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99 results for “coastal dune”
Population bottleneck associated with but likely preceded the recent evolution of self-fertilization in a coastal dune plant
<p>Evolution of self-fertilization may be initiated by a historical population bottleneck, which should diagnostically reduce lineage-wide genetic variation. However, selfing can also strongly reduce genetic variation after it evolves. Distinguishing process from pattern is less problematic if mating system divergence is recent and geographically simple. Dramatically reduced diversity is associated with the transition from outcrossing to selfing in the Pacific coastal endemic Abronia umbellata that includes large-flowered, self-incompatible populations (var. umbellata) south of San Francisco Bay and small-flowered, autogamous populations (var. breviflora) to the north. Compared to umbellata, synonymous nucleotide diversity across 10 single-copy nuclear genes was reduced by 94% within individual populations and 90% across the whole selfing breviflora lineage, which contained no unique polymorphisms. The geographic pattern of genetic variation is consistent with a single origin of selfing that occurred recently (7–28 kya). These results are best explained by a historical bottleneck, but the two most northerly umbellata populations also contained little variation and clustered with selfing populations, suggesting that substantial diversity loss preceded the origin of selfing. A bottleneck may have set the stage for the eventual evolution of selfing by purging genetic load that prevents the spread of selfing.</p>
Exploring controls on coastal dune growth through a simplified model [Dataset]
<p>This dataset contains the Duna model output data, included in the article “Exploring controls on coastal dune growth through a simplified model” published in the <em>Journal of Geophysical Research - Earth Surface</em>.</p> <p>The data is provided as “Fig*.mat” files, processed in MatLab (R2023a), and organised following the structure of the figures presented in the manuscript (e.g., Fig1.mat corresponds to data shown in Fig.1). </p> <p>'Dataset.docx' provides information on the individual files contained in the dataset.</p>
Population bottleneck associated with but likely preceded the recent evolution of self-fertilization in a coastal dune plant
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Back into the past: Resurveying random plots to track community changes in Italian coastal dunes
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Strategic planting and nutrient amendments to accelerate the revegetation of rapidly retreating coastal dunes
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Data from: The contribution of hybridization to range‐wide population genetic structure in a Pacific coastal dune plant
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A preliminary field trial to compare control techniques for invasive Berberis aquifolium in Belgian coastal dunes
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FIGURE 4 in A new species of Psectrascelis (Coleoptera: Tenebrionidae: Pimeliinae) from the coastal dunes of the Atacama Desert, Chile
FIGURE 4. Ventral view comparison of aedeagus and ovipositor of Psectrascelis ammophila sp. nov. (A, B) with Psectrascelis pilosa (C, D). ls, lateral style; b, basal lamina; pb, paraproct baculi; cl2–cl4, coxite plates 2–4; p, paraproct; ss, sensory setae; v, valvifer. Scale bar: 1 mm.
FIGURE 3 in A new species of Psectrascelis (Coleoptera: Tenebrionidae: Pimeliinae) from the coastal dunes of the Atacama Desert, Chile
FIGURE 3. Dorsal and ventral view of the habitus of Psectrascelis ammophila. A-B: Male. D-E: Female. C-F: Tibiae detail of male and female respectively.
FIGURE 2 in A new species of Psectrascelis (Coleoptera: Tenebrionidae: Pimeliinae) from the coastal dunes of the Atacama Desert, Chile
FIGURE 2. Bayesian phylogenetic tree based on COI gene. Numbers on the nodes correspond to the posterior probabilities. Front the tree are dorsal photos of species included in this study (ingroup).
FIGURE 1 in A new species of Psectrascelis (Coleoptera: Tenebrionidae: Pimeliinae) from the coastal dunes of the Atacama Desert, Chile
FIGURE 1. Overview of the distribution of Psectrascelis species included in this study. Rhombs with a black circle are the species sampled and analysed in this study. The yellow areas are the dunes zones in the study area. Most important branches of the Huasco and Copiapó basin are marked with light blue lines. Coastal habitat and a Psectrascelis ammophila sp. nov. specimen in situ in Aguada de Tongoy are shown.
Data from: Twelve years of repeated wild hog activity promotes population maintenance of an invasive clonal plant in a coastal dune ecosystem
Invasive animals can facilitate the success of invasive plant populations through disturbance. We examined the relationship between the repeated foraging disturbance of an invasive animal and the population maintenance of an invasive plant in a coastal dune ecosystem. We hypothesized that feral wild hog (Sus scrofa) populations repeatedly utilized tubers of the clonal perennial, yellow nutsedge (Cyperus esculentus) as a food source and evaluated whether hog activity promoted the long-term maintenance of yellow nutsedge populations on St. Catherine's Island, Georgia, United States. Using generalized linear mixed models, we tested the effect of wild hog disturbance on permanent sites for yellow nutsedge culm density, tuber density, and percent cover of native plant species over a 12-year period. We found that disturbance plots had a higher number of culms and tubers and a lower percentage of native live plant cover than undisturbed control plots. Wild hogs redisturbed the disturbed plots approximately every 5 years. Our research provides demographic evidence that repeated foraging disturbances by an invasive animal promote the long-term population maintenance of an invasive clonal plant. Opportunistic facultative interactions such as we demonstrate in this study are likely to become more commonplace as greater numbers of introduced species are integrated into ecological communities around the world.
