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33 results for “insect density”
Data from: Intra- and interspecific density dependence mediates weather effects on the population dynamics of a plant-insect herbivore system
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Data from: Experimental evidence that honeybees depress wild insect densities in a flowering crop
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Intraspecific variation in symbiont density in an insect-microbe symbiosis
<p><span><span><span><span><span><span><span><span><span><span><span>Many insects host vertically-transmitted microbes, which can confer benefits to their hosts but are costly to maintain and regulate. A key feature of these symbioses is variation: for example, symbiont density can vary among host and symbiont genotypes. However, the evolutionary forces maintaining this variation remain unclear. We studied variation in symbiont density using the pea aphid (<i>Acyrthosiphon pisum</i>) and the bacterium <i>Regiella insecticola</i>, a symbiont that can protect its host against fungal pathogens. We found that relative symbiont density varies both between two <i>Regiella</i> phylogenetic clades and among aphid 'biotypes'. Higher-density symbiont infections are correlated with stronger survival costs, but variation in density has little effect on the protection <i>Regiella</i> provides against fungi. Instead, we found that in some aphid genotypes, a dramatic decline in symbiont density precedes the loss of a symbiont infection. Together, our data suggest that the optimal density of a symbiont infection is likely different from the perspective of aphid and microbial fitness. <i>Regiella</i> might prevent loss by maintaining high within-host densities, but hosts do not appear to benefit from higher symbiont numbers and may be advantaged by losing costly symbionts in certain environments. The standing variation in symbiont density observed in natural populations could therefore be maintained by antagonistic coevolutionary interactions between hosts and their symbiotic microbes. </span></span></span></span></span></span></span></span></span></span></span></p>
Supplementary material 1 from: Thomaes A, Verschelde P, Mader D, Sprecher-Uebersax E, Fremlin M, Onkelinx T, Méndez M (2017) Can we successfully monitor a population density decline of elusive invertebrates? A statistical power analysis on Lucanus cervus. In: Campanaro A, Hardersen S, Sabbatini Peverieri G, Carpaneto GМ (Eds) Monitoring of saproxylic beetles and other insects protected in the European Union. Nature Conservation 19: 1-18. https://doi.org/10.3897/natureconservation.19.11761
Figures of statistical support : Data type: statistical data
Figure 3 in Population density and diet type interactively affect individual growth of an omnivorous soil-dwelling insect (Anomala cuprea, Coleoptera: Scarabaeidae)
Figure 3. Temporal changes in the coefficient of variation (CV) of larval fresh weight at two population densities and with two diets. Error bars indicate standard error. See Tab. 3 for details of statistical results.
Data from: Increased developmental density decreases the magnitude of indirect genetic effects expressed during agonistic interactions in an insect
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Intraspecific variation in symbiont density in an insect-microbe symbiosis
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Data from: Targeting antibiotic resistant bacteria with phages reduces bacterial density in an insect host
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Data from: Insect herbivory on seedlings of rainforest trees: effects of density and distance of conspecific and heterospecific neighbours
1. Natural enemies of plants such as insect herbivores can contribute to structuring and maintaining plant diversity in tropical forests. Most research in this area has focused on the role of specialised enemies and the extent to which herbivory on individual plant species is density-dependent. 2. Relatively few insect herbivores specialise on a single host plant species. Insect herbivores that feed on more than one plant species may link the regeneration dynamics of their host species through 'apparent competition' or 'apparent mutualism'. 3. We investigated herbivory and survival of seedlings of two tropical tree species (Cordia alliodora and Cordia bicolor) in the forests of Barro Colorado Island (Panama). We used experiments and observations to assess seedling fate in relation to the presence of conspecifics and heterospecifics across a range of spatial scales. 4. Herbivory significantly increased seedling mortality and was highest at high local densities of C. alliodora seedlings. There was also evidence that high local densities of C. alliodora increased herbivory on co-occurring C. bicolor seedlings. 5. Synthesis. The elevated rates of seedling herbivory at high densities of conspecifics documented in our study are consistent with the predictions of the Janzen-Connell hypothesis, which explains how so many plant species can coexist in tropical forests. Our data also highlight the possibility that herbivore-mediated density-dependence, facilitated by herbivores that feed on multiple plant species, can also occur across plant species. Enemy-mediated indirect effects of this sort have the potential to structure plant communities.
Figura 1 in Device for monitoring population density of insects from acoustic signals emitted
Figura 1 – Guido instalado em Muzambinho/MG
Data from: Insect herbivory on seedlings of rainforest trees: effects of density and distance of conspecific and heterospecific neighbours
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Endogenous overexpression of Poplar MYB186 increases trichome density, improves growth rate and insect pest resistance
GEO Series GSE21061. Populus sp.; Populus tremula x Populus alba. 6 samples. Type: Expression profiling by array.
Insect herbivores and soil fertility drive variation in density-dependent seedling dynamics across a fragmented landscape
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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.