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8 results for “hyperdominants”
Admixture may be extensive among hyperdominant Amazon rainforest tree species
<p><span><span><span><span><span><span><span><span><span><span><span>Admixture is a mechanism by which species of long-lived plants may acquire novel alleles. However, the potential role of admixture in the origin and maintenance of tropical plant diversity is unclear. We ask whether admixture occurs in an ecologically important clade of Eschweilera (Parvifolia clade, Lecythidaceae), which includes some of the most widespread and abundant tree species in Amazonian forests.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>Using target capture sequencing, we conducted a detailed phylogenomic investigation of 33 species in the Parvifolia clade and investigated specific hypotheses of admixture within a robust phylogenetic framework. We assembled target loci from raw sequence reads, conducted tree-based paralog trimming, and estimated species trees using maximum likelihood approaches. In addition, we called single nucleotide polymorphisms for members of the Parvifolia clade and used a Bayesian clustering approach to estimate the ancestry of individuals. We distinguished between population structure and evidence of admixture using a test based on rooted gene trees. We also investigated overlap in geographical range, phenology, and morphology of species, including those we found to admix.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>We found strong evidence of admixture among three ecologically dominant species, E. coriacea, E. wachenheimii and E. parviflora, but a lack of evidence for admixture among other lineages. Accepted species were largely distinguishable from one another, as was geographic structure within species.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>We show that hybridization may play a role in the evolution of the most widespread and ecologically variable Amazonian tree species. While admixture occurs among some species of Eschweilera, it has not led to widespread erosion of most species' genetic or morphological identities. Therefore, current morphological based species circumscriptions appear to provide a useful characterization of the clade's lineage diversity.</span></span></span></span></span></span></span></span></span></span></span></p>
Admixture may be extensive among hyperdominant Amazon rainforest tree species
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Fig. 3 in Leaf isoprene and monoterpene emission distribution across hyperdominant tree genera in the Amazon basin
Fig. 3. Example light (dark blue trace) response curves of leaf photosynthesis (black trace), isoprene emissions (green trace) and monoterpene emissions from an individual in each of the 5 abundant genera including (a) Eschweilera sp., (b) Inga edulis, (c) Protium hebetatum, (d) Pouteria durlandii, (e) Licania oblongifolia. Also shown is an example light response curve from the monoterpene emitting species (f) Pouteria anomala. The dotted line represents a net flux of zero on the photosynthesis axis with negative values in the dark due to leaf respiration. Note that (c) Protium hebetatum is both an isoprene and monoterpene emitter while (f) Pouteria anomala is a monoterpene only emitter.
Fig. 2 in Leaf isoprene and monoterpene emission distribution across hyperdominant tree genera in the Amazon basin
Fig. 2. Percentages of hyperdominant species with leaf isoprenoid emissions for the abundant genera Protium, Licania, Inga, Eschweilera and Pouteria in the Amazon forest. n is the number of species sampled for each genus.
Fig. 1 in Leaf isoprene and monoterpene emission distribution across hyperdominant tree genera in the Amazon basin
Fig. 1. Images of the coupled leaf portable photosynthesis (Li6400XT) and volatile emission autosampler (Less-P) system developed in this study for the combined analysis of net photosynthesis and volatile isoprenoid emissions at remote field site locations in the Amazon forest.
Fig. 4 in Leaf isoprene and monoterpene emission distribution across hyperdominant tree genera in the Amazon basin
Fig. 4. Maximum leaf isoprenoid emissions from the light response curve data showing (a) maximum isoprenoid emissions for species where emissions were detected and (b) a histogram representing the distribution of maximum leaf isoprenoid emissions.
Data from: Holocene variability of an Amazonian hyperdominant
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Hyperdominance and habitat composition drive reef fish foraging on Atlantic oceanic islands
<p>Spatial and temporal patterns of benthic community structure play a crucial role in shaping reef habitats and have a direct impact on fish foraging dynamics, alongside density-dependence effects on the whole community. In isolated oceanic islands, the relatively low fish species richness often leads to the hyperdominance of a few species and a general reduced trophic redundancy. However, the influence of benthic habitat features and hyperdominant species on foraging selection in oceanic islands has been largely overlooked. This study aimed to investigate, using Remote Underwater Videos (RUVs), whether reef fishes consistently forage on specific habitats across five different oceanic islands in the Atlantic Ocean, especially focusing on the importance of the role of hyperdominant species. We analysed 295 RUVs, within 2m2 areas (3-15 m deep), totalling 49 hours of video. Photoquadrats were utilised to gauge benthic group coverage in the same habitats. Our results revealed five prevalent habitats and six fish trophic groups interacting with reef benthos. The intensity of feeding pressure varied across islands, depending on the diversity of habitats. Herbivores and omnivores exhibited the highest feeding pressure, with omnivores foraging on crustose coralline algae and macroalgae habitats, while herbivores primarily fed on habitats dominated by the epilithic algal matrix. Hyperdominant species forage in multiple habitats, indicating a comparatively high degree of dietary plasticity. Our findings also demonstrated that fish feeding pressure is influenced by both habitat features and fish biomass. Therefore, our study can provide valuable insights for prioritising the management of key species in isolated oceanic reefs.</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.