Staff Directory > Lacoue-Labarthe Thomas

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Research officer (CR2 CNRS)
La Rochelle University

Keywords : trace element, bioaccumulation, ocean acidification, cephalopod, early-life stages

Research topics
The accumulation of greenhouse gases in atmosphere over the course of this century will have profound consequences on ocean such as the warming (+3°C) and the acidification (-0.2/0.4 pH units) of sea surface waters. In northern Europe, the expected increasing precipitations will foster agricultural runoff or contamination of the near- shore zones by organic and inorganic contaminants released in the environment. As the highly productive coastal zones serve as nursery grounds for many marine species of ecological and commercial importance (e.g. cephalopod), studying interaction between multiple stressors is critical to project the future of coastal ecosystems. In this context, using among others radiotracer tools, my research activities focus on:
-  The metal metabolism in coastal cephalopods, with particular interest for the early life stages.
-  The effect of ocean warming and acidification on metal bioaccumulation capacities and detoxification.
-  The impact of combined stressors on the individual performances.

Figure 1. Tissue section (top) and autoradiogram (bottom) of Octopus vulgaris eggs at stage XVI after exposure to dissolved 110mAg for 1 week; c: chorion, e: embryo, iy: inner yolk sac, oy: outer yolk sac.

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Publications :

[hal-01346620] Near-future pH conditions severely impact calcification, metabolism and the nervous system in the pteropod Heliconoides inflatus

20 July 2016

Shelled pteropods play key roles in the global carbon cycle and food webs of various ecosystems. Their thin external shell is sensitive to small changes in pH, and shell dissolution has already been observed in areas where aragonite saturation state is ~1. A decline in pteropod abundance has (...)

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[hal-01330645] Ecotoxicology of early-life stages in the common cuttlefish Sepia officinalis: review and perspectives

13 June 2016

Cephalopods, and among them, the cuttlefish Sepia officinalis, are well-known to highly accumulate both organic and inorganic contaminants in their tissues. According to their ecology, embryonic and juvenile development occurs in coastal waters and is thus particularly subjected to (...)

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[hal-01253944] Impacts of ocean acidification in a warming Mediterranean Sea: An overview

12 January 2016

Mediterranean Sea fisheries supply significant local and international markets, based largely on small pelagic fish, artisanal fisheries and aquaculture of finfish (mainly seabass and seabream) and shellfish (mussels and oysters). Fisheries and aquaculture contribute to the economy of countries (...)

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[hal-01253916] Limited effects of increased CO2 and temperature on metal and radionuclide bioaccumulation in a sessile invertebrate, the oyster Crassostrea gigas

12 January 2016

This study investigated the combined effects of reduced pH and increased temperature on the capacities of the Pacific cupped oyster Crassostrea gigas to bioconcentrate radionuclide and metals. Oysters were exposed to dissolved radiotracers (110mAg, 241Am, 109Cd, 57Co, 54Mn, and 65Zn) at three (...)

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[hal-01217273] Trophic transfer of radioisotopes in Mediterranean sponges through bacteria consumption

21 October 2015

Numerous field studies highlighted the capacities of marine sponges to bioaccumulate trace elements and assessed their potential as biomonitors of the marine environment. Experimental works demonstrated that dissolved metals and radionuclides can be taken up directly by sponge tissues but, to (...)

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[hal-01188807] Depletion of Essential Fatty Acids in the Food Source Affects Aerobic Capacities of the Golden Grey Mullet Liza aurata in a Warming Seawater Context

1 September 2015

The objective of this study was to evaluate the combined effects of thermal acclimation and n-3 highly unsaturated fatty acids (n-3 HUFA) content of the food source on the aerobic capacities of fish in a thermal changing environment. The model used was the golden grey mullet Liza aurata, a (...)

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[hal-01186129] Mercury in wintering seabirds, an aggravating factor to winter wrecks?

28 August 2015

Every year, thousands of seabirds cast ashore and are found dead along the coasts of North America and Western Europe. These massive mortality events called ‘winter wrecks’ have generally been attributed to harsh climatic conditions and prolonged storms which affect bird energy balance and impact (...)

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[hal-01084405] Ocean acidification reshapes the otolith-body allometry of growth in juvenile seabream

20 November 2014

The effects of elevated CO2 partial pressure (pCO2) on otolith calcification and on the coupling between the somatic and otolith growth were investigated in juvenile gilthead seabream Sparus aurata. Six-month old individuals were raised during seven weeks under four pCO2 conditions set (...)

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[hal-01070265] Comparative bioaccumulation kinetics of trace elements in Mediterranean marine sponges

8 October 2014

While marine organisms such as bivalves, seagrasses and macroalgae are commonly used as biomonitors for the environment pollution assessment, widely distributed sponges received little attention as potential helpful species for monitoring programmes. In this study, the trace element and (...)

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[hal-00855750] Ocean acidification and temperature rise: effects on calcification during early development of the cuttlefish Sepia officinalis

30 August 2013

This study investigated the effects of seawater pH (i.e. 8.10, 7.85 and 7.60) and temperature (16 and 19°C) on (i) the abiotic conditions in the fluid surrounding the embryo (viz. the perivitelline fluid), (ii) growth, development and (iii) cuttlebone calcification of embryonic and juvenile (...)

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[hal-00785214] Effects of ocean acidification on trace element accumulation in the early-life stages of squid Loligo vulgaris

6 February 2013

The anthropogenic release of carbon dioxide (CO2) into the atmosphere leads to an increase in the CO2 partial pressure (pCO2) in the ocean, which may reach 950 µatm by the end of the 21st century. The resulting hypercapnia (high pCO2) and decreasing pH ("ocean acidification") are (...)

