vest are chair and vice chair, respectively, of the National Research Council.


www.national-academies.org

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

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Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

COMMITTEE ON THE REVIEW OF SEA-TURTLE POPULATION ASSESSMENT METHODS

KAREN A. BJORNDAL (Chair),

University of Florida, Gainesville

BRIAN W. BOWEN,

University of Hawaii

MILANI CHALOUPKA,

Ecological Modelling Services Pty Ltd, St. Lucia, Australia

LARRY B. CROWDER,

Duke University, Beaufort, North Carolina

SELINA S. HEPPELL,

Oregon State University, Corvallis

CYNTHIA M. JONES,

Old Dominion University, Norfolk, Virginia

MOLLY E. LUTCAVAGE,

University of Massachusetts, Amherst

ANDREW R. SOLOW,

Woods Hole Oceanographic Institution, Massachusetts

BLAIR E. WITHERINGTON,

Florida Fish and Wildlife Conservation Commission, Melbourne Beach

Staff

JODI BOSTROM, Associate Program Officer

SUSAN PARK, Senior Program Officer (until December 31, 2009)

DAVID POLICANSKY, Scholar

JEREMY JUSTICE, Senior Program Assistant

NORMAN GROSSBLATT, Senior Editor

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

OCEAN STUDIES BOARD

DONALD F. BOESCH (Chair),

University of Maryland Center for Environmental Science, Cambridge

EDWARD A. BOYLE,

Massachusetts Institute of Technology, Cambridge

JORGE E. CORREDOR,

University of Puerto Rico, Mayagüez

KEITH R. CRIDDLE,

University of Alaska Fairbanks, Juneau

JODY W. DEMING,

University of Washington, Seattle

MARY (MISSY) H. FEELEY,

ExxonMobil Exploration Company, Houston, Texas

ROBERT HALLBERG,

National Oceanic and Atmospheric Administration and Princeton University, New Jersey

DEBRA HERNANDEZ,

Hernandez and Company, Isle of Palms, South Carolina

ROBERT A. HOLMAN,

Oregon State University, Corvallis

KIHO KIM,

American University, Washington, DC

BARBARA A. KNUTH,

Cornell University, Ithaca, New York

ROBERT A. LAWSON,

Science Applications International Corporation, San Diego, California

GEORGE I. MATSUMOTO,

Monterey Bay Aquarium Research Institute, Moss Landing, California

JAY S. PEARLMAN,

The Boeing Company (retired), Port Angeles, Washington

ANDREW A. ROSENBERG,

Conservation International, Arlington, Virginia

DANIEL L. RUDNICK,

Scripps Institution of Oceanography, La Jolla, California

ROBERT J. SERAFIN,

National Center for Atmospheric Research, Boulder, Colorado

ANNE M. TREHU,

Oregon State University, Corvallis

PETER L. TYACK,

Woods Hole Oceanographic Institution, Massachusetts

DAWN J. WRIGHT,

Oregon State University, Corvallis

JAMES A. YODER,

Woods Hole Oceanographic Institution, Massachusetts

Staff

SUSAN ROBERTS, Director

CLAUDIA MENGELT, Senior Program Officer

DEBORAH GLICKSON, Program Officer

MARTHA MCCONNELL, Program Officer

JODI BOSTROM, Associate Program Officer

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

SHUBHA BANSKOTA, Financial Associate

PAMELA LEWIS, Administrative Coordinator

SHERRIE FORREST, Research Associate

HEATHER CHIARELLO, Senior Program Assistant

JEREMY JUSTICE, Senior Program Assistant

Page viii Cite
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Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

Acknowledgments

This report was greatly enhanced by the participants of the meetings held as part of the committee’s study. The committee acknowledges the efforts of those who gave presentations at meetings: Steve Murawski (National Oceanic and Atmospheric Administration), Barbara Schroeder (National Oceanic and Atmospheric Administration), Sandy MacPherson (U.S. Fish and Wildlife Service), Earl Possardt (U.S. Fish and Wildlife Service), Yan Jiao (Virginia Polytechnic Institute and State University), Mark Maunder (Inter-American Tropical Tuna Commission), Paul Wade (National Oceanic and Atmospheric Administration), and Bryan Wallace (Conservation International). Their talks helped to set the stage for fruitful discussions in the closed sessions that followed.

