FN Archimer Export Format
PT J
TI Investigating isotopic functional indices to reveal changes in the structure and functioning of benthic communities
BT 
AF RIGOLET, Carinne
   THIEBAUT, Eric
   BRIND'AMOUR, Anik
   DUBOIS, Stanislas
AS 1:1,2;2:2,3;3:4;4:1;
FF 1:;2:;3:PDG-RBE-EMH;4:PDG-ODE-DYNECO-BENTHOS;
C1 IFREMER, DYNECO, Lab Ecol Benth, F-29280 Plouzane, France.
   Univ Paris 04, Univ Paris 06, UMR 7144, Stn Biol Roscoff, F-29688 Roscoff, France.
   CNRS, UMR 7144, Adaptat & Divers Milieu Marin, F-29680 Roscoff, France.
   IFREMER, DRBE, Lab Ecol & Modeles Halieut, F-44311 Nantes 03, France.
C2 IFREMER, FRANCE
   UNIV PARIS 04, FRANCE
   CNRS, FRANCE
   IFREMER, FRANCE
SI NANTES
   BREST
SE PDG-RBE-EMH
   PDG-ODE-DYNECO-BENTHOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 5.21
TC 45
UR https://archimer.ifremer.fr/doc/00260/37144/88204.pdf
LA English
DT Article
DE ;community-wide metrics;functional diversity;habitats;stable isotopes;trophic niche width
AB 1. With the use of stable isotopes, new concepts have emerged based on the idea that the ecological niche can be approximated by the isotopic niche defined as a δ-space area with isotopic δ values as coordinates. This study aims to (i) redefine functional indices originally based on quantitative biological traits of species and demonstrate the ecological significance of newly defined isotopic functional indices (IFI) in a δ-isotopic space, (ii) compare IFI using biomass data with existing unweighted isotopic indices using only isotopic compositions.  2. Using a community-wide approach, we tested IFI using isotopic compositions of a large set of associated species from two marine benthic communities widely reported in coastal shallow waters: the common Amphiura filiformis muddy-sand community and the engineered Haploops nirae sandy-mud community. Biomass and isotopic composition (13C and 15N) of all species were measured during four seasons.  3. IFI were calculated in the isotopic space defined by the two communities, and variations were analysed: (i) isotopic functional richness indices measure the overall extent of the community trophic niche. They are higher in the Haploops community due to a higher diversity in food sources but also to longer food chains. (ii) isotopic functional evenness indices quantify the regularity in species distribution and the density in species packing. They showed that the biomass is concentrated at the edges of the food web in the Haploops community, outside the isotopic range of the main food source. (iii) isotopic functional divergence indices quantify the degree to which species distribution maximizes the divergence. They showed a larger utilization of secondary food sources in the Haploops community.  4. The IFI variations responded according to expectations overall, based on the extensive knowledge of those communities. Results highlighted that IFI weighted with species biomass provide new insights into how the structure of energy accumulation as biomass between species is likely to underpin community structure and the interplay between structural components of richness, diversity and evenness of biomass distribution.
PY 2015
PD OCT
SO Functional Ecology
SN 0269-8463
PU Wiley-blackwell
VL 29
IS 10
UT 000362395400013
BP 1350
EP 1360
DI 10.1111/1365-2435.12444
ID 37144
ER

EF