Abrupt onset of carbonate deposition in Lake Kivu during the 1960s: Response to recent environmental changes
- Authors: Pasche, Natacha , Alunga, Georges , Mills, Keely , Muvundja, Fabrice , Ryves, David , Schurter, Michael , Wehrli, Bernard , Schmid, Martin
- Date: 2010
- Type: Text , Journal article
- Relation: Journal of Paleolimnology Vol. 44, no. 4 (2010), p. 931-946
- Full Text: false
- Reviewed:
- Description: This study interprets the recent history of Lake Kivu, a tropical lake in the East African Rift Valley. The current gross sedimentation was characterized from a moored sediment trap array deployed over 2 years. The past net sedimentation was investigated with three short cores from two different basins. Diatom assemblages from cores were interpreted as reflecting changes in mixing depth, surface salinity and nutrient availability. The contemporary sediment trap data indicate seasonal variability, governed by diatom blooms during the annual mixing in the dry season, similar to Lakes Malawi and Tanganyika. The ratio of settling fluxes to net sediment accumulation rates implies mineralization rates of 80-90% at the sediment-water interface. The sediment cores revealed an abrupt change ~40 years ago, when carbonate precipitation started. Since the 1960s, deep-water methane concentrations, nutrient fluxes and soil mineral inputs have increased considerably and diatom assemblages have altered. These modifications probably resulted from a combination of three factors, commonly altering lake systems: the introduction of a non-native fish species, eutrophication, and hydrological changes inducing greater upwelling. Both the fish introduction and increased rainfall occurred at the time when the onset of carbonate precipitation was observed, whereas catchment population growth accompanied by intensified land use increased the flux of soil minerals already since the early twentieth century due to more intense erosion. © 2010 Springer Science+Business Media B.V.
Looking Deeper
- Authors: Groothuis, Marijke
- Date: 2008
- Type: Text , Visual art work
- Full Text: false
"The Big Cigar, a monument to Winston Churchill, Churchill
- Date: 1984-1995
- Type: Still Image , Photographs and video exhibition
- Relation: Centre for Gippsland Studies. La Trobe Regional Commission Images
- Full Text: false
- Description: Original format: 10 x 15 cm
Woorarra, county of Buln Buln
- Date: 1943
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 104 x 57 cm.
- Description: Scale: 1 inch to 20 chains
- Description: Plan of the Mt Fatigue and Woorarra areas of the Strzelecki Ranges.
Dulungalong, county of Buln Buln
- Date: 1939
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 48 x 67 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Lake Wellington around Lake Coleman and Lake Reeve showing freehold and other landholdings. Notations show land acquired for other purposes.
Dulungalong, county of Buln Buln
- Date: 1939
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 48 x 68 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Lake Wellington around Lake Coleman and Lake Reeve, showing freehold and other landholdings. Notations show land acquired for Dutson Downs waste disposal farm and for real estate development.
Stradbroke, county of Buln Buln
- Date: 1936
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 37 x 47 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of the eastern part of the parish of Stradbroke, south of Rosedale and Longford and around the township of Stradbroke. Notations show changes in land ownership.
Tourists map north eastern Victoria: Bogong High Plains, Mt. Buffalo &c.
- Date: 1933
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 39 x 48 cm.
- Description: Scale: 1 inch to 8 miles
- Description: Inset: Bogong High Plains, lines of snow poles
Glencoe South, county of Buln Buln
- Date: 1932
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 68 x 39 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Longford.
Booran, county of Buln Buln
- Date: 1928
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 48 x 36 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Lake Wellington around Lake Reeve, showing landholdings. Notations show land reserved for public purposes from the 1970s.
Booran, county of Buln Buln
- Date: 1928
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 46 x 35 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Lake Wellington around Lake Reeve showing landholdings. Notations show land reserved for public purposes from the 1970s.
Seacombe, counties of Buln Buln and Tanjil
- Date: 1928
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 68 x 41 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area between Lake Victoria and Lake Reeve around Seacombe, with notations showing land acquired for public purposes from the 1970s.
Tourist map Warburton, Mt. Baw Baw, Walhalla
- Date: 1925
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 60 x 39 cm.
- Description: Scale: 1 inch to 3 miles
- Description: Map showing tracks from Warburton to Walhalla and Wood's Point, with descriptive track notes.
- Description: Insets: Sketch map of Yarra Falls, Railway routes, Baw Baw Plateau
Glencoe South sheet 2
- Date: 1922
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 33 x 32 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Longford showing landholdings, with notations showing changes in ownership and land controlled by Latrobe Valley Water and Sewerage Board.
Glencoe South, county of Buln Buln
- Date: 1922
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 41 x 38 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of an area south of Longford showing landholdings, with notations showing changes in ownership.
Giffard, county of Buln Buln
- Date: 1914
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 65 x 36 cm.
- Description: Scale: 1 inch to 40 chains
- Description: Plan of the area around Seaspray, showing P.C. Buckley's Prospect Estate and land acquired for closer settlement.
Tourists map of Buffalo National Park
- Date: 1911
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 45 x 51 cm.
- Description: Scale: 1 inch to 50 chains
- Description: Map showing topography, roads, tracks and tourist attractions in Buffalo National Park, with descriptive notes and tourist information.
- Description: Inset: locality plan
Koorool, county of Tanjil
- Date: 1910
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 58 x 50 cm.
- Description: Scale: 1 inch to 20 chains
- Description: Continuation of a plan of the area north of Valencia Creek showing landholdings, with notations recording changes in ownership.
Parish of St Margaret, county of Buln Buln
- Date: 1892
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 102 x 69 cm.
- Description: Scale: 1 inch to 20 chains
- Description: Plan of St Margaret Island and the nearby Ninety Mile Beach.
Buln-Buln sheet no.2, eastern half
- Date: 1886
- Type: Map
- Relation: Centre for Gippsland Studies Maps
- Full Text: false
- Description: Original format: 40 x 59 cm.
- Description: Scale: 1 inch to 2 miles
- Description: The County of Buln Buln, a part of the Land Classification series (LC7A) held by the Central Plan Office, Melbourne.
- Description: Insets: 3 continuations