Spatial and temporal structure of fish assemblages in an “inverse estuary”, the Sine Saloum system (Senegal)

Simier, Monique; Blanc, Laurence; Aliaume, Catherine; Diouf, Papa Samba; Albaret, Jean-Jacques

doi:10.1016/j.ecss.2003.08.002

Cited by 113 publications

(107 citation statements)

References 31 publications

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“…Although it is well known that underground rivers exist in the Yucatan Peninsula, their contribution to this ecosystem is very low; hence salinity had the greatest influence on species composition, as has been reported for other coastal lagoons by Paperno & Brodie (2004), Simier et al (2004), Vega-Cendejas & Hernández (2004), and Whitfield al. (2006).…”

Section: Discussionmentioning

confidence: 78%

“…This may be due to the zone sampled, fishing gear used, time of catch or the effort employed; however, much of the composition of fish in lagoon systems is due to the presence of occasional marine species that are only collected once during an entire sampling period (G. micrura, H. erectus, C. latus, S. vomer, C. arenarius, M. furnieri, among others), hence the size of the marine-lagoon connection and the time it is open for is a very important factor, since this allows lagoon-ocean communication (James et al, 2007;Mendoza et al, 2009). Simier et al (2004) suggested that the high diversity recorded in lagoon systems may be due to: a) the establishment of marine species because of the permanent communication with the ocean and the presence of freshwater effluents; and b) the heterogeneity of habitats (seagrass beds, mangrove roots, muddy bottoms, and freshwater blooms) that favour the colonization of different species. However in Ría Lagartos Lagoon system the low richness is is due to high salinity throughout the year and throughout the lagoon system.…”

Section: Discussionmentioning

confidence: 99%

“…The hyperhaline systems are complex and dynamic ecosystems (Simier et al, 2004). Their physical, chemical and biological properties present a strong gradient with variabilities that range from short periods of time to seasonal (Nogueira et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal structure of fish assemblages in a hyperhaline coastal system: Ría Lagartos, Mexico

Peralta-Meixueiro¹,

Vega‐Cendejas²

2011

Neotrop. ichthyol.

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The spatial and temporal fish species assemblages were analyzed throughout two annual cycles (2004-2005 and 2007-2008) in the Ría Lagartos Lagoon system, Mexico, via non-parametric multivariate analyses. We compared density and biomass of fish species among five habitat types defined by combinations of structure and environmental characteristics (hyperhaline, rocky, seagrass, channel, and marine), and three climatic seasons (dry, rainy, and northerlies). A total of 11,187 individuals distributed in 32 families and 63 species were collected. The most numerically abundant species were Floridichthys polyommus and Cyprinodon artifrons, while Sphoeroides testudineus contributed to the greatest biomass. Species composition consisted mainly of estuarine and euryhaline marine species. Spatially, a saline gradient was observed with marine conditions in the mouth, and increasing to over 100 in the inner zone of the system. Species richness, diversity and biomass declined from the mouth to the inner zone, while density showed an inverse tendency, with the highest values in the inner zone. Thus the salinity was the variable that best explained the spatial fish assemblages' structure. The ichthyofauna composition did not change over time, but the dominant species varied with the years. The abundance of juvenile specimens, suggest that the different habitats are used as feeding and breeding zones; hence it is proposed that protection strategies be pursued not only for the lagoon system but also for the northern zone of the Yucatan Peninsula. Los ensamblajes espacio temporales de peces fueron analizados a través de dos ciclos anuales (2004-2005) y 2007-2008) en el sistema lagunar Ría Lagartos, México, vía análisis multivariados no paramétricos. Se comparó la densidad y biomasa de peces entre los cinco tipos de hábitats definidos por la combinación de características estructurales y ambientales (hiperhalino, rocoso, pastos, canal y marino) y tres temporadas climáticas (secas, lluvias y nortes). Un total de 11.187 individuos fueron recolectados, distribuidos en 32 familias y 63 especies. Las especies numéricamente más abundantes fueron Floridichthys poliommus y Cyprinodon artifrons, mientras que Sphoeroides testudineus contribuyó principalmente con la biomasa. La composición de especies consistió principalmente de especies marinas eurihalinas y estuarinas. Espacialmente, un gradiente de salinidad fue observado con condiciones marinas en la boca del sistema lagunar, incrementándose hacia la zona interna con valores superiores a 100. La riqueza de especies, diversidad y biomasa disminuyó desde la boca hacia la zona interna, mientras que la densidad mostró una tendencia inversa, con valores más altos en la zona interna. La salinidad fue la variable que mejor explicó la estructura espacial de los ensamblajes de peces. La composición de la ictiofauna no cambió en el tiempo, pero las especies dominantes varían con los años. La abundancia de especímenes juveniles sugiere que los diferentes hábitats son usados como zonas de alimentació...

