Estuarine resources use by juvenile Flagfin mojarra (Eucinostomus melanopterus) in an inverse tropical estuary (Sine Saloum, Senegal)

Gning, Ndombour; Loc’h, François Le; Thiaw, Omar Thiom; Aliaume, Catherine; Vidy, Guy

doi:10.1016/j.ecss.2009.11.037

Cited by 24 publications

(25 citation statements)

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“…curema . The isotopic differences between the estuarine locations and saline or hypersaline locations may be a result of the lower diversity of primary producers observed in the upper Saloum, as suggested by Gning et al (). Furthermore, hypersaline conditions may be stressful for estuarine species such as M .…”

Section: Number Of Mugil Cephalus and Mugil Curema Analysed For Stablmentioning

confidence: 99%

Spatio‐temporal isotopic signatures (δ¹³C and δ¹⁵N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Loc’h

Durand

Diop³

et al. 2015

Journal of Fish Biology

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Potential trophic competition between two sympatric mullet species, Mugil cephalus and Mugil curema, was explored in the hypersaline estuary of the Saloum Delta (Senegal) using δ13C and δ15N composition of muscle tissues. Between species, δ15N compositions were similar, suggesting a similar trophic level, while the difference in δ13C compositions indicated that these species did not feed from exactly the same basal production sources or at least not in the same proportions. This result provides the first evidence of isotopic niche segregation between two limno‐benthophageous species belonging to the geographically widespread, and often locally abundant, Mugilidae family.

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Section: Number Of Mugil Cephalus and Mugil Curema Analysed For Stablmentioning

confidence: 99%

Spatio‐temporal isotopic signatures (δ¹³C and δ¹⁵N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Loc’h

Durand

Diop³

et al. 2015

Journal of Fish Biology

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“…Studies in tropical estuaries (Teixeira & Helmer, 1997;Ramos et al, 2014), mangroves (Kerschner et al, 1985), mudflats (Pessanha & Araújo, 2014) and tropical bays (Pessanha & Araújo, 2012) have found high volumes of zooplankton prey in the stomach of juveniles of mojarra. Other authors have also reported an increasing contribution of infauna to the diet with increasing size of mojarra species due to nutritional requirements change during ontogeny in nursery areas (Carr & Adams, 1973;Bouchereau & Chantrel, 2009;Gning et al, 2010;Denadai et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Salinity has been identified as an important influence on choice of nursery areas in other estuarine fish species (Gning et al, 2010). These choices often depend on additional factors such as availability of foraging or other necessary resources in a particular area, or avoidance of physiological stress and enemies (Planqué et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…mangroves, seagrass or macroalgal beds) to open habitats in adjacent coastal areas or deeper sites (> 1.5 m). These shifts in habitats by Gerreidae have been examined in estuaries (Barletta & Blaber, 2007;Gning et al, 2010;Ramos et al, 2014), coastal lagoons (Arenas-Granados & Acero P., 1992; Branco et al, 1997) and tropical and subtropical bays (Chaves & Robert, 2001;Pessanha & Araújo, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Feeding ecology of three juvenile mojarras (Gerreidae) in a tropical estuary of northeastern Brazil

2016

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Distributions and feeding ecology of mojarra species from shallow water of a tropical estuary in Northeastern Brazil were observed aiming to investigate differences in distribution and resource partitioning among juveniles of three species of mojarras. Fishes were collected with a beach seine across four sites along a salinity gradient from January to December of 2011. Highest abundances were recorded during the rainy season in the upper and middle estuary. Microcrustaceans, mainly copepods, were the preferential prey items of all mojarras, irrespective of size or hydrological season, suggesting these areas may be important nursery habitats. Juveniles of mojarra used two important mechanisms for exploitation of resources: (1) spatial segregation along the salinity and temperature gradient, such as abundance of Eucinostomus melanopterus increased from downstream to upstream estuary, while Eugerres brasilianus displayed an opposite pattern; (2) differences related to the volumetric proportion of the main prey items, with indications that E. melanopterus and Diapterus rhombeus fed predominantly on Calanoida and Cyclopoida, while the diet of E. brasilianus was dominated by items of infauna. Such strategies were important for resource partitioning, favouring the coexistence of these three species in the estuary.A distribuição e a ecologia alimentar de gerreídeos capturados em águas rasas de um estuário tropical no nordeste do Brasil foram abordados com o objetivo de investigar diferenças na distribuição e partição de recursos entre três espécies de gerreídeos juvenis. Arrastos de praia foram realizados ao longo de quatro locais ao longo do gradiente de salinidade entre janeiro e dezembro de 2011. Maiores abundâncias foram registradas durante a estação chuvosa na zona superior e média do estuário. Microcrustáceos, principalmente copépodos, foram as principais presas para as três espécies, independente do tamanho ou do período hidrológico, sugerindo que essas áreas são importantes para o recrutamento. Gerreídeos juvenis usaram dois importantes mecanismos para exploração dos recursos: (1) segregação espacial no uso dos habitats ao longo do gradiente de salinidade e temperatura, com a abundância de Eucinostomus melanopterus aumentando em direção a parte inferior para porção superior do estuário, enquanto Eugerres brasilianus apresentou um padrão oposto; e (2) diferenças relacionadas com a proporção volumétrica das principais presas ingeridas, com indicações que E. melanopterus e Diapterus rhombeus alimentaram-se principalmente de Calanoida e Cyclpoida, enquanto a dieta de E. brasilianus foi dominada por itens da infauna. Tais estratégias foram importantes para partição dos recursos, favorecendo a coexistência dessas três espécies no estuário.

