1,720,978 research outputs found
GuadalShiftR: exploring tipping points, catastrophic bifurcations and alternative stable states in the Guadalquivir marshes
No full text<p>This is the Zenodo hosting of the project <a href="https://github.com/palmaraz/GuadalShiftR" target="_blank" rel="noopener">GuadalShiftR</a>. The <a href="https://doi.org/10.1016/j.biocon.2024.110466" target="_blank" rel="noopener">paper</a> associated to the project is published in the journal <a href="https://www.sciencedirect.com/journal/biological-conservation/special-issue/10DNPT6S9QV" target="_blank" rel="noopener">Biological Conservation</a>. This folder is a <a href="https://workflowr.github.io/workflowr/" target="_blank" rel="noopener">workflowr</a> project, and contains the datasets and files needed to reproduce all the results of the project, and compile the manuscript of the associated paper. The major goal of the project is to explore the existence of tipping points, a catastrophic bifurcation and alternative stable states throughout a 36-year period of wintering waterfowl community dynamics in the Guadalquivir marshes, SW Spain, induced by the explosion of Mt. Pinatubo, Philippines, in 1991.</p>
<p>See the GitHub <a href="https://github.com/palmaraz/GuadalShiftR" target="_blank" rel="noopener">GuadalShiftR</a> hosting of the project for further details, and for the most recent versions between releases.</p>
<p><a href="https://github.com/palmaraz/GuadalShiftR#corrections" target="_blank" rel="noopener"><code><strong>NOTE</strong></code></a>: Look at the most recent versions of the project in the <a href="https://github.com/palmaraz/GuadalShiftR" target="_blank" rel="noopener">GitHub</a> hosting for the latest project version, and for the up-dated <a href="https://github.com/palmaraz/GuadalShiftR#corrections" target="_blank" rel="noopener">CORRECTIONS</a> of the code and the published paper. When significant corrections accumulate subsequent <a href="https://github.com/palmaraz/GuadalShiftR/releases" target="_blank" rel="noopener">releases</a> will be published, and will be available in this repository.</p>
<p><strong>Full Changelog</strong>: <a href="https://github.com/palmaraz/GuadalShiftR/commits/v1.0.0" target="_blank" rel="noopener">https://github.com/palmaraz/GuadalShiftR/commits/v1.0.0</a></p>
Climate variability induces changes in phytoplankton phenology across Spanish marine ecoregions
No full text[Data availability]
All data used in this study are publicly available online. NASA Ocean Color provided Aqua-MODIS-OC3M-derived (L3) surface chl-a concentrations (https://oceandata.sci.gsfc.nasa.gov/l3/; last accessed: March 2025). E.U. Copernicus Marine Service made available L4 satellite-derived chl-a concentrations in sea water (https://doi.org/10.48670/moi-00289; last accessed: March 2025); L4 satellite-derived SST, from the European North West Shelf/Iberia Biscay Irish Seas – (https://doi.org/10.48670/moi-00153; last accessed: March 2025), and from the Global Ocean OSTIA (https://doi.org/10.48670/moi-00168; last accessed: March 2025); and GLORYS12V1-derived MLD (https://doi.org/10.48670/moi-00021; last accessed: March 2025). E.U. Copernicus Climate Change Service, implemented by ECMWF, provided CERRA 10 m-wind speed data (https://doi.org/10.24381/cds.622a565a; last accessed: March 2025). British Oceanographic Data Centre supplied ocean bottom depths through GEBCO_2023 Grid (https://www.gebco.net/data_and_products/gridded_bathymetry_data/gebco_2023/; last accessed: March 2025). All codes developed in Python 3.12.8 for data analyses, along with all phenology and CCM/GCCM output data, are freely available at https://github.com/ManuFBarba/Estrategias_Marinas and at https://doi.org/10.20350/digitalCSIC/17348 (Fernández-Barba et al., 2025).Climate change is altering the global phenology of phytoplankton (i.e., the timing and magnitude of blooms) by influencing upper-ocean physical and biogeochemical conditions. However, less is known about regional phytoplankton responses to short-term climate extremes, despite their increasing severity and profound ecological impacts. In this study, we broadly investigate spatiotemporal changes in phytoplankton phenology across Spanish marine ecoregions using 26 years of high-resolution L4 chlorophyll-a data from Copernicus’ multisatellite observations. We identify a regionally dependent trend toward less intense, longer-lasting coastal phytoplankton blooms that initiate and terminate earlier, accompanied by a decline in seasonality over