14 de Enero, 2012
Transcript of 14 de Enero, 2012
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Segundo Simposio
Internacional de
Estromatolitos
Bacalar, QR Mexico
13 – 14 de Enero, 2012
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Nanakuli beach laminated
communities at the edge of
an urban center.
Carmen Aguilar
School for Freshwater Sciences,
Great Lakes WATER Institute,
University of Wisconsin-
Milwaukee, USA
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Carmen Aguilar
• Egresada de la UNAM-Facultad de Biologia
• Interes -bacterias en la historia temprana de
la Tierra y el océano
• Bacterias que utilizan minerales para su
nutrición
• Y a la vez, bacterias que producen
minerales
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Quiero dedicar esta platica a la
Dra. Lynn Margulis
Fue la persona que me inspiro a
apreciar los “Tapetes
microbianos laminados” de
Guerrero Negro en Baja
California.
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Y al Dr. Claire Folsome del
laboratorio de Exobiología donde
realizé los estudios de los tapetes
de Nanakuli, Hawai’i
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"NANAKULI" BEACH PARK "To Look At The Knee"
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O2
H2S
Sunlight, UV light
Long wavelength PS bacteria
Sulfate reducers
Heterotrophic bacteria
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Layered biogeochemistry
Dupraz y Vishner
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"NANAKULI" BEACH PARK "To Look At The Knee"
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Nanakuli laminated communities
• Intertidal
• High Energy
• Not lithified
• N2 fixing
cyanobacteria
• Purple Photosynthetic
• heterotrophs
• Intermarea
• Energia alta
• Poca litificacion
• Con fijacion de
nitrogeno
• Bacterias purpuras
• heterotrofos
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Nanakuli
• Very thin over rocks
• Great model to model
growth in closed
systems
• Cyanobacteria-
Microcoleus,
Oscillatoria, Rivularia
• Red layer Chromatium
• Laminas delgadas
sobre rocas
• Buen modelo en
sistemas cerrados
• Cianobacterias
presentes Microcoleus,
Oscillatoria, Rivularia
• Capa roja Chromatium
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Bacalar-type Stromatolites
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Microbialites
• Guerrero Negro
• Cuatro Cienegas
• Laguna Bacalar
• Yellowstone National Park WY
• Shark Bay
• Bahamas- carbonate system
• Hawai’i
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Coupled cycles
Dupraz y Vishner
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Cyanobacterial layer
Calcite precipitation
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Some questions..
• Growth rate under low nutrient conditions
• Why are the microbialites only on the edge
• How much phosphate is associated with the carbonate sediments
• Crecimiento en concentracion baja de nutrientes
• ?Porque hay mas microbialitos rn la orilla?
• Cuanto fosforo se encuentra en el sedimento de carbonato de calcio
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Research / Investigación
• Measurement of Mg and Ca in the water and microbialites
• What is the importance of magnesium
• What is the effect of UV light –use of actinometers
• Medir la concentracion de Mg y Ca tanto en el agua como en los microbialitos
• Cual es la importancia del magnesio
• Cual es el efecto de la radiacion UV-uso de actinometros
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Thank you / Gracias