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How do lake microbial communities respond to large earthquakes?

Led by PhD student Katie Brasell the study Lake microbial communities are not resistant or resilient to repeated large-scale natural pulse disturbances just published in the journal Molecular Ecology explores how lake bacteria recover following a series of four magnitude 8 earthquakes over a 1000-year period. The study focuses on Lake Paringa on the West Coast. The research found that during the 50 years after each earthquake, when the lake sediment cause by landslides in the surrounding landscapes entered the lake, the bacteria community changed, but thereafter returned to same composition as pre-earthquake. However, the fourth earthquake in 1717, caused a much greater amount of sediment to enter the lake, and this caused a complete shift in the bacteria community – what scientists call a ‘regime shift.’ The bacterial community has never return to the pre-earthquake structure.

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Congratulations Jamie Howarth

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Lakes Appreciation Month – What do we value about our lakes?

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New manuscript on Rototoa (Auckland)

New manuscript on Lake Rototoa in Auckland has bee New manuscript on Lake Rototoa in Auckland has been published!!

A new manuscript titled - Resolving 500 years of anthropogenic impacts in a mesotrophic lake: Nutrients outweigh other drivers of lake change - led by Dr Rose Gregersen (Victoria University of Wellington) has been published in the prestigious journal Environmental Science & Technology.

The research explores the history of Rototoa, a lake in the Auckland region of Aotearoa-New Zealand. The researches combined sediment core analysis with historical data, and ecological experiments to determine what was causing the decline in lake health in recent decades. 

The researchers show that the health of the lake remained stable despite catchment deforestation and erosion, and the introduction of several non-native fish species. The most significant and sustained changes in lake health coincided with nitrogen and phosphorus fertilizers in the catchment.

Congratulations Rose on your excellent research!

Visit www.lakes380.com for a link to the full manuscript.

#Lakes380 #Cawthron #GNS #ScienceLife #NZscience #research #researchLife #VictoriaUniversityofWellington #Aucklandlakes #rototoa #paleolimnology #sedimentcores
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