Structure and seasonal variability of fish food webs in an estuarine tropical marine protected area (Senegal): Evidence from stable isotope analysis

Faye, Daouda; Morais, Luis Tito de; Raffray, Jean; Sadio, Oumar; Thiaw, Omar Thiom; Loc’h, François Le

doi:10.1016/j.ecss.2011.02.017

Cited by 57 publications

(35 citation statements)

References 74 publications

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“…O. niloticus had a slightly higher trophic position that is considerably due to its higher affinity toward carnivory that was reflected by higher zooplankton FA biomarker, higher ARA/EPA ratio (affinity toward carnivory) and lower x3/x6 (affinity toward herbivory). A similar trophic position was reported for cichlids by Faye et al (2011) and for suspension feeders by Le Loc'h et al (2008).…”

Section: Discussionsupporting

confidence: 74%

Assessing the dietary sources of two cichlid species in River Nile sub-branches: Stomach contents, fatty acids and stable isotopes analyses

El-Karim

Ali

Mahmoud

2016

Egyptian Journal of Aquatic Research

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We assess the importance of four different food sources as dietary components of Oreochromis niloticus and Sarotherodon galilaeus in Nile sub-branches using stomach contents, fatty acids (FA) and stable isotopes (SI) analyses. Diatoms were the dominant food items, whereas sand and mud constitute a major part of the stomach contents of both cichlids in the northern ElBehery canal. FAs and SI were compared in cichlids and four potential food sources. Carbon isotopes excluded the fresh macrophyte Myriophyllum spicatum and its epiphytes as a potential food source, whereas FA biomarkers indicated that M. spicatum is assimilated in cichlids' muscles as detrital materials. FA profiles of cichlids' muscles were highly enriched by live diatom markers whereas decayed diatoms and bacterial markers were partially present. Carbon isotope signatures of cichlids were much close to that of suspended particulate organic matter (SPOM) which elucidated that SPOM was the source of diatoms and bacterial detritus incorporated in cichlids muscles. Cichlids were highly enriched with nitrogen signatures which was a result of increased anthropogenic effects and incorporation of bacterial films. SI and FA analyses precisely indicated that live diatoms and bacteria, detrital macrophytes are the main sources of organic matter incorporated in cichlids muscles. Ó 2016 National Institute of Oceanography and Fisheries. Hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Discussionsupporting

confidence: 74%

Assessing the dietary sources of two cichlid species in River Nile sub-branches: Stomach contents, fatty acids and stable isotopes analyses

El-Karim

Ali

Mahmoud

2016

Egyptian Journal of Aquatic Research

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“…There was strong seasonality in the isotopic values of OM collected from the Thukela River mouth, with 15N significantly enriched and 13C significantly depleted in the dry season, in comparison with the wet season. Seasonality in riverine isotopic values is common on account of the highly dynamic nature of estuaries (Faye et al 2011), including in tropical and subtropical estuaries where wet and dry seasons are well defined (Olin et al 2012). The relatively depleted OM 13C values in both seasons were likely due to the presence of C3 plant detritus from the Thukela River, where C3 plants grow in 75% of the catchment area (Harrison et al 2001).…”

Section: Origin Of Om In the Sediments And Marine Pom Seasonalitymentioning

confidence: 99%

Riverine dominance of a nearshore marine demersal food web: evidence from stable isotope and C/N ratio analysis

Lecea

Smit

Fennessy

2016

African Journal of Marine Science

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“…Kidd et al, 1995;Corbisier et al, 2006;Al-Reasi et al, 2007;Faye et al, 2011). In general, stable isotope ratios of a predator are related to the isotopic composition of their prey.…”

Section: Introductionmentioning

confidence: 99%

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

et al. 2013

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This study applies total mercury (THg) concentration and stable isotope signature (δ15N and δ13C) to evaluate the trophic status and feeding ground of Trichiurus lepturus during its ontogeny in northern Rio de Janeiro, south-eastern Brazil. The trophic position of T. lepturus is detected well by THg and δ15N as the sub-adult planktivorous specimens are distinct from the adult carnivorous specimens. The δ13C signatures suggest a feeding ground associated with marine coastal waters that are shared by fish in different ontogenetic phases. The diet tracers indicated that the fish feeding habits do not vary along seasons of the year, probably reflecting the prey availability in the study area. This fish has economic importance and the concentration of THg was compared to World Health Organization limit, showing that the adult specimens of T. lepturus are very close to the tolerable limit for safe regular ingestion.

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Structure and seasonal variability of fish food webs in an estuarine tropical marine protected area (Senegal): Evidence from stable isotope analysis

Cited by 57 publications

References 74 publications

Assessing the dietary sources of two cichlid species in River Nile sub-branches: Stomach contents, fatty acids and stable isotopes analyses

Assessing the dietary sources of two cichlid species in River Nile sub-branches: Stomach contents, fatty acids and stable isotopes analyses

Riverine dominance of a nearshore marine demersal food web: evidence from stable isotope and C/N ratio analysis

Mercury and stable isotopes (δ15N and δ13C) as tracers during the ontogeny of Trichiurus lepturus

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