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Author Perissinotto, Renzo
Title Ecology and Conservation of Estuarine Ecosystems : Lake St Lucia as a Global Model
Imprint New York : Cambridge University Press, 2013
©2013
book jacket
Descript 1 online resource (516 pages)
text txt rdacontent
computer c rdamedia
online resource cr rdacarrier
Note Intro -- Contents -- Contributors -- Foreword -- Preface -- Acknowledgements -- 1 South Africas first World Heritage Site -- 1.1 Introduction -- 1.2 Early efforts to protect Lake St Lucia: 1895-1947 -- 1.3 Lake St Lucia under divided management: 1947-2001 -- 1.3.1 Development of afforestation -- 1.3.2 ̀Krieĺ Commission of Enquiry -- 1.3.3 St Lucia Advisory Council -- 1.3.4 A ̀greateŕ protected area -- 1.3.5 Military activities -- 1.3.6 Wetlands of International Importance -- 1.3.7 Divided control by government continued -- 1.4 The controversial ̀St Luciá dune mining proposal -- 1.4.1 The environmental impact assessment process -- 1.4.2 The nature conservation and tourism alternative land use to mining -- 1.4.3 Involvement of interested and affected parties -- 1.4.4 Review Panel hearings -- 1.5 Decision of the South African Cabinet -- 1.6 Towards World Heritage Site listing -- 1.7 Outstanding universal values -- 1.8 Strengthening conservation measures -- 1.9 Future management imperatives -- 1.10 Conclusions -- 2 Management history -- 2.1 Introduction -- 2.2 1850s to 1950s: drainage of the Mfolozi floodplain -- 2.3 1951-1960: closure of the combined Mfolozi-St Lucia Mouth -- 2.4 1960-1968: stabilization of the St Lucia Mouth -- 2.5 1968-1972: severe drought and the canal in the Mkhuze Swamps -- 2.6 1973-1984: hydrological model and the Mfolozi Link Canal -- 2.7 1984-2000: Cyclone Domoina and its aftermath -- 2.8 2000 to present: the current drought -- 2.9 Future management -- 2.9.1 Management of sediments -- 2.9.2 Management of water quality -- 2.9.3 Management of the catchment areas -- 2.10 Assessment and lessons -- 3 Geological history -- 3.1 Introduction -- 3.2 Synthesis of the geological evolution of the St Lucia basin -- 3.3 The late Pleistocene and Holocene evolution of the St Lucia basin
3.3.1 Continental shelf aeolianites and canyons -- 3.3.2 Holocene marine transgression -- 3.3.3 Lake depth change -- 3.4 Evaluation of St Lucia sedimentation -- 3.4.1 St Lucia sedimentation -- 3.4.2 Sedimentation rate -- 3.4.3 Estuarine processes and future sediment dynamics -- 3.5 Conclusions -- 4 The marine environment -- 4.1 Introduction -- 4.2 The Agulhas Current -- 4.3 Inshore waters and currents -- 4.4 The Central Shelf -- 4.5 Marine influences on the St Lucia Mouth condition -- 4.6 Coastal productivity, nutrients, zooplankton and fish -- 4.7 Adult fish migrations offshore in relation to St Lucia Estuary -- 4.8 Offshore canyons and their potential impact on St Lucia Estuary -- 4.9 Coastal biogeography -- Acknowledgements -- 5 Catchment hydrology -- 5.1 Introduction -- 5.2 Hydrological context -- 5.2.1 Overview -- 5.2.2 Catchment topography -- 5.2.3 Soil types -- 5.2.4 Land-use patterns -- 5.2.5 Climate context -- 5.2.6 Floods -- 5.2.7 Droughts -- 5.3 Annual average runoff and sediment yields -- 5.4 Modelling the impact of land-use changes in the Mfolozi catchment -- 5.4.1 Methodology - the ACRU model -- 5.4.2 Daily rainfall data -- 5.4.3 Daily temperature and potential evaporation -- 5.4.4 Soil types -- 5.4.5 Reference state