The decline in species richness at higher latitudes is among the most fundamental patterns in ecology. Whether changes in species composition across space (beta-diversity) contribute to this gradient of overall local species richness (gamma diversity) remains hotly debated. Previous studies that failed to resolve the issue suffered from a well-known tendency for small samples in areas with high gamma-diversity to have inflated measures of beta-diversity. We provide here a novel analytical test, using beta-diversity metrics...
Population ecology and dynamics of a remnant natural population of European yew (Taxus baccata) in a lowland temperate forest – implications for use in reforestationDitte Arp Jensen & Jens-Christian Svenning
There is increasing focus on reforestation, but the efforts still often include limited subsets of species despite evidence that tree diversity promote biodiversity and ecological resilience. In addition to these benefits, greater inclusion of rare native species in reforestation efforts would also help conserve these species in an uncertain future. Here, we investigate the population ecology and dynamics of the only remaining historical population of the shade-adapted under- and mid-story tree European yew (Taxus baccata)...
Seasonal turnover in community composition of stream-associated macroinvertebrates inferred from freshwater environmental DNA metabarcodingMads Reinholdt Jensen, Eva Egelyng Sigsgaard, Sune Agersnap, Jes Jessen Rasmussen, Annette Baattrup-Pedersen, Peter Wiberg-Larsen & Philip Francis Thomsen
Macroinvertebrate communities are crucial for biodiversity monitoring and assessment of ecological status in stream ecosystems. However, traditional monitoring approaches require intensive sampling and rely on invasive morphological identifications that are time consuming and dependent on taxonomic expertise. Importantly, sampling is often only carried out once in a year, namely during late winter – spring, where most indicator taxa have larval stages in the streams. Hence, species with divergent phenology might not be detected. Here, we...
1. Vegetation memory describes the effect of antecedent environmental and ecological conditions on the present ecosystem state and has been proposed as an important proxy for vegetation resilience. In particular, strong vegetation-memory effects have been identified in dryland regions, but the factors underlying the spatial patterns of vegetation memory remain unknown. 2. We aim to map the components and drivers of vegetation memory in dryland regions using state-of-the-art climate-reanalysis data and refined approaches to identify...
Decreased precipitation in the late growing season weakens an ecosystem carbon sink in a semiarid grasslandZhongling Yang, Yueyue Wei, Guangya Fu, Rui Xiao, Ji Chen, Yaojun Zhang, Dong Wang & Junyong Li
1. Net ecosystem gas exchange (NEE), a balance between gross ecosystem primary productivity (GPP) and ecosystem respiration (ER), is an important indicator of terrestrial ecosystem CO2 sink or source. Increasing frequency of droughts during different periods of the growing season may affect terrestrial ecosystem carbon balance. However, detecting how drought timing controls ecosystem carbon processes is insufficiently explored because it is a challenge to accurately monitor and forecast drought dynamics. 2. In a five-year (2015-2019)...
Data from: Nationwide trends in incidence and mortality of stroke among younger and older adults in DenmarkNils Skajaa
Objective: To investigate the extent to which the incidence and mortality of a first-time stroke among younger and older adults changed from 2005 to 2018 in Denmark using nationwide registries. Methods: We used the Danish Stroke Registry and the Danish National Patient Registry to identify patients aged 18–49 years (younger adults) and those aged 50+ years (older adults) with a first-time ischemic stroke, intracerebral hemorrhage, or subarachnoid hemorrhage. We computed age-standardized incidence rates and 30-day...
Simulated ice thickness, supraglacial debris thickness and subglacial topography for Khumbu Glacier, Nepal, using the iSOSIA ice-flow model - VERSION 2.0Ann Rowan & David Egholm
Simulated ice thickness (ice, metres, 100 m grid spacing) and supraglacial debris thickness (debris, metres, 100 m grid spacing) for Khumbu Glacier, Nepal, produced using the iSOSIA ice-flow model presented in Rowan et al. (2021; Journal of Geophysical Research-Earth Surface). The model domains used for the entire glacier and active glacier simulations (metres above sea level, 100 m grid spacing), and the present-day ice thickness estimate (metres, 30 m grid spacing) used to create the...
Advances in bio-logging technology for wildlife monitoring have expanded our ability to study space use and behavior of many animal species at increasingly detailed scales. However, such data can be challenging to analyze due to autocorrelation of GPS positions. As a case study, we investigated spatiotemporal movements and habitat selection in the little owl (Athene noctua), a bird species that is declining in central Europe and verges on extinction in Denmark. We equipped 6 Danish...
Pollination sustains biodiversity and food security, but pollinators are threatened by habitat degradation, fragmentation and loss. Here we aimed to assess how remaining forests influence bee visits to flowers in an oil palm dominated landscape in Borneo, Indonesia. To do this, we observed pollinator visits to six plant species: four crops (Capsicum frutescens L. “chili”; Citrullus lanatus (Thunb.) Matsum. & Nakai “watermelon”; Solanum lycopersicum L. “tomato”; and Solanum melongena L. “eggplant”); one native plant Melastoma...
Large herbivores provide key ecosystem processes, but have experienced massive historical losses and are under intense pressure, leaving current ecosystems with dramatically simplified faunas relative to the long-term evolutionary norm. Hampered by a shifting baseline, natural levels of large-herbivore biomass are poorly understood and seldom targeted. Here, we present a collation of large-herbivore biomass data from published sources as well as personal communication. The data includes continent, ecosystem name, latitude, longitude, large herbivore biomass in...
University of Copenhagen19
Technical University of Denmark13
Wageningen University & Research11
University of Southern Denmark10
French National Centre for Scientific Research9
University of St Andrews9
University of Helsinki9
University of Gothenburg8