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[hal-00659887] Temperature and pCO2 effect on the bioaccumulation of radionuclides and trace elements in the eggs of the common cuttlefish, Sepia officinalis

16 January 2012

The increasing release of CO2 by human activities leads to ocean acidification and global warming. Both those consequences (i.e., increase in seawater pCO2 and temperature) may drastically affect physiology of marine organisms. The effects of low pH and elevated temperature on the (...)

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[hal-00645126] Radioisotopes demonstrate the contrasting bioaccumulation capacities of heavy metals in embryonic stages of cephalopod species

29 November 2011

Cephalopods play a key role in many marine trophic food webs and also constitute alternative fishery resources in the context of the ongoing decline in finfish stocks. Most coastal cephalopod species of commercial importance migrate into shallow waters during the breeding season to lay their (...)

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[hal-00511997] Influence of food on the assimilation of selected metals in tropical bivalves from the New Caledonia lagoon: qualitative and quantitative aspects

2 December 2010

The present study aimed at examining the influence of food quality and quantity on the assimilation efficiency (AE) of metals in two abundant bivalves in the New Caledonia lagoon, the oyster Isognomon isognomon and the clam Gafrarium tumidum. Bivalves were exposed via their food to the (...)

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[hal-00524886] Metal and metalloid bioaccumulation in the Pacific blue shrimp Litopenaeus stylirostris (Stimpson) from New Caledonia: laboratory and field studies

2 December 2010

The present work aimed at better understanding metal and metalloid bioaccumulation in the edible Pacific blue shrimp Litopenaeus stylirostris, using both laboratory and field approaches. In the laboratory, the bioaccumulation kinetics of Ag, Cd, Co, Cr, and Zn have been investigated in shrimp (...)

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[hal-00525456] Variation of acid phosphatases and cathepsins activities in the cuttlefish (Sepia officinalis) eggs: specific activity and effects of Ag, Cd, Cu exposures

12 October 2010

This paper describes the changes of the acid phosphatases (AcP) and cathepsin activities throughout the cuttlefish embryo development. The enzyme activity kinetics appeared to be linked with the respective developmental stage. Activities of both enzymes increased during the last days of (...)

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[hal-00474436] Effects of increased pCO2 and temperature on trace element (Ag, Cd and Zn) bioaccumulation in the eggs of the common cuttlefish, Sepia officinalis

13 May 2010

Cephalopods play a key role in many marine trophic networks and constitute alternative fisheries resources, especially given the ongoing decline in finfish stocks. Along the European coast, the eggs of the cuttlefish Sepia officinalis are characterized by an increasing permeability of the (...)

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[hal-00415866] Phenoloxidase activation in the embryo of the common cuttlefish Sepia officinalis and responses to the Ag and Cu exposure

1 May 2010

The prophenoloxidase (proPO) system catalysing the melanin production is considered as implicated in the innate immune system in invertebrates. The phenoloxidase (PO)-like activity was detected in the cuttlefish embryo sampled at the end of the organogenesis and few hours before hatching. (...)

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[hal-00429895] Biokinetics of Hg and Pb accumulation in the encapsulated egg of the common cuttlefish Sepia officinalis: radiotracer experiments

1 May 2010

Uptake and depuration kinetics of dissolved 203Hg and 210Pb were determined during the entire embryonic development of the eggs of the cuttlefish, Sepia officinalis (50 d at 17°C). 203Hg and 210Pb were accumulated continuously by the eggs all along the development time reaching (...)

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[hal-00445618] Contrasting accumulation biokinetics and distribution of 241Am, Co, Cs, Mn and Zn during the whole development time of the eggs of the common cuttlefish, Sepia officinalis

10 January 2010

Cuttlefish eggs were exposed to 241Am, Co, Cs, Mn and Zn for different periods of time during the 50-d of the embryonic development at 17°C. Exposures were carried out using background dissolved concentrations of the metals, using the corresponding -emitting radiotracers (241Am, 57Co, 134Cs, (...)

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[hal-00415807] Bioaccumulation of inorganic Hg by the juvenile cuttlefish Sepia officinalis exposed to 203Hg radiolabelled seawater and food

11 September 2009

Uptake and depuration kinetics of inorganic mercury (Hg) was investigated in the juvenile common cuttlefish Sepia officinalis following exposures via seawater and food using sensitive radiotracer technique (203Hg). The cuttlefish readily concentrated 203Hg when exposed via seawater, with whole (...)

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[tel-00339245] Incorporation des métaux dans les œufs de la seiche commune Sepia officinalis et effets potentiels sur les fonctions digestives et immunitaires

17 November 2008

Au printemps, la seiche commune Sepia officinalis effectue des migrations du large vers la côte pour se reproduire et mourir. La ponte a lieu en zone côtière, sujette à la contamination métallique d'origine anthropique, ce qui pose la question de la toxicité des éléments traces sur le développement (...)

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[hal-00288870] First experiments on the maternal transfer of metals in the cuttlefish Sepia officinalis

22 June 2008

The aim of this study was to provide a first insight on the incorporation of 8 metals in the eggs of the cuttlefish Sepia officinalis via maternal transfer, using radiotracer techniques (110mAg, 241Am, 109Cd, 60Co, 134Cs, 54Mn, 75Se and 65Zn). The cuttlefish was fed daily with radiolabelled (...)

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[hal-00252076] Differential bioaccumulation behaviour of Ag and Cd during the early development of the cuttlefish Sepia officinalis

12 February 2008

Cuttlefish eggs were exposed to background concentrations of dissolved Ag and Cd, using the radiotracers 110mAg and 109Cd. At different time of the embryonic development (50 days), some eggs were placed in non contaminating conditions. During the experiment, the uptake and depuration kinetics, (...)

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