simulations -- 5.4.6 Current land use -- 5.4.7 Water budget in ACRU -- 5.4.8 Baseflow -- 5.4.9 Calibration of streamflow simulations -- 5.4.10 Sediment yields in ACRU -- 5.4.11 Calibration of sediment yields -- 5.4.12 Results - the effect of land use on runoff -- 5.4.13 Results - the effect of land use on sediment yields -- 5.5 Management implications -- 5.6 Conclusions -- Acknowledgements -- 6: The wetlands -- 6.1 Introduction -- 6.2 Connectivity of coastal plain wetlands and Lake St Lucia -- 6.3 Diversity and hydrogeomorphology of freshwater wetlands on the coastal plain
6.4 Floodplains of the coastal plain and their relationship with Lake St Lucia -- 6.4.1 Fluvial styles -- 6.4.2 Trunk stream clastic sedimentation -- 6.4.3 Accumulation of dissolved sediment -- 6.4.4 Floodplain ecosystem structure -- 6.4.5 Floodplain ecosystem functions - flood attenuation, sediment trapping -- 6.4.6 Human impacts on floodplains and their effect on connectivity -- Human activities on the Mfolozi floodplain -- Management of the Mfolozi for the benefit of Lake St Lucia -- Human activities on the Mkhuze floodplain -- 6.5 Valley-bottom wetlands: blocked valley lakes and wetlands -- 6.5.1 Geomorphology and hydrology -- 6.5.2 Ecosystem structure -- Groundwater recharge valley-bottom wetlands -- Groundwater discharge valley-bottom wetlands with limited input of fine clastic sediment -- Groundwater discharge valley-bottom wetlands that arise on the coastal plain -- 6.5.3 Ecosystem function -- 6.5.4 Human impacts -- 6.6 Depression wetlands on the coastal plain -- 6.7 Connectivity revisited: a framework for examining artificial impacts to wetlands -- 6.8 Future landscape development -- 6.9 Conclusion -- Acknowledgements -- 7 Estuary and lake hydrodynamics -- 7.1 Introduction -- 7.2 The water and salt budgets in different management scenarios -- 7.2.1 Scenario 1: separate inlets, with mouth manipulation to keep St Lucia open -- 7.2.2 Scenario 2: separate inlets, without mouth manipulation -- 7.2.3 Scenario 3: combined inlets, no mouth manipulation (i.e. a natural system) -- 7.2.4 Overview of historical human impacts -- 7.2.5 The effects of severe drought conditions -- 7.2.6 Trajectories through the salinity/water level state space -- 7.2.7 Occurrence and persistence statistics of water level and salinity states -- 7.2.8 Basin-scale heterogeneities -- 7.3 Wind-driven flows, waves and mixing -- 7.3.1 Wind set-up in the lake
7.3.2 Wind waves and sediment resuspension -- 7.4 Tidal inlet hydrodynamics and morphodynamics -- 7.4.1 Tide-driven exchange flows -- 7.4.2 Inlet stability -- 7.5 Sediment dynamics in the St Lucia/Mfolozi complex -- 7.5.1 Sediment yields and characteristics -- 7.5.2 Flocculation dynamics of fine sediments -- 7.5.3 Simplified budget for suspended sediments -- 7.6 Modelling the outcomes of management interventions -- 7.7 Links between physical and biological functioning -- 7.8 Summary and conclusions -- Acknowledgements -- 8 Groundwater hydrology -- 8.1 Introduction -- 8.2 Hydrogeological setting -- 8.2.1 Secondary porosity aquifers -- 8.2.2 Cretaceous aquiclude -- 8.2.3 Primary porosity aquifer -- 8.3 Groundwater distribution and utilization -- 8.3.1 Groundwater utilization in the secondary porosity aquifer -- 8.3.2 Groundwater utilization in the primary aquifer -- 8.4 Groundwater characteristics -- 8.4.1 Groundwater levels -- 8.4.2 Groundwater quality -- 8.4.3 Groundwater