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115 results for “limiting factors”
Competition is a major limiting factor of refueling in migratory passerines during stopover
<p>For an avian migrant, refueling capacity attainable during stopovers governs the entire migration schedule and, ultimately, its fitness. Specifically, timely replenishing energy stores is critical when migration involves crossing ecological barriers, within which refueling may be limited. Here, we tested the hypothesis that fuel deposition rates (FDRs) of migratory passerines within barrier-edge stopover sites are constrained by the density of potential competitors, irrespective of migration season, phenology, and local environmental conditions. We also evaluated diverse intra- and inter-specific competition scenarios and explored a potential mediation of density-dependence by environmental factors. The analyzed data, collected by us over 13 consecutive years (2009–2022), contains information on seven species of long-distance migratory insectivorous passerines measured within eight desert-edge habitats throughout autumn and spring migrations. As predicted, our analyses revealed negative density-dependence regulation of FDRs, consistent across species and migration seasons. Notably, bird density exerted its effect above and beyond the other factors known to influence FDR, such as relative ambient temperature, phenology, temporal progress of stopover, and body mass next to landfall. As expected, FDR increased at higher relative ambient temperatures and with the stopover's progress. In spring, FDR also rose as the season advanced. These findings signify the substantial impact of competition on the refueling performance of migratory passerines during their stopover on an ecological barrier's edge, acting over and above the other environmental factors. The detected importance of competition and its interrelation with other predictors provides an insight into stopover's functioning; environmentally imposed and inescapable interspecific interference is thus a significant limiting factor of FDR, a deleterious relationship potentially remediable by informed habitat restoration and planning.</p>
Ambulant Laparoscopic Nephrectomy; Are There Limiting Factors
ClinicalTrials.gov study NCT01600157. IPD Sharing: Not stated. Countries: 1. Publications: 9.
Identification of Risk Factors for Acute Coronary Events by OCT After STEMI and NSTEMI in Patients With Residual Non-flow Limiting Lesions
ClinicalTrials.gov study NCT03857971. IPD Sharing: UNDECIDED. Countries: 1. Publications: 3.
Anatomical and Perioperative Predisposing Factor for Limb Occlusion of Incraft Infrarenal Endograft (LIMIT Study)
ClinicalTrials.gov study NCT05324657. IPD Sharing: NO. Countries: 1. Publications: 2.
Data from: Limited gene dispersal and spatial genetic structure as stabilizing factors in an ant-plant mutualism
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Data from: Limited influence of local and landscape factors on finescale gene flow in two pond-breeding amphibians
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Data from: Fine-scale genetic structure in a wild bird population: the role of limited dispersal and environmentally-based selection as causal factors
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Data from: Manipulation of habitat isolation and area implicates deterministic factors and limited neutrality in community assembly
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Data from: Limits on information transduction through amplitude and frequency regulation of transcription factor activity
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Environment as a limiting factor of the historical global spread of mungbean
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Factors limiting plant recruitment in a Tropical Afromontane Forest
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Data from: Biogeography and host-related factors trumps parasite life-history: limited congruence among the genetic structures of specific ectoparasitic lice and their rodent hosts
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Defaunated and invaded insular tropical rainforests will not recover alone: recruitment limitation factors disentangled by hierarchical models of spontaneous and assisted regeneration
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Competition is a major limiting factor of refueling in migratory passerines during stopover
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Data from: Regional response of grassland productivity to changing environment conditions influenced by limiting factors
<p>Regional differences and regulatory mechanisms of vegetation productivity response to changing environmental conditions constitute a core issue in macroecological researches. To verify the main limiting factors of different macrosystems [temperature-limited Tibetan Plateau (TP), precipitation-limited Mongolian Plateau (MP), and nutrient-limited Loess Plateau (LP)], we conducted a comparative survey of the east-west grassland transects on the three plateaus and explored the factors limiting regional productivity and their underlying mechanisms. The results showed that aboveground net primary productivity (ANPP) of LP (109.10 ± 16.76 g m<sup>−2</sup> yr<sup>−1</sup>) was significantly higher than that of MP (66.71 ± 11.11 g m<sup>−2</sup> yr<sup>−1</sup>) and TP (57.02 ± 10.59 g m<sup>−2</sup> yr<sup>−1</sup>). The response rate of ANPP with environmental changes was different among different plateaus, being closely related to the main limiting factors. On MP, this was precipitation, on LP it was temperature and nutrients, and on TP, it was non-specific, reflecting restriction by the extremely low temperature. After autocorrelation screening of environmental factors, different regions exhibited different productivity response mechanisms. MP was mainly influenced by temperature and precipitation, LP was influenced by temperature and nutrient, and TP was influenced by nutrient, reflecting the modifying effect of the main limiting factors. The effect of each regional environment on ANPP was 72.56% on average and only 27.18% after simple regional integration. The regional model could optimize the simulation error of the integrated model, and the relative deviations in MP, LP, and TP were reduced by 31.76%, 17.22%, and 2.23%, respectively. These findings indicate that the grasslands on the three plateaus may have different or even the opposite mechanisms to control productivity.</p>
