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141 results for “species density”
Figure 3 in Density, occupancy and detectability of tortoise species (Chelonoidis spp.) in the Atlantic Forest: implications for conservation and management
Figure 3. Relationship between the probability of occupancy of Chelonoidis denticulatus (A) and Chelonoidis carbonarius (B) with the distance from the water resource, and relationship between the probability of occupancy of Chelonoidis denticulatus and the percentage of forest cover (C) in the Vale Natural Reserve, Brazil.
FIGURE 5 in Using an Asteraceae checklist to understand collection history, species density and conservation implications: a case study in the state of Alagoas, Northeastern Brazil
FIGURE 5. Continental Protected Areas in the state of Alagoas. 1. Natural Monument of the São Francisco. 2. Wildlife Refuge of Morros do Craunã and Padre. 3. Ecological Station Curral do Meio. 4. Ecological Park Pedra do Sino. 5. Biological Reserve Pedra Talhada. 6. Environmental Protection Area Marituba do Peixe. 7. Environmental Protection Area of Piaçabuçu. 8. Extractive Reserve Jequiá. 9. Ecological Mangrove Reserve of Lagoa do Roteiro. 10. Ecological Reserve Saco da Pedra. 11. Environmental Protection Area of Santa Rita. 12. Environmental Protection Area of Catolé e Fernão Velho. 13. Municipal Park of Maceió. 14. Environmental Protection Area Patangy. 15. Environmental Protection Area of Murici. 16. Ecological Station of Murici. *RPPN
FIGURE 3 in Using an Asteraceae checklist to understand collection history, species density and conservation implications: a case study in the state of Alagoas, Northeastern Brazil
FIGURE 3. Results of the species richness (a) and collection density (b) analyses, and correlation between these two variables (c).
Interactions with soil fungi alter density-dependence and neighborhood effects in a locally abundant dipterocarp species
<p>Seedling recruitment can be strongly affected by the composition of nearby plant species. At the neighborhood scale (on the order of tens of meters), adult conspecifics can modify soil chemistry and presence of host microbes (pathogens and mutualists) across their combined canopy area or rooting zones. At local or small spatial scales (on the order of one to few meters), conspecific seed or seedling density can influence the strength of intraspecific light and resource competition and also modify the density-dependent spread of natural enemies such as pathogens or invertebrate predators. Intrinsic correlation between proximity to adult conspecifics (i.e. recruitment neighborhood) and local seedling density, arising from dispersal, make it difficult to separate the independent and interactive factors that contribute to recruitment success. </p> <p>Here, we present a field experiment in which we manipulated both the recruitment neighborhood and seedling density to explore how they interact to influence the growth and survival of Dryobalanops aromatica, a dominant ectomycorrhizal tree species in a Bornean tropical rainforest. First, we found that both local seedling density and recruitment neighborhood had effects on performance of D. aromatica seedlings, though the nature of these impacts varied between growth and survival. Second, we did not find strong evidence that the effect of density on seedling survival is dependent on the presence of conspecific adult trees. However, accumulation of mutualistic fungi beneath conspecifics adults does facilitate establishment of D. aromatica seedlings. In total, our results suggest that recruitment near adult conspecifics was not associated with a performance cost and may have weakly benefitted recruiting seedlings. Positive effects of conspecifics may be a factor facilitating the regional hyperabundance of this species. </p> <p>Synthesis: Our results provide support for the idea that dominant species in diverse forests may escape the localized recruitment suppression that limits abundance in rarer species.</p>
Data and code for: Human density modulates spatial associations among tropical forest terrestrial mammal species
<p>The spatial aggregation of species pairs often increases with the ecological similarity of the species involved. However, the way in which environmental conditions and anthropogenic activity affect the relationship between spatial aggregation and ecological similarity remains unknown despite the potential for spatial associations to affect species interactions, ecosystem function, and extinction risk. Given that human disturbance has been shown to both increase and decrease spatial associations among species pairs, ecological similarity may have a role in mediating these patterns. Here, we test the influences of habitat diversity, primary productivity, human population density, and species' ecological similarity based on functional traits (i.e., functional trait similarity) on spatial associations among tropical forest mammals. Large mammals are highly sensitive to anthropogenic change and therefore susceptible to changes in interspecific spatial associations. Using two-species occupancy models and camera trap data, we quantified the spatial overlap of 1,216 species pairs from 13 tropical forest-protected areas around the world. We found that the association between ecological similarity and interspecific species associations depended upon surrounding human density. Specifically, aggregation of ecologically similar species was more than an order of magnitude stronger in landscapes with the highest human density compared to those with the lowest human density, even though all populations occurred within protected areas. Human-induced changes in interspecific spatial associations have been shown to alter top-down control by predators, increase disease transmission and increase local extinction rates. Our results indicate that anthropogenic effects on the distribution of wildlife within protected areas are already occurring and that impacts on species interactions, ecosystem functions, and extinction risk warrant further investigation. </p>
Figure 3. a, linear discriminant function illustrating shape variation between iguanids. Kernel density ellipses for each species illustrate 90 in Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus
Figure 3. a, linear discriminant function illustrating shape variation between iguanids. Kernel density ellipses for each species illustrate 90% and 70% of the data distribution. b, graph of morphometric trait loadings from LD analysis.
Data from: Scale-dependent shifts in the species composition of flower visitors with changing floral density
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Data from: Does movement behaviour predict population densities? a test with 25 butterfly species
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Data from: Estimating densities and spatial distribution of a commensal primate species, the long-tailed macaque (Macaca fascicularis)
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Data from: Direct evidence that density-dependent regulation underpins the temporal stability of abundant species in a diverse animal community
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Data from: Experimental small-scale flower patches increase species density but not abundance of small urban bees
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Data from: Separating sources of density-dependent and density-independent establishment limitation in invading species
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Data and code for: Human density modulates spatial associations among tropical forest terrestrial mammal species
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Density-dependent effects of parasitism on the activity of a benthic engineer species: potential impact on ecosystem functioning
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Data from: The devil is in the detail: estimating species richness, density, and relative abundance of tropical island herpetofauna
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Data from: Estimating density for species conservation: comparing camera trap spatial count models to genetic spatial capture-recapture models
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Support for the habitat amount hypothesis from a global synthesis of species density studies
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Interactions with soil fungi alter density-dependence and neighborhood effects in a locally abundant dipterocarp species
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Assessing the genetic diversity in Argopecten nucleus (Bivalvia: Pectinidae), a functional hermaphrodite species with extremely low population density and self-fertilization: effect of null alleles
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Data from: Introducing resprouters to enhance Mediterranean forest resilience: importance of functional traits to select species according to a gradient of pine density
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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.
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DANDI Archive for NWB datasets
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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.