the past decade. Notably, we find greater variability in the reproducibility of phytoplankton seasonal cycles during years of pronounced climatic instability. Further, using cutting-edge analytical methods, we empirically reveal causal, nonlinear relationships between dynamical changes in phytoplankton phenology and thermal (i.e., marine heatwaves) and wind-speed (i.e., Windiness) extremes. Our findings improve predictive skill for phytoplankton responses to transient climate events, providing evidence of their influence in shaping phytoplankton dynamics; insights particularly relevant for anticipating ecological and socioeconomic impacts.This research was funded by the European Union –NextGeneration EU– as part of the MITECO program for the Spanish Recovery, Transformation and Resilience Plan (Recovery and Resilience Facility of the European Union established by the Regulation (EU) 2020/2094), and was entrusted to CSIC, AZTI, SOCIB, and the Universities of Vigo and Cadiz; and the OAPN (Observatorio TIAMAT, REF: 2715/2021). This work was also supported by funding from PIE202330E222 and IMOVE24102.Peer reviewe
Phytoplankton Bloom Phenology Metrics and Causality Analyses Across Spanish Marine Ecoregions Under Climate Variability
No full textFuentes de trabajo:
https://data.marine.copernicus.eu/products; https://github.com/SugiharaLab/pyEDM; https://www.science.org/doi/10.1126/science.1227079; https://doi.org/10.1038/s41467-023-41619-6Daily Surface seawater chlorophyll-a concentration data (1998–2023) were obtained from the multi-satellite Atlantic Ocean Colour product (Copernicus-GlobColour), with a spatial resolution of 1 km. Based on these data, annual main phytoplankton bloom was identified using an adaptive threshold method (see Racault et al., 2012; Ferreira et al., 2021), which involved the following criteria: (i) a 3-week centered running mean of L4 chlorophyll-a must exceed a threshold of 5% above the annual median chlorophyll-a concentration, (ii) for at least 15 consecutive days, and (iii) with data gaps of fewer than 3 days. The phenological metrics included in this dataset were used to characterize both the main bloom and phytoplankton seasonality (see details in Fernández-Barba et al., 2025). Furthermore, to explore causal relationships between phytoplankton phenology and physical variables indicative of climate variability (i.e., marine heatwaves and high-speed wind events), Empirical Dynamic Modeling (EDM)—a cutting-edge approach grounded in Takens’ theorem (Takens, 1981)—was applied. Specifically, the Convergent Cross Mapping (CCM) method, as defined by Sugihara et al. (2012), was employed. In addition, spatiotemporal coherence was assessed using Geographical CCM (GCCM), as developed by Gao et al. (2023).This repository contains the complete dataset and computational workflows supporting the study on climate-driven shifts in phytoplankton bloom phenology across Spanish marine ecoregions. It includes derived phenological metrics (i.e., bloom maximum, amplitude, initiation, termination, peak timing, frequency, duration, cumulative chlorophyll-a, and seasonal cycle reproducibility) based on 26 years of Copernicus L4 chlorophyll-a multi-satellite observations at 1 km horizontal resolution. Additionally, it hosts the outputs of spatiotemporal causality analyses through (Geographical) Convergent Cross Mapping, which identify nonlinear interactions between phyotplankton bloom dynamics and climate
extremes such as marine heatwaves and high-speed wind events.
The repository provides fully reproducible code for data preprocessing, phenological indices extraction, causal inference modeling, and figure representation for both the main manuscript and supplementary materials. These resources enable deeper exploration of
the mechanistic links between climate variability and ecosystem responses in coastal marine systems. This work facilitates future research on ecological forecasting under transient climatic perturbations and contributes to the understanding of regional-scale biophysical coupling in the ocean.This research was funded by the European Union –NextGeneration EU– as part of the MITECO program for the Spanish Recovery, Transformation and Resilience Plan (Recovery and Resilience Facility of the European Union established by the Regulation (EU) 2020/2094), and was entrusted to CSIC, AZTI, SOCIB, and the universities of Vigo and Cadiz.Peer reviewe
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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