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AbstractThe matrix is the matrix of additive genetic variances and covariances for a vector of phenotypes. Here we apply the classical theory for the balance among selection, genetic drift, and mutations to find the contributions to from each locus for populations at stasis. The fitness is approximated by a linear function of phenotypes, with coefficients affected by environmental fluctuations.
View Article and Find Full Text PDFFirst fossil species of family Hyidae (Arachnida: Pseudoscorpiones) confirms 99 million years of ecological stasis in a Gondwanan lineage.
PeerJ
July 2024
Section Arachnology, Centre for Taxonomy and Morphology, Museum of Nature Hamburg-Zoology, Leibniz Institute for the Analysis of Biodiversity Change, Hamburg, Germany.
Burmese amber preserves a diverse assemblage of Cretaceous arachnids, and among pseudoscorpions (Arachnida: Pseudoscorpiones), ten species in five families have already been named. Here, we describe a new fossil species from Burmese amber in the pseudoscorpion family Hyidae, providing detailed measurements, photographs and 3D-models from synchrotron scanning. Based on morphology, the new fossil, sp.
View Article and Find Full Text PDFCMIP6 ESMs overestimate greening and the photosynthesis trends in Dryland East Asia.
Sci Total Environ
August 2024
School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing, China.
The Dryland East Asia (DEA) is one of the largest inland arid regions, and vegetation is very sensitive to climate change. The complex environment in DEA with defects of modeling construction make it difficult to simulate and predict changes in vegetation structure and productivity. Here, we use the emergent constraint (EC) method to constrain the future interannual leaf area index (LAI) and gross primary productivity (GPP) trends in DEA, under four scenarios of the latest Sixth Coupled Model Intercomparison Project (CMIP6) model ensemble.
View Article and Find Full Text PDFCircumtropical distribution and cryptic species of the meiofaunal enteropneust Meioglossus (Harrimaniidae, Hemichordata).
Sci Rep
April 2024
Marine Biological Section, Department of Biology, University of Copenhagen, Universitetsparken 4, DK-2100, Copenhagen, Denmark.
Hemichordata has always played a central role in evolutionary studies of Chordata due to their close phylogenetic affinity and shared morphological characteristics. Hemichordates had no meiofaunal representatives until the surprising discovery of a microscopic, paedomorphic enteropneust Meioglossus psammophilus (Harrimaniidae, Hemichordata) from the Caribbean in 2012. No additional species have been described since, questioning the broader distribution and significance of this genus.
View Article and Find Full Text PDFFreshwater genome-reduced bacteria exhibit pervasive episodes of adaptive stasis.
Nat Commun
April 2024
Limnological Station, Department of Plant and Microbial Biology, University of Zurich, Kilchberg, Switzerland.
The emergence of bacterial species is rooted in their inherent potential for continuous evolution and adaptation to an ever-changing ecological landscape. The adaptive capacity of most species frequently resides within the repertoire of genes encoding the secreted proteome (SP), as it serves as a primary interface used to regulate survival/reproduction strategies. Here, by applying evolutionary genomics approaches to metagenomics data, we show that abundant freshwater bacteria exhibit biphasic adaptation states linked to the eco-evolutionary processes governing their genome sizes.
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