Stomatal regulation plays a critical role in controlling tree water loss and mediating atmosphere–vegetation–soil water coupling, yet the implications of species-specific differences in stomatal regulation on this coupling remain poorly understood. Drimys species possess primitive leaf anatomy with limited stomatal closure capacity, while Nothofagus exhibits more effective stomatal control. We compared multi-year sap flux data from these two co-occurring Southern Chilean species to evaluate how stomatal traits influence water-coupling dynamics across timescales. Using boosted regression tree modeling and wavelet coherence analysis, we found that while both species showed similar functional responses to environmental drivers, the relative importance of these drivers differed between them. Both Drimys and Nothofagus responded to VPD, but Drimys sap flux was more strongly influenced by soil moisture, particularly during early season wet periods and late-season drought. In contrast, Nothofagus showed greater dependence on light and vapor pressure deficit (VPD), reflecting tighter stomatal regulation. Wavelet coherence analyses further confirmed stronger soil moisture control of sap flux in Drimys, especially at weekly to sub-seasonal timescales, and provided evidence that stomatal regulation can either buffer or amplify late-season soil moisture deficits. These findings suggest Drimys follows a high water use, low-conservation strategy closely tied to soil moisture, whereas Nothofagus demonstrates more conservative water use governed by atmospheric conditions. The strong soil moisture dependence of Drimys may increase its vulnerability to future warming and drying trends, with implications for forest composition and hydrological modeling in a changing climate.

Understanding the functioning and resilience of marine ecosystems requires identifying the main energy flow pathways. Key trophic groups occupy strategic positions in the trophic interactions network, acting as hubs that control the energy distribution across the ecosystem. This study examines the Bay of Biscay’s pelagic food web using stable isotope analysis with stomach content data, creating a network of 38 trophic groups and 125 interactions. Both annual-weighted and seasonal (spring and late summer) networks were constructed. The analysis of unweighted and weighted annual networks found that low-trophic level epipelagic fish (European anchovy, Engraulis encrasicolus; sardine, Sardina pilchardus; and sprat, Sprattus sprattus) is a key trophic group displaying higher scores in many centrality indices. These forage fish play a central role in facilitating energy transfer across trophic levels, thus representing a critical link between the planktonic food web and higher trophic level predators and fisheries. Overall, annual networks showed that phytoplankton-dominated grazing chains support a higher diversity of predators compared to chains originating from particulate organic matter (POM). The analysis of weighted networks accounting for seasonal variations in trophic interactions revealed that, during late summer, predators occupy more vulnerable positions than in spring. Changes in feeding preferences cause blue whiting to shift from mostly depending on grazing chains during spring to occupying a position along POM-dominated chains in late summer. These findings highlight the need for fisheries management strategies to prioritize the conservation of key trophic groups supplying energy to predators while considering seasonal shifts in the structure of the energy flow network.

There is a societal demand to restore drained boreal peatlands for purposes of improving water quality and biodiversity and lowering emissions of greenhouse gases. Restoration measures are costly and neither the effects of drainage nor restoration on biogeochemical processes in the peat, and in downstream environments are well understood. This study assesses how 60–100 years of drainage followed by 6–9 years of restored conditions have changed the physical and chemical peat properties in restored boreal peatlands. Eight pairs of restored and natural peatlands were sampled down to 50 cm (n = 3 for each site). Each of the 50 cm peat cores was sliced into 25 two-centimetre discs, generating high-resolution records of the dry bulk density (BD), organic matter content (OM), C- and N- content, δ13C, and δ15N. Peat from the restored sites showed significantly higher BD and lower C:N ratio and OM content than the reference sites. Furthermore, peat from restored peatlands was systematically depleted in δ13C, and the OM was enriched in C and N. Long-term drainage could cause increased peat decomposition, leaving altered physical and chemical peat properties. For example, the C content in OM increases as the residual peat is enriched in aromatic and aliphatic moieties following decomposition. For the same reason, degraded peat can be δ13C depleted. Interestingly, differences between the restored and pristine sites were mainly found at 20–50 cm depth. Given the low peat formation rates in nutrient-poor peatlands, the superficial 20 cm peat was potentially recovering from drainage even before restoration.

Given the rapid pace of global change, determining if our past understanding of the controls of ecosystem structure and function remains robust today is essential for managing and conserving ecosystems. Here, we revisit a foundational study that evaluated patterns and controls of aboveground net primary productivity (ANPP) across topographic gradients and in response to fire frequency treatments from 1975 to 1993 in tallgrass prairie (Konza Prairie). We replicated this 30-year-old study for a contemporary period (2005–2023) and found that overall patterns of ANPP across fire treatments and topographic gradients remained consistent. However, the magnitude of ANPP responses to fire increased substantially (> twofold) in lowlands, resulting in greater landscape-scale divergence in ANPP. Differences in temporal variability among topographic positions and fire regimes also increased (~ fourfold). Annual precipitation remained a primary determinant of ANPP, but atmospheric vapor pressure deficit (VPD) has emerged as a new driver in contemporary times. Furthermore, air temperature and deep soil moisture have now become significant controls of ANPP in unburned grassland. We conclude that despite myriad global changes, the primary controls of ANPP have not changed dramatically over three decades, but additional drivers have emerged (notably VPD), and the magnitude of responses to fire have been altered. Increased spatial variation in ANPP as well as interannual variability in ANPP differing more strongly among sites will be particularly challenging for managing this rare grassland. As temperatures and VPD continue to increase, additional revision to our understanding of the functioning of this and other ecosystems will likely be necessary.

U.S. employers to pay $100,000 for every new H-1B visa

The announcement comes months later than usual, leaving many would-be applicants stranded

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The University of Notre Dame is accepting applications for the next cohort of…

Area burned by wildfire has increased in western US forests over recent decades. However, high-severity fire—fire that kills all or most trees—is also an important metric of fire activity given its d...

After an unusual award process this year, applicants for next year are waiting for overdue guidelines

Wildfires are causing earlier snowmelt across the western US, and this effect would be exacerbated with projected warmer winters.

Staff from the EPA’s Office of Water were summoned to a town hall meeting this week and told to pause the publication of most research, pending a review.

Scholoarly publications by the initiative, Committee on Anthropogenic Greenhouse Gases and U.S. Climate: Evidence and Impacts, inconjunction with the National Academies of Science, Engineering, and Me...

Forest ecologist Mark Harmon has been exhaustively examining dead logs for 40 years, and he’s found a complex world few people see

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Susan Monarez, who clashed with the U.S. health secretary over vaccine policy, refuses to step down

Although half of Earth’s population resides in the wildland-urban interface, human exposure to wildland fires remains unquantified. We show that the population directly exposed to wildland fires incre...