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. 2018 Feb;2(2):299-305.
doi: 10.1038/s41559-017-0432-z. Epub 2018 Jan 18.

A global perspective on the trophic geography of sharks

Christopher S Bird  1   2 Ana Veríssimo  3   4 Sarah Magozzi  5 Kátya G Abrantes  6 Alex Aguilar  7 Hassan Al-Reasi  8 Adam Barnett  6 Dana M Bethea  9   10 Gérard Biais  11 Asuncion Borrell  7 Marc Bouchoucha  12 Mariah Boyle  13 Edward J Brooks  14 Juerg Brunnschweiler  15 Paco Bustamante  16 Aaron Carlisle  17 Diana Catarino  18 Stéphane Caut  19 Yves Cherel  20 Tiphaine Chouvelon  21 Diana Churchill  22 Javier Ciancio  23 Julien Claes  24 Ana Colaço  18 Dean L Courtney  25   26 Pierre Cresson  27 Ryan Daly  28   29 Leigh de Necker  30 Tetsuya Endo  31 Ivone Figueiredo  32 Ashley J Frisch  33 Joan Holst Hansen  34 Michael Heithaus  35 Nigel E Hussey  36 Johannes Iitembu  37 Francis Juanes  38 Michael J Kinney  39 Jeremy J Kiszka  40 Sebastian A Klarian  41 Dorothée Kopp  42 Robert Leaf  43 Yunkai Li  44 Anne Lorrain  45 Daniel J Madigan  46 Aleksandra Maljković  47 Luis Malpica-Cruz  48 Philip Matich  49   50 Mark G Meekan  51 Frédéric Ménard  52 Gui M Menezes  18 Samantha E M Munroe  53 Michael C Newman  54 Yannis P Papastamatiou  55   56 Heidi Pethybridge  57 Jeffrey D Plumlee  58   59 Carlos Polo-Silva  60 Katie Quaeck-Davies  5 Vincent Raoult  61 Jonathan Reum  62 Yassir Eden Torres-Rojas  63 David S Shiffman  64 Oliver N Shipley  65 Conrad W Speed  51 Michelle D Staudinger  66   67 Amy K Teffer  38 Alexander Tilley  68 Maria Valls  69 Jeremy J Vaudo  70 Tak-Cheung Wai  71 R J David Wells  58   59 Alex S J Wyatt  72 Andrew Yool  73 Clive N Trueman  74
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Free article

A global perspective on the trophic geography of sharks

Christopher S Bird et al. Nat Ecol Evol. 2018 Feb.
Free article

Abstract

Sharks are a diverse group of mobile predators that forage across varied spatial scales and have the potential to influence food web dynamics. The ecological consequences of recent declines in shark biomass may extend across broader geographic ranges if shark taxa display common behavioural traits. By tracking the original site of photosynthetic fixation of carbon atoms that were ultimately assimilated into muscle tissues of 5,394 sharks from 114 species, we identify globally consistent biogeographic traits in trophic interactions between sharks found in different habitats. We show that populations of shelf-dwelling sharks derive a substantial proportion of their carbon from regional pelagic sources, but contain individuals that forage within additional isotopically diverse local food webs, such as those supported by terrestrial plant sources, benthic production and macrophytes. In contrast, oceanic sharks seem to use carbon derived from between 30° and 50° of latitude. Global-scale compilations of stable isotope data combined with biogeochemical modelling generate hypotheses regarding animal behaviours that can be tested with other methodological approaches.

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