Pollutant exposure in green and hawksbill marine turtles from the Caribbean region

Dyc, Christelle; Debier, Cathy; Leroy, Céline; Delcroix, Eric; Thomé, Jean-Pierre; Das, Krishna

doi:10.1016/j.rsma.2015.09.004

Cited by 26 publications

(21 citation statements)

References 52 publications

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“…Lam et al (2006) also found an HQ worst of Se in C. mydas to be greater than one (HQ worst = 24.5), and therefore at probable levels to cause negative effects in turtle eggs from Hong Kong. Dyc et al, 2015 found Guadeloupian C. mydas and E. imbricata eggs had an HQ worst N 1 for Se and Hg. The HQ best and HQ worst were N 1 for Cd for both species when using PNECs for effects on eggshell thinning; however, b 1 when PNECs for hatchling survival were used.…”

Section: Screening-level Risk Assessmentsmentioning

confidence: 94%

“…Only three publications investigating the effects of contaminants on marine turtles performed a screening-level risk assessment, using hazard quotients (HQs), a measure of the ratio between measured concentrations and predicted no effect concentrations (PNECs; Lam et al, 2006;van de Merwe et al, 2009;Dyc et al, 2015). All three publications calculated HQs using concentrations of contaminants measured in C. mydas eggs; however, Dyc et al (2015) also included E. imbricata.…”

Section: Screening-level Risk Assessmentsmentioning

confidence: 99%

“…All three publications calculated HQs using concentrations of contaminants measured in C. mydas eggs; however, Dyc et al (2015) also included E. imbricata. PNECs used to calculate the HQs were taken from marine turtles and other oviparous reptiles where possible, and derived from studies on birds when data on turtles was lacking.…”

Section: Screening-level Risk Assessmentsmentioning

confidence: 99%

See 2 more Smart Citations

The current state and future directions of marine turtle toxicology research

Finlayson

Leusch

Merwe

2016

Environment International

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Section: Screening-level Risk Assessmentsmentioning

confidence: 94%

Section: Screening-level Risk Assessmentsmentioning

confidence: 99%

Section: Screening-level Risk Assessmentsmentioning

confidence: 99%

See 1 more Smart Citation

The current state and future directions of marine turtle toxicology research

Finlayson

Leusch

Merwe

2016

Environment International

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“…The fat content was determined gravimetrically by evaporating the solvent at 40 C until only the fat remains. The extracts were submitted to clean ups with H 2 SO 4 and then with Florisil solid phase cartridges (Supelco, Envi-Florisil, Bellefonte, PA) according to the method described by Dyc et al, 2015. Five mL of nonane were used as a keeper and the extract was evaporated under a gentle stream of nitrogen.…”

Section: Total Mercury (T-hg) Analysismentioning

confidence: 99%

Spatial variation in the accumulation of POPs and mercury in bottlenose dolphins of the Lower Florida Keys and the coastal Everglades (South Florida)

