Publications by authors named "A Ehrhold"
To evaluate the stability and resilience of coastal ecosystem communities to perturbations that occurred during the Anthropocene, pre-industrial biodiversity baselines inferred from paleoarchives are needed. The study of ancient DNA (aDNA) from sediments (sedaDNA) has provided valuable information about past dynamics of microbial species and communities in relation to ecosystem variations. Shifts in planktonic protist communities might significantly affect marine ecosystems through cascading effects, and therefore the analysis of this compartment is essential for the assessment of ecosystem variations.
View Article and Find Full Text PDFThe Holocene period (last 11,700 years BP) has been marked by significant climate variability over decadal to millennial timescales. The underlying mechanisms are still being debated, despite ocean-atmosphere-land connections put forward in many paleo-studies. Among the main drivers, involving a cluster of spectral signatures and shaping the climate of north-western Europe, are solar activity, the North Atlantic Oscillation (NAO) varying atmospheric regimes and North Atlantic oceanic gyre dynamics.
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- Researchers investigated how to revive dormant dinoflagellate cysts buried for about 150 years using melatonin and gibberellic acid, substances commonly used to kickstart seed growth.
- The study successfully revived 11 dinoflagellate taxa from century-old sediments, extending the known viability of these cysts beyond 100 years.
- It was found that while lower concentrations of the biostimulants promoted germination, higher doses inhibited it, indicating that careful dosing is crucial for effective revival of these ancient organisms.