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517 results for “barrier islands”
Dataset for "Thresholds in road network functioning on US Atlantic and Gulf barrier islands"
<p>This dataset accompanies the paper "Thresholds in road network functioning on US Atlantic and Gulf barrier islands" (<a href="https://doi.org/10.31223/X55D1G">https://doi.org/10.31223/X55D1G</a>) and is intended to be used to reproduce the analysis. In this dataset you can find the graphml files generated for each island (103 islands with drivable roads). Each intersection of the island road network is a node, and has an associated elevation and extreme water level value. Also included are the statistics for each network, and a single table with the analysis results for each of the networks with >100 nodes.</p>
Linked collectors and determiners for: DNA barcoding the fishes of Lizard Island (Great Barrier Reef).
Natural history specimen data linked to collectors and determiners held within, "DNA barcoding the fishes of Lizard Island (Great Barrier Reef)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/d03ce806-e16f-4cdb-a964-0b965523b908">https://bionomia.net/dataset/d03ce806-e16f-4cdb-a964-0b965523b908</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/d03ce806-e16f-4cdb-a964-0b965523b908">https://gbif.org/dataset/d03ce806-e16f-4cdb-a964-0b965523b908</a>. Formatted as a Frictionless Data package.
Beach Morphology of the Virginia Barrier Islands 1998, 2005 and 2009
Beach features (dune crest, dune toe and shoreline) extracted from LiDAR datasets and used in Dana Oster's 2012 M.S. Thesis at the University of Virginia. Also included are overwash probablities associated with a hypothetical storm similar to Hurricane Bonnie.ÂÂ
Plant Associations on the Virginia Barrier Islands: Metompkin - Smith Islands, 1974-1975.
Vegetation maps and descriptions of plant associations were compiled for 16 (15) barrier and marsh islands on the seaward margin of the Delmarva Peninsula (USA) based on 1:20,000 scale false-color infrared aerial photography taken on June 4, 1974 and subsequent extensive ground-truthing. Twenty-six mapping units based on botanical, topographic, and edaphic characteristics representative of distinct plant associations, ecotones, or non-vegetated surfaces were identified. Published maps were later digitized and georeferenced for use with GIS systems. Chimney Pole Marsh, for which only the inlet-facing shoreline was originally mapped, rather than the whole island, was never digitized and is not included in this dataset.
Locations of Uniola paniculata on selected Virginia Barrier Islands, 2017
A survey was made of the dunes of Assawoman, Northern Metompkin, Cedar, Cobb, Parramore, Hog, Wreck, Smith and Fisherman's islands and the locations of patches of Uniola paniculata were identified. No patches were found on islands for which there is no data. Inflorescence (seed head) stalks of the plants were counted from each location. Pictures were taken at some locations. Travel to the islands and logistical support was provided by the Virginia Tech Shorebird crew. Many thanks to Sarah Karpanty, Jim Fraser, Shannon Ritter, Don Fraser, Erin Heller, and the rest of that great team.
Morphometry of Atlantic Ocean Barrier Islands, Lagoons and Marshes 1978
This data set contains morphometric measures of the lagoons of the Atlantic Coast. The goal was to obtain a measure of the complexity of the marshes that filled the lagoons behind the barrier islands. ABSTRACT The width, depth, marsh cover, and marsh-water interfaces were recorded for the lagoons along the 2000 km of coast between Long Island, New York and Miami, Florida. Eigenvectors of these variables for 134 sites (cases) were calculated and analyzed to identify the characteristic variations of these morphometric attributes. Three modes of variation account for 88% of Ihe variance of the original data: the dominant mode contrasts wide, complex lagoons and narrow, simple lagoons. The second contrasts wide, simple with narrow, complex lagoons. A third mode contrasts wide, shallow, complex with narrow, deep lagoons with few marsh-water intersects. The first mode is correlated geographically with variations in the steepness and curvature of the inner portion of the continental shelf. Using variations in the morphometric attributes of the lagoon-marsh system and the fronting islands on the ocean side, the Atlantic coast barrier islands, lagoons, and marshes are classified into three regions and eight sub-regions. The concept of barrier island ''ensembles'' along the Atlantic coast is reviewed in terms of the island-lagoon marsh system and their covariation with offshore bathymetry. The concept of these ensembles is strongly supported.
