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83 results for “invasive grasses”
Precipitation and invasive winter annual grass data for the Great Plains
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Data from: Intraspecific variation among clones of a naïve rare grass affects competition with an invasive forb
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Data from: Interactive effects of a non-native invasive grass Microstegium vimineum and herbivore exclusion on experimental tree regeneration under differing forest management
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Data from: With a little help from my friends – Physiological integration facilitates invasion of wetland grass Elymus athericus into flooded soils
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Data from: Fire season and drought influence fire effects on invasive grasses: A meta-analysis
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Data from: Aboveground versus soil-mediated effects of an invasive grass on fire-dependent forbs in an oak woodland
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Seasonal pulse dynamics of CO2 and N2O, but not NOx, are modulated by exotic grass invasion in California coastal sage scrub
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Invasion promotes invasion: facilitation of C3 perennial grass dominance
<p><b>1.</b> In the southern Great Plains (SGP) of the USA, encroachment of the native invasive woody legume, honey mesquite (<i>Prosopis glandulosa </i>Torr.), has caused a decline in C<sub>4</sub> mid-grass abundance. <i>Prosopis glandulosa</i> invasion has also facilitated growth of the C<sub>3</sub> mid-grass species, Texas wintergrass (<i>Nassella leucotricha </i>[Trin & Rupr.] Pohl) initially beneath its canopy but extending to interspaces between <i>P. glandulosa</i> as stand density increases. Little is known about the stability of the <i>Prosopis</i>/<i>Nassella</i> association, or C<sub>4</sub> grass recovery following <i>P. glandulosa</i> disturbance.</p> <p><b>2.</b> We quantified C<sub>3</sub> and C<sub>4</sub> grass production in interspaces, and basal cover in interspaces and <i>P. glandulosa</i> subcanopy microsites for 9 years following <i>P. glandulosa</i> suppression (top-kill) and compared this to untreated <i>P. glandulosa</i> woodland (woodland). </p> <p><b>3.</b> The <i>Prosopis</i>/<i>Nassella</i> association limited the window of C<sub>4</sub> mid-grass recovery to only a few years. <i>Nassella leucotricha</i> dominated grass production during the first 3 years after top-kill. C<sub>4</sub> mid-grass recovery began in year 4, but was interrupted by severe drought in years 5 through 7. Recovery resumed in year 8, due to above average summer rainfall, but <i>P. glandulosa</i> regrowth was large enough by this time to limit C<sub>4</sub> mid-grass production to a third of its potential. </p> <p><b>4.</b> <i>Nassella leucotricha</i> basal cover remained dominant and stable in woodland subcanopy microsites, even during drought, and only briefly declined in top-kill subcanopy microsites before returning to pre-treatment levels by year 8 as <i>P. glandulosa</i> regrowth increased and provided shade.</p> <p><b>5.</b> <i>Synthesis and applications</i>. A single suppression event had little impact on disrupting the<i> Prosopis</i>/<i>Nassella</i> association and allowing C<sub>4</sub> mid-grass recovery. The coupling of a deciduous, N-fixing C<sub>3</sub> woody species with this C<sub>3</sub> perennial grass may be a vegetative "state" that is resistant to multiple woody suppression disturbances, and permanently limits the transition back to C<sub>4</sub> grassland. </p>
Field survey quadrat data - Exotic perennial grass invasion profiles differ between temperate threatened grassy communities
<p><b>Aim</b>: Exotic perennial grasses are significant invaders of native grassy communities and frequently multiple species invade communities, some from nearby agricultural areas. There is little understanding of the landscape distribution of many species, making prioritisation for control a difficult decision.</p> <p><b>Location</b>: New South Wales, Eastern Australia</p> <p><b>Methods</b>: We undertook field surveys of exotic perennial grasses at 139 sites from nine grassy threatened ecological communities across four regions and assessed whether the profiles of exotic species varied amongst regions and communities. We used a ranking of invasion risk based on plant characteristics to identify exotic perennial grasses that were likely to be the most invasive and then tested whether this ranking predicted the level of invasion measured in the survey.</p> <p><b>Results</b>: Using multivariate analysis we found that the threatened grassy communities surveyed were significantly invaded by exotic perennial grasses and that these assemblages were regionally distinct and distinct for most plant communities. Five widespread invaders were particularly established in all regions and communities, but regions also had distinct sets of invaders contributing significantly to degradation. Invasion by trade-off species was the most significant threat to grassy communities in all regions. We showed that species with higher risk rankings based on plant characteristics were recorded in more sites but there were a few grasses that were more invasive than their ranking predicted.</p> <p><b>Main conclusions</b>: Our findings indicate that management of grassy plant communities for exotic perennial grasses should be undertaken at the community level although there are a suite of species that are important invaders in the whole landscape where improved understanding of pathways of invasion are needed for management across regions. We identified a set of species which are important invaders but are not a focus in management currently, largely because many of these are species used in pastures. Our study illustrates that higher levels of invasion were associated with species that were ranked more invasive on plant characteristics and this ranking could be used to initially allocate priorities for management of threatened plant communities. Trade-off species remain the major cause of degradation and must be included in discussions of regional conservation.</p>
Рис. 1. Приморские склоны в б. МелководнаЯ, поросШие травой – место обнаружениЯ Deroceras caucasicum на о-ве Русский. Fig. 1. Maritime slopes in Melkovodnaya Bay covered by grass – the biotope locality of Deroceras caucasicum in Russky Island. in Invasion of the pest slug Deroceras caucasicum (Simroth, 1901) to the islands of Peter the Great Bay (Sea of Japan)
Рис. 1. Приморские склоны в б. МелководнаЯ, поросШие травой – место обнаружениЯ Deroceras caucasicum на о-ве Русский. Fig. 1. Maritime slopes in Melkovodnaya Bay covered by grass – the biotope locality of Deroceras caucasicum in Russky Island.
