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  • Articles  (29)
  • Naturalis Biodiversity Center  (18)
  • Copernicus Publications  (11)
  • American Chemical Society
  • American Institute of Physics (AIP)
  • 2020-2024  (29)
  • 2022  (29)
  • 1
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    Governing change: a dynamical systems approach to understanding the stability of environmental governance (2022)
    Copernicus Publications
    In:  EPIC3Earth System Dynamics, Copernicus Publications, 13(4), pp. 1677-1688, ISSN: 2190-4979
    Details
    Publication Date: 2023-12-05
    Description: The ability to adapt to social and environmental change is an increasingly critical feature of environmental governance. However, an understanding of how specific features of governance systems influence how they respond to change is still limited. Here we focus on how system features like diversity, heterogeneity, and connectedness impact stability, which indicates a system's capacity to recover from perturbations. Through a framework that combines agent-based modeling with "generalized"dynamical systems modeling, we model the stability of thousands of governance structures consisting of groups of resource users and non-government organizations interacting strategically with the decision centers that mediate their access to a shared resource. Stabilizing factors include greater effort dedicated to venue shopping and a greater fraction of non-government organizations in the system. Destabilizing factors include greater heterogeneity among actors, a greater diversity of decision centers, and greater interdependence between actors. The results suggest that while complexity tends to be destabilizing, there are mitigating factors that may help balance adaptivity and stability in complex governance. This study demonstrates the potential in applying the insights of complex systems theory to managing complex and highly uncertain human-natural systems in the face of rapid social and environmental change.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    A global marine particle size distribution dataset obtained with the Underwater Vision Profiler 5 (2022)
    Copernicus Publications
    In:  EPIC3Earth System Science Data, Copernicus Publications, 14(9), pp. 4315-4337, ISSN: 1866-3508
    Details
    Publication Date: 2023-08-01
    Description: Marine particles of different nature are found throughout the global ocean. The term "marine particles"describes detritus aggregates and fecal pellets as well as bacterioplankton, phytoplankton, zooplankton and nekton. Here, we present a global particle size distribution dataset obtained with several Underwater Vision Profiler 5 (UVP5) camera systems. Overall, within the 64 μm to about 50 mm size range covered by the UVP5, detrital particles are the most abundant component of all marine particles; thus, measurements of the particle size distribution with the UVP5 can yield important information on detrital particle dynamics. During deployment, which is possible down to 6000 m depth, the UVP5 images a volume of about 1 L at a frequency of 6 to 20 Hz. Each image is segmented in real time, and size measurements of particles are automatically stored. All UVP5 units used to generate the dataset presented here were inter-calibrated using a UVP5 high-definition unit as reference. Our consistent particle size distribution dataset contains 8805 vertical profiles collected between 19 June 2008 and 23 November 2020. All major ocean basins, as well as the Mediterranean Sea and the Baltic Sea, were sampled. A total of 19 % of all profiles had a maximum sampling depth shallower than 200 dbar, 38 % sampled at least the upper 1000 dbar depth range and 11 % went down to at least 3000 dbar depth. First analysis of the particle size distribution dataset shows that particle abundance is found to be high at high latitudes and in coastal areas where surface productivity or continental inputs are elevated. The lowest values are found in the deep ocean and in the oceanic gyres. Our dataset should be valuable for more in-depth studies that focus on the analysis of regional, temporal and global patterns of particle size distribution and flux as well as for the development and adjustment of regional and global biogeochemical models. The marine particle size distribution dataset is available at 10.1594/PANGAEA.924375.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 3
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    Investigating stable oxygen and carbon isotopic variability in speleothem records over the last millennium using multiple isotope-enabled climate models (2022)
    Copernicus Publications
    In:  EPIC3Climate of the Past, Copernicus Publications, 18(7), pp. 1625-1654, ISSN: 1814-9324
    Details
    Publication Date: 2023-03-16
    Description: The incorporation of water isotopologues into the hydrology of general circulation models (GCMs) facilitates the comparison between modeled and measured proxy data in paleoclimate archives. However, the variability and drivers of measured and modeled water isotopologues, as well as the diversity of their representation in different models, are not well constrained. Improving our understanding of this variability in past and present climates will help to better constrain future climate change projections and decrease their range of uncertainty. Speleothems are a precisely datable terrestrial paleoclimate archives and provide well-preserved (semi-)continuous multivariate isotope time series in the lower latitudes and mid-latitudes and are therefore well suited to assess climate and isotope variability on decadal and longer timescales. However, the relationships of speleothem oxygen and carbon isotopes to climate variables are influenced by site-specific parameters, and their comparison to GCMs is not always straightforward. Here we compare speleothem oxygen and carbon isotopic signatures from the Speleothem Isotopes Synthesis and Analysis database version 2 (SISALv2) to the output of five different water-isotope-enabled GCMs (ECHAM5-wiso, GISSE2-R, iCESM, iHadCM3, and isoGSM) over