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Groundwater effects on diversity and abundance of lagoonal seagrasses in Kenya and on Zanzibar Island (East Africa)
Citatie
Kamermans P., Soetaert K. 1998:Groundwater effects on diversity and abundance of lagoonal seagrasses in Kenya and on Zanzibar Island (East Africa). Netherlands Institute of Ecology; Centre for Estuarine and Marine Ecology, Netherlands. Metadata available at http://data.nioo.knaw.nl/imis.php?module=dataset&dasid=1170

Gearchiveerde data

Gearchiveerd bestand:
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Beschrijving
Seagrass species diversity and abundance were studied in East African back-reef lagoons with contrasting groundwater-outflow rates. The selection of the lagoons was based on a groundwater flow model. meer

A total of ten seagrass species was observed at all sites together. Sites with a higher groundwater outflow displayed a lower species diversity than sites with a lower groundwater outflow. Thalassodendron ciliatum dominated at sites with high groundwater outflow rates, while Thalssia hemprichii showed higher coverage at sites with low groundwater outflow. Porewater salinities were significantly lower at locations with high groundwater-outflow rates indicating supply of freshwater. Nitrogen stable isotope signatures of seagrass leaves showed a significant increase with increased groundwater-outflow rates. This suggests that the nitrogen source for these plants was, at least for a part, groundwater. In addition, lagoons with high densities of the human population had highest 15N values, indicative of anthropogenic nitrogen inputs. Differences in optimum salinity for growth between species and competition for nitrogen may explain the observed pattern in species diversity and abundance.

Scope
Thema's:
Biologie, Biologie > Planten, Geologie - Geofysica - Sedimentatie, Geologie - Geofysica - Sedimentatie > In-situ zeebodem data, Geologie - Geofysica - Sedimentatie > Sedimenten - Rotsen - Poriewater
Kernwoorden:
Marien, Modellering, Overvloed, Saliniteit, Soortendiversiteit, Stikstof, Tropical environment, Zeegras, ISW, Kenyan Coast, ISW, Mozambique, Inhaca, ISW, Tanzania, Zanzibar, Thalassia hemprichii (Ehrenberg) Ascherson, 1871, Thalassodendron ciliatum (Forsskål) Hartog, 1970

Geografische spreiding
ISW, Kenyan Coast Stations [Marine Regions]
zone 1
Coördinaten: MinLong: 39,8776; MinLat: -3,234 - MaxLong: 40,5514; MaxLat: -2,4192 [WGS84]
Coördinaten: MinX: 597500; MinY: 9642500 - MaxX: 672500; MaxY: 9732500 [UTM37S]
zone 2
Coördinaten: MinLong: 39,473; MinLat: -4,1389 - MaxLong: 40,1924; MaxLat: -3,098 [WGS84]
Coördinaten: MinX: 552500; MinY: 9542500 - MaxX: 632500; MaxY: 9657500 [UTM37S]
zone 3
Coördinaten: MinLong: 39,1127; MinLat: -4,7271 - MaxLong: 39,6981; MaxLat: -3,9578 [WGS84]
Coördinaten: MinX: 512500; MinY: 9477500 - MaxX: 577500; MaxY: 9562500 [UTM37S]
ISW, Mozambique, Inhaca [Marine Regions]
ISW, Tanzania, Zanzibar [Marine Regions]

Spreiding in de tijd
Maart 1997
Februari 1998

Taxonomische spreiding
Thalassia hemprichii (Ehrenberg) Ascherson, 1871 [WoRMS]
Thalassodendron ciliatum (Forsskål) Hartog, 1970 [WoRMS]

Parameters
% zeegras bedekking, Drooggewicht biomassa, Mediane korrelgrootte , Organische koolstof, Saliniteit, Stroomsnelheid water

Bijdrage door
Koninklijk Nederlands Instituut voor Onderzoek der Zee; NIOZ Yerseke, meerdata eigenaar

Dataset status: Gestart
Data type: Data
Data oorsprong: Onderzoek: veldonderzoek
Metadatarecord aangemaakt: 2007-03-22
Informatie laatst gewijzigd: 2014-01-10
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