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334 results for “temporal variation”
Figure 3 in Temporal variation and structure of macro-epifauna associated with macrophytes in the Bizerte lagoon (Tunisia, SW Mediterranean Sea)
Figure 3. Monthly variations of the species richness (a) and the density (b) of the macro-epifauna (12 replicates per month) with that of the plant biomass. Bars represent standard error.
Figure 2 in Multi-scale patterns in the host specificity of plant-dwelling arthropods: the influence of host plant and temporal variation on species richness and assemblage composition of true bugs (Hemiptera)
Figure 2. Non-metric multi-dimensional scaling (MDS) ordination showing hemipteran composition for all sampling periods with selected plant species superimposed.
Figure 5 in Multi-scale patterns in the host specificity of plant-dwelling arthropods: the influence of host plant and temporal variation on species richness and assemblage composition of true bugs (Hemiptera)
Figure 5. Annual cyclic pattern of the proportion of the effectively specialized fauna (squares) and singleton species (circles) for the total number of hemipteran species from each sampling period.
Figure 3 in Multi-scale patterns in the host specificity of plant-dwelling arthropods: the influence of host plant and temporal variation on species richness and assemblage composition of true bugs (Hemiptera)
Figure 3. Mean number of individuals (from SIMPER analysis) of dominant hemipteran species, during each sampling period, for most plant species.
Figure 1 in Multi-scale patterns in the host specificity of plant-dwelling arthropods: the influence of host plant and temporal variation on species richness and assemblage composition of true bugs (Hemiptera)
Figure 1. Interactions between plant species sampled and sampling period for (A) abundance (number of individuals) per plant and (B) species richness per plant (standard error bars are shown).
Figure 6 in Multi-scale patterns in the host specificity of plant-dwelling arthropods: the influence of host plant and temporal variation on species richness and assemblage composition of true bugs (Hemiptera)
Figure 6. Relationship between the effectively specialized fauna (squares) and singleton species (circles) for the number of hemipteran species from each sampling period and for the entire collection. An exponential decay equation is fitted for effectively specialized fauna, y = 2.973∗ exp (−0.00575∗ x) + (−1.478), R2 = 0.7598, and for singleton species, y = 22.53∗exp (−0.08466∗x) + 0.2614, R2 = 0.9873.
Figure 5 in Diversity and temporal variations of the leafhopper fauna (Cicadellidae, Auchenorrhyncha, Hemiptera) in two ecological zones of Egypt
Figure 5. Seasonal fluctuations of the mean monthly temperature and relative humidity in Qena and Alexandria governorates throughout 2018. SE: standard error.
Figure 4 in Diversity and temporal variations of the leafhopper fauna (Cicadellidae, Auchenorrhyncha, Hemiptera) in two ecological zones of Egypt
Figure 4. Monthly variation in the mean density of leafhoppers per week caught by light trap in Alexandria governorate during 2018. Error bars represent the mean abundance for 4 consecutive weeks per month in three sites (12 counts).