the last millennium (850–1850 CE). We systematically evaluate differences and commonalities between the standardized model simulation outputs. The goal is to distinguish climatic drivers of variability for modeled isotopes and compare them to those of measured isotopes. We find strong regional differences in the oxygen isotope signatures between models that can partly be attributed to differences in modeled surface temperature. At low latitudes, precipitation amount is the dominant driver for stable water isotope variability; however, at cave locations the agreement between modeled temperature variability is higher than for precipitation variability. While modeled isotopic signatures at cave locations exhibited extreme events coinciding with changes in volcanic and solar forcing, such fingerprints are not apparent in the speleothem isotopes. This may be attributed to the lower temporal resolution of speleothem records compared to the events that are to be detected. Using spectral analysis, we can show that all models underestimate decadal and longer variability compared to speleothems (albeit to varying extents). We found that no model excels in all analyzed comparisons, although some perform better than the others in either mean or variability. Therefore, we advise a multi-model approach whenever comparing proxy data to modeled data. Considering karst and cave internal processes, e.g., through isotope-enabled karst models, may alter the variability in speleothem isotopes and play an important role in determining the most appropriate model. By exploring new ways of analyzing the relationship between the oxygen and carbon isotopes, their variability, and co-variability across timescales, we provide methods that may serve as a baseline for future studies with different models using, e.g., different isotopes, different climate archives, or different time periods.
    Repository Name: EPIC Alfred Wegener Institut
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  • 4
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    Strong increase in thawing of subsea permafrost in the 22nd century caused by anthropogenic climate change (2022)
    Copernicus Publications
    In:  EPIC3The Cryosphere, Copernicus Publications, 16(3), pp. 1057-1069, ISSN: 1994-0416
    Details
    Publication Date: 2024-05-07
    Description: Most earth system models (ESMs) neglect climate feedbacks arising from carbon release from thawing permafrost, especially from thawing of subsea permafrost (SSPF). To assess the fate of SSPF in the next 1000 years, we implemented SSPF into JSBACH, the land component of the Max Planck Institute Earth System Model (MPI-ESM). This is the first implementation of SSPF processes in an ESM component. We investigate three extended scenarios from the 6th phase of the Coupled Model Intercomparison Project (CMIP6). In the 21st century only small differences are found among the scenarios, but in the upper-end emission scenario SSP5-8.5 (shared socio-economic pathway), especially in the 22nd century, SSPF ice melting is more than 15 times faster than in the pre-industrial period. In this scenario about 35ĝ% of total SSPF volume and 34ĝ% of SSPF area are lost by the year 3000 due to climatic changes. In the more moderate scenarios, the melting rate maximally exceeds that of pre-industrial times by a factor of 4, and the climate change induced SSPF loss (volume and area) by the year 3000 does not exceed 14ĝ%. Our results suggest that the rate of melting of SSPF ice is related to the length of the local open-water season and thus that the easily observable sea ice concentration may be used as a proxy for the change in SSPF.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    A new species of Freycinetia Gaudich. (Pandanaceae; Freycinetoideae) with pseudopetioliform leaves from Arfak Mountains, Papua, Indonesia (2022)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 67 no. 2, pp. 156-158
    Details
    Publication Date: 2024-04-23
    Description: A new species of Freycinetia Gaudich. (Pandanaceae; Freycinetoidea) with obvious pseudopetiolate basal leaf from Mount Tombrok in the vicinity of theArfak Mountains, West Papua, Indonesian New Guinea, is newly described as Freycinetia pseudopetiolataA.P.Keim, K.Kartawinata & W.Sujarwo. The possession of the pseudopetiolate basal leaf form places this new species in the section Pseudopetiolosae; thus marking the first presence of the section for mainland New Guinea.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics ; Arfak ; Freycinetia ; New Guinea ; Pandanaceae ; Papua ; Pseudopetiolosae
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 6
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    Genetic population structure of the agaric Blastosporella zonata (Lyophyllaceae) reveals cryptic species and different roles for sexual and asexual spores in dispersal (2022)
    Naturalis Biodiversity Center
    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi vol. 49, pp. 195-200
    Details
    Publication Date: 2024-04-23
    Description: Blastosporella zonata is one of the few basidiomycete fungi that produce asexual spores (conidia) on the mushroom. The role of these conidia in the fungal lifecycle is not known. We tested whether conidia are being utilized in local dispersal by looking for signatures of clonality in 21 samples from three localities separated by about three kilometres in Murillo, Colombia. To identify clonally related individuals, we sequenced three polymorphic markers at two unlinked loci (nuclear rRNA: ITS and LSU, and TEF1α) for all collections plus three herbarium samples. We identified two sets of clonally related individuals growing closely together in one of the three localities, and only one pair shared between localities. In all three localities we observed multiple non-clonally related dikaryons showing that sexual reproduction is also important. Our results indicate that the conidia on the mushroom are primarily important for local dispersal. Unexpectedly, our results also indicate two reproductively isolated populations, possibly representing cryptic biological species.
