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47 results for “Niche expansion”
Data for: Range and niche expansion through multiple interspecific hybridization - a genotyping by sequencing analysis of Cherleria (Caryophyllaceae)
<p><b>Background:</b> <i>Cherleria</i> (Caryophyllaceae) is a circumboreal genus that also occurs in the high mountains of the northern hemisphere. In this study, we focus on a clade that diversified in the European High Mountains, which was identified using nuclear ribosomal (nrDNA) sequence data in a previous study. With the nrDNA data, all but one species was monophyletic, with little sequence variation within most species. Here, we use genotyping by sequencing (GBS) data to determine whether the nrDNA data showed the full picture of the evolution in the genomes of these species.</p> <p><b>Results:</b> The overall relationships found with the GBS data were congruent with those from the nrDNA study. Most of the species were still monophyletic and many of the same subclades were recovered, including a clade of three narrow endemic species from Greece and a clade of largely calcifuge species. The GBS data provided additional resolution within the two species with the best sampling, <i>C. langii</i> and <i>C. laricifolia</i>, with structure that was congruent with geography. In addition, the GBS data showed significant hybridization between several species, including species whose ranges did not currently overlap.</p> <p><b>Conclusions:</b> The hybridization led us to hypothesize that lineages came in contact on the Balkan Peninsula after they diverged, even when those lineages are no longer present on the Balkan Peninsula. Hybridization may also have helped lineages expand their niches to colonize new substrates and different areas. Not only do genome-wide data provide increased phylogenetic resolution of difficult nodes, they also give evidence for a more complex evolutionary history than what can be depicted by a simple, branching phylogeny.</p>
Data for: Population niche width is driven by within-individual niche expansion and individual specialization in introduced brook trout in mountain lakes
<p><span>The width of a population's resource use niche is determined by individual diet breadth ("within-individual component") and the degree of niche partitioning between individuals ("between-individual component"). The balance between these two factors affects ecological stability and evolutionary trajectories, and may shift as ecological opportunity permits broader population niches. Lakes in California's Sierra Nevada Mountains vary in resource diversity for introduced brook trout (<em>Salvelinus fontinalis</em>) due to elevation, lake morphometry, and watershed features. We compared the relative contributions of within- and between-individual niche components to two measures of the dietary niches of thirteen populations of brook trout: prey taxonomic composition and prey size distribution. For both taxonomic and size diversity of fish diets, population niche width was positively related to both the within- and between-individual components. For taxonomic diversity, the two components increased in parallel, while for size diversity, the between-individual component became more important relative to the within-individual component in populations with the greatest niche widths. Our results support the Niche Variation Hypothesis that populations with broader niches are more heterogeneous among individuals and show that individual niche width and individual specialization can operate in parallel to expand the population niche.</span></p>
Niche expansion of capuchin monkeys to forest floor on guild-reduced islands increases interspecific spatio-temporal overlap
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Data for: Range and niche expansion through multiple interspecific hybridization - a genotyping by sequencing analysis of Cherleria (Caryophyllaceae)
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Data from: Parasite spillover rather than niche expansion explains infection of host brain by diplostomid eye flukes
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Data from: Niche packing, but not niche expansion, explains the co-occurrence of hummingbirds-visited plants
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Data for: Population niche width is driven by within-individual niche expansion and individual specialization in introduced brook trout in mountain lakes
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Niche and geographic expansions of North American trees and tall shrubs in Europe
<p>dataset_all = dataset used in analysis</p> <p>spe_info = information about species</p> <p>bio_1 - bio_19 = Worldclim raster for native range (North America)</p> <p>bio_1_inv - bio_19_inv = Worldclim rasters for invaded range (Europe)</p>
Datafile - In situ adaptation and ecological release facilitate the occupied niche expansion of an invasive Madagascan day gecko in Florida
