Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.

Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.

12 pages, 4 figures, 4 tables

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Main Authors: Fanelli, Emanuela, Papiol, Vanesa, Cartes, Joan Enric, Rumolo, P., Brunet, Christophe, Sprovieri, M.
Format: artículo biblioteca
Language:English
Published: Elsevier 2011-01
Subjects:Benthos, Invertebrates, Stable isotopes, Environmental variables, Western Mediterranean,
Online Access:http://hdl.handle.net/10261/32796
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spelling dig-icm-es-10261-327962020-11-26T09:53:55Z Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis. Fanelli, Emanuela Papiol, Vanesa Cartes, Joan Enric Rumolo, P. Brunet, Christophe Sprovieri, M. Benthos Invertebrates Stable isotopes Environmental variables Western Mediterranean 12 pages, 4 figures, 4 tables The food-web structure of the epibenthic and infaunal invertebrates on the continental slope of the Catalan Sea (Balearic basin, NW Mediterranean) was investigated using carbon and nitrogen stable isotopes on a total of 34 species, and HPLC pigment analyses for three key species. Samples were collected close to Barcelona (NE Iberian Peninsula), between 650 and 800 m depth and between February 2007 and February 2008. Mean δ13C values ranged from −21.0‰ (small Calocaris macandreae and Amphipholis squamata) to −14.5‰ (Sipunculus norvegicus). Values of δ15N ranged from 4.0‰ (A. squamata) to 12.1‰ (Molpadia musculus). The stable isotope ratios of benthic fauna displayed a continuum of values (e.g. δ15N range of 8‰), confirming a wide spectrum of feeding strategies (from active suspension feeders to predators) and complex food webs. According to the available information on diets of benthic fauna, the lowest values were found for surface deposit feeders (small C. macandrae and the two ophiuroids A. squamata and Amphiura chiajei) and active suspension feeders (Abra longicallus and Scalpellum scalpellum) feeding on different sizes of particulate organic matter (POM), among which small particles may exhibit lower δ15N. High annual mean δ15N values were found among sub-surface deposit feeders, exploiting refractory or frequently recycled organic matter that is enriched in δ15N. Carnivorous polychaetes (Nephtys spp., Oenonidae and Polynoidae) and large decapods (Geryon longipes and Paromola cuvieri) also displayed high δ15N values. δ13C ranges were particularly wide among surface deposit feeders (ranging from −21.0‰ to −16.4‰), suggesting exploitation of POM of both terrigenous and oceanic origins. Correlation between δ13C and δ15N was generally weak, indicating multiple carbon sources, likely due to the consumption of different kinds of sinking particles (e.g. marine snow, phytodetritus, etc.), sedimented and frequently recycled POM, together with macrophyte remains. The stronger δ13C–δ15N correlations found in February and April suggest that during the period of water column homogeneization (winter–spring), the benthic community was sustained by phytodetritus inputs originating from the peak of surface primary production in February. Conversely, weaker δ13C–δ15N correlations were observed during the period of water column stratification (beginning in June–July), suggesting that the benthic community in this period was sustained, with a delay of ca. 2/3 months, by multiple carbon sources including continental inputs from river discharge (with the maxima in April–May). Thus both advective and vertical fluxes seem to be food sources for benthos on the Catalonian slope. Pigments in the guts of key species were generally degraded, and only the active suspension feeder A. longicallus ingested fresh chlorophyll during periods of high primary production at the surface (February and April 2007) This study was carried out within the framework of the Spanish funded BIOMARE project (ref. CTM2006-13508-CO2-02/MAR: Identification of BIOmarkers of the anthropogenic impact on MARine communities: an Ecosystemic approach). All trawling was performed on board of R/V García del Cid Peer reviewed 2011-02-24T14:05:55Z 2011-02-24T14:05:55Z 2011-01 artículo http://purl.org/coar/resource_type/c_6501 Deep Sea Research - Part I - Oceanographic Research Papers 58(1): 98-109 (2011) 0967-0637 http://hdl.handle.net/10261/32796 10.1016/j.dsr.2010.12.005 en https://doi.org/10.1016/j.dsr.2010.12.005 none Elsevier
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Benthos
Invertebrates
Stable isotopes
Environmental variables
Western Mediterranean
Benthos
Invertebrates
Stable isotopes
Environmental variables
Western Mediterranean
spellingShingle Benthos
Invertebrates
Stable isotopes
Environmental variables
Western Mediterranean
Benthos
Invertebrates
Stable isotopes
Environmental variables
Western Mediterranean
Fanelli, Emanuela
Papiol, Vanesa
Cartes, Joan Enric
Rumolo, P.
Brunet, Christophe
Sprovieri, M.
Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.
description 12 pages, 4 figures, 4 tables
format artículo
topic_facet Benthos
Invertebrates
Stable isotopes
Environmental variables
Western Mediterranean
author Fanelli, Emanuela
Papiol, Vanesa
Cartes, Joan Enric
Rumolo, P.
Brunet, Christophe
Sprovieri, M.
author_facet Fanelli, Emanuela
Papiol, Vanesa
Cartes, Joan Enric
Rumolo, P.
Brunet, Christophe
Sprovieri, M.
author_sort Fanelli, Emanuela
title Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.
title_short Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.
title_full Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.
title_fullStr Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.
title_full_unstemmed Food web structure of the epibenthic and infaunal invertebrates on the Catalan slope (NW Mediterranean): Evidence from δ13C and δ15N analysis.
title_sort food web structure of the epibenthic and infaunal invertebrates on the catalan slope (nw mediterranean): evidence from δ13c and δ15n analysis.
publisher Elsevier
publishDate 2011-01
url http://hdl.handle.net/10261/32796
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