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“…Stable isotopes have more recently emerged as a promising complementary methodology to address fish dietary ecology (e.g., Carassou et al, 2008;Gning et al, 2010;França et al, 2011;Davis et al, 2012;Carassou et al, 2016). Stable isotopes can be used as natural tracers of the sources of food assimilated by a consumer, relying on the principle that the isotopic composition of the food is reflected in the consumer tissues after some period of time ranging from weeks to months depending on species, environmental conditions and 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 Author-produced version of the article published in Regional Studies in Marine Science, 2017, 16, 145-151 The original publication is available at http://www.sciencedirect.…”

Section: Introductionmentioning

confidence: 99%

Preliminary assessment of the trophic structure of demersal fish community in the Sea of Oman

Carassou

Al-Kindi

Dobrestsov

2017

Regional Studies in Marine Science

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Detailed knowledge on the trophic ecology of marine species is an essential asset for the development of appropriate ecosystem-based management of marine fisheries. In the Sea of Oman, no studies to date have addressed the diet of demersal fish inhabiting soft-bottom habitats, despite the importance of these habitats for local fisheries. This study provides a preliminary investigation of feeding strategies displayed by demersal fish communities at two seasons in the Sea of Oman, Muscat waters, based on stomach content and dorsal muscle δ 15 N, δ 13 C and δ 34 S analyses. A total of 46 fishes from 15 species, 14 families and 7 orders were collected in December 2013 and March 2014. All species displayed a carnivorous diet, with variable contributions of invertebrate and fish prey. While stomach content data suggested that Fistularia petimba (Fistulariidae), Saurida tumbil (Synodontidae) and Ulua mentalis (Carangidae) were mostly piscivorous, their δ 15 N values strongly overlapped with other species found to feed mostly on invertebrates, suggesting a mixed fish-invertebrate feeding on a longer time scale. No significant variations were found between months in terms of mean isotopic values, but larger range values and variances were observed for δ 13 C and δ 34 S in December, possibly indicating the consumption of food resources from more diverse mixture and origin during that month. Only δ 15 N was weakly but significantly related to fish size at the community level, suggesting a poor size-related structuration of the demersal fish community at the spatial and temporal scale examined, consistent with other studies in the study area. However, the low number of samples analyzed limited the scope of our conclusions, and further investigations based on stable isotope methodology are needed to obtain essential biological knowledge for ecosystem-based management of fisheries in the Sea of Oman.

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Estuarine resources use by juvenile Flagfin mojarra (Eucinostomus melanopterus) in an inverse tropical estuary (Sine Saloum, Senegal)

Cited by 24 publications

References 32 publications

Spatio‐temporal isotopic signatures (δ¹³C and δ¹⁵N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Spatio‐temporal isotopic signatures (δ¹³C and δ¹⁵N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Feeding ecology of three juvenile mojarras (Gerreidae) in a tropical estuary of northeastern Brazil

Preliminary assessment of the trophic structure of demersal fish community in the Sea of Oman

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Estuarine resources use by juvenile Flagfin mojarra (Eucinostomus melanopterus) in an inverse tropical estuary (Sine Saloum, Senegal)

Cited by 24 publications

References 32 publications

Spatio‐temporal isotopic signatures (δ13C and δ15N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Spatio‐temporal isotopic signatures (δ13C and δ15N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Feeding ecology of three juvenile mojarras (Gerreidae) in a tropical estuary of northeastern Brazil

Preliminary assessment of the trophic structure of demersal fish community in the Sea of Oman

Contact Info

Product

Resources

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Spatio‐temporal isotopic signatures (δ¹³C and δ¹⁵N) reveal that two sympatric West African mullet species do not feed on the same basal production sources

Spatio‐temporal isotopic signatures (δ¹³C and δ¹⁵N) reveal that two sympatric West African mullet species do not feed on the same basal production sources