Data from: Model selection analysis of temporal variation in benefit for an ant-tended treehopper
<p>Recent studies of mutualism have emphasized both that the net benefit to participants depends on the ecological context and that the density‐dependent pattern of benefit is key to understanding the population dynamics of mutualism. Indeed, changes in the ecological context are likely to drive changes in both the magnitude of benefit and the density‐dependent pattern of benefit. Despite the close linkage between these two areas of research, however, few studies have addressed the factors underlying variation in the density‐dependent pattern of benefit. Here I use model selection to evaluate how variation in the benefits of a mutualism drives temporal variation in the density‐dependent pattern of net benefit for the ant‐tended treehopper Publilia concava. In the interaction between ants and treehoppers in the genus <i>Publilia</i>, ants collect the sugary excretions of treehoppers as a food resource, and treehoppers benefit both directly (e.g., by feeding facilitation) and indirectly (e.g., by predator protection). Results presented here show that temporal changes in the relative magnitude of direct and indirect benefit components of ant tending, especially the effectiveness of predator protection by ants, qualitatively change the overall pattern of density‐dependent benefit between years with maximum benefit shifting from treehoppers in small to large aggregations. These results emphasize the need for empirical studies that evaluate the long‐term dynamics of mutualism and theoretical studies that consider the population dynamics consequences of variation in the density‐dependent pattern of benefit.</p>
Spatial and temporal variation in the diet of introduced sambar deer (Cervus unicolor) in an alpine landscape
<p><strong>Context</strong>. In south-eastern Australia, the abundance and distribution of non-native sambar deer (<em>Cervus</em> <em>unicolor</em>) has increased dramatically in alpine environments. As a result, significant concern surrounds the potential for the species to impact rare plant species and vegetation communities through browsing.</p> <p><strong>Aims</strong>. We aimed <span>to determine the diversity of the plant species eaten by sambar deer in the Alpine National Park and to understand any spatial and temporal variation in deer diets.</span></p> <p><strong>Methods</strong>. We collected 90 sambar deer faecal pellet samples over a three-month flowering period across two contrasting study sites with differing elevation, vegetation, and underlying geology. We performed DNA sequencing using the ITS2 gene region and assigned dietary items to the lowest taxonomic level possible. The frequency of occurrence and sequencing read depth of each dietary item were calculated to investigate the diet of sambar deer at spatial and temporal scales, and dietary preferencing was assessed by comparing the frequency of occurrence of dietary items to the observation records for each dietary item in the study area.</p> <p>Key results. We detected a total of 369 unique plant <span>Operational Taxonomic Units </span>(OTUs) from sambar deer faecal samples, representing 35 families and 80 genera. Considerable variation in the diet was observed over small spatial scales, and evidence of temporal diet variation was noted in one of the study sites. We detected <span>Silky Snow-daisy (<em>Celmisia</em> <em>sericophylla</em>), which is currently listed as critically endangered under the Flora and Fauna Guarantee Act 1988, and </span>Hawkweed (<em>Pilosella</em> spp.), a highly invasive, non-native taxon which is sparingly established in Alpine ecosystems.</p> <p><strong>Conclusions</strong>. Sambar deer displayed an intermediate feeder behaviour in alpine environments, foraging on a variety of forbs and shrubs, however, forbs were the dominant dietary items. The spatial variation observed in the diet of sambar deer suggests that individual deer are unlikely to be dispersing widely while foraging. </p> <p><strong>Implications</strong>. Our results emphasise the need for careful evaluation of sambar deer impacts within individual sites and at small spatial scales. The detection of species of conservation significance in the diet indicates that the presence of sambar deer should be considered a significant risk to biodiversity in areas of high conservation value.</p>
Temporal Variation in Exhaled Volatile Organic Compounds in Esophageal Cancer Patients
ClinicalTrials.gov study NCT06453993. IPD Sharing: NO. Countries: 2. Publications: 2.
Data from: Spatio-temporal variation of biotic and abiotic stress agents determines seedling survival in assisted oak regeneration
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Data from: Temporal variation in the genetic structure of a drone congregation area: An insight into the population dynamics of wild African honeybees (Apis mellifera scutellata)
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Data from: Relationships between spatio-temporal environmental and genetic variation reveal an important influence of exogenous selection in a pupfish hybrid zone
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Data from: 10 years of life in compost: temporal and spatial variation of North German C. elegans populations
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Data from: Temporal variation in spatial genetic structure during population outbreaks: distinguishing among different potential drivers of spatial synchrony
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Data from: Temporal variation of Bistorta vivipara-associated ectomycorrhizal fungal communities in the High Arctic
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Multiple long-term, landscape-scale datasets reveal intraspecific spatial variation in temporal trends for bird species
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Data from: Spatial variation buffers temporal fluctuations in early juvenile survival for an endangered Pacific salmon
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Temporal and spatial variation in population structure among brooding sea stars in the genus Leptasterias
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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