Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris)
Northern elephant seals, Mirounga angustirostris, are exceptional mammals: females fast entirely during nursing while their pups may quadruple in weight over the 25-day suckling period. Females thus lose approximately a third of body mass and produce energy-rich milk with a high fat content. Stable...
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ftorbi:oai:orbi.ulg.ac.be:2268/5747 2024-04-21T08:01:28+00:00 Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) Habran, Sarah Debier, Cathy Lepoint, Gilles Crocker, Daniel Houser, Dorian Das, Krishna 2007-11-30 https://orbi.uliege.be/handle/2268/5747 en eng https://orbi.uliege.be/handle/2268/5747 info:hdl:2268/5747 17th Biennial Conference on the Biology of Marine Mammals, Cape Town, South Africa [ZA], du 29 novembre 2007 au 3 décembre 2007 Life sciences Environmental sciences & ecology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Sciences aquatiques & océanologie conference paper not in proceedings http://purl.org/coar/resource_type/c_18cp info:eu-repo/semantics/conferencePaper 2007 ftorbi 2024-03-27T14:43:11Z Northern elephant seals, Mirounga angustirostris, are exceptional mammals: females fast entirely during nursing while their pups may quadruple in weight over the 25-day suckling period. Females thus lose approximately a third of body mass and produce energy-rich milk with a high fat content. Stable carbon and nitrogen isotope ratios (d13C and d15N used as diet markers) and total mercury concentrations (Hg) were measured in tissues (blood cells, serum, full blood, milk and blubber) from 20 mother-pup pairs on days 4 and 21 of lactation. A systematic difference was observed between isotopic values in blood cells and serum of the mothers, linked to diet and distinct biochemical composition between blood components. d13C differed between inner and outer blubber layers and were similar between inner blubber and milk. High Hg concentrations (up to 350 ng.g-1ww at the beginning of lactation) were found in the blood of mother elephant seals linked to their high d15N values in blood cells. Hg transfer through placenta and milk was observed between mothers and pups. A significant increase of blood Hg concentration in mothers (+285 ng.g-1ww) and a decrease in pups (-93 ng.g-1ww) were observed between days 4 and 21 of lactation. Both processes were explained by a remobilization of proteins and lipids during fasting and milk production in mothers and by a dilution of Hg in pups due to their high mass increase during this period. This study confirms that lactation modifies stable nitrogen isotope ratios in tissues, as well as mercury levels in blood from mothers and pups, and highlights the existence of a transplacental and transmammary transfer of mercury in northern elephant seals. Therefore, physiological processes and body condition should be considered carefully when interpreting stable isotope ratios and Hg concentrations in the framework of biomonitoring. Conference Object Elephant Seals University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Life sciences Environmental sciences & ecology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Sciences aquatiques & océanologie |
spellingShingle |
Life sciences Environmental sciences & ecology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Sciences aquatiques & océanologie Habran, Sarah Debier, Cathy Lepoint, Gilles Crocker, Daniel Houser, Dorian Das, Krishna Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) |
topic_facet |
Life sciences Environmental sciences & ecology Aquatic sciences & oceanology Sciences du vivant Sciences de l’environnement & écologie Sciences aquatiques & océanologie |
description |
Northern elephant seals, Mirounga angustirostris, are exceptional mammals: females fast entirely during nursing while their pups may quadruple in weight over the 25-day suckling period. Females thus lose approximately a third of body mass and produce energy-rich milk with a high fat content. Stable carbon and nitrogen isotope ratios (d13C and d15N used as diet markers) and total mercury concentrations (Hg) were measured in tissues (blood cells, serum, full blood, milk and blubber) from 20 mother-pup pairs on days 4 and 21 of lactation. A systematic difference was observed between isotopic values in blood cells and serum of the mothers, linked to diet and distinct biochemical composition between blood components. d13C differed between inner and outer blubber layers and were similar between inner blubber and milk. High Hg concentrations (up to 350 ng.g-1ww at the beginning of lactation) were found in the blood of mother elephant seals linked to their high d15N values in blood cells. Hg transfer through placenta and milk was observed between mothers and pups. A significant increase of blood Hg concentration in mothers (+285 ng.g-1ww) and a decrease in pups (-93 ng.g-1ww) were observed between days 4 and 21 of lactation. Both processes were explained by a remobilization of proteins and lipids during fasting and milk production in mothers and by a dilution of Hg in pups due to their high mass increase during this period. This study confirms that lactation modifies stable nitrogen isotope ratios in tissues, as well as mercury levels in blood from mothers and pups, and highlights the existence of a transplacental and transmammary transfer of mercury in northern elephant seals. Therefore, physiological processes and body condition should be considered carefully when interpreting stable isotope ratios and Hg concentrations in the framework of biomonitoring. |
format |
Conference Object |
author |
Habran, Sarah Debier, Cathy Lepoint, Gilles Crocker, Daniel Houser, Dorian Das, Krishna |
author_facet |
Habran, Sarah Debier, Cathy Lepoint, Gilles Crocker, Daniel Houser, Dorian Das, Krishna |
author_sort |
Habran, Sarah |
title |
Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) |
title_short |
Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) |
title_full |
Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) |
title_fullStr |
Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) |
title_full_unstemmed |
Lactation effect on the trace element dynamics in northern elephant seals (Mirounga angustirostris) |
title_sort |
lactation effect on the trace element dynamics in northern elephant seals (mirounga angustirostris) |
publishDate |
2007 |
url |
https://orbi.uliege.be/handle/2268/5747 |
genre |
Elephant Seals |
genre_facet |
Elephant Seals |
op_source |
17th Biennial Conference on the Biology of Marine Mammals, Cape Town, South Africa [ZA], du 29 novembre 2007 au 3 décembre 2007 |
op_relation |
https://orbi.uliege.be/handle/2268/5747 info:hdl:2268/5747 |
_version_ |
1796941635311894528 |