[MARMAM] New publications on the use of PCBs as tracers of feeding ecology and biopsy sampling in contamination assessment studies

Paula Mendez Fernandez paula.mendez_fernandez at univ-lr.fr
Thu Nov 24 01:09:43 PST 2016


 

Dear MARMAM colleagues,

 It is with great pleasure that my
co-authors and I would like to share our most recent publication in
Ecological Indicators and a less recent publication in Marine Pollution
Bulletin: 

Méndez-Fernandez P, Simon-Bouhet B, Bustamante P, Chouvelon
T, Ferreira M, López A, Moffat CF, Pierce GJ, Russell M, Santos MB,
Spitz J, Vingada JV, Webster L, Read FL, González AF, Caurant F (2017).
INTER-SPECIES DIFFERENCES IN POLYCHLORINATED BIPHENYLS PATTERNS FROM
FIVE SYMPATRIC SPECIES OF ODONTOCETES: CAN PCBS BE USED AS TRACERS OF
FEEDING ECOLOGY? Ecological Indicators, Volume 74, March 2017, Pages
98-108. 

Abstract 

Concentrations of thirty two polychlorinated
biphenyls (PCBs) were determined in the blubber of five sympatric
species of odontocetes stranded or by-caught along the Northwest coast
of the Iberian Peninsula: common dolphin (_Delphinus delphis_),
long-finned pilot whale (_Globicephala melas_), harbour porpoise
(_Phocoena phocoena_), striped dolphin (_Stenella coeruleoalba_) and
bottlenose dolphin (_Tursiops truncatus_). Multivariate analyses were
applied to evaluate the ability of PCB patterns to discriminate these
sympatric species and to determine which eco-biological factors
influence these patterns, thus evaluating the relevance of PCB
concentrations as biogeochemical tracers of feeding ecology. The five
species could be separated according to their PCB patterns. Different
exposure to these contaminants, a consequence of their different dietary
preferences or habitats, together with potentially dissimilar metabolic
capacities, likely explain these results; sex, age, habitat and the type
of prey eaten were the most important eco-biological parameters of those
tested. Although, no single congener has been specifically identified as
a tracer of feeding ecology, 4 congeners from the 22 analysed seemed to
be the most useful and around 12 congeners appear to be enough to
achieve good discrimination of the cetaceans studied. Therefore, this
study suggests that PCB patterns can be used as tracers for studying the
feeding ecology, sources of contamination or even population structure
of cetacean species from the Northwest Iberian Peninsula.


Méndez-Fernandez P, Galluzzi Polesi P, Taniguchi S, Santos MC de O,
Montone RC (2016). VALIDATING THE USE OF BIOPSY SAMPLING IN
CONTAMINATION ASSESSMENT STUDIES OF SMALL CETACEANS. Marine Pollution
Bulletin, Volume 107, Issue 1, 15 June 2016, Pages 364-369. 

Abstract


Remote biopsy sampling is the most common technique for acquiring
samples from free-ranging marine mammals. However, such techniques may
result in variable sampling being sometimes superficial skin and blubber
biopsies. For decades, blubber has been used to monitor the exposure of
marine mammals to persistent organic pollutants (POPs), but little is
known regarding the variability of POPs as a function of blubber depth
in small cetaceans and the available literature offers variable results.
Thus, the aim of the present study was to validate biopsy sampling for
monitoring contaminant concentrations in small, free-ranging cetaceans.
Samples from the dorsal blubber of 10 incidentally captured Atlantic
spotted dolphins (_Stenella frontalis_) were separated into two
different layers (outer and inner) to investigate the influence of
sampling depth on POP concentrations. POP concentrations were compared
to those of the full blubber layer. The results revealed no significant
differences in lipid content between males and females or among the
inner, outer and full blubber layers (p > 0.05). Moreover, the wet and
lipid weight concentrations of all POP classes analysed [i.e.
polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethanes
(DDTs), polybrominated diphenyl ethers (PBDEs), hexachlorobenzene (HCB),
hexachlorocyclohexanes (HCHs), chlordanes (CHLs) and mirex] did not
differ significantly with blubber depth (p > 0.05). POP classes followed
the same decreasing order of wet weight concentrations in blubber layers
and full blubber: PCBs > DDTs > PBDEs > mirex > HCB > HCHs > CHLs.
Moreover, there was a low degree of differentiation in the accumulation
of POP congeners. The present findings indicated that the distribution
of contaminants was homogenous with blubber depth, which validates the
use of biopsy sampling for the assessment of contaminants in small
cetaceans. 

Full text and PDF files can be downloaded here


https://authors.elsevier.com/a/1U5cJ,XRNLRQ55 [1] 

and here


http://www.sciencedirect.com/science/article/pii/S0025326X16302223


Alternatively, please send PDF requests to
paula.mendez_fernandez at univ-lr.fr 

All the best 

Paula 




Links:
------
[1] https://authors.elsevier.com/a/1U5cJ,XRNLRQ55
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