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

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Spatial and temporal structure of fish assemblages in a hyperhaline coastal system: Ría Lagartos, Mexico

Peralta-Meixueiro¹,

Vega‐Cendejas²

2011

Neotrop. ichthyol.

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“…Despite the absence of prominent hydrological regime shift, turnover is important in relation to fish species bioecology and environmental conditions (Simier, Blanc, Aliaume, Diouf, & Albaret, 2004). In response to the natural intense turnover and the transience of trophic relationships, functional categorization of fish assemblages in these estuarine systems is mitigated.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Recovering Effects of Protected Areas Using a Multiple Functional Approaches: The Bamboung Model (Senegal, West Africa)

Faye¹

2015

IJB

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The Bamboung protected area (Senegal, West Africa) has been implemented in 2003. However, little is known about its recovering effects on fish assemblage functional diversity. To address this issue, a morphology-based functional grouping was adopted, and results were compared to prior classifications. Functional richness relative to each guild and species abundance was used to define a functional redundancy index. Morphometric measurements were done in the field on freshly killed specimens and completed by digital image processing using the Image-J software in laboratory. Data relative to biomass and abundance were obtained from the IRD (Research Institute for Development) / Adaptive Response of Fish Assemblages to the Environmental Pressure (RAP) Unit-Research database. Hierarchical clustering, analysis using the ward method, was applied to the matrix of morphological traits to discriminate fish assemblages into four functional guilds: zoobenthos feeders, algivorous / detritivorous fish, benthopelagic fish, and demersal and ichthyophagous fish. The new functional grouping reduced fish assemblage complexity to smaller and more significant units than those obtained from previous gut-content based-classification, and the modifications affecting fish biomass distribution after fishing ban, marked by large predatory fishes domination appeared more perceptible. Classification based on fish life-history traits showed similar results with a domination of fish assemblages by marine species of larger size and upper trophic level. However, this latter approach is still relevant as it provides significant information on fish species mobility and community dynamics. Major observed changes occurred after one to three years of protection. The total fish biomass varied from 6458 kg.km -2 in 2003 to 3114 kg.km -2 in 2007. We hypothesized that collapse in total fish biomass may be explained by predation pressure in the system. Species richness varied from 51 in 2003 to 72 in 2007, while the functional redundancy index showed a decreasing trend indicating a functional diversification in the system subsequent to the reserve establishment. The present study highlights the relevance of multiple approaches model in addressing dynamics of complex systems. However, the present trend does not presage the future evolution in the system, many reserves take over a decade to get a stable state.

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“…Few species of teleosts have been reported to occur in strongly hypersaline waters (> 70; Simier et al 2004;Whitfield et al 2006), and even fewer species are known to reproduce successfully in these conditions. Among these are several killifishes [the California killifish In the Sine Saloum Estuary (Senegal), which regularly experiences episodes of severe drought, water salinity rises with increasing distance to the sea as a result of strong evaporation, and salinities over 130 can be observed in some places located up to 100 km from the sea.…”

Section: Introductionmentioning

confidence: 99%

Egg production in the euryhaline tilapia,Sarotherodon melanotheron heudelotii, experimentally maintained in fresh, sea and hypersaline waters

Dugué¹,

Baras

Gueye³

et al. 2014

Aquat. Living Resour.

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-Through the experiments presented here we wanted to test whether egg production of the black-chinned tilapia Sarotherodon melanotheron heudelotii under experimental conditions varies as a function of ambient salinity (fresh waters vs. sea waters vs. hypersaline waters, 0, 35 and 70, respectively) and whether these responses differ between fish acclimated within a few weeks from fresh water to saline and hypersaline environments (experiments E1 and E2, monitoring over 10 and 18 weeks), and individuals born and raised all life long at the experimental salinities (E3, monitoring over 18 weeks). In total, 233 spawns were collected. In each of the three experiments, the reproductive investment (gram of egg per gram of female over 2 weeks) did not differ between salinities of 0 and 35, whereas it was 2-3 times lower at 70 than at 0-35, because of lower spawning frequency (E1-E3), smaller clutch size (E1) and lower spawn mass (E1-E3). Finally, fish acclimated to salinity from fresh water over a few weeks and those maintained at a particular salinity all life long showed similar reproductive traits, thereby emphasizing the remarkable physiological plasticity of this species.

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Spatial and temporal structure of fish assemblages in an “inverse estuary”, the Sine Saloum system (Senegal)

Cited by 113 publications

References 31 publications

Spatial and temporal structure of fish assemblages in a hyperhaline coastal system: Ría Lagartos, Mexico

Spatial and temporal structure of fish assemblages in a hyperhaline coastal system: Ría Lagartos, Mexico

Assessment of the Recovering Effects of Protected Areas Using a Multiple Functional Approaches: The Bamboung Model (Senegal, West Africa)

Egg production in the euryhaline tilapia,Sarotherodon melanotheron heudelotii, experimentally maintained in fresh, sea and hypersaline waters

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