Kiszka

Heithaus

Scholl

et al. 2017

Environmental Pollution

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a b s t r a c tThe bottlenose dolphin (Tursiops truncatus) is an upper trophic level predator and the most common cetacean species found in nearshore waters of southern Florida, including the Lower Florida Keys (LFK) and the Florida Coastal Everglades (FCE). The objective of this study was to assess contamination levels of total mercury (T-Hg) in skin and persistent organic pollutants (PCBs, PBDEs, DDXs, HCHs, HCB, S PCDD/Fs and S DL-PCBs) in blubber samples of bottlenose dolphins from LFK (n ¼ 27) and FCE (n ¼ 24). PCBs were the major class of compounds found in bottlenose dolphin blubber and were higher in individuals from LFK (S 6 PCBs LFK males: 13,421 ± 7730 ng g À1 lipids, S 6 PCBs LFK females: 9683 ± 19,007 ng g À1 lipids)than from FCE (S 6 PCBs FCE males: 5638 ng g À1 ± 3627 lipids, S 6 PCBs FCE females: 1427 ± 908 ng g À1 lipids). These levels were lower than previously published data from the southeastern USA. The S DLPCBs were the most prevalent pollutants of dioxin and dioxin like compounds (S DL-PCBs LFK: 739 ng g À1 lipids, S DL-PCBs FCE: 183 ng g À1 lipids) since PCDD/F concentrations were low for both locations (mean 0.1 ng g À1 lipids for LFK and FCE dolphins). The toxicity equivalences of PCDD/Fs and DLPCBs expressed as TEQ in LFK and FCE dolphins is mainly expressed by DL-PCBs (81% LFK -65% FCE). T-Hg concentrations in skin were significantly higher in FCE (FCE median 9314 ng g À1 dw) compared to LFK dolphins (LFK median 2941 ng g À1 dw). These concentrations are the highest recorded in bottlenose dolphins in the southeastern USA, and may be explained, at least partially, by the biogeochemistry of the Everglades and mangrove sedimentary habitats that create favourable conditions for the retention of mercury and make it available at high concentrations for aquatic predators.

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“…However, field studies have indicated the potential toxicity of selenium in these vertebrates as documented for American alligator Alligator mississipiensis (Roe et al 2004) and marine turtles (Lam et al 2006;van de Merwe et al 2009;Perrault et al 2013;Dyc et al 2015). For the first time, the present study investigated the toxicity and kinetics of selenium towards freshwater turtle specie, the slider turtle Trachemys scripta.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 96%

Toxicokinetics of selenium in the slider turtle, Trachemys scripta

et al. 2016

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Selenium (Se) is an essential element that can be harmful for wildlife. However, its toxicity in poikilothermic amniotes, including turtles, remains poorly investigated. The present study aims at identifying selenium toxicokinetics and toxicity in juvenile slider turtles (age: 7 months), Trachemys scripta, dietary exposed to selenium, as selenomethionine SeMet, for eight weeks. Nondestructive tissues (i.e. carapace, scutes, skin and blood) were further tested for their suitability to predict selenium levels in target tissues (i.e. kidney, liver and muscle) for conservation perspective. 130 juvenile yellow-bellied slider turtles were assigned in three groups of 42 individuals each (i.e. control, SeMet 1 and SeMet 2 ). These groups were subjected to a feeding trial including an eight-week supplementation period SP 8 and a following 4-week elimination period EP 4 . During the SP 8 , turtles fed on diet containing 1.1 ± 0.04, 22.1 ± 1.0 and 45.0 ± 2.0 lg g -1 of selenium (control, SeMet 1 and SeMet 2 , respectively). During the EP 4 , turtles fed on non-supplemented diet. At different time during the trial, six individuals per group were sacrificed and tissues collected (i.e. carapace, scutes, skin, blood, liver, kidney, muscle) for analyses. During the SP 8 (Fig. 1), both SeMet 1 and SeMet 2 turtles efficiently accumulated selenium from a SeMet dietary source. The more selenium was concentrated in the food, the more it was in the turtle body but the less it was removed from their tissues. Moreover, SeMet was found to be the more abundant selenium species in turtles' tissues. Body condition (i.e. growth in mass and size, feeding behaviour and activity) and survival of the SeMet 1 and SeMet 2 turtles seemed to be unaffected by the selenium exposure. There were clear evidences that reptilian species are differently affected by and sensitive to selenium exposure but the lack of any adverse effects was quite unexpected.

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Pollutant exposure in green and hawksbill marine turtles from the Caribbean region

Cited by 26 publications

References 52 publications

The current state and future directions of marine turtle toxicology research

The current state and future directions of marine turtle toxicology research

Spatial variation in the accumulation of POPs and mercury in bottlenose dolphins of the Lower Florida Keys and the coastal Everglades (South Florida)

Toxicokinetics of selenium in the slider turtle, Trachemys scripta

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