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73 results for “exotic invasion”
Fig.5 in Intriguing additions of exotic and invasive ants to The Gambia (Hymenoptera: Formicidae)
Fig.5 Solenopsis globularia (Smith, F., 1858) (CASENT0104501), Florida, USA. Worker. A, Head frontal view. B, Habitus lateral view. © Antweb.
Fig.4 in Intriguing additions of exotic and invasive ants to The Gambia (Hymenoptera: Formicidae)
Fig.4 Paratrechina longicornis (Latreille, 1802) (CASENT0125018), Madagascar. Worker. A, Head frontal view. B, Habitus lateral view. © Antweb.
Fig.3 in Intriguing additions of exotic and invasive ants to The Gambia (Hymenoptera: Formicidae)
Fig.3 Monomorium floricola (Jerdon, 1851) (CASENT0146777), Comoros. Worker. A, Head frontal view. B, Habitus lateral view. © Antweb.
Fig.1 Brachymyrmex depilis Emery, 1893 in Intriguing additions of exotic and invasive ants to The Gambia (Hymenoptera: Formicidae)
Fig.1 Brachymyrmex depilis Emery, 1893 (CASENT0106038), USA. Worker. A, Head frontal view. B, Habitus lateral view. © Antweb.
Fig.2 in Intriguing additions of exotic and invasive ants to The Gambia (Hymenoptera: Formicidae)
Fig.2 Hypoponera ragusai (Emery, 1894) (KGCOL02534), Gambia. Worker. A, Head frontal view. B, Habitus lateral view. © Julien Lalanne (RBINS).
Invasion by an exotic species in a three-species competition-diffusion system
<p>We consider the situation where an exotic species <em>w</em> invades an ecosystem inhabited by two native species <em>u</em> and <em>v</em>. All species are competing for the same limited resource. Supposing that <em>u</em> and <em>v</em> are not able to coexist in the absence of the invader, we want to determine whether a successful invasion by <em>w</em> may allow all species to coexist (competitor-mediated coexistence). Mathematically, this problem can be modelled by the following three-species competition-diffusion system<br> <span class="math-tex">\( \left\{ \begin{alignedat}{6} u_t &= d_1 \, \Delta u &&+ (r_1 &&- u &&- b_{12} \, v &&- b_{13} \, w &&)\,u, \\ v_t &= d_2 \, \Delta v &&+ (r_2 &&- v &&- b_{21} \, u &&- b_{23} \, w &&)\,v, \\ w_t &= d_3 \, \Delta w &&+ (r_3 &&- w &&- b_{31} \, u &&- b_{32} \, v &&)\,w, \end{alignedat} \right.\)</span><br> where all parameters are positive constants.</p> <p>We are interested in the case in which the invading species is weaker than the native ones, i.e., it is not able to survive in the diffusion-free system obtained by setting <em>d</em><sub>1</sub> = <em>d</em><sub>2</sub> = <em>d</em><sub>3</sub> = 0.<br> We fix all parameters as<br> <span class="math-tex">\( \begin{aligned} & d_1 = d_2 = d_3 = 1, \\ & r_1 = r_2 = 28, \\ & \begin{aligned} b_{12} &= 22/21, & b_{13} &= 4, \\ b_{21} &= 1.87, & b_{23} &= 3/4, \\ b_{31} &= 26/21, & b_{32} &= 22/21, \\ \end{aligned} \end{aligned}\)</span><br> and leave <em>r</em><sub>3</sub>, which measures the strength of the exotic species, as a free parameter. Depending on the value of <em>r</em><sub>3</sub>, the invasion can be either successful or not and competitor-mediated coexistence may or may not occur, as can be seen in the movies here presented. The species <em>u</em>, <em>v</em> and <em>w</em> are denoted by the red, green and blue colours respectively. The yellow line marks the interface between the species <em>u</em> and <em>v</em>. We remark that competitor-mediated coexistence only occurs for intermediate values of <em>r</em><sub>3</sub>.</p>
Supplementary material 3 from: Karasawa S, Nakata K (2018) Invasion stages and potential distributions of seven exotic terrestrial isopods in Japan. BioRisk 13: 53-76. https://doi.org/10.3897/biorisk.13.23514
Pearson's correlation coefficients (r) between climatic variables for the global model (Japan, Europe and North America) :
Table S1. List of taxa identified on buoys and their invasion status. N = native, E = exotic, C = cryptogenic, HI = historical introduction and ni = non identified.
