Assessing food web dynamics and relative importance of organic matter sources for fish species in two Portuguese estuaries: A stable isotope approach

França, Susana; Vasconcelos, Rita P.; Tanner, Susanne E.; Máguas, Cristina; Costa, M. J.; Cabral, Henrique N.

doi:10.1016/j.marenvres.2011.09.001

Cited by 54 publications

(33 citation statements)

References 63 publications

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“…Better knowledge of the trophic position and trophic niche of this introduced species when living in sympatry with native species will help in understanding its establishment success. Stable carbon (δ 13 C) and nitrogen (δ 15 N) isotopes are widely used to evaluate the food resources (DeNiro and Epstein, 1978;Fry and Sherr, 1984) and trophic positions (França et al, 2011) of consumers. Because consumers often display δ 15 N values 3-4‰ higher than their food (Minagawa and Wada, 1984) trophic relationships can be studied by stable isotope analysis.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Özdilek¹,

Jones²

2014

Turk. J. Fish. Aquat. Sci.

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Carbon and nitrogen stable isotope analyses were carried out to determine the diet composition and trophic position of the invasive species Carassius gibelio to help understand the potential impact of this species on the native fish fauna in the Karamenderes River, northwest Turkey. Filamentous algae were the most important diet component according to stable isotope mixing models. Filamentous algae and detritus formed also considerable part of the gut contents. The trophic position of C. gibelio was 2.43±0.5, 2.04±0.4 and 3.35±0.5 estimated by three different methods. The trophic niche width of this invasive species was larger than those of the native species. Our results indicate that the high dietary plasticity of C. gibelio and its lower trophic position than the other fish community members, can contribute to its success as an invasive species.

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Section: Introductionmentioning

confidence: 99%

Untitled

Özdilek¹,

Jones²

2014

Turk. J. Fish. Aquat. Sci.

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“…SIAR is based on a Bayesian approach that estimates probability distributions of resource contributions to consumer tissue by accounting for uncertainties associated with the input data (i.e., sources signatures and trophic enrichment factors (TEF)) (Parnell et al, 2010). Inputs are d 13 C and d 15 N for each potential resource and their associated standard errors, TEFs and their standard errors, and consumer isotopic signatures (França et al, 2011). We used a TEF value based on findings from a metaanalysis of trophic fractionation studies (Vanderklift & Ponsard, 2003).…”

Section: Data Analysesmentioning

confidence: 99%

Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

et al. 2015

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This study analyzed variation in stable isotope ratios of aquatic and terrestrial primary producers and two common cyprinid fishes (Capoeta banarescui and Squalius cephalus) at seven sites in the upper Yeşilırmak River Basin, Turkey, to estimate relative contributions of basal production sources to fish biomass. We hypothesized that seasonal and spatial variation in fish assimilation of basal production sources would be affected by hydrological variation, with results for a reach downstream from a reservoir differing from those from upstream sites. Carbon and nitrogen isotopic ratios of primary producers and S. cephalus and d 15 N of C. banarescui revealed significant spatial variation. d 13 C of primary producers, d 15 N of S. cephalus, and both d 13 C and d 15 N of C. banarescui revealed significant seasonal variation. C. banarescui biomass in the river channel was mostly derived from terrestrial herbaceous plants, and its biomass in the reservoir derived mostly from aquatic plants. Estimated proportional contributions of herbaceous plants to both species were greatest at the downstream site during spring, and declined during summer in the case C. banarescui. Overall, the influence of the dam was small relative to effects from watershed characteristics and seasonal changes in temperature and hydrology.

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“…The highest captures of juveniles of migrant fish species such as L. saliens, L. ramada, M. cephalus and S. aurata, and the resident species P. marmoratus, characterised these sites. It has been demonstrated that marshlands provide abundant food resources for the earlier life stages of the migrant fish species (França et al 2011). This situation, combined with lower water depth that offer better protection against predators (França et al 2009), may play an important role in determining the suitability of this habitat to the aforementioned fish species.…”

Section: Sandy Habitatmentioning

confidence: 99%

Fish assemblages in different littoral habitat types of a hypersaline coastal lagoon (Mar Menor, Mediterranean Sea)

Verdiell‐Cubedo

Torralva

Ruiz‐Navarro

et al. 2013

Italian Journal of Zoology

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The fish community that inhabits shallow littoral areas of the Mar Menor coastal lagoon was studied seasonally. Three different habitat types were compared: deep sandy habitats, vegetated habitats and shallow muddy habitats. The results indicated that the dominant fish families in the lagoon were Mugilidae, Gobiidae, Sparidae and Atherinidae. In general, vegetated habitats and shallow muddy habitats showed higher fish abundance, biomass and fish diversity than deep sandy habitats. Moreover, fish community structure differed significantly among habitats. Vegetated habitats and shallow muddy habitats seems to play an important nursery role, mainly for marine migrant species of the Mugilidae and Sparidae families, and constituted essential habitats for species of conservationist interest such Aphanius iberus and Syngnathus abaster. Deep sandy habitats were dominated by the resident goby Pomatoschistus marmoratus. These habitat-related differences are probably related to variations in structural complexity.

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Assessing food web dynamics and relative importance of organic matter sources for fish species in two Portuguese estuaries: A stable isotope approach

Cited by 54 publications

References 63 publications

Untitled

Untitled

Stable isotope analysis reveals relative influences of seasonal hydrologic variation and impoundment on assimilation of primary production sources by fish in the Upper Yesilırmak River, Turkey

Fish assemblages in different littoral habitat types of a hypersaline coastal lagoon (Mar Menor, Mediterranean Sea)

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