The influence of natural and anthropogenic factors on mangrove dynamics over 60 years: The Somone Estuary, Senegal

Sakho, I.; Mesnage, Valérie; Deloffre, Julien; Lafite, Robert; Niang, Isabelle; Faye, Guilgane

doi:10.1016/j.ecss.2011.05.032

Cited by 59 publications

(27 citation statements)

References 44 publications

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“…Otherwise, the population increase has led to an unprepared occupation of sensitive areas the shoreline, in the lagoons borders [63], exacerbated by the emergence of activities such as tourism. According to [29], increasing seaside tourism was accompanied by the real estate and construction pressures and unregulated development of the Somone coastline. In the Ceuta coastal lagoon system, Sinaloa, Mexico, the development of shrimp aquaculture is causing a new pressure on this environment, and it has changed the coastal landscape covering 3190 ha in less than 15 years, mainly replacing bare soil and salt marsh [64].…”

Section: Discussionmentioning

confidence: 99%

“…Until 1990, this was mainly a result of traditional wood harvesting [29]. Comparatively, In Delta State, Nigeria, high rates of deforestation in mangroves were linked mainly to agriculture and aquaculture activities [62].…”

Section: Discussionmentioning

confidence: 99%

“… Temperature Time Series In 1999, six dams were built in Bandia, about 3km from the mouth of the river in its upstream section to encourage floristic development and water for wildlife in the Bandia reserve. Also, in 2000, three more dams were constructed in Kissane, about 25 km from the mouth of the river [29].…”

Section: Relating To Shifts Detection Testmentioning

confidence: 99%

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Assessment of Climate Trends and Land Cover/Use Dynamics within the Somone River Basin, Senegal

Barry¹,

Traoré²,

Ndiaye³

et al. 2017

AJCC

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This study was undertaken mainly to 1) investigate temporal trends in annual rainfall and temperature; 2) identify discontinuities in the time series; and 3) assess the Land Use/Land Cover Change (LULC) in the Somone coastal lagoon, within the river basin. The study examined temporal trends in rainfall (1931-2016) and temperature (1961-2016) datasets of Somone river basin, and breaks in time series using Mann-Kendall non-parametric test and other suitable statistical tools. Temporal evolution in LULC was assessed for the years 1954, 1978, 2003 and 2016. Analysis indicates a significant decreasing trend in precipitation over the basin. These trends are much more pronounced for minimum and average rainfall than for maximum and annual amplitudes. Contrary to precipitation, surface air temperature shows a significant increasing trend for its minimum and averages, and a decreasing trend for its maximum and amplitudes. A significant break in precipitation was observed in 1958, while surface air temperature presents much longer breaks within the years 1975 and 1977, and 1991 and 1993. A more direct implication of climate change on LULC patterns is increased in unproductive salt pans (Sabkhas). Increase in Sabkhas gave rise to conversion of forest lands to agricultural lands of local farmers in search for fertile soils to cater for the food needs of a growing population. Otherwise, the development of the settlements, favored by the tourism activity and agriculture crisis, is another cause of croplands decreasing. The findings of the present research clearly indicate that the impacts of climate change are exacerbated by rapid urbanization in the basin.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Assessment of Climate Trends and Land Cover/Use Dynamics within the Somone River Basin, Senegal

Barry¹,

Traoré²,

Ndiaye³

et al. 2017

AJCC

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“…The construction of road embankments may also alter connectivity of coastal ecosystems, including mangrove forests (Jimenez, Lugo, & Cintron, 1985), by permanently altering the flow of water and sediment (Röderstein, Perdomo, Villamil, Hauffe, & Schnetter, 2014). Modifications of hydrological regimes due to human actions appear to be the main reason for mangrove mortality in the tropics (Barreto, 2008;Sakho et al, 2011). Blockage and reductions of tidal flushing and freshwater input from by road embankments have been shown to change the structure, vigour, and mortality patterns of mangrove stands by altering salinity, nutrients, redox potentials, pH, sediment, and organic matter content (Cardona & Botero, 1998;Rivera-Monroy et al, 2011).…”

