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Despite the importance of species discovery, the processes including collecting, recognizing, and describing new species are poorly understood. Data are presented for flowering plants, measuring quantitatively the lag between the date a specimen of a new species was collected for the first time and when it was subsequently described and published. The data from our sample of new species published between 1970 and 2010 show that only 16% were described within five years of being collected for the first time. The description of the remaining 84% involved much older specimens, with nearly one-quarter of new species descriptions involving specimens > 50 y old. Extrapolation of these results suggest that, of the estimated 70,000 species still to be described, more than half already have been collected and are stored in herbaria. Effort, funding, and research focus should, therefore, be directed as much to examining extant herbarium material as collecting new material in the field.

Societal Impact Statement Given the current unprecedented concerns for global biodiversity loss, it is critical to identify best practices for describing new species more efficiently so we can complete the inventory of the Neotropical flora and implement appropriate conservation strategies in a timely manner. This study aims to answer the question of how long it takes to describe a new species of tree in the Neotropics by calculating the time elapsed from collection of the first specimen to the publication of a new species. It demonstrates that enhancing international collaboration and promoting taxonomy training may be the most efficient ways to accelerate species descriptions. Summary One of the main aspects of taxonomic research is the description of new species. Identifying how to describe new species more efficiently is key to completing the inventory of the Neotropical flora in an era of massive biodiversity loss. Here, we calculate the interval between first specimen collection and publication of new species for a group of 2123 Neotropical trees, and discuss the historical context surrounding specimen collection and new species publication events. Our results reveal that on average, it takes almost 16 years from specimen collection to publication of a new Neotropical tree species, which is considerably shorter than previous estimates for other tropical groups. Peru had the longest average time lags by country, while Haiti had the shortest. The average time lags increased until the early 1900s, when a decrease was observed, with the shortest lags between 1941 and 1960. We found that the majority of the species described more rapidly are from plants collected by a field botanist and described by a herbarium‐based researcher as part of ad hoc collaboration, and the ones collected and described by the same researcher. We demonstrate how political instability and conflict can delay or impede the completion of taxonomic research initiatives in the region. We argue that enhancing international collaboration and training opportunities in Latin American countries, as well as ensuring safe plant collection campaigns, are critical to complete the inventory of the Neotropical flora. Dada la inédita preocupación por la actual pérdida global de biodiversidad, resulta importante identificar las mejores estrategias para describir nuevas especies de manera más eficiente, completar el inventario de la flora Neotropical e implementar a tiempo estrategias de conservación apropiadas. Este estudio pretende responder la pregunta de cuánto tiempo toma describir una nueva especie en el Neotrópico estimando el lapso que transcurre entre la colección del primer espécimen y la publicación de una nueva especie. Demostramos que incrementar la colaboración internacional y promover el entrenamiento en taxonomía pueden ser las estrategias más eficientes para acelerar la descripción de especies. Given the current unprecedented concerns for global biodiversity loss, it is critical to identify best practices for describing new species more efficiently so we can complete the inventory of the Neotropical flora and implement appropriate conservation strategies in a timely manner. This study aims to answer the question of how long it takes to describe a new species of tree in the Neotropics by calculating the time elapsed from collection of the first specimen to the publication of a new species. It demonstrates that enhancing international collaboration and promoting taxonomy training may be the most efficient ways to accelerate species descriptions.

Recent debates on the number of plant species in the vast lowland rain forests of the Amazon have been based largely on model estimates, neglecting published checklists based on verified voucher data. Here we collate taxonomically verified checklists to present a list of seed plant species from lowland Amazon rain forests. Our list comprises 14,003 species, of which 6,727 are trees. These figures are similar to estimates derived from nonparametric ecological models, but they contrast strongly with predictions of much higher tree diversity derived from parametric models. Based on the known proportion of tree species in neotropical lowland rain forest communities as measured in complete plot censuses, and on overall estimates of seed plant diversity in Brazil and in the neotropics in general, it is more likely that tree diversity in the Amazon is closer to the lower estimates derived from nonparametric models. Much remains unknown about Amazonian plant diversity, but this taxonomically verified dataset provides a valid starting point for macroecological and evolutionary studies aimed at understanding the origin, evolution, and ecology of the exceptional biodiversity of Amazonian forests.