Dune Biomass on Hog Island, Virginia Coastal Barrier Islands, 1993-2012
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Data for: The hydrodynamics of Lizard Island lagoon, Great Barrier Reef
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Data set - Island area and historical geomorphological dynamics shape multifaceted diversity of barrier island floras
<div> <p><span>The influence of island dynamics and characteristics on taxonomic diversity, particularly species richness, are well studied. Yet, our knowledge on the influence of island dynamics and characteristics on other facets of diversity, namely functional and phylogenetic diversity, is limited, constraining our understanding of assembly processes on islands (e.g., biogeographic history, dispersal and environmental filtering, and species interactions). Using barrier islands, a highly dynamic and so far, understudied island type, we investigate how multiple facets of vascular plant diversity (functional, phylogenetic and taxonomic diversity) are shaped by island geomorphology, modern and historic area, and habitat heterogeneity. In line with our expectation, historical dynamics in island geomorphology affected phylogenetic and taxonomic diversity via habitat heterogeneity. However, island area was the best predictor across all facets of diversity. Specifically, larger islands had higher functional and phylogenetic diversity than expected by chance while most of the smaller islands had lower diversity. The influence of area on functional diversity acted via habitat heterogeneity, with habitat heterogeneity influencing negatively functional diversity. Our results suggest that larger islands accumulate functionally and phylogenetically unique species. Further, results for functional diversity pointed towards potential area-heterogeneity trade-offs, with these trade-offs likely resulting from increased interspecific competition favoring a specific set of trait values (of stronger competitors), particularly on smaller islands. Together, these results demonstrate that going beyond taxonomic diversity contributes to identifying underlying processes shaping diversity-area relationships. </span></p> </div>
Data set - Island area and historical geomorphological dynamics shape multifaceted diversity of barrier island floras
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Model-derived backbarrier marsh width from GEOMBEST+ simulations of barrier island-marsh coupled evolution for a range of environmental conditions.
Model-derived backbarrier marsh width from GEOMBEST+ simulations of barrier island-marsh coupled evolution for a range of environmental conditions. The input parameters were varied for a range of 10 different values for each of the flux of overwash (.2-2 m^3/yr), the rate of sea level rise (1-10mm/yr), and the flux of bay sediment (2-20 m^3/yr) Each simulation was for a one meter change in sea level, starting from one of three initial conditions, an empty backbarrier basin, starting with a narrow (400m wide) backbarrier marsh, and starting with a marsh-filled (2000m wide) backbarrier basin. With 10 variants of each parameter input and 3 initial conditions, this results in 3,000 total simulations run. Each row in the spreadsheet contains the input and output values for an individual simulation. The outputs reported are the final backbarrier marsh width, defined as the distance from the backside of the barrier island to the landward most marsh cell, the change in marsh width, and the rate of change in marsh width.
FIGURE 1. Helmutneris vadum n in Helmutneris vadum, a new species of Lumbrineridae (Annelida) from Lizard Island, Great Barrier Reef, Australia
FIGURE 1. Helmutneris vadum n. sp. A. Holotype AM W.43952, general view; B. the same, anterior part, ventral view; C. the same, dorsal view; D. Paratype W.46032, maxillary apparatus, dorsal view; E. W.40849, maxilla II, dorsal view; F, the same, maxillae III and IV, dorsal view; G. W.46042, mandibles. Abbreviations: MI—maxilla I, MII—maxilla II, MIII—maxilla III, MIV—maxilla IV, al—attachment lamella, C—maxillary carriers.
FIGURE 2. Helmutneris vadum n in Helmutneris vadum, a new species of Lumbrineridae (Annelida) from Lizard Island, Great Barrier Reef, Australia
FIGURE 2. Helmutneris vadum n. sp. Paratype W.46035. A. Anterior part, ventral view; B. Parapodium 1; C. Parapodia 14– 15; D. Parapodia 31–32; E. Simple multidentate hooded hook, parapodium 12; F. Simple multidentate hooded hook, parapodium 17. G. The same, enlarged. Abbreviations: psl—postchaetal lobe.