<p><span>List of taxa identified on buoys and their invasion status. N = native, E = exotic, C = cryptogenic, HI = historical introduction and ni = non identified.</span></p>
Supplementary material 2 from: Colombari F, Battisti A (2023) Citizen science at school increases awareness of biological invasions and contributes to the detection of exotic ambrosia beetles. In: Jactel H, Orazio C, Robinet C, Douma JC, Santini A, Battisti A, Branco M, Seehausen L, Kenis M (Eds) Conceptual and technical innovations to better manage invasions of alien pests and pathogens in forests. NeoBiota 84: 211-229. https://doi.org/10.3897/neobiota.84.95177
Slides of the lecture on 'Monitoring of insect species harmful to trees and forests' and link to educational videos
Data from: Correlation of native and exotic species richness: a global meta-analysis finds no invasion paradox across scales
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Data from: Negative effects of an exotic grass invasion on small-mammal communities
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Data from: Massive invasion of exotic Barbus barbus and introgressive hybridisation with endemic B. plebejus in Northern Italy: where, how and why?
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Data from: Exotic invasive plants increase productivity, abundance of ammonia-oxidizing bacteria, and nitrogen availability in intermountain grasslands
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Data from: Reduced mycorrhizal responsiveness leads to increased competitive tolerance in an invasive exotic plant
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Data from: Logging, exotic plant invasions, and native plant reassembly in a lowland tropical rain forest
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Data from: Shrubs as ecosystem engineers across an environmental gradient: effects on species richness and exotic plant invasion
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Data from: Attractiveness of exotic invasive plants can disconnect native plants from their floral visitors
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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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Data from: Soil conditioning affects interactions between native and invasive exotic perennials of semi-natural grasslands
1. Semi–natural perennial grasslands are of increasing importance as components of multifunctional agroecosystems, combining biomass production with provision of other ecosystem services. Soil legacies from previous land use or exotic species can hinder their establishment, but might be overcome through a multi–stage successional strategy, whereby certain species are used to facilitate native grassland species establishment. We tested this strategy via a feedback experiment examining soil conditioning effects on interference interactions between native and exotic species. 2. Soils in a former maize–soybean production field in Minnesota, USA, were conditioned for three years with native or invasive exotic perennials or a maize–soybean crop rotation. Nitrogen (N) fertilisation was an additional treatment in field plots. In a greenhouse, native and invasive exotic perennial grassland seedlings were grown on these soils, in monoculture and in native–exotic species pairs, with and without N fertilisation. The impact of soil conditioning and field and greenhouse N fertilisation on interactions between native and exotic seedlings in mixture was determined. 3. Neighbouring plants suppressed biomass production in all native and exotic species. The maize–soybean rotation left a soil legacy that enhanced suppression of native species when grown with exotic species, while exotic species suffered no such disadvantage. 4. The strong and specific disadvantage to native species of maize–soybean soils decreased with greenhouse N fertilisation, but remained significant, while field N addition did not alter this effect. 5. Synthesis and applications. We find that the negative soil legacy of the maize–soybean rotation for native plant performance in interaction with exotics was greatly diminished in soils conditioned by native or exotic perennial species, irrespective of nitrogen addition. This highlights the potential value of perennial species in conversion from row–crop agriculture to grasslands, because all perennial species alleviated the enhanced suppression of natives observed on maize–soybean soils. We did not find strong evidence that these perennial species were capable of specifically facilitating native species over exotics, but a broader range of species should be evaluated.
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>
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Allen Brain Atlas
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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.