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Distribution of bacteria in lakes of Aotearoa-New Zealand

A new paper led by John Pearman (shown in picture below, on right) was recently published in Frontiers in Microbiology. It looks at the distribution patterns of bacteria in the water column of lakes in Aotearoa-New Zealand. ⁠ You can read it here.
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Samples were taken from the surface water of 167 lakes spread across Aotearoa-New Zealand. DNA was extracted from the water samples and bacterial DNA was amplified and sequenced.⁠
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Most of the diversity was rare with only a few amplicon sequence variants (ASVs; think of them as DNA species) were abundant across the lakes⁠
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Only a few ASVs had a wide distribution in the lakes with the majority being restricted to one or a few lakes. ⁠
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Some ASVs had a restricted distribution in the sampling but had a relatively high abundance. A portion of these could be attributed to cyanobacteria and could indicate that cyanobacterial blooms, those occurrences that can stop swimming in the lakes, were present. ⁠
⁠
The distribution patterns for the abundant bacteria were more determined by changes in the environmental variables influencing the lake (e.g nutrients and temperature) and less with spatial dispersal limitations. However the rare bacteria were influenced to the same amount by spatial and environmental conditions. ⁠


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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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