Distribution of zooplankton related to environmental factors in three interconnected reservoirs: Kasseb, Mornaguia and Ghdir El Goulla (North of Tunisia)

Sellami, Ikbel; Ayadi, Habib; Bouaïn, Abderrahmen; Aleya, Lotfi; Mhamdi, M. Alaoui

doi:10.1051/limn/2009008

Cited by 5 publications

(6 citation statements)

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“…The high fish density observed in Kasseb Reservoir during late spring (June) is associated with the recruitment of juvenile fish (total length: 1–3 cm) after spawning which occurred in March and early April for pikeperch (M'Hetli, Ben Khemis, Hamza, Turki, & Turki, ) and between April and June for barbell (Ould‐Rouis, Ould‐Rouis, Micha, & Arab, ). Lower biomass observed in autumn (December) for the two reservoirs, can be attributed to the decrease in zooplankton and phytoplankton densities probably caused by high turbidity (Sellami et al, ).…”

Section: Discussionmentioning

confidence: 97%

“…The reservoir is mainly used as drinking water supply for the capital Tunis with 40 Mm 3 /year (Soudoud, ). The total phosphorus concentrations fluctuated from 0.003 to 0.2 mg/L (mean ± SD, 0.06 ± 0.04 mg/L) and chlorophyll a concentrations ranged from 0.07 to 5.7 mg/L (mean ± SD, 1.0 ± 1.1 mg/L) (Sellami, Ayadi, Bouain, Aleya, & Alaoui Mhamdi, ). Fishing statistics show the presence of pikeperch, mullet and barbell with an annual yield of 14.5 t (DGPA (Direction Générale de la Pêche et de l'Aquaculture), ).…”

Section: Methodsmentioning

confidence: 99%

“…The reservoir is mainly used as drinking water supply for the capital Tunis with 40 Mm 3 /year (Soudoud, 2006). The total phosphorus concentrations fluctuated from 0.003 to 0.2 mg/L (mean ± SD, 0.06 ± 0.04 mg/L) and chlorophyll a concentrations ranged from 0.07 to 5.7 mg/L (mean ± SD, 1.0 ± 1.1 mg/L) (Sellami, Ayadi, Bouain, Aleya, & Alaoui Mhamdi, 2009)…”

Section: Seasonal Inter-calibration Between Acoustic and Multi-mesh Gmentioning

confidence: 99%

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Seasonal inter-calibration between acoustic and multi-mesh gillnets sampling for fish biomass assessment in reservoirs

Laouar

Djemali

2018

J Appl Ichthyol

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Summary This paper presents the results of an inter‐calibration between acoustic and gillnets sampling in two North African reservoirs according to seasons. Gillnets with multi‐mesh were designed for sampling fish in lakes while acoustic surveys were performed with a split beam Simrad EK60 echosounder. Sampling events were carried out during summer (September 2015), autumn (December 2015), winter (March 2016) and spring (June 2016) in two Tunisian reservoirs (Kasseb and Siliana) with different depths and shapes. Gillnet catches showed a high proportion of barbell whatever the seasons in Kasseb Reservoir, while at Siliana Reservoir, significant seasonal changes in relative abundances have been evidenced. The highest fish biomass of the entire water column was observed in winter daytime (103 kg/ha) in Kasseb Reservoir and in summer daytime (283 kg/ha) in Siliana Reservoir. Average biomass observed in autumn (December) for the two reservoirs were lower than the other seasons. During spring, density daytime values in Kasseb were higher than during nighttime while it was the opposite in summer and autumn. Fish densities detected in Kasseb Reservoir in vertical beaming was higher than those detected in horizontal beaming (p < .05). The longitudinal distribution of fish in the reservoirs showed that there is no clear trend in fish densities according to strata. High numbers of fish were detected in deep strata and big fish were located in the surface water near the dam of Kasseb Reservoir. A significant linear correlation was showed between acoustic density/NPUE and acoustic biomass/BPUE but the perfect correlation with the 1:1 fit was showed only between acoustic biomass/BPUE.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Seasonal Inter-calibration Between Acoustic and Multi-mesh Gmentioning

confidence: 99%

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Seasonal inter-calibration between acoustic and multi-mesh gillnets sampling for fish biomass assessment in reservoirs

Laouar

Djemali

2018

J Appl Ichthyol

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“…In this system of highly connected reservoirs, Kasseb Reservoir provides the water for the Ghdir El Goulla Reservoir (Sellami et al, 2009). Connections between reservoirs can have positive and negative impacts on zooplankton communities.…”

