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Sphyrna lewini

Many marine species also possess the tyrosinase-mediated pathway to synthesize the UV-absorbing pigment melanin. Melanin occurs in a wide range of taxa including bacteria, fungi, invertebrates, and chordates. While much is known about the role of melanin in the UV protection of mammalian skin, very little research has been conducted to examine the efficiency of melanin as a UV-protective mechanism in aquatic taxa.9 It is known that melanin levels in juvenile hammerhead sharks, Sphyrna lewini, are directly correlated to solar UV exposure in the freshwater crustacean Daphnia pulex, melanin concentrations are genetically determined within populations and are correlated to UV sensitivity.50-51 The few studies that have been undertaken suggest that melanin has an important role in UV protection in aquatic environments. [Pg.485]

Sphyrna lewini Scalloped hammerhead Muscle Altata-Ensenada del Pabellon 4.84 Ruelas-lnzunza and... [Pg.80]

Sphyrna lewini Scalloped hammerhead Muscle Gulf of California 3.56 Garcia-Hernandez et al. (2007)... [Pg.80]

Sphyrna lewini Scalloped hammerhead Liver Sinaloa state 0.83 Hurtado-Banda et al. (2012)... [Pg.81]

Ruelas-Inzunza et al. (2011a) evaluated the hazard quotient (HQ) for the NW Mexico population, based on the Hg content that existed in fish and shrimp they consumed. Though fish and shrimp consumption (9.01 kg person" year and 1.49 kg person" year, respectively) are lower than the world average, these authors found that organisms like Caranx caninus and the top predator Sphyrna lewini represented a potential health risk for consumers, mainly to fishermen and their families who consume two or three times more seafood than an average person. Levy et al. (2004) states that children are more vulnerable to the effects of mercury, and... [Pg.89]


See other pages where Sphyrna lewini is mentioned: [Pg.86]    [Pg.44]    [Pg.48]    [Pg.86]    [Pg.44]    [Pg.48]   
See also in sourсe #XX -- [ Pg.43 , Pg.44 ]




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