Hydrologie, agro-écologie et superficies d’inondation dans le delta intérieur du Niger

Orange, Didier; Mahé, Gil; Dembelé, L.; Diakité, Cheik Hamalla; Kuper, Marcel; Olivry, Jean-Claude

doi:10.4000/books.irdeditions.8538

Cited by 5 publications

(13 citation statements)

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“…Besides the Niger River itself and its floodplains, these wetlands feature numerous ponds and lakes whose characteristics are largely tied to the river's annual flooding patterns (Arfi, 2002;Orange et al, 2002). Batamani is a shallow pond in the floodplain near Mopti, seasonally connected by a short channel to the Niger River during the flood (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Ble

Arfi

2009

Knowl. Managt. Aquatic Ecosyst.

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Key-words: omnivorous fish, natural food, nutritive value, climate, Batamani Pond, MaliThe chemical composition of the stomach contents and the digestibility of organic matter, proteins and energy of three planktivorous fish species (Oreochromis niloticus, Sarotherodon galilaeus and Citharinus citharus) were studied in Batamani Pond (Mali, West Africa) during the dry and wet seasons. The diet contents of O. niloticus and S. galilaeus presented high levels of organic matter and proteins during the wet season (ashfree dry weight (AFDW): 753 mg·g −1 dw and 703 mg·g −1 dw, protein contents: 479 mg·g −1 AFDW and 449 mg·g −1 AFDW, respectively). In the dry season, the chemical composition of the food was characterized by high proportions of inorganic material (73% and 68% for O. niloticus and S. galilaeus, respectively). The chemical composition of the food of C. citharus was characterized by low seasonal variation. The levels of AFDW (396-461 mg·g −1 dw) and proteins (65-86 mg·g −1 AFDW) in its diet were generally low, reflecting a high proportion of mineral content. During the wet season, the digestibility of AFDW (52% and 58%), total amino acids (68% and 76%) and energy (63% and 56%) increased significantly for O. niloticus and S. galilaeus, respectively. Nutrient and energy digestibility for C. citharus showed no significant seasonal variations (AFDW: 36-45%; total amino acids: 57-64%; energy: 31-39%). The marked seasonal character of the pond, in terms of both hydrology and trophic conditions, had a low impact on the availability and quality of nutritive resources for the two tilapia species O. niloticus and S. galilaeus, while C. citharus appears to have the capacity to adapt its regime to the available food quality, whatever the season.

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Section: Introductionmentioning

confidence: 99%

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Ble

Arfi

2009

Knowl. Managt. Aquatic Ecosyst.

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“…The interpretation of this result is difficult since no local studies are known that confirmed the changes in the October's flood area extent. However, Zwarts et al [1] and Orange et al [3] explained that this result might be an effect of the delay of the high water wave through the Niger Inland Delta which varies between 1 and 2 months. (Figure 8).…”

Section: Comparing Remotely Sensed Flooded Areas With Previous Estimatesmentioning

confidence: 99%

“…The annual cumulative ET loss over the entire NID ranges approximately between 12.71 and 21.78 km 3 [16]). However, uncertainties from remotely sensed flooded areas are expected to be more determinant with regards to wetland's evapotranspiration estimates.…”

Section: Comparing Water Balance Components With the Previous Studiesmentioning

confidence: 99%

“…The Niger River has a total length of 4200 km [1], flowing from its source high on the Fouta Djallon Mountains in the South of Guinea at an altitude about 800 m, through Guinea, Mali, Niger, and Nigeria, before discharging approximately 175 km 3 annually into the Atlantic Ocean through an extensive delta [2]. The river flows Northeast through the Upper Niger basin and enters the Niger Inland Delta (NID) in Mali; a evaporation measurements.…”

Section: Introductionmentioning

confidence: 99%

“…While most previous studies have underestimated water losses in the basin resulting from evaporation, the main component of water loss in wetlands [17], very few studies have considered additional water losses through water withdrawal for irrigation purposes, that are estimated to amount to 2.69 km 3 /year of water on average [1].…”

Section: Introductionmentioning

confidence: 99%

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Water Balance Analysis over the Niger Inland Delta-Mali: Spatio-Temporal Dynamics of the Flooded Area and Water Losses

et al. 2017

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Abstract:The Niger Inland Delta (NID) wetland comprises a large flooded area that plays an important role in the ecosystem services. This study provides a comprehensive understanding of the NID's hydro-climatological functioning using water balance approach. After a clear description of the water budget's elements specific to the NID catchment, a spatial and temporal dynamics of the annual flood across the NID over the period 2000-2009 was performed using data from satellite QuickSCAT and its associated sensor SeaWinds. The estimated areas were used along with observed discharge and remotely-sensed climatic data to quantitatively evaluate each water balance component. The results indicate: (i) a clear spatiotemporal of the flooded areas varied between 25,000 km 2 in wet periods and 2000 km 2 in dry periods; (ii) an average evapotranspiration loss of 17.31 km 3 (43% of the total inflow) was assessed in the catchment; (iii) precipitation's contribution to the NID's budget totals 5.16 km 3 (12.8% of the total inflow); and (iv) the contribution of return flow from irrigated fields totals 1.8 km 3 (4.5% of the total inflow, among which 1.2 km 3 are from Office du Niger) to the flooded areas, refined the NID's water balance estimates. Knowledge gained on NID's water balance analysis will be used to develop and calibrate hydrological models in the Niger Inland Delta of the basin.

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Vulnerability and adaptation of African rural populations to hydro-climate change: experience from fishing communities in the Inner Niger Delta (Mali)

et al. 2012

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Hydrologie, agro-écologie et superficies d’inondation dans le delta intérieur du Niger

Cited by 5 publications

References 0 publications

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Water Balance Analysis over the Niger Inland Delta-Mali: Spatio-Temporal Dynamics of the Flooded Area and Water Losses

Vulnerability and adaptation of African rural populations to hydro-climate change: experience from fishing communities in the Inner Niger Delta (Mali)

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