Toothed whales in the northwestern Mediterranean: Insight into their feeding ecology using chemical tracers

MARINE POLLUTION BULLETIN

卷:62

Article

Praca, Emilie^1,2  Laran, Sophie^2,3  Lepoint, Gilles¹  Thome, Jean-Pierre⁴  Quetglas, Antoni⁵  Belcari, Paola^7,8  Sartor, Paolo^6,9  Dhermain, Frank^3,10  Ody, Denis^3,11  Tapie, Nathalie¹²  Budzinski, Helene¹²  Das, Krishna¹ 

[1] Univ Liege, Lab Oceanol, MARE Ctr, B-4000 Liege, Belgium

[2] Ctr Rech Cetaces Marineland, F-06600 Antibes, France

[3] Groupement Interet Sci Mammiferes Marins Mediterr, F-83418 Hyeres, France

[4] Univ Liege, Lab Ecol Anim & Ecotoxicol, B-4000 Liege, Belgium

[5] Ctr Oceanog Balears, Inst Espanol Oceanog, Palma de Mallorca 07080, Spain

[6] Univ Pisa, Dipartimento Sci Uomo & Ambiente, I-56100 Pisa, Italy

[7] UCL, Dept Phys & Astron, London WC1E 6BT, England

[8] UCL, London Ctr Nanotechnol, London WC1E 6BT, England

[9] Consorzio Ctr Interuniv Biol Marina & Ecol Applic, I-57128 Livorno, Italy

[10] Grp Etud Cetaces Mediterranee, F-13009 Marseille, France

[11] WWF France, F-13001 Marseille, France

[12] Univ Bordeaux 1, CNRS, Lab Phys & Toxico Chem Environm LPTC, Inst Mol Sci ISM,UMR 5255, F-33405 Talence, France

关键词: Chemical tracers;    Stable isotopes;    Organochlorines;    Sperm whale;    Pilot whale;    Risso's dolphin;    Mediterranean Sea;   

DOI  :  10.1016/j.marpolbul.2011.02.024

来源: Elsevier

【 摘 要 】

Risso's dolphins, pilot whales and sperm whales rarely strand in the northwestern Mediterranean. Thus, their feeding ecology, through the analysis of stomach contents, is poorly known. The aim of this study was to gain further insight into the segregation/superposition of the diet and habitat of Risso's dolphins, pilot whales and sperm whales using chemical tracers, namely, stable isotopes (delta C-13, delta N-15) and organochlorines. Significantly different delta N-15 values were obtained in Risso's dolphins (11.7 +/- 0.7%), sperm whales (10.8 +/- 0.3%) and pilot whales (9.8 +/- 0.3%), revealing different trophic levels. These differences are presumably due to various proportions of Histioteuthidae cephalopods in each toothed whale's diet. Similar delta C-13 contents between species indicated long-term habitat superposition or corroborated important seasonal migrations. Lower congener 180 concentrations (8.20 vs. 21.73 mu g.g(-1) lw) and higher tDDT/tPCB ratios (0.93 vs. 0.42) were observed in sperm whales compared with Risso's dolphins and may indicate wider migrations for the former. Therefore, competition between these species seems to depend on different trophic levels and migration patterns. (C) 2011 Elsevier Ltd. All rights reserved.

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