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552 results for “species abundance”
Fig. 1 in Unveiling global species abundance distributions
Fig. 1 | Conceptual scheme illustrating the Poisson sampling of a community with species abundances described by a gamma or a log-normal distribution. Two types of gSAD—gamma (left) and log-normal distribution (right) are shown at the top.Each distribution represents the probability f of a species having a given abundance λ, with the gamma distribution having parameters k (shape) and θ (scale) and the log-normal distribution having parameters μ (mean) and σ (standard deviation), and Γ() representing the gamma function.In the middle, sampling of the gSAD with the probability of each species having a given number of individuals sampled described by a Poisson distribution is illustrated. The mean abundance of each species sampled is randomly taken from the SAD.We exemplify two samples of different sizes, where different symbols denote individuals of different species. The bottom graphs show that: if the global abundances have a log-normal distribution, the mixture distribution of abundances in the sample is a Poisson log-normal; if the global abundances follow a gamma distribution the resulting mixture distribution is a negative binomial but in the limit k→0, we obtain the Fisher log-series.
Arctic migrations shape global meta-communities: Contrasting insights from species occurrence, abundance and biomass
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Abundance-mediated species interactions between coyote, fisher, and marten in Northeastern US
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Data from: Species that dominate spatial turnover can be of (almost) any abundance
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CABO forest inventory survey data: Canopy-level spectra, species abundances, and environmental conditions
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North American bird declines are greatest where species are most abundant
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Data from: An effective method for ecosystem-scale manipulation of bird abundance and species richness
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Integrating presence-only and detection/non-detection data to estimate distributions and expected abundance of difficult-to-monitor species on a landscape-scale
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Insectivore diet and abundance determine the contribution of bird species to services and disservices in an agricultural ecosystem
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Data from: Abundant top predators increase species interaction network complexity in Northeastern Chinese forests
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Data for: Assortative mating in an ecological context: Effects of mate choice errors and relative species abundance on the frequency and asymmetry of hybridization
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SPIKEPIPE: A metagenomic pipeline for the accurate quantification of eukaryotic species occurrences and intraspecific abundance change using DNA barcodes or mitogenomes
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Future abundance and distribution of key bird species for pathogen transmission in the Netherlands
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A new Double Observer based census framework to improve abundance estimations in mountain ungulates and other gregarious species with a reduced effort
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Abundance and species composition of benthic heterobranch molluscs from the Santa Barbara Channel mainland
These data are counts of heterobranch molluscs (sea slugs and allies) from rocky intertidal sites on the mainland coast of the Santa Barbara Channel. Data collection began in 2002 and 2008 at Naples Point and Tar Pits Reef, respectively, and is ongoing. Data include counts of individuals of 68 total species, presence/absence of their egg masses, and search time (as observer hours) for each sampling trip.
Presence, abundance, and environmental data from 1996 on Celastrus orbiculatus and other exotic plant species in the southern Appalachians, USA
A variety of abiotic, biotic, human and historic variables related to environmental suitability and propagule pressure determine the distribution of invasive plants in a landscape. Understanding the role of these variables for invasive species is challenging because environmental variables are often correlated, many invaders have broad ecological niches, and invasive distributions are often highly dynamic. The researchers examined the role of environmental variables at multiple spatial scales on the distribution of an invasive vine Celastrus orbiculatus (Celastraceae) and other exotic plant species in the southern Appalachians, USA. Data were collected in the Southern Blue Ridge Province of the southern Appalachian Mountains in western North Carolina, USA. This data set includes data on elevation, environmental disturbance, and the presence and abundance of various plant species. The researchers extracted presence and absence data from various sources, including the National Park Service and U.S. Forest Service survey data (NPS/USFS) and Southern Appalachian Volunteer Environmental Monitoring data (SAVEM) (Albright et al. 2009).
Fall 2013 grasshopper monitoring -- mid-marsh grasshopper abundance and species diversity at eight GCE LTER sampling sites
Grasshopper abundance and species diversity were investigated at eight sampling sites within the Georgia Coastal Ecosystems (GCE) LTER study area in August 2013. Visual surveys were conducted along 8 2m by 10m transects randomly allocated within the mid-marsh zone at each site. All grasshoppers observed within each transect were counted and identified to species, if possible. This survey was conducted as part of the GCE invertebrate monitoring program, and will be performed annually to assess long-term changes in relative species abundances across the GCE study area.
MCR LTER: Coral Reef: Community Dynamics: Physical Characteristics of Branching Acropora Patches and Species Richness and Abundances of Associated Fishes
Branching corals, like many in the genus Acropora, provide structurally complex habitats for reef fishes and other organisms. Fluctuations in the abundance, distribution and characteristics of staghorn Acroporid corals may contribute to changes in the abundance and species composition of reef fishes due to changes in the availability of shelter habitat and food. Farming damselfishes of the genus Stegastes occur in high abundances in staghorn thickets and actively defend food and nest space against organisms that threaten these resources. Here I examine the value of staghorn thickets as habitat for fishes, and how the presence of territorial farming damselfishes may influence the assemblage of fishes that associate with staghorn corals. Surveys of 185 Acropora pulchra thickets located in the lagoons surrounding the island of Moorea, French Polynesia revealed 85 species of fish from 25 families. Total fish abundance and species richness values ranged from no fish on a thicket to a high of 275 individuals and 26 species. Thicket area was the most important characteristic in explaining variation in attributes of the fish assemblage among staghorn thickets, with other characteristics explaining little of the species composition or trophic structure. Behavioral observations revealed that farming damselfishes were most aggressive toward corallivores, herbivores, and egg predators, while they ignored most carnivores and omnivores. Despite this pattern, I observed positive covariance between Stegastes and the group of fishes that elicited the strongest aggressive response when the effect of thicket area was removed, suggesting these fishes remain drawn to the resources produced or enhanced by Stegastes on A. pulchra thickets.
Figure 5 in Winter species composition, diversity and abundance of macrozoobenthos in Kuwait's waters, Arabian Gulf
Figure 5. Changes in the abundance A and the number of species B in relevance with depth.
Figure 1 in Winter species composition, diversity and abundance of macrozoobenthos in Kuwait's waters, Arabian Gulf
Figure 1. Location of the benthic stations sampled during 3–18 December 2004.
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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.