Data from: Landscape and oceanic barriers shape dispersal and population structure in the island nematode, Pristionchus pacificus
Despite the biological importance and diversity of nematodes, little is known of the factors influencing their dispersal and shaping their evolutionary history. Populations of the cosmopolitan species Pristionchus pacificus are characterized by high genetic diversity and strong spatial structure, which contrasts with patterns detected in nematode species such as Caenorhabditis elegans. The environmentally heterogeneous volcanic Mascarene Islands provide an ideal setting for investigating fine-scale patterns of nematode migration and gene flow. Based on the analysis of data from 19 nuclear microsatellites and one mitochondrial marker, we infer support for the colonization of both La Réunion Island and Mauritius from similar multiple geographical sources. Although the long-term persistence of populations on both islands is well supported, the historical colonization of one island from the other cannot be discounted. In fact, periodic, bi-directional migration between the islands following their initial colonization is strongly supported in isolation with migration analyses, supporting the occurrence of rare trans-oceanic dispersal events in P. pacificus. Through a combination of population and landscape genetic analyses we also infer non-uniform dispersal across the landscape on the island of La Réunion, probably mediated by the movements of beetle hosts. Collectively, we show that gene flow in P. pacificus is limited by environmental and oceanic barriers, and shaped by the intricacies of the nematode–beetle host interaction
Data from: Oceanic barriers promote language diversification in the Japanese Islands
Good barriers make good languages. Scholars have long speculated that geographical barriers impede linguistic contact between speech communities, and promote language diversification in a manner similar to the process of allopatric speciation. This hypothesis, however, has seldom been tested systematically and quantitatively. Here we adopt methods from evolutionary biology and attempt to quantify the influence of oceanic barriers on the degree of lexical diversity in the Japanese Islands. Measuring the degree of beta diversity from basic vocabularies, we find that geographical proximity and, more importantly, isolation by surrounding ocean, independently explains a significant proportion of lexical variation across Japonic languages. Further analyses indicate that our results are neither a byproduct of using a distance matrix derived from a Bayesian language phylogeny nor an epiphenomenon of accelerated evolutionary rates in languages spoken by small communities. Moreover, we find that the effect of oceanic barriers is reproducible with the Ainu languages, indicating that our analytic approach as well as the results can be generalized beyond Japonic language family. The findings we report here are the first quantitative evidence that physical barriers formed by ocean can influence language diversification, and points to an intriguing common mechanism between linguistic and biological evolution.
Data from: Hybridization and barriers to gene flow in an island bird radiation
While reinforcement may play a role in all major modes of speciation, relatively little is known about the timescale over which species hybridize without evolving complete reproductive isolation. Birds have high potential for hybridization, and islands provide simple settings for uncovering speciation and hybridization patterns. Here we develop a phylogenetic hypothesis for a phenotypically-diverse radiation of finch-like weaver-birds (Foudia) endemic to the western Indian Ocean islands. We find that unlike Darwin's finches, each island-endemic Foudia population is a monophyletic entity for which speciation can be considered complete. In explaining the only exceptions – mismatches between taxonomy, mitochondrial and nuclear data – phylogenetic and coalescent methods support introgressive hybridization rather than incomplete lineage sorting. Human introductions of known timing of one island-endemic species, to all surrounding archipelagos provide two fortuitous experiments; (1) population sampling at known times in recent evolutionary history, (2) bringing allopatric lineages of an island radiation into secondary contact. Our results put a minimum time bound on introgression (235 years), and support hybridization between species in natural close contact (parapatry), but not between those in natural allopatry brought into contact by human introduction. Time in allopatry, rather than in sympatry, appears key in the reproductive isolation of Foudia species.
FIGURES 1–3. 1–2. Holorchis gigas n in Holorchis gigas n. sp. (Digenea: Lepocreadiidae) from the yellow-striped sweet-lips Plectorhinchus chrysotaenia (Perciformes: Haemulidae) from Lizard Island, Great Barrier Reef, with observations on Aephnidiogenes major
FIGURES 1–3. 1–2. Holorchis gigas n. sp. 1. Ventral view of holotype, uterus in bold outline. 2. Terminal genitalia, with part of ventral sucker outlined. 3. Aephnidiogenes major Yamaguti from Diagramma labiosum, Heron Island, terminal genitalia, with ovary and part of ventral sucker outlined. Scale bars: 1, 2 mm; 2, 3, 500 μm.
FIGURES 1–2. Prosorhynchoides thomasi n in Exploiting mimicry: Prosorhynchoides thomasi n. sp. (Digenea: Bucephalidae) from the fang blenny genus Plagiotremus (Bleeker) (Blenniidae) from off Lizard Island on the Great Barrier Reef, Australia
FIGURES 1–2. Prosorhynchoides thomasi n. sp. 1. Ventral view of holotype from Plagiotremus tapeinosoma. 2. Cirrus-sac, ventral view. Scale bars 1, 200µm; 2, 100µm.
FIGURE 28. Hemisirella pulchra Hansen, 1910. A in A survey of Mysida from the Lizard Island area, Great Barrier Reef, Australia, Subfamily Siriellinae (Crustacea, Mysida, Mysidae)
FIGURE 28. Hemisirella pulchra Hansen, 1910. A, left uropod (male) ventral view. B, telson and right uropod (male) dorsal view. C, terminal border of telson. Scalebars = A, B: 0.2 mm; C: 0.05 mm.
FIGURE 25. Siriella vulgaris Hansen, 1910. A in A survey of Mysida from the Lizard Island area, Great Barrier Reef, Australia, Subfamily Siriellinae (Crustacea, Mysida, Mysidae)
FIGURE 25. Siriella vulgaris Hansen, 1910. A, endopod of left uropod, ventral view. B, telson and right uropod, dorsal view. C, telson. Scalebars = A–C: 0.2 mm.
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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.