Data from: Consequences of multiple mating-system shifts for population and range-wide genetic structure in a coastal dune plant
Evolutionary transitions from outcrossing to selfing can strongly affect the genetic diversity and structure of species at multiple spatial scales. We investigated the genetic consequences of mating system shifts in the North American, Pacific coast dune endemic plant Camissoniopsis cheiranthifolia (Onagraceae) by assaying variation at 13 nuclear (n) and six chloroplast (cp) microsatellite (SSR) loci for 38 populations across the species range. As predicted from the expected reduction of effective population size (Ne) caused by selfing, small-flowered, predominantly selfing (SF) populations had much lower nSSR diversity (but not cpSSR) than large flowered, predominantly outcrossing (LF) populations. The reduction of nSSR diversity was greater than expected from the effects of selfing on Ne alone, but could not be accounted for by indirect effects of selfing on population density. Although selfing should reduce gene flow, SF populations were not more genetically differentiated than LF populations. We detected five clusters of nSSR genotypes and three groups of cpSSR haplotypes across the species range consisting of parapatric groups of populations that usually (but not always) differed in mating system, suggesting that selfing may often initiate ecogeographic isolation. However, lineage-wide genetic variation was not lower for selfing clusters, failing to support the hypothesis that selection for reproductive assurance spurred the evolution of selfing in this species. Within three populations where LF and SF plants coexist we detected genetic differentiation among diverged floral phenotypes suggesting that reproductive isolation (probably postzygotic) may help maintain the striking mating system differentiation observed across the range of this species
Data from: Strong genetic differentiation but not local adaptation towards the range limit of a coastal dune plant
All species have limited geographic distributions; but the ecological and evolutionary mechanisms causing range limits are largely unknown. That many species' geographic range limits are coincident with niche limits suggests limited evolutionary potential of marginal populations to adapt to conditions experienced beyond the range. We provide a test of range limit theory by combining population genetic analysis of microsatellite polymorphisms with a transplant experiment within, at the edge of, and 60 km beyond the northern range of a coastal dune plant. Contrary to expectations, lifetime fitness increased towards the range limit with highest fitness achieved by most populations at and beyond the range edge. Genetic differentiation among populations was strong, with very low, non-directional gene flow suggesting range limitation via constraints to dispersal. In contrast, however, local adaptation was negligible, and a distance-dependent decline in fitness only occurred for those populations furthest from home when planted beyond the range limit. These results challenge a commonly held assumption that stable range limits match niche limits, but also raise questions about the unique value of peripheral populations in expanding species' geographical ranges.
FIGURE 5 in A molecular phylogeny of the " Madascincus polleni species complex ", with description of a new species of scincid lizard from the coastal dune area of northern Madagascar
FIGURE 5. Comparison of the (A) Madascincus "polleni" phenotype (Ankarana, clade 2) and (B) Madascincus stumpffi (uniform color morph from Forêt d'Ambre).
FIGURE 4 in A molecular phylogeny of the " Madascincus polleni species complex ", with description of a new species of scincid lizard from the coastal dune area of northern Madagascar
FIGURE 4. Paratype specimen of Madascincus arenicola sp. nov. (ZSM 2076/2007) in life. (A) dorsolateral view, (B) detail of anterior body and head.
FIGURE 7 in A molecular phylogeny of the " Madascincus polleni species complex ", with description of a new species of scincid lizard from the coastal dune area of northern Madagascar
FIGURE 7. Phylogenetic trees of the "Madascincus polleni species complex": Bayesian analyses inferred from single gene data-set of (A) nuclear DNA (RAG2 gene) and (B) mitochondrial DNA (ND1 gene), and (C) Bayesian tree inferred from the combined analysis of both ND1 and RAG2, with posterior probabilities followed by the bootstrap support values>50% from Maximum Parsimony analysis.
FIGURE 3 in A molecular phylogeny of the " Madascincus polleni species complex ", with description of a new species of scincid lizard from the coastal dune area of northern Madagascar
FIGURE 3. Schematic drawings of dorsal and lateral views of the type specimens of (A, B) Madascincus polleni (holotype MNHN 1895.210); (C, D) M. intermedius (lectotype SMF 16027), and (E, F) M. stumpffi (holotype SMF 16019). Scale bars = 1 mm.
FIGURE 6 in A molecular phylogeny of the " Madascincus polleni species complex ", with description of a new species of scincid lizard from the coastal dune area of northern Madagascar
FIGURE 6. Distribution maps of the different taxa forming the "Madascincus polleni species complex". Colored circles represent localities with voucher specimens and DNA sequences included in the present phylogenetic analyses, whereas black dots represent collection vouchers specimens that have been only used for the morphological study (see appendix for the exact localities).
FIGURE 1 in A molecular phylogeny of the " Madascincus polleni species complex ", with description of a new species of scincid lizard from the coastal dune area of northern Madagascar
FIGURE 1. Number of scincine skink species described per decade in Madagascar. The dark line represents the cumulated data. Dataset based on the species recognised by Glaw & Vences (2007), with addition of two species subsequently described by Köhler et al. (2009, 2010).
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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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.