Metal Assimilation Results from the Interaction of Prey- and Predator-Dependent Processes

Wallace, William G.; Goto, Daisuke; Seebaugh, David R.

doi:10.1897/1551-3793(2008)4[375:marfti]2.0.co;2

Cited by 2 publications

(3 citation statements)

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“…Although some studies have demonstrated a direct 1:1 relationship between metal storage in the diet and metal assimilation in consumers (Reinfelder and Fisher 1991;Reinfelder and Fisher 1994;Wallace and Lopez 1996), others have often failed to find any consistent relationship (e.g., Rainbow et al 2006;Zhang and Wang 2006;Steen Redeker et al 2007). Except for some invertebrates with simple digestive physiology (e.g., copepods and bivalve larvae) (Reinfelder and Fisher 1991;Hutchins et al 1995;Mason et al 1995), it may be oversimplifying to seek a direct relationship between metal storage in prey and metal assimilation in predators without incorporating other physiological and biochemical processes (Wallace et al 2008). Based on the current study, the TAM compartment should be redefined as fractions that are only available to (but not necessarily assimilated by) predators.…”

Section: Potential Mechanisms Of Trophic Transfer Of CD and Ch 3 Hgmentioning

confidence: 99%

“…Based on the current study, the TAM compartment should be redefined as fractions that are only available to (but not necessarily assimilated by) predators. Each predator's particular digestive physiology is likely to determine whether the available fractions in prey are equivalent to the assimilated fractions by predator (Wallace et al 2008).…”

Section: Potential Mechanisms Of Trophic Transfer Of CD and Ch 3 Hgmentioning

confidence: 99%

“…A significant relationship (approximately 1:1) between metal storage in a variety of prey species and metal solubilization in the digestive tract of mummichogs observed in this study shows that intracellular partitioning of metals in prey does contribute to metal trophic availability in the gut environment. However, a variety of physiological and biochemical processes in the gut environment of the predator may complicate and obscure the direct relationship between metal intracellular storage in prey and actual assimilation into the predator's tissues (Wallace et al 2008).…”

Section: Potential Mechanisms Of Trophic Transfer Of CD and Ch 3 Hgmentioning

confidence: 99%

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Influences of prey- and predator-dependent processes on cadmium and methylmercury trophic transfer to mummichogs (Fundulus heteroclitus)

Goto

Wallace

2009

Can. J. Fish. Aquat. Sci.

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Factors affecting CH3Hg and Cd trophic transfer from six invertebrates and a juvenile fish prey to mummichogs (Fundulus heteroclitus) were investigated using prey-dependent and predator-dependent approaches. Prey-specific trophic availability of metals to mummichogs was estimated using a subcellular partitioning approach (i.e., trophically available metals (TAM), as originally proposed by Wallace and Luoma (2003)). The proportions of CH3Hg partitioned to TAM (CH3Hg-TAM%) ranged from 39.7% to 82.7%, while the proportions of Cd partitioned to TAM (Cd-TAM%) ranged from 51.8% to 67.4%. CH3Hg-TAM% and Cd-TAM% were significantly correlated with the proportions of metals released from prey by in vitro solubilization with mummichog gut fluid (i.e., gut solubilizable metals (GSM)), CH3Hg-GSM% and Cd-GSM%, respectively. This relationship suggests that the majority of CH3Hg and Cd partitioned as TAM in prey were solubilized in the digestive tract of mummichogs. Mummichogs retained 52.7% to 73.7% of the ingested CH3Hg, which was comparable with prey-specific CH3Hg-TAM% and CH3Hg-GSM%. However, mummichogs retained only 3.2%-11.0% of ingested Cd, which was substantially lower than Cd-TAM% or Cd-GSM%. These results suggest that solubilizable, prey-associated CH 3 Hg was transported through the gut membrane of mummichogs, whereas the majority of preyassociated Cd was excluded and subsequently eliminated, regardless of its subcellular partitioning.Résumé : Nous avons étudié les facteurs qui affectent le transfert trophique de CH 3 Hg et de Cd de six proies invertébrées et d'un jeune poisson proie au choquemort (Fundulus heteroclitus) en utilisant des approches dépendantes des proies et dé-pendantes des prédateurs. Nous avons estimé la disponibilité trophique des métaux aux choquemorts spécifique à chaque proie à l'aide de la méthode de partitionnement subcellulaire (c'est-à-dire les métaux trophiquement disponibles (TAM), méthode proposée au départ par Wallace et Luoma (2003)). Les proportions du CH 3 Hg réparti en TAM (CH 3 Hg-TAM%) varient de 39,7 % à 82,7 %, alors que les portions du Cd partitionné (Cd-TAM%) varient de 51,8 % à 67,4 %. Il y a une corrélation significative entre CH 3 Hg-TAM% et Cd-TAM% et les proportions de métaux libérés des proies par une solubilisation in vitro avec du liquide provenant du tube digestif de choquemorts (c'est-à-dire, les métaux solubilisables dans le tube digestif (GSM)), respectivement CH 3 Hg-GSM% et Cd-GSM%. Cette relation laisse croire que la plus grande partie du CH 3 Hg et du Cd partitionnés en TAM chez les proies est solubilisée dans le tube digestif des choquemorts. Les choquemorts retiennent 52,7 % à 73,7 % du CH 3 Hg ingéré, ce qui se compare aux CH 3 Hg-TAM% et CH 3 Hg-GSM% spécifi-ques aux proies. Cependant, les choquemorts ne retiennent que 3,2 % à 11.0 % du Cd ingéré, ce qui est considérablement plus bas que les valeurs de Cd-TAM% et Cd-GSM%. Ces résultats indiquent que le CH3Hg solubilisable associé aux proies est transporté à travers la membrane du tube digestif des choquemort...

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Section: Potential Mechanisms Of Trophic Transfer Of CD and Ch 3 Hgmentioning

confidence: 99%

Section: Potential Mechanisms Of Trophic Transfer Of CD and Ch 3 Hgmentioning

confidence: 99%

Section: Potential Mechanisms Of Trophic Transfer Of CD and Ch 3 Hgmentioning

confidence: 99%

See 1 more Smart Citation

Influences of prey- and predator-dependent processes on cadmium and methylmercury trophic transfer to mummichogs (Fundulus heteroclitus)

Goto

Wallace

2009

Can. J. Fish. Aquat. Sci.

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Assimilation and subcellular partitioning of elements by grass shrimp collected along an impact gradient

Seebaugh

Wallace

2009

Aquatic Toxicology

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Metal Assimilation Results from the Interaction of Prey- and Predator-Dependent Processes

Cited by 2 publications

References 8 publications

Influences of prey- and predator-dependent processes on cadmium and methylmercury trophic transfer to mummichogs (Fundulus heteroclitus)

Influences of prey- and predator-dependent processes on cadmium and methylmercury trophic transfer to mummichogs (Fundulus heteroclitus)

Assimilation and subcellular partitioning of elements by grass shrimp collected along an impact gradient

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