Dada la inédita preocupación por la actual pérdida global de biodiversidad, resulta importante identificar las mejores estrategias para describir nuevas especies de manera más eficiente, completar el inventario de la flora Neotropical e implementar a tiempo estrategias de conservación apropiadas. Este estudio pretende responder la pregunta de cuánto tiempo toma describir una nueva especie en el Neotrópico estimando el lapso que transcurre entre la colección del primer espécimen y la publicación de una nueva especie. Demostramos que incrementar la colaboración internacional y promover el entrenamiento en taxonomía pueden ser las estrategias más eficientes para acelerar la descripción de especies.

One of the main aspects of taxonomic research is the description of new species. Identifying how to describe new species more efficiently is key to completing the inventory of the Neotropical flora in an era of massive biodiversity loss. Here we calculate the interval between first specimen collection and new species publication for a group of 2126 Neotropical trees, and discuss the historical context surrounding specimen collection and new species publication events. Our results reveal that on average, it takes almost 16 years from specimen collection to publication of a new Neotropical tree species, which is considerably shorter than previous estimates for other tropical groups. The central Andes is the region that had the longest average time lags, while the Choco had the shortest. Peru had the longest average time lags by country, while Haiti had the shortest. The average time lags increased until the early 1900s, when a decrease was observed, with the shortest lags between 1941 to 1960. We found that the majority of the species described more rapidly are from plants collected and described by the same researcher. We demonstrate how political instability and conflict can delay or impede the completion of research initiatives in the region. We argue that enhancing international collaboration and training opportunities in Latin American countries, as well as ensuring safe plant collection campaigns, are critical to complete the inventory of the Neotropical flora. This study aims to answer the question of how long it takes to describe a new species of tree in the Neotropics by calculating the time elapsed from collection of the first specimen to the publication of a new species. Given the current unprecedented concerns for global biodiversity loss, it is critical to identify best practices for describing new species more efficiently so we can complete the inventory of the Neotropical flora and implement appropriate conservation strategies in a timely manner.

Trees structure the Earth’s most biodiverse ecosystem, tropical forests. The vast number of tree species presents a formidable challenge to understanding these forests, including their response to environmental change, as very little is known about most tropical tree species. A focus on the common species may circumvent this challenge. Here we investigate abundance patterns of common tree species using inventory data on 1,003,805 trees with trunk diameters of at least 10 cm across 1,568 locations 1 – 6 in closed-canopy, structurally intact old-growth tropical forests in Africa, Amazonia and Southeast Asia. We estimate that 2.2%, 2.2% and 2.3% of species comprise 50% of the tropical trees in these regions, respectively. Extrapolating across all closed-canopy tropical forests, we estimate that just 1,053 species comprise half of Earth’s 800 billion tropical trees with trunk diameters of at least 10 cm. Despite differing biogeographic, climatic and anthropogenic histories 7 , we find notably consistent patterns of common species and species abundance distributions across the continents. This suggests that fundamental mechanisms of tree community assembly may apply to all tropical forests. Resampling analyses show that the most common species are likely to belong to a manageable list of known species, enabling targeted efforts to understand their ecology. Although they do not detract from the importance of rare species, our results open new opportunities to understand the world’s most diverse forests, including modelling their response to environmental change, by focusing on the common species that constitute the majority of their trees. Inventory data from more than 1 million trees across African, Amazonian and Southeast Asian tropical forests suggests that, despite their high diversity, just 1,053 species, representing a consistent ~2.2% of tropical tree species in each region, constitute half of Earth’s 800 billion tropical trees.

