Iodine speciation in chesapeake bay waters

Luther, George W.; Cole, H.S.

doi:10.1016/0304-4203(88)90039-4

Cited by 60 publications

(30 citation statements)

References 14 publications

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“…Given the above, our results are consistent with the findings by Luther and Cole (1988) and Ullman et al (1988) that total iodine concentrations in Chesapeake Bay and some other North American estuaries plotted consistently higher than the line depicting conservative mixing between the fresh water end-member and a marine one immediately outside the Bay; within the Bay, iodide was released from the sediments to augment the water column concentration. Interestingly, Ullman et al (1988) were cautious about these findings because the differences were not large and the phenomenon had not been recorded previously.…”

Section: Corroborating Examples Of Similar Observationssupporting

confidence: 93%

“…Temperate and polar waters which are well offshore are subjected to vertical exchange during winter but, so far, it is only in polar waters that a seasonal change in iodate and iodide concentrations has been observed; Chance et al (2010) report finding concentrations of iodide of up to 150 nM during summer, which can be linked to biological activity. In anoxic waters such as the Black Sea (Luther 1991;Luther and Campbell 1991;Truesdale et al 2001b), some deep trenches (Wong and Brewer 1977;Wong et al 1985;Ullman et al 1990), and parts of some estuaries (e.g., Luther and Cole 1988;Abdel-Moati 1999;Truesdale et al 2001a), only iodide is present. There is also mounting evidence that iodate can be reduced (chemically) in hypoxic waters (Stipaničev and Branica 1996;Ž ic and Branica 2006a;Ž ic et al 2008.…”

mentioning

confidence: 99%

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Preliminary Evidence for Iodate Reduction in Bottom Waters of the Gulf of Mexico During an Hypoxic Event

Chapman

Truesdale

2011

Aquat Geochem

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The distributions of iodate and total inorganic iodine concentrations in the waters on the Texas-Louisiana shelf in April, June, and August 2004 are described. Iodine-salinity graphs show three-end-member mixing involving onshore and offshore surface waters and deep offshore water. The April survey showed simple mixing on the surface, but in the later surveys, iodate concentrations were often much lower than predicted by the mixing curve while those for total inorganic iodine were higher. This demonstrated both iodate reduction in the water and iodide addition, although individual samples did not show equivalent speciation changes. Hydrographically, the system consists of the estuaries of the Mississippi and Atchafalaya rivers as they spill onto the shelf. The waters are stratified seasonally by a robust halocline, leading to hypoxia in the bottom waters from the combined effect of restricted downward diffusion of oxygen and the sinking of the luxuriant growth of phytoplankton induced by riverine nutrient supply. The distributions of iodate and total inorganic iodine are, therefore, interpreted in terms of water-sediment interaction as the shelf shoals to the north.

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Section: Corroborating Examples Of Similar Observationssupporting

confidence: 93%

mentioning

confidence: 99%

Preliminary Evidence for Iodate Reduction in Bottom Waters of the Gulf of Mexico During an Hypoxic Event

Chapman

Truesdale

2011

Aquat Geochem

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“…However, for Aurelia aurita, Hernroth & Grondahl (1985) believed that temperature change did not trigger strobilation because spring warming only occurred in the surface layer above the Whether the higher strobilation at salinities >10Y6, relative to that at salinities ~1 0 %~ is directly related to salinity or corresponding iodide levels is not known. Luther & Cole (1988) showed that iodide concentration was directly related to salinity; in our experiments, iodide would have ranged from 67 nM at 5";" salinity to 470 nM at 35'1.k salinity. Scyphistomae of Chrysaora quinquecirrha accumulated iodide against a concentration gradient (Black & Webb 1973), and the rate of accumulation increased with increasing temperatures (Olmon & Webb 1974).…”