Section: Discussionmentioning

confidence: 99%

Local and regional factors influencing zooplankton communities in the connected Kasseb Reservoir, Tunisia

Sellami¹,

Elloumi²,

Hamza³

et al. 2011

WSA

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Associations between zooplankton community structure and abiotic (temperature, dissolved oxygen, turbidity, nutriments) and biotic factors (chlorophyll a and phytoplankton community) were examined, in Kasseb Reservoir, northern Tunisia. Samples were taken bimonthly from July to December 2002 at 3 sampling stations (deepest station: Station 1, Brik River: Station 2 and M'Zaz Stama River: Station 3). From our results it is evident that zooplankton exhibit seasonally and spatially heterogeneous distribution. The highest density of zooplankton was recorded in September at a depth of 5 m (10.8 × 10). At Station 1 cyclopoid copepods (65% of total abundance) were the most abundant group followed by Cladocera (21% of total abundance). At Station 2 (93% of total abundance) and Station 3 (98% of total abundance) cyclopoid copepods were numerically dominant throughout the study period. Canonical correspondence analysis (CCA) was used to estimate the influence of abiotic and biotic factors in structuring the zooplankton assemblage. Zooplankton abundance was negatively correlated with turbidity (r= -0.381, P <0.05). The results also suggest that both local (environmental parameters, competition, and predation) and regional (hydrologic connections and dispersal) factors have a significant effect on both species richness and community structure of zooplankton in Kasseb Reservoir. The presence of zooplankton species considered to be indicators of eutrophic status confirmed the high trophic levels of Kasseb Reservoir.

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“…Subsequent papers (Dumont et al, 1979;Morgan, 1982;Soholobji et al, 1993;Ramdani et al, 2001;Sellami et al, 2010Sellami et al, , 2016Marrone et al, 2010Marrone et al, , 2013Marrone et al, , 2016bMontevago et al, 2020;Rogers et al, 2021) added some further occurrence localities but no new species to the Tunisian fauna, with the exceptions of Paradiaptomus similis Van Douwe, 1912 (reported as P. greeni (Gurney, 1906) by El Abed, 1999 andTurki, 2010) and Eudiaptomus sp. (Sellami et al, 2009;. Available synopses including data on Tunisian diaptomid fauna are those by Tollinger, (1911), Roy & Gauthier (1927a), Kiefer (1978), Dussart (1989), Zaouali (1995), Mouelhi et al (1999Mouelhi et al ( , 2000, Dussart & Defaye (2002), and Marrone et al (2017), although none of these reviews discuss the possible presence of Eudiaptomus species in the country.…”

Section: Bibliographical Reviewmentioning

confidence: 99%

The Diaptomidae (Copepoda, Calanoida) of Tunisia and the role of spatial and environmental factors as drivers of their distribution patterns

et al. 2023

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Even in a biodiversity hotspot such as the Mediterranean basin, aspects relating to the distribution of some groups of microcrustaceans still need clarification. In this paper, we critically analyse the available information on diaptomid copepods in Tunisian inland waters and, based on the largest sampling campaign to date carried out in the country, report new data on their distribution. In the frame of this study, 248 crustacean samples were collected from 190 sites, and 10 diaptomid species belonging to 7 genera and 2 subfamilies were found in the samples. Their distribution follows a climate gradient determined by precipitation, and ecological variables mainly affect diaptomid distribution in the study area, while pure spatial factors are of negligible importance. Diaptomid biodiversity is therefore strongly linked to the diversity of inland waters that characterise the country. This is especially true in the wetlands of the Medjerda alluvial plain, where six diaptomid species co-occurred sympatrically, with up to four or five species coexisting syntopically and synchronically in some sites. Unfortunately, the natural water bodies of this plain are currently strongly threatened by urban expansion and agricultural reclamation, and the risk of local extinction for the species they host is increasingly high.

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Distribution of zooplankton related to environmental factors in three interconnected reservoirs: Kasseb, Mornaguia and Ghdir El Goulla (North of Tunisia)

Cited by 5 publications

References 24 publications

Seasonal inter-calibration between acoustic and multi-mesh gillnets sampling for fish biomass assessment in reservoirs

Seasonal inter-calibration between acoustic and multi-mesh gillnets sampling for fish biomass assessment in reservoirs

Local and regional factors influencing zooplankton communities in the connected Kasseb Reservoir, Tunisia

The Diaptomidae (Copepoda, Calanoida) of Tunisia and the role of spatial and environmental factors as drivers of their distribution patterns

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