Critical Life History Parameters of the Texas Diamond-backed Terrapin, Malaclemys terrapin littoralis

Purpose/Objectives

The objectives of this study are to 1) develop estimates of local population abundance and density of Texas diamond-backed terrapin; 2) estimate various demographic and population parameters including relative age, size, sex distributions and somatic growth, total and natural mortality and birth rates; 3) evaluate habitat preferences including physical and biological foraging and nesting attributes; and 4) estimate crab trap bycatch mortality rates for Texas diamond-backed terrapin.

Study Area

Coastal Texas (with focus on Galveston Bay)

Project Period

2007 – Present

Description

The diamond-backed terrapin is the only turtle species to live exclusively in brackish water. Due to their limited distribution and unique life history, little information has been gathered on the numbers or health of terrapin state-wide. This research will build upon previous research conducted by EIH on the population of the Texas diamond-backed terrapin.

Publications and Presentations

Alleman, B.J. and Guillen, G. 2017. Prey availability and diet analysis of Texas diamond-backed terrapin (Malaclemys terrapin littoralis). Chelonian Conservation and Biology 16.1:52–61.

Alleman, B.J. and Guillen, G.J. 2016. Malaclemys terrapin littoralis (Texas diamond-backed terrapin). Herpetological Review 47:286.

Alleman, B.J. 2015. Diet Analysis and Assessment of Habitat and Prey Availability Associated with Texas Diamond-backed Terrapin (Malaclemys terrapin littoralis). University of Houston-Clear Lake, Houston.

Alleman, B., Guillen, G. 2015. Assessment of Habitat and Prey Availability Associated with the Distribution of Texas Diamond-backed Terrapin (Malaclemys terrapin littoralis). Texas Bays and Estuaries Meeting, Port Aransas, TX. Presentation.

Alleman, B., Guillen, G. 2015. Diet of Texas Diamondback Terrapin (Malaclemys terrapin littoralis). Texas Academy of Science Meeting, San Antonio, TX. Presentation.

Clarkson, E. and Guillen, G. 2015. Malaclemys terrapin littoralis (Texas diamond-backed terrapin). Herpetological Review 46.1:83.

Guillen, G., Gordon, M.L., Oakley, J., Mokrech, M., Alleman, B., George, R., and Bush, D. 2015. Population survey of the Texas diamondback terrapin, Malaclemys terrapin littoralis, in San Antonio Bay, Matagorda Bay, and Sabine Lake. EIH Report 15-001, 194 pp.

Alleman, B., Guillen, G. 2014. Characterization of Prey Availability Between Texas Diamondback Terrapin (Malaclemys terrapin littoralis) Capture Sites and Background Wetland Densities. Texas Academy of Science Meeting, Galveston, TX. Poster.

George, R.R. 2014. Nesting Ecology of the Texas Diamondback Terrapin (Malaclemys terrapin littoralis). University of Houston-Clear Lake, Houston.

Moss, M. Guillen, G. 2014. Mid-upper Coast Surveys of Texas Diamondback Terrapin. 1st Meeting of the Texas Diamondback Terrapin Working Group, Port Aransas, TX. Presentation.

Moss, M., Guillen, G., Alleman, B., George, R. 2014. Population Survey of the Texas Diamondback Terrapin in San Antonio Bay, Matagorda Bay, and Sabine Lake: Preliminary Results. Mission-Aransas National Wildlife Refuge Research Symp., Port Aransas,TX. Presentation.

Glenos, S.M. 2013. A Comparative Assessment of Genetic Variation of Diamondback Terrapin (Malaclemys terrapin) in Galveston Bay, Texas in Relation to Other Northern Gulf Coast Populations. University of Houston-Clear Lake, Houston. Thesis.

Guillen, G., Oakley, J.W. 2013. Bycatch Mortality and Critical Life History Parameters of the Texas Diamondback Terrapin. EIH Technical Report 13-004:151.

Clarkson, E. 2012. Short Term Temporal Trends in Activity and Habitat Selection of the Texas Diamondback Terrapin. University of Houston-Clear Lake, Houston. Thesis.

Clarkson, E., Guillen, G. 2011. Small-scale Habitat Selection and Activity Trends of the Diamondback Terrapin in West Galveston Bay, Texas as Determined by Acoustic Telemetry. In American Society of Ichthyologists and Herpetologists, Minneapolis, MN. Poster.

Guillen, G., Clarkson, E., Oakley, J.W. 2011. Mid-Texas Coast Complex Texas Diamondback Terrapin (Malaclemys terrapin littoralis) Ecology Project. EIH Technical Report 12-004:33.

Haskett, K. 2011. Abundance and Movement of the Texas Diamondback Terrapin in the Deer Island Complex, Galveston, Texas. University of Houston-Clear Lake, Houston. Thesis.

Marlow, A., Guillen, G. 2011. Injury Rates of Diamondback Terrapin (Malaclemys terrapin) in Galveston Bay, Texas. In Diamondback Terrapin Working Group. Poster.

Wrast, J., Guillen, G., Mokrech, M., McCarthy, E. 2011. Development of a Habitat Suitability Index for the Texas Diamondback Terrapin, Malaclemys terrapin littoralis. In Restore America's Estuaries, Galveston, TX. Poster.

Clarkson, E., Marlow, A., Guillen, G. 2010. Site Fidelity and Range of an Island Population of Diamondback Terrapin (Malaclemys terrapin) in West Galveston Bay, Texas. In Diamondback Terrapin Working Group. Poster.

Haskett, K., Guillen, G. 2010. Population Characteristics of Diamondback Terrapin at the Deer Island Complex; Galveston Texas During 2008. EIH Technical Report 10-017:37.

Project Sponsors

Related links

Video: Texas Diamondback Terrapin - Environmental Institute of Houston

Video: Saving North Deer Island Bird Rookery - Texas Parks and Wildlife [Official]

Contact
  • Environmental Institute of Houston

    Phone: 281-283-3950
    Email: eih@uhcl.edu

    North Office Annex
    2700 Bay Area Blvd, Box 540
    Houston, TX 77058-1002

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  • Have you seen a terrapin?


    We are always looking to find new terrapin populations along the Texas coast. If you think that you have spotted a terrapin, let us know! Report terrapin sightings to eih@uhcl.edu.


    Volunteer Opportunities


    Field research volunteers are needed! Please contact Dr. George Guillen at 283-283-3950 for more information.