This report has been reviewed in draft form by individuals chosen for their diverse perspectives and technical expertise, in accordance with procedures approved by the National Research Council’s Report Review Committee. The purpose of this independent review is to provide candid and critical comments that will assist the institution in making its published report as sound as possible and to ensure that the report meets institutional standards for objectivity, evidence, and responsiveness to the study charge. The review comments and draft manuscript remain confidential to protect the integrity of the deliberative process. We wish to thank the following individuals for their review of this report:

RICHARD T. DURRETT, Cornell University, Ithaca, New York

MASAMI FUJIWARA, Texas A&M University, College Station

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

MATTHEW GODFREY, Sea Turtle Project, Beaufort, North Carolina

BRENDAN GODLEY, University of Exeter, Tremough Campus, United Kingdom

MARTÍN HALL, Inter-American Tropical Tuna Commission, La Jolla, California

WILLIAM L. KENDALL, U.S. Geological Survey, Laurel, Maryland

JACK MUSICK, College of William and Mary, Gloucester, Virginia

EUGENIA NARO-MACIEL, American Museum of Natural History, New York

MICHAEL ORBACH, Duke University, Beaufort, North Carolina

JOSEPH M. QUATTRO, University of South Carolina, Columbia

H. BRADLEY SHAFFER, University of California, Davis

MELISSA SNOVER, National Park Service, Denali Park, Alaska

PATRICK SULLIVAN, Cornell University, Ithaca, New York

JEANETTE WYNEKEN, Florida Atlantic University, Boca Raton

Although the reviewers listed above have provided many constructive comments and suggestions, they were not asked to endorse the conclusions or recommendations nor did they see the final draft of the report before its release. The review of this report was overseen by John J. Magnuson (University of Wisconsin) and Robert T. Paine (University of Washington). Appointed by the National Research Council, they were responsible for making certain that an independent examination of this report was carried out in accordance with institutional procedures and that all review comments were carefully considered. Responsibility for the final content of this report rests entirely with the authoring committee and the institution.

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×
Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
×

4

 

Abundance and Trends

 

55

   

 Review of Techniques for Measuring Population Trends at Nesting Beaches,

 

55

   

 Review of Techniques for Measuring Population Trends in Oceanic and Neritic Habitats,

 

59

   

 Conclusions and Recommendations,

 

68

5

 

Demographic Rates

 

73

   

 Breeding Rates and Adult-Recruitment Probabilities,

 

74

   

 Fecundity,

 

75

   

 Survival Probabilities,

 

79

   

 Dispersal Probabilities,

 

81

   

 Somatic Growth and Age at Sexual Maturity,

 

83

   

 Sex Ratios,

 

84

   

 Density Dependence,

 

84

   

 Strandings Data,

 

86

   

 Recommendations,

 

89

6

 

Integrating Demographic Information with Abundance Estimates

 

91

   

 Models for Population Assessment,

 

92

   

 Tools for Assessment,

 

92

   

 Trend Evaluation and Extinction Risk,

 

93

   

 Assessment Procedures for Scientific Review of Data and Models,

 

100

   

 Conclusions,

 

106

   

 Recommendations,

 

107

7

 

Cross-Cutting Issues: Data, Education, Permits, and Coordination

 

109

   

 Data Management,

 

109

   

 Education and Capacity Building,

 

114

   

 Allocation of Management and Research Funds,

 

116

   

 Permitting,

 

116

   

 Recommendations,

 

118

8

 

Conclusions and Recommendations

 

121

 

 

References

 

125

 

 

Appendixes

 

 

   

 A  Brief History of Alternative Genetic Markers

 

155

   

 B  Population-Structure Models

 

157

   

 C  Committee and Staff Biographies

 

159

Suggested Citation:"Front Matter." National Research Council. 2010. Assessment of Sea-Turtle Status and Trends: Integrating Demography and Abundance. Washington, DC: The National Academies Press. doi: 10.17226/12889.
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All six species of sea turtles found in U.S. waters are listed as endangered or threatened, but the exact population sizes of these species are unknown due to a lack of key information regarding birth and survival rates. The U.S. Endangered Species Act prohibits the hunting of sea turtles and reduces incidental losses from activities such as shrimp trawling and development on beaches used for nesting. However, current monitoring does not provide enough information on sea turtle populations to evaluate the effectiveness of these protective measures.

Sea Turtle Status and Trends reviews current methods for assessing sea turtle populations and finds that although counts of sea turtles are essential, more detailed information on sea turtle biology, such as survival rates and breeding patterns, is needed to predict and understand changes in populations in order to develop successful management and conservation plans.

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