Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil.

Anais da Academia Brasileira de Ciencias

PubMedID: 27254456

Bittar VT, Rezende CE, Kehrig HA, Beneditto AP. Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil. An Acad Bras Cienc. 2016;.
The trophic transfer of total mercury (THg) and its bioaccumulation from prey species to the predator fish Trichiurus lepturus was analysed in coastal waters of southeastern Brazil to evaluate the trace element dynamic in this predator-prey system. The isotopic (d13C and d15N) relation between this predator and its prey allowed inferences on prey assimilation and predator feeding habits. The THg increment varied from 4. 5 to 19. 5 times between prey and predator, with a biomagnification power of 0. 59. The prey species could be divided into three groups regarding d15N values: i) 13. 6 to 13. 2‰ (juvenile conspecifics, Pellona harroweri, and Peprilus paru); ii) 12. 5 to 11. 8‰ (Chirocentrodon bleekerianus, Lycengraulis grossidens, and Dorytheuthis plei); and iii) 10. 5‰ (Xiphopenaeus kroyeri). Based on d13C values, the prey groups were: i) -15. 3‰ (X. kroyeri); ii) -17. 6 to -16. 8‰ (C. bleekerianus, D. plei, P. harroweri, P. paru, and juvenile conspecifics); and iii) -18. 7‰ (L. grossidens). The values of THg and d15N highlighted juvenile conspecifics as the main via of this trace element and the most assimilated prey. The isotopic relation between predator and its prey species showed a feeding activity preferably coastal and pelagic.