Section: Stream Obstruction and Landscape Connectivitymentioning

confidence: 99%

Ecohydrological disturbances associated with roads: Current knowledge, research needs, and management concerns with reference to the tropics

et al. 2017

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Roads are a pervasive form of disturbance with potential to negatively affect ecohydrological processes. Some of the most rapid growth in road networks is occurring in developing countries, particularly in the tropics, where political agendas are often focused on strengthening the economy, improving infrastructure, bolstering national security, achieving self‐sufficiency, and increasing citizen well‐being, often at the expense of the environment. We review what is known about road impacts on ecohydrological processes, focusing on aquatic systems, both temperate and tropical. We present seven cases that represent the broader trends of road development and impacts in tropical settings. Many of these process dynamics and impacts are not different from those experienced in temperate settings, although the magnitude of impacts in the tropics may be amplified with intense rainfall and lack of best management practices applied to road construction/maintenance. Impacts of roads in tropical settings may also be unique because of particular organisms or ecosystems affected. We outline a set of best practices to improve road network management and provide recommendations for adopting an agenda of research and road management in tropical settings. Importantly, we call for incorporation of transdisciplinary approaches to further study the effects of roads on ecohydrological processes in the tropics. Specific emphasis should also be placed on collaboration with governments and developers that are championing road development to help identify the drivers of road expansion and thresholds of negative impact, as well as methods of sustainable road construction and maintenance.

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“…Crepis sancta) [35] and ecosystem-engineers. For example, ecosystem-engineers include dune and marsh plants [36] and mangroves [37], which have functional roles in maintaining the structures of estuarine and coastal environments. Emerging evidence of rapid evolution and the potential for eco-evolutionary feedback (reciprocal influences of ecology Table 1.…”

Section: Introductionmentioning

confidence: 99%

Urban driven phenotypic changes: empirical observations and theoretical implications for eco-evolutionary feedback

Alberti

Marzluff

Hunt

2017

Phil. Trans. R. Soc. B

189

109

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One contribution of 18 to a theme issue 'Human influences on evolution, and the ecological and societal consequences'. Emerging evidence that cities drive micro-evolution raises the question of whether rapid urbanization of Earth might impact ecosystems by causing systemic changes in functional traits that regulate urban ecosystems' productivity and stability. Intraspecific trait variation-variation in organisms' morphological, physiological or behavioural characteristics stemming from genetic variability and phenotypic plasticity-has significant implications for ecological functions such as nutrient cycling and primary productivity. While it is well established that changes in ecological conditions can drive evolutionary change in species' traits that, in turn, can alter ecosystem function, an understanding of the reciprocal and simultaneous processes associated with such interactions is only beginning to emerge. In urban settings, the potential for rapid trait change may be exacerbated by multiple selection pressures operating simultaneously. This paper reviews evidence on mechanisms linking urban development patterns to rapid phenotypic changes, and differentiates phenotypic changes for which there is evidence of micro-evolution versus phenotypic changes which may represent plasticity. Studying how humans mediate phenotypic trait changes through urbanization could shed light on fundamental concepts in ecological and evolutionary theory. It can also contribute to our understanding of eco-evolutionary feedback and provide insights for maintaining ecosystem function over the long term.This article is part of the themed issue 'Human influences on evolution, and the ecological and societal consequences'.

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The influence of natural and anthropogenic factors on mangrove dynamics over 60 years: The Somone Estuary, Senegal

Cited by 59 publications

References 44 publications

Assessment of Climate Trends and Land Cover/Use Dynamics within the Somone River Basin, Senegal

Assessment of Climate Trends and Land Cover/Use Dynamics within the Somone River Basin, Senegal

Ecohydrological disturbances associated with roads: Current knowledge, research needs, and management concerns with reference to the tropics

Urban driven phenotypic changes: empirical observations and theoretical implications for eco-evolutionary feedback

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