S. Jenni results 34
· Newest (Page 1/2, per page 25)
Author: S. Jenni ×Clear All Filters
Search Results
Different Ferromanganese Concretion Morphologies Host Distinct Microbial Communities and Metal Accumulation Patterns in the Baltic SeaNARA Subscribed
Ferromanganese (Fe‐Mn) concretions are porous accumulations of iron and manganese (hydr)oxides. While recent studies suggest that microbes contribute to metal accumulation in Baltic Sea concretions, the detailed composition of microbial communities and their impact on metal enrichment across different concretion morphotypes remain unexplored. We investigated how microbes influence the accumulation and release of trace metals a...
Zircon ages and compositions record Quaternary magma mingling and plutonic-volcanic links on Ascension Island, South AtlanticNARA Subscribed
Isolated ocean islands pose challenges for managing volcanic hazards because of their remote locations. Some, such as Ascension Island in the South Atlantic, have diverse hazards associated with variable magmatic compositions and eruptive styles, as evidenced by past volcanic deposits. In this context, zircon ages and compositions provide insights into the timing and nature of magma generation, storage, and eruption. Specifica...
Aim The urgency for remote, reliable and scalable biodiversity monitoring amidst mounting human pressures on ecosystems has sparked worldwide interest in Passive Acoustic Monitoring (PAM), which can track life underwater and on land. However, we lack a unified methodology to report this sampling effort and a comprehensive overview of PAM coverage to gauge its potential as a global research and monitoring tool. To address this...
Using pollen in turbidites for vegetation reconstructionsNARA Subscribed
Turbidites, deposited by sub‐aqueous gravity flows, are common in sedimentary archives worldwide and present a unique challenge and opportunity when reconstructing past vegetation through pollen analysis. When sampling pollen from a sediment core for palaeovegetation records, it is common practice to target background sediments (i.e. pelagic sediment) and avoid sampling turbidites, as they are presumed to portray a misleading...
Middle Pleistocene environments, landscapes and tephrostratigraphy of the Armenian Highlands: evidence from Bird Farm 1, Hrazdan ValleyNARA Subscribed
The significance of the southern Caucasus in understanding Pleistocene hominin expansions is well established. However, the palaeoenvironments in which Palaeolithic occupation of the region took place are presently poorly defined. The Hrazdan river valley, Armenian Highlands, contains a rich Palaeolithic record alongside Middle Pleistocene volcanic, fluvial and lacustrine strata, and thus offer exciting potential for palaeoenv...
This paper provides a record and analysis of a site in east‐midland England, at which organic and soil material are found between two Middle Pleistocene tills. This is the first discovery of its kind in the area, and demonstrates unequivocally that the region was glaciated on two separate occasions, something that has long been inferred and articulated, but not actually demonstrated. The landforms, sediments and soils are stud...
Itrax μ‐XRF core scanning for rapid tephrostratigraphic analysis: a case study from the Auckland Volcanic Field maar lakesNARA Subscribed
Itrax micro X‐ray fluorescence (μ‐XRF) core scanning is a non‐destructive, rapid approach to measuring elemental concentrations and their variability in sediment cores. As such, it records elemental signatures of tephra layers, which serve as correlation tie points and chronological markers for these sedimentary archives of past climatic changes. The traditional tephra identification approach using electron microprobe‐based ge...
Resistance and tolerance allow organisms to cope with potentially life-threatening pathogens. Recently introduced pathogens initially induce resistance responses, but natural selection favors the development of tolerance, allowing for a commensal relationship to evolve. Mycosis by Pseudogymnoascus destructans , causing white-nose syndrome (WNS) in Nearctic hibernating bats, has resulted in population declines since 2006. The p...
Effect of torpor on host transcriptomic responses to a fungal pathogen in hibernating batsNARA Subscribed
Hibernation, the use of prolonged torpor to depress metabolism, is employed by mammals to conserve resources during extended periods of extreme temperatures and/or resource limitation. Mammalian hibernators arouse to euthermy periodically during torpor for reasons that are not well understood, and these arousals may facilitate immune processes. To determine whether arousals enable host responses to pathogens, we used dual RNA...
A fungal perspective on conservation biologyNARA Subscribed
Hitherto fungi have rarely been considered in conservation biology, but this is changing as the field moves from addressing single species issues to an integrative ecosystem‐based approach. The current emphasis on biodiversity as a provider of ecosystem services throws the spotlight on the vast diversity of fungi, their crucial roles in terrestrial ecosystems, and the benefits of considering fungi in concert with animals and p...