FN Archimer Export Format
PT J
TI Body size and stable isotope composition of zooplankton in the western tropical Atlantic
BT 
AF Guerra Araújo Abrantes de Figueiredo, Gabriela
   Schwamborn, Ralf
   Bertrand, Arnaud
   Munaron, Jean-Marie
   LE LOCH, Francois
AS 1:1;2:1;3:2,3;4:4;5:4;
FF 1:;2:;3:;4:;5:;
C1 Department of Oceanography, Federal University of Pernambuco, Recife, Brazil
   Programa de pós-graduação em Ecologia, Universidade Federal Rural de Pernambuco, Recife, Brazil
   Institut de Recherche pour le Développement (IRD), MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sète, France
   Institut de Recherche pour le Développement, Univ Brest, CNRS, IRD, Ifremer, LEMAR, IUEM, F-29280 Plouzané, France
C2 UNIV FED PERNAMBUCO UFPE, BRAZIL
   UNIV FED RURAL PERNAMBUCO UFRPE, BRAZIL
   IRD, FRANCE
   IRD, FRANCE
UM LEMAR
   MARBEC
IN WOS Cotutelle UMR
   copubli-france
   copubli-int-hors-europe
   copubli-sud
IF 2.542
TC 19
UR https://archimer.ifremer.fr/doc/00652/76389/77403.pdf
LA English
DT Article
CR ABRACOS
BO Antea
DE ;Plankton;delta C-13;delta N-15;Size classes;Trophic level;Predator/prey mass ratio
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. 
PY 2020
PD DEC
SO Journal Of Marine Systems
SN 0924-7963
PU Elsevier BV
VL 212
UT 000582806700018
DI 10.1016/j.jmarsys.2020.103449
ID 76389
ER

EF