    Keywords: Ecology ; Evolution ; Behavior and Systematics ; Blastosporella ; Lyophyllaceae ; basidiomycetes ; clonality ; conidia ; cryptic species ; genetic population structure ; insect-association ; population genetics
    Repository Name: National Museum of Natural History, Netherlands
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  • 7
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    A new species of Freycinetia Gaudich. (Pandanaceae; Freycinetoideae) from the island of Halmahera, the Moluccas, Indonesia (2022)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 67 no. 2, pp. 129-131
    Details
    Publication Date: 2024-03-24
    Description: A new species of Freycinetia Gaudich. (Pandanaceae; Freycinetoideae) with conspicuous ellipsoid leaves and spiny auricles from the island of Halmahera in the Moluccan Archipelago is here newly described as F. halmaherensis A.P.Keim, W.Sujarwo & Sahroni. A full description of the new species and a key to the species of Freycinetia in the Moluccas are provided.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics ; Freycinetia ; Freycinetoideae ; Halmahera ; Moluccas ; Pandanaceae
    Repository Name: National Museum of Natural History, Netherlands
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  • 8
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    Taxonomic studies of Araceae in Myanmar IV: A new species, a new record and a new synonym for the genus Amorphophallus (2022)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 67 no. 2, pp. 123-128
    Details
    Publication Date: 2024-03-24
    Description: Amorphophallus wasa Naive, K.Z.Hein & Hett., is described and illustrated as a species new to science from the Sagaing Region, Myanmar. It is morphologically similar to A. saraburiensis Gagnep., but can be easily distinguished by its unilocular ovaries and lack of staminodes between pistillate and staminate zones. A detailed description, colour plates, phenology, distribution map, provisional conservation status and a key to the Amorphophallus species from Myanmar are provided. In addition, A. elatus Hook.f. is reported as a newly recorded species for Myanmar, and the name A. corrugatus N.E.Br. is newly synonymized under A. kachinensis Engl. & Gehrm.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics ; Aroideae ; biodiversity ; Burma ; plant taxonomy ; Southeast Asian Flora
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 9
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    Three new species and several typifications of Breynia (Phyllanthaceae) from Malesia (2022)
    Naturalis Biodiversity Center
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 67 no. 2, pp. 132-138
    Details
    Publication Date: 2024-03-24
    Description: Three new species of Breynia are described for Malesia, B. longistyla from Borneo, B. papillosa from New Guinea, and B. suborbicularis from Sulawesi. They are primarily distinguished by characters of indumentum, leaves, and styles. Ten lectotypes and one neotype are designated, and one new synonym is proposed.
    Keywords: Plant Science ; Ecology ; Evolution ; Behavior and Systematics ; Breynia ; lectotype ; Malesia ; neotype ; Phyllanthaceae
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
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    Phylogeny and taxonomy of Circinotrichum, Gyrothrix, Vermiculariopsiella and other setose hyphomycetes (2022)
    Naturalis Biodiversity Center
    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi vol. 49, pp. 99-135
    Details
    Publication Date: 2024-03-24
    Description: Circinotrichum, Gyrothrix and Vermiculariopsiella represent a complex of dematiaceous, setose, saprobic hyphomycetes that are commonly collected on plant litters in tropical, subtropical to temperate climates. Multi-locus analysis (ITS, LSU, rpb2) and morphological studies revealed that Gyrothrix and Circinotrichum are polyphyletic and species belong to 10 genera grouping in three different clades within Xylariales, named Coniocessiaceae (Circinotrichum and Pirozynskiomyces gen. nov.), Microdochiaceae (Selenodriella and the resurrected genus Peglionia) and the new family Gyrothricaceae (Gyrothrix, Xenoanthostomella, Neogyrothrix gen. nov., Pseudocircinotrichum gen. nov., and Pseudoceratocladium gen. nov.). Vermiculariopsiella (Vermiculariopsiellales, Vermiculariopsiellaceae) is emended for species with setose sporodochia with simple setae (V. dichapetali, V. eucalypticola, V. immersa, V. pini, V. spiralis, V. australiensis sp. nov.) while Vermiculariopsis is resurrected and includes setose fungi with branched setae (Vs. dunni, Vs. eucalypti, Vs. eucalyptigena, Vs. lauracearum, Vs. microsperma, Vs. pediculata and Vs. castanedae sp. nov.).
    Keywords: Ecology ; Evolution ; Behavior and Systematics ; Microdochiaceae ; new taxa ; Selenodriella ; Sordariomycetes ; Vermiculariopsiellales ; Xylariales
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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