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Motivation Arbuscular mycorrhizal (AM) fungi are central to plant nutrient acquisition, soil carbon dynamics, and ecosystem resilience. Yet, their biogeography remains incompletely characterised, particularly across underrepresented regions. Australia, with its characteristic ecological conditions, continental scale, and long‐standing evolutionary trajectories, has been notably undersampled. This gap hinders our ability to mak...
Evaluating the Usefulness of the C‐S‐R Framework for Understanding AM Fungal Responses to Climate Change in AgroecosystemsNARA Subscribed
Arbuscular mycorrhizal (AM) fungi play a key role in terrestrial ecosystems by forming symbiotic relationships with plants and may confer benefits for sustainable agriculture, by reducing reliance on harmful fertiliser and pesticide inputs and enhancing plant resilience against insect herbivores. Despite their ecological importance, critical gaps in understanding AM fungal ecology limit predictions of their responses to global...
Silicon accumulation suppresses arbuscular mycorrhizal fungal colonisation in the model grass Brachypodium distachyonNARA Subscribed
Purpose Silicon (Si) accumulation by grasses alleviates diverse biotic and abiotic stresses. Despite this important functional role, we have limited understanding of how root microbial symbionts, such as arbuscular mycorrhizal (AM) fungi, affect Si uptake and even less about how Si supply and accumulation affect AM fungal colonisation. Our objective was to determine the nature of this two–way interaction in the model grass, Br...
Prolonging survival in good health is a fundamental societal goal. However, the leading determinants of disability-free survival in healthy older people have not been well established. Data from ASPREE, a bi-national placebo-controlled trial of aspirin with 4.7 years median follow-up, was analysed. At enrolment, participants were healthy and without prior cardiovascular events, dementia or persistent physical disability. Disab...
Targeted plant defense: silicon conserves hormonal defense signaling impacting chewing but not fluid‐feeding herbivoresNARA Subscribed
Plants deploy an arsenal of chemical and physical defenses against arthropod herbivores, but it may be most cost efficient to produce these only when attacked. Herbivory activates complex signaling pathways involving several phytohormones, including jasmonic acid (JA), which regulate production of defensive compounds. The Poaceae also have the capacity to take up large amounts of silicon (Si), which accumulates in plant tissue...
δ 56 Fe in seabird guano reveals extensive recycling of iron in the Southern Ocean ecosystemNARA Subscribed
Availability of iron limits productivity in the Southern Ocean where vast regions of high‐nitrogen low‐chlorophyll conditions are punctuated by hotspots of production surrounding the subAntarctic islands. Here, we compare patterns in accumulation of iron, as indicated by [Fe] and Fe : C (from Wing et al. ), with proxies for uptake of iron within food webs, as indicated by Fe : Al and δ 56 Fe within the subAntarctic Auckland Is...
Sea ice microbial production supports Ross Sea benthic communities: influence of a small but stable subsidyNARA Subscribed
Diversity in guilds of primary producers enhances temporal stability in provision of organic matter to consumers. In the Antarctic ecosystem, where temporal variability in phytoplankton production is high, sea ice contains a diatom and microbial community (SIMCO) that represents a pool of organic matter that is seasonally more consistent, although of relatively small magnitude. The fate of organic material produced by SIMCO in...
We examined nitrogen (N) uptake in seven grassland streams lying in catchments along a gradient (0–84%) of agricultural land use in New Zealand using a stable isotope ( 15 N) addition of NH 4 + to quantify whole‐stream uptake rates and uptake by specific compartments within the streams. Whole‐stream uptake of NH 4 + ranged from 1.2 mmol N m −2 min −1 to 7.9 mmol N m −2 min −1 and showed no evidence of strong saturation of upta...
Patterns in the δ13C and δ15N signature of Ulva pertusa: Interaction between physical gradients and nutrient source poolsNARA Subscribed
Field surveys and laboratory experiments were used to investigate the influence of the physical environment on variability in δ 13 C and δ 15 N signatures of Ulva pertusa , an abundant macroalgae inhabiting the low salinity layer (LSL) of Doubtful Sound, a New Zealand fjord. Field surveys revealed significant spatial variability in δ 13 C (‐18% to ‐12%) and δ 15 N (0% to 6%). δ 13 C was enriched at high irradiance sites and de...
SMART-1 after lunar capture: First results and perspectivesNARA Subscribed
Iron uptake and physiological response of phytoplankton during a mesoscale Southern Ocean iron enrichmentNARA Subscribed
Iron supply is thought to regulate primary production in high nitrate, low chlorophyll (HNLC) regions of the sea in both the past and the present. A critical aspect of this relationship is acquisition of iron (Fe) by phytoplankton, which occurs through a complex series of extracellular reactions that are influenced by Fe chemistry and speciation. During the first in situ mesoscale Fe‐enrichment experiment in the Southern Ocean...
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