Shade is the most important factor limiting growth of a woody range expander
The expansion of woody plants into grasslands and old fields is often ascribed to fire suppression and heavy grazing, especially by domestic livestock. However, it is also recognized that nutrient availability and interspecific competition with grasses and other woody plants play a role in certain habitats. I examined potential factors causing range- and niche expansion by the eastern redcedar Juniperus virginiana, the most widespread conifer in the eastern United States, in multifactorial experiments in a greenhouse. Historical records suggest that the eastern redcedar is a pioneer forest species, and may be replaced as the forest increases in tree density due to shading. Another possible factor that affects its distribution may be nutrient availability, which is higher in old fields and other disturbed lands than in undisturbed habitats. In its historic range, eastern redcedars are particularly abundant on limestone outcrops, often termed 'cedar barrens'. However, the higher abundance on limestone could be due to reduced interspecific competition rather than a preference for high pH substrates. I manipulated shade, fertilization, lime, and interspecific competition with a common dominant tree, the post oak Quercus stellata . In a separate experiment, I manipulated fire and grass competition. I measured growth rates (height and diameter) and above- and belowground biomass at the end of both experiments. I also measured total non-structural carbohydrates and nitrogen in these plants. Shade was the most important factor limiting the growth rates and biomass of eastern redcedars. I also found that there were significant declines in nitrogen and non-structural carbohydrates when shaded. These results are consistent with the notion that the eastern redcedar is a pioneer forest species, and that shade is the reason that these redcedars are replaced by other tree species. In the second experiment, I found that a single fire had a negative effect on young trees. There was no significant effect of competition with grass, perhaps because the competitive effect was shading by grasses and not nutrient depletion. Overall, the effects of shade were far more apparent than the effects of fire.
The environmental factors limiting the distribution of shallow-water terebratulid brachiopods
<p class="western"><span><span>The Cenozoic genus <i>Terebratula</i> seems to be an exception to the Post-Permian trend in brachiopod retreat to offshore habitats because it was species-rich and numerically abundant in warm-temperate shallow-water environments in the Mediterranean and the Paratethys realms. This was so despite the general dominance of bivalves and the pervasive bioturbation and predation pressure during the Neogene. <i>Terebratula</i>, however, went extinct in the Calabrian (Pleistocene). The optimal environmental conditions for <i>Terebratula </i>during its prime are poorly known. The Águilas Basin (SE Spain) is an ideal study area to investigate the habitat of <i>Terebratula</i> because shell beds of this brachiopod occur there cyclically in early Pliocene deposits. We evaluate the paleoecological boundary conditions controlling the distribution of <i>Terebratula </i>by estimating its environmental tolerances using benthic and planktic foraminiferal and nannoplankton assemblages and oxygen isotopes of the secondary layer brachiopod calcite. Our results suggest that <i>Terebratula </i>in the Águilas Basin favored oligotrophic to mesotrophic, well-oxygenated environments at water depths of 60-90 m. Planktic foraminiferal assemblages and oxygen isotopes point to sea-surface temperatures between ~16 and 22ºC, and bottom-water temperatures between 17 and 24ºC. The analyzed proxies indicate that <i>Terebratula </i>tolerated local variations in water depth, bottom temperature, oxygenation, productivity and organic enrichment. <i>Terebratula</i> was probably excluded by grazing pressure from well-lit environments and preferentially occupied sediment-starved, current-swept upper offshore habitats where coralline red algae were absent. Narrow temperature ranges of <i>Terebratula</i> species might have been a disadvantage during the high-amplitude seawater temperature fluctuations that started about 1 Myr ago, when the genus went extinct.</span></span></p>
Data from: Regional response of grassland productivity to changing environment conditions influenced by limiting factors
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Data from: Biotic interactions and seed deposition rather than abiotic factors determine recruitment at elevational range limits of an alpine tree
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Shade is the most important factor limiting growth of a woody range expander
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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.