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Title

Exploring the relationship between carboxylesterase activity and trophic habits of abundant and threatened chondrichthyans in the Western Mediterranean

AuthorsNos, David ; Navarro, Joan ; Barría, Claudio ; Coll, Marta ; Solé, Montserrat
Issue DateSep-2016
PublisherNew European Society for Comparative Physiology and Biochemistry
Citation30th ESCPB Congress : Unraveling complexity: from molecules to ecosystems : Book of abstracts: 30 (2016)
AbstractEsterase activity is a good biomarker to detect exposure to organophosphates (OP) and other xenobiotic contaminants in the environment. Although these enzymes are present in all organisms, not many studies have been conducted in Chondrichthyans. In the present study, we examined the activities of these enzymes in 23 rare, endangered and common elasmobranch species inhabiting the Western Mediterranean Sea. In particular, we determined carboxylesterase (CbE) and butyrylcholinesterase (BChE) activities in the liver of 11 sharks, 11 rays and 1 chimaera. Moreover, by using intrinsic trophic markers (stable isotopic analyses and isotopic mixing models) we related the activity of these enzymes with the trophic habits at both individual and population level. Hepatic BChE activity was very low for all species, mostly under 1 nmol/min/mg prot. CbE activity showed a strong intraspecific variability, without any relationship with the body measures (body length and body mass) of the individuals. Within elasmobranch groups, we found differences in CbE activities between sharks and rays and between species belonging to the same subfamily. Also, we found a negative relationship between CbE activity and trophic habits (δ13C and δ15N measured in the muscle of the same individuals, with p-values of 0.0017 and 0.0008, respectively). Within the ecosystem, most of the Chondrichthyans are located in high trophic positions. This makes them likely to accumulate contaminants and they could be used as good sentinels to assess contaminant exposures; and esterase activities could be a potentially good biomarker of choice
Description30th New European Society for Comparative Physiology and Biochemistry (ESCPB) Congress, Unraveling complexity: from molecules to ecosystems, 4-7 September 2016, Barcelona.-- 1 page
URIhttp://hdl.handle.net/10261/171593
Appears in Collections:(ICM) Comunicaciones congresos
(EBD) Comunicaciones congresos
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