TY - JOUR TI - Body size and stable isotope composition of zooplankton in the western tropical Atlantic AU - Figueiredo, Gabriela Guerra Araújo Abrantes de AU - Schwamborn, Ralf AU - Bertrand, Arnaud AU - Munaron, Jean-Marie AU - Le Loc'h, François T2 - Journal of Marine Systems AB - Size-based approaches are paramount tools for the study of marine food webs. Here, we investigated the relationship between zooplankton body size, stable isotope composition and trophic level (TL) along a large-scale onshore-offshore gradient in the western tropical Atlantic. Samples were obtained on the Brazilian continental shelf, slope and in oceanic waters (off Fernando de Noronha archipelago and Rocas Atoll) in September and October 2015. Zooplankton was sieved into five size fractions. Zooplankton was dominated by copepods, except for the largest (>2000 μm) size fraction, that showed a high biovolume of chaetognaths, decapods, and fish larvae. Maximum zooplankton abundance and biovolume was found at the continental slope. POM showed consistently lower δ13C than zooplankton, indicating a selective use of 13C-rich primary food sources by zooplankton. Particulate organic matter (POM) was more 13C-enriched in shelf areas (average: −22.8, −23.6 and − 24.3‰ at the shelf, slope and oceanic islands, respectively), probably due to the higher abundance of diatoms nearshore. POM had δ15N values between 2.5 and 6.9‰ (average: 4.0, 4.9 and 4.2‰ at the shelf, slope and oceanic islands, respectively). Zooplankton δ15N and TL increased with body size. The δ15N of the 200–500 μm size fraction was used as baseline for TL estimation. Oceanic areas (average baseline δ15N = 5.8‰ ± 0.52, n = 14) showed a higher baseline δ15N than the shelf (average = 3.9‰ ± 0.69, n = 9) and the slope areas (average = 3.1‰ ± 0.93, n = 9). In spite of differing baselines, the δ15N data produced a consistent pattern of log-linear increase in TL with increasing size, in all areas. The choice of input trophic enrichment factor (TEF) values only slightly changed the log10 (body size) vs TL slopes, but this choice had a considerable effect on the estimates of predator/prey size ratio (PPSR) and predator/prey mass ratio (PPMR). Using a TEF above 2.3 leads to unrealistic PPSR and PPMR estimates. Overall average slope was 0.59 ± 0.08 TL μm−1 with TEF = 2.3 and 0.42 ± 0.07 TL μm−1 with TEF = 3.2. DA - 2020/12/01/ PY - 2020 DO - 10.1016/j.jmarsys.2020.103449 DP - ScienceDirect VL - 212 SP - 103449 J2 - Journal of Marine Systems LA - en SN - 0924-7963 UR - http://www.sciencedirect.com/science/article/pii/S0924796320301457 Y2 - 2020/10/26/14:23:31 KW - ACL KW - DISCOVERY KW - H2020 73427 KW - IRD KW - PADDLE_MSCA-2016-RISE_734271 KW - Plankton KW - Predator/prey mass ratio KW - SUD KW - Size classes KW - Trophic level KW - carbon KW - delta C-13 KW - delta N-15 KW - fatty-acid KW - fractionated zooplankton KW - mesozooplankton KW - nitrogen isotope KW - north pacific KW - particulate organic-matter KW - patterns KW - pelagic food-web KW - shelf-slope KW - δC KW - δN ER -