IntroductionMillions of patients receive general anaesthesia every year with either propofol total intravenous anaesthesia (TIVA) or inhaled volatile anaesthesia (INVA). It is currently unknown which of these techniques is superior in relation to patient experience, safety and clinical outcomes. The primary aims of this trial are to determine (1) whether patients undergoing (a) major inpatient surgery, (b) minor inpatient surgery or (c) outpatient surgery have a superior quality of recovery after INVA or TIVA and (2) whether TIVA confers no more than a small (0.2%) increased risk of definite intraoperative awareness than INVA.Methods and analysisThis protocol was co-created by a diverse team, including patient partners with personal experience of TIVA or INVA. The design is a 13 000-patient, multicentre, patient-blinded, randomised, comparative effectiveness trial. Patients 18 years of age or older, undergoing elective non-cardiac surgery requiring general anaesthesia with a tracheal tube or laryngeal mask airway will be eligible. Patients will be randomised 1:1 to one of two anaesthetic approaches, TIVA or INVA, using minimisation. The primary effectiveness endpoints are Quality of Recovery-15 (QOR-15) score on postoperative day (POD) 1 in patients undergoing (1) major inpatient surgery, (2) minor inpatient surgery or (3) outpatient surgery, and the primary safety endpoint is the incidence of unintended definite intraoperative awareness with recall in all patients, assessed on POD1 or POD30. Secondary endpoints include QOR-15 score on POD0, POD2 and POD7; incidence of delirium on POD0 and POD1; functional status on POD30 and POD90; health-related quality of life on POD30, POD90, POD180 and POD365; days alive and at home at POD30; patient satisfaction with anaesthesia at POD2; respiratory failure on POD0; kidney injury on POD7; all-cause mortality at POD30 and POD90; intraoperative hypotension; moderate-to-severe intraoperative movement; unplanned hospital admission after outpatient surgery in a free-standing ambulatory surgery centre setting; propofol-related infusion syndrome and malignant hyperthermia.Ethics and disseminationThis study is approved by the ethics board at Washington University, serving as the single Institutional Review Board for all participating sites. Recruitment began in September 2023. Dissemination plans include presentations at scientific conferences, scientific publications, internet-based educational materials and mass media.Trial registration numberNCT05991453.

A primer on understanding the influence of specific genetic variants on cognition, affective regulation, personality, and central nervous system disorders. It has long been known that aspects of behavior run in families; studies show that characteristics related to cognition, temperament, and all major psychiatric disorders are heritable. This volume offers a primer on understanding the genetic mechanisms of such inherited traits. It proposes a set of tools—a conceptual basis—for critically evaluating recent studies and offers a survey of results from the latest research in the emerging fields of cognitive genetics and imaging genetics. The chapters emphasize fundamental issues regarding the design of experiments, the use of bioinformatic tools, the integration of data from different levels of analysis, and the validity of findings, arguing that associations between genes and cognitive processes must be replicable and placed in a neurobiological context for validation. The Genetics of Cognitive Neuroscience aims to give the reader a working understanding of the influence of specific genetic variants on cognition, affective regulation, personality, and central nervous system disorders. With its emphasis on general methodological points, it will remain a valuable resource in a fast-evolving field. Contributors Kristin L. Bigos, Katherine E. Burdick, Jingshan Chen, Aiden Corvin, Jeffrey L. Cummings, Ian J. Deary, Gary Donahoe, Eco J. C. de Geus, Jin Fan, Erika E. Forbes, John Fossella, Terry E. Goldberg, Ahmad R. Hariri, Lucas Kempf, Anil K. Malhotra, Venkata S. Mattay, Lauren M. McGrath. Kristin K. Nicodemus, Francesco Papaleo, Bruce F. Pennington, Michael I. Posner, Danielle Posthuma, John M. Ringman, Shelley D. Smith, Daniel R. Weinberger, Fengyu Zhang

A model of pneumonia due to Pseudomonas aeruginosa in leukopenic dogs was developed. In a controlled trial, transfusions of granulocytes, plus gentamicin, were significantly more effective in treatment of this infection than was gentamicin therapy alone.

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