modelling -- 8.5 Groundwater recharge -- 8.5.1 Secondary porosity aquifers -- 8.5.2 Primary porosity aquifers -- 8.6 Groundwater discharge -- 8.6.1 Groundwater discharge into streams and rivers (baseflow) -- 8.6.2 Groundwater discharge into Lake St Lucia -- 8.7 Groundwater seepage -- 8.7.1 Changes in the drainage boundaries -- 8.7.2 Groundwater seepage with open mouth -- 8.7.3 Observed groundwater seepage during drought conditions with mouth closed and no connection with the Mfolozi River -- 8.7.4 Groundwater seepage during drought conditions with mouth closed and the Mfolozi diverted into St Lucia -- 8.8 Evaporation and land use -- 8.9 The dependence of Lake St Lucia on groundwater -- 8.9.1 Groundwater contribution to the water balance of Lake St Lucia and its ecological importance
8.9.2 Importance of groundwater in the maintenance of groundwater-dependent habitats along the shoreline of Lake St Lucia -- 8.10 Mpate River catchment -- 8.11 Lessons learnt about groundwater which can be applied to other systems -- 9 Physico-chemical environment -- 9.1 Introduction -- 9.2 Water depths and system partitioning -- 9.3 Salinity -- 9.4 Temperature -- 9.5 Turbidity -- 9.6 Irradiance -- 9.7 pH -- 9.8 Dissolved oxygen -- 9.9 Nutrient concentration -- 9.10 Sediment composition and size structure -- 9.11 Temporal variability and states of the St Lucia system -- Acknowledgements -- 10 Microalgae -- 10.1 Introduction -- 10.2 Diversity and community structure -- 10.2.1 Cyanobacteria -- 10.2.2 Dinophyceae -- 10.2.3 Haptophyceae and Chrysophyceae -- 10.2.4 Chlorophyceae -- 10.2.5 Bacillariophyceae -- 10.3 Biomass -- 10.4 Productivity -- 10.5 Exceptional blooms -- Acknowledgements -- 11 Macrophytes -- 11.1 Introduction -- 11.2 Distribution of macrophytes -- 11.2.1 Submerged macrophytes -- 11.2.2 Mangroves -- 11.2.3 Reeds, rushes and sedges -- 11.2.4 Salt marsh -- 11.3 Abiotic factors and macrophyte response -- 11.3.1 Mouth condition and water level fluctuations -- 11.3.2 Salinity -- 11.3.3 Life history traits -- 11.3.4 Interactions with other biotic components -- 11.4 Recent studies on response to drought and mouth closure -- 11.4.1 Mapping -- 11.4.2 Long-term transect monitoring -- 11.5 Summary of changes in macrophyte habitats -- 11.5.1 Natural conditions -- 11.5.2 The period 1952-2002 -- 11.5.3 The period 2002-2011 -- 11.6 Conservation and management -- 11.7 Future research -- 12 Benthic invertebrates -- 12.1 Introduction -- 12.2 Benthic macrofauna -- 12.2.1 Bivalves -- 12.2.2 Scylla serrata -- 12.2.3 Paratylodiplax blephariskios -- 12.2.4 Benthic macrofauna between wet and dry cycles -- 12.3 Meiofauna
12.4 Ecological importance of benthic fauna
An integrated synthesis of scientific knowledge and management information concerning the world's first protected, and Africa's largest, estuarine system
Description based on publisher supplied metadata and other sources
Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2020. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Link Print version: Perissinotto, Renzo Ecology and Conservation of Estuarine Ecosystems : Lake St Lucia as a Global Model New York : Cambridge University Press,c2013 9781107019751
Subject Natural history -- South Africa -- Saint Lucia, Lake.;Estuarine ecology -- South Africa -- Saint Lucia, Lake
Electronic books
Alt Author Stretch, Derek D
Taylor, Ricky H
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