Using spatial and behavioral data to evaluate the seasonal bycatch risk of diamondback terrapins Malaclemys terrapin in crab pots

Harden, Leigh Anne; Williard, Amanda Southwood

doi:10.3354/meps09958

Cited by 28 publications

(39 citation statements)

References 23 publications

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“…2), with the understanding that there may have been a gradual transition in activity level that spanned the two intervals. These observed habitat and activity shifts are supported by previous radio telemetry and temperature data logger research that documented infrequent movements in the winter and timing of spring emergence for free-ranging terrapins (Harden and Williard, 2012;Akins et al, 2014), and are further supported by seasonal shifts in terrapin blood biochemistry (Harden, 2013).…”

Section: Resultssupporting

confidence: 71%

“…Terrapins in this study exhibited seasonal differences in activity patterns and habitat use (Harden and Williard, 2012;Akins et al, 2014) that are similar to patterns observed for other semi-aquatic turtle species at temperate latitudes (Grayson and Dorcas, 2004;Litzgus et al, 2004;Tuma, 2006;Harden et al, 2009;Pittman and Dorcas, 2009;Rowe and Dalgarn, 2009). The shift from quiescent burial to surface activity underlies the significant increase in terrapin body water flux observed post-dormancy.…”

Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

“…Seasonal shifts between aquatic and terrestrial habitats may also play a role in osmoregulation (Spivey, 1998;Butler, 2002;Haramis et al, 2011;Southwood Williard and Harden, 2011;Harden and Williard, 2012;Akins et al, 2014). Terrapins are most active during the warm months of late spring, summer and early autumn, when they may be found swimming and foraging in flooded marshes at high tide (Tucker et al, 1995;Whitelaw and Zajac, 2002;Harden and Williard, 2012). As temperatures decrease in the autumn, terrapins enter a period of winter dormancy in which they cease eating, drastically reduce activity levels and spend the large majority of their time buried shallowly in the mud of the subtidal or intertidal zone (Harden and Williard, 2012;Akins et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Terrapins are most active during the warm months of late spring, summer and early autumn, when they may be found swimming and foraging in flooded marshes at high tide (Tucker et al, 1995;Whitelaw and Zajac, 2002;Harden and Williard, 2012). As temperatures decrease in the autumn, terrapins enter a period of winter dormancy in which they cease eating, drastically reduce activity levels and spend the large majority of their time buried shallowly in the mud of the subtidal or intertidal zone (Harden and Williard, 2012;Akins et al, 2014). Davenport and Magill (Davenport and Magill, 1996) proposed that under certain conditions mud burial could reduce rates of water loss in terrapins.…”

Section: Introductionmentioning

confidence: 99%

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Total body water and water turnover rates in the estuarine diamondback terrapin (Malaclemys terrapin) during the transition from dormancy to activity

Harden

Duernberger

Jones

et al. 2014

Journal of Experimental Biology

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Water and salt concentrations in an animal's body fluids can fluctuate with changing environmental conditions, posing osmoregulatory challenges that require behavioral and physiological adjustments. The purpose of this study was to investigate body water dynamics in the estuarine diamondback terrapin (Malaclemys terrapin), a species that undergoes seasonal dormancy in salt marsh habitats. We conducted a field study to determine the total body water (%TBW), water turnover rate (WTR) and daily water flux (DWF) of female terrapins in south eastern North Carolina pre-and post-emergence from winter dormancy. Terrapins were injected with [ 2 H]deuterium on two occasions and washout of the isotope was monitored by taking successive blood samples during the period of transition from dormancy to activity. The WTR and DWF of dormant terrapins were significantly lower than those of active terrapins (WTR dormant =49.70±15.94 ml day ). There was no significant difference in %TBW between dormant and active terrapins (75.05±6.19% and 74.54±4.36%, respectively). The results from this field study provide insight into the terrapin's ability to maintain osmotic homeostasis while experiencing shifts in behavioral and environmental conditions.

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Section: Resultssupporting

confidence: 71%

Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Total body water and water turnover rates in the estuarine diamondback terrapin (Malaclemys terrapin) during the transition from dormancy to activity

Harden

Duernberger

Jones

et al. 2014

Journal of Experimental Biology

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Sampling rare and elusive species: Florida east coast diamondback terrapin population abundance

et al. 2019

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The Florida east coast terrapin (Malaclemys terrapin tequesta) is a rare and potentially endangered species that is difficult to survey because of poor detection probability and a patchy distribution. Like many rare species sampling programs, we apply a density and multistate occupancy sampling approach that considered the impacts of imperfect detection. We separated the detection process into availability of the animal within the sampling area (e.g., coming to surface) and perceptibility (actually seeing it). Our study employed a density estimation approach originally developed for birds, which combined time to detection and distance sampling within a Bayesian N-mixture model. Our study also estimated two abundance occupancy states (few and many terrapins). We were able to estimate large differences in terrapin densities between sites through functions of site-specific environmental covariates (water depth, distance to mangrove, and distance to land). The detection probability was poor (0.28) for the few terrapin occupancy state, but was much greater for many (0.75). The time to detection and distance-sampling approach for this aquatic animal should be useful for other aquatic organisms that regularly surface. Terrapins were generally available to be sighted within four minutes but detection declined rapidly to a low probability of terrapin detection >30 m. The approach of estimating density as a function of habitat covariates to identify habitat associations can provide an effective method that combined with adaptive sampling should be useful to investigate the distribution of terrapins in open water.

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To BRD or Not to BRD? A Test of Bycatch Reduction Devices (BRDs) for the Blue Crab Fishery

Grubbs

Funkhouser

Myer

et al. 2018

N American J Fish Manag

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We compared two bycatch reduction device (BRD) models that were designed to maintain the catch of commercially harvestable blue crabs Callinectes sapidus while excluding diamondback terrapins Malaclemys terrapin. The Virginia BRD (VA BRD) model was a thick-plastic, 5.1-× 15.3-cm, rectangular red frame. The South Carolina BRD (SC BRD) model was a thin-plastic, 5.1-6.4-× 7.3-cm, curved rectangular red frame. Baited crab traps were fished in groups of three (no BRD, VA BRD, and SC BRD) within tidal creeks in Virginia and South Carolina. In Virginia, legal-sized blue crabs from traps with BRDs were 2 mm smaller than those from traps without BRDs. In South Carolina, significantly fewer and smaller crabs were captured in traps with SC BRDs relative to traps with VA BRDs or traps without BRDs. Shorter soak times in South Carolina may have reduced traffic flow of crabs into traps fitted with BRDs, an effect that was overcome by longer soak times in Virginia. Of the 29 diamondback terrapins captured during the Virginia study, 23 were captured in traps without BRDs, 3 were captured in traps with VA BRDs, and 3 were caught in traps with SC BRDs. The BRDs are needed for the blue crab fishery to decrease diamondback terrapin mortality in hot spots where crabbing and terrapin habitat overlap.

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Using spatial and behavioral data to evaluate the seasonal bycatch risk of diamondback terrapins Malaclemys terrapin in crab pots

Cited by 28 publications

References 23 publications

Total body water and water turnover rates in the estuarine diamondback terrapin (Malaclemys terrapin) during the transition from dormancy to activity

Total body water and water turnover rates in the estuarine diamondback terrapin (Malaclemys terrapin) during the transition from dormancy to activity

Sampling rare and elusive species: Florida east coast diamondback terrapin population abundance

To BRD or Not to BRD? A Test of Bycatch Reduction Devices (BRDs) for the Blue Crab Fishery

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