Section: Effects Of Foodmentioning

confidence: 42%

“…Salinity has not been identified as a likely trigger for strobilation in other scyphomedusae (Spangenberg 1968, Hernroth & Grondahl 1985; however, salinity and iodide concentrations are linearly correlated (Luther & Cole 1988), and iodide is required for strobilation by scyphistomae, which synthesize thyroxine and related compounds (Spangenberg 1967, 1968, 197 l , Black & Webb 1973, Silverstone et al 1978. Both Aurelia aurita and C. quinquecirrha showed increased strobi1ati.on with increasing iodide concentrations (1 to 100 mM, Spangenberg 1967, and There has been speculation that eutrophication of coastal waters has lead to increased populations of jellyfish (Parsons et al 1977).…”

Section: Mar Ecol Prog Sermentioning

confidence: 99%

Temperature, salinity and food effects on asexual reproduction and abundance of the scyphozoan Chrysaora quinquecirrha

Purcell¹,

White²,

Nemazie³

et al. 1999

Mar. Ecol. Prog. Ser.

121

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Outbreaks of jellyfish are reported worldwide, yet the environmental factors that control the sizes of jellyfish populations are not well understood. The scyphomedusan Chrysaora quinquecirrha occurs in the mesohaline portion of Chesapeake Bay each summer. Population sizes of the medusae show dramatic annual variations that are correlated with salinity and temperature. We measured the total numbers of ephyrae and polyps produced by benthic polyps of C. quinquecirrha in laboratory experiments lasting 42 d, and found that temperature (15. 20, 25°C) was not a statistically significant factor at low salinities (5 to 20P:m); however, ephyra production increased significantly with increasing temperature at high salinities (20 to 35%). Conversely, each 5°C decrease in temperature delayed strobilation (ephyra production) by about 1 wk. Salinity significantly affected the numbers of ephyrae and polyps produced in all experiments. Ephyra and polyp production was lower at both low (

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“…The mechanism underlying the negative effect of low salinity on strobilation may be related to the dependence of strobilation on iodide and the synthesis of thyroxin (Black & Webb 1973, Silverstone et al 1978. Iodide concentration is directly proportional to salinity (Luther & Cole 1988), and thus, at very low salinities, iodide may be insufficient for strobilation (Purcell et al 1999). The physical tolerance of Chrysaora quinquecirrha may also be reflected in the spatial and temporal distributions of benthic polyps and free-swimming ephyrae.…”

Section: Effects Of Temperature and Salinity On Chrysaora Quinquecirrmentioning

confidence: 99%

Predicting the distribution of the scyphomedusa Chrysaora quinquecirrha in Chesapeake Bay

Decker¹,

Brown²,

Hood³

et al. 2007

Mar. Ecol. Prog. Ser.

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Jellyfish blooms are important events controlling plankton dynamics in coastal waters worldwide, yet factors that influence bloom development are not well understood. We used the scyphomedusa Chrysaora quinquecirrha as a model to examine physical factors that control jellyfish populations and to develop an ecological forecasting system. Over 700 in situ observations collected from Chesapeake Bay and its tributaries during 1987-2000 were used to develop habitat models that predict the probability of occurrence and the likely concentration of medusae as a function of seasurface temperature and salinity. Medusae were found within a relatively narrow range of temperature (26 to 30°C) and salinity (10 to 16). Regression analyses reveal that a combination of temperature and salinity is a significant predictor of medusa occurrence. Assessments of the predictive performance of these models using medusae and environmental data collected at independent survey sites (n = 354) indicated that model-predicted medusa occurrence and concentration correspond well with observations. Our models can be forced with near-real time and retrospective estimates of temperature and salinity to generate probability of occurrence maps of C. quinquecirrha medusa presence and abundance in order to better understand how this top predator varies in space and time, and how this species could potentially affect energy flow through the Chesapeake Bay system.

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Iodine speciation in chesapeake bay waters

Cited by 60 publications

References 14 publications

Preliminary Evidence for Iodate Reduction in Bottom Waters of the Gulf of Mexico During an Hypoxic Event

Preliminary Evidence for Iodate Reduction in Bottom Waters of the Gulf of Mexico During an Hypoxic Event

Temperature, salinity and food effects on asexual reproduction and abundance of the scyphozoan Chrysaora quinquecirrha

Predicting the distribution of the scyphomedusa Chrysaora quinquecirrha in Chesapeake Bay

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