Figure1 in New records of alien and potentially invasive grass (Poaceae) species for southern Africa
Figure1. Agrostis capillaris; A, whole plant; B, junction of sheath and blade of a tiller [sheath should be expanded to see clearly that the ligule is shorter than broad]; C, inflorescence close-up; D, spikelets, lateral view; E, floret, ventral view, showing the well-developed palea. Image A of S.P. Sylvester et al. 3451 (US), B–E of S.P. Sylvester et al. 3451 (PRE).
Invasive grass (Microstegium vimineum) indirectly benefits spider community by subsidizing available prey
<p>1. Invasive plant species cause a suite of direct, negative ecological impacts, but subsequent, indirect effects are more complex and difficult to detect. Where identified, indirect effects to other taxa can be wide-ranging and include ecological benefits in certain habitats or locations.</p> <p>2. Here, we simultaneously examine the direct and indirect effects of a common, invasive grass species (<em>Microstegium vimineum</em>) on the invertebrate communities of understory deciduous forests in the eastern United States. To do this, we use two complementary analytic approaches to compare invaded and reference plots: 1) community composition analysis of understory arthropod taxa and 2) analysis of isotopic carbon and nitrogen ratios of a representative predatory spider species.</p> <p>3. Invaded plots contained a significantly greater abundance of nearly all taxa, including predators, herbivores, and detritivores. Spider communities contained over seven times more individuals and exhibited greater species diversity and richness in invaded plots.</p> <p>4. Surprisingly, however, the abundant invertebrate community is not nutritionally supported by the invasive plant, despite 100% ground cover of <em>M. vimineum</em>. Instead, spider isotopic carbon ratios showed that the invertebrate prey community found within invaded plots was deriving energy from the plant tissue of C<sub>3</sub> plants and not the prevalent, aboveground <em>M. vimineum</em>. </p> <p>5. Synthesis and applications. We demonstrate that invasive <em>M. vimineum</em> can create non-nutritional ecological benefits for some invertebrate taxa, with potential impacts to the nutritional dynamics of invertebrate-vertebrate food webs. These positive impacts, however, may be restricted to habitats that experience high levels of ungulate herbivory or reduced vegetative structural complexity. Our results highlight the importance of fully understanding taxon- and habitat-specific effects of invading plant species when prioritizing invasive species removal or management efforts. </p>
Figure 1 from: Pétillon J, Georges A, Fouillet P (2011) Changes in salt-marsh carabid assemblages after an invasion by the native grass Elymus athericus (Link) Kerguélen. ZooKeys 100: 407-419. https://doi.org/10.3897/zookeys.100.1537
Figure 1 - Location of the study sites (Mont St-Michel Bay, France). Codes: F 'Ferme Foucault' R 'la Rive'.
Figure 2 from: Pétillon J, Georges A, Fouillet P (2011) Changes in salt-marsh carabid assemblages after an invasion by the native grass Elymus athericus (Link) Kerguélen. ZooKeys 100: 407-419. https://doi.org/10.3897/zookeys.100.1537
Figure 2 - Changes in the percentage of halophilic species in the salt marsh after the invasion by Elymus athericus.
Invasive grass (Microstegium vimineum) indirectly benefits spider community by subsidizing available prey
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Field survey quadrat data - Exotic perennial grass invasion profiles differ between temperate threatened grassy communities
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Invasion promotes invasion: facilitation of C3 perennial grass dominance
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Data from: The effect of nitrogen availability and water conditions on competition between a facultative CAM plant and an invasive grass
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Data from: Temperature, topography, soil characteristics, and NDVI drive habitat preferences of a shade-tolerant invasive grass
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Data from: Invasive grass fuel loads suppress native species by increasing fire intensity and soil heating
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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.