<p><u>Aim</u> To investigate whether the frequently advocated climate-matching species distribution modelling approach could predict the well-characterized colonization of Florida by the Madagascar giant day gecko <i>Phelsuma grandis</i>.</p> <p><u>Location</u> Madagascar and Florida, USA.</p> <p><u>Methods</u> To determine the climatic conditions associated with the native range of <i>P</i>. <i>grandis</i>, we used native-range presence-only records and <i>Bioclim</i> climatic data to build a Maxent species distribution model and projected the climatic thresholds of the native range onto Florida. We then built an analogous model using Florida presence-only data and projected it onto Madagascar. We constructed a third model using native-range presences for both <i>P</i>. <i>grandis</i> and the closely related parapatric species <i>P</i>. <i>kochi</i>.</p> <p><u>Results</u> Despite performing well within the native range, our Madagascar <i>Bioclim</i> model failed to identify suitable climatic habitat currently occupied by <i>P</i>. <i>grandis</i> in Florida. The model constructed using Florida presences also failed to reflect the distribution in Madagascar by over-predicting distribution, especially in western areas occupied by <i>P</i>. <i>kochi</i>. The model built using the combined <i>P</i>. <i>kochi</i>/<i>P</i>. <i>grandis</i> dataset modestly improved the prediction of the range of <i>P</i>. <i>grandis</i> in Florida, thereby implying competitive exclusion of <i>P</i>. <i>grandis</i> by <i>P</i>. <i>kochi</i> from habitat within the former's fundamental niche. These findings thus suggest ecological release of <i>P</i>. <i>grandis</i> in Florida. However, because ecological release cannot fully explain the divergent occupied niches of <i>P</i>. <i>grandis</i> in Madagascar versus Florida, our findings also demonstrate some degree of <i>in situ</i> adaptation in Florida.</p> <p><u>Main conclusions</u> Our models suggest that the discrepancy between the predicted and observed range of <i>P</i>. <i>grandis</i> in Florida is attributable to either <i>in situ</i> adaptation by <i>P</i>. <i>grandis</i> within Florida, or a combination of such <i>in situ</i> adaptation <i>and </i>competition with <i>P</i>. <i>kochi</i> in Madagascar. Our study demonstrates that climate-matching species distribution models can severely underpredict the establishment risk posed by non-native herpetofauna.</p>
The role of a synanthropic bird in the nest niche expansion of a secondary cavity-nester to man-made structures
<p><span>Species with similar ecological characters often compete with each other; however, a species may also facilitate the survival or reproduction of another ecologically similar species although such interaction is rarely documented in birds. Here we reported a facilitative species interaction between Asian house martins (<em>Delichon dasypus</em>) and russet sparrows (<em>Passer cinnamomeus</em>), both passerines using closed nests, in a montane farming area of Taiwan. We found that Asian house martins constructed dome-shaped nests in human houses that provided additional nest sites for russet sparrows, secondary cavity-nesters with greatly declining populations in Taiwan. Russet sparrows that used house martin nests had reproductive success comparable to those that used artificial nest boxes. However, Asian house martins avoided reclaiming sparrow-used nests, which reduced their available nest sites. Interestingly, our results imply that man-made structures may be used as a conservation tool to improve the breeding of the endangered russet sparrows via this facilitative interaction.</span></p>
The confluence of traits and environmental factors driving diversification and niche expansion in the globally distributed order Myrtales
<p>Supplementary files for the article: <strong>The confluence of traits and environmental factors driving diversification and niche expansion in the globally distributed order Myrtales</strong></p>
Data from: Integrating demographic niches and black spruce range expansion at subarctic treelines
<p>When investigating relationships between species' niches and distributions, niches can be divided demographically, resulting in unique niches for different life stages. This approach can identify changing substrate requirements throughout a species' life cycle. Using non-metric multidimensional scaling, we quantified microsite conditions associated with successful recruitment in the tundra landscape and successful seed production amongst adult trees of black spruce (<em>Picea mariana</em>) at subarctic treeline in Yukon, Canada to assess how life stage-specific requirements may impact the distribution of this widespread boreal tree species. Treeline ecotones in this region showed high heterogeneity in tundra microsites available for establishment. Black spruce exhibited changing microsite associations from germination to reproductive maturity, which were mainly driven by changes in plant community and soil moisture. These associations limit the microsites where individuals can establish and reproduce to a subset available within the heterogeneous landscape. Overall, we suggest that (1) substrates suitable for early recruitment are limited at the range edge; and (2) reproductive adults have a narrow niche, limiting successful seed production in adults and forming sink populations where suitable conditions are limited. Our multivariate assessment of microsite suitability can provide valuable insights into the spatial distribution of a species throughout its life cycle and identify life stage-specific constraints to range expansion.</p>
Data from: Wallace 2: A shiny app for modeling species niches and distributions redesigned to facilitate expansion via module contributions
<p>These are the occurrence locality datasets used in the example provided in "<em>wallace</em> 2: a <em>shiny</em> app for modeling species niches and distributions redesigned to facilitate expansion via module contributions" published in Ecography (DOI: 10.1111/ecog.06547). The analysis workflow is displayed in the Supporting information of the paper (Fig. S1), and these data are also used in the <em>wallace</em> 2 vignette (<a href="https://wallaceecomod.github.io/wallace/articles/tutorial-v2.html">https://wallaceecomod.github.io/wallace/articles/tutorial-v2.html</a>).</p>
Sequencing data for: Chronosequence of invasion reveals minimal losses of population genomic diversity, niche expansion, and trait divergence in the polyploid, leafy spurge
<p>Rapid evolution may play an important role in the range expansion of invasive species and modify forecasts of invasion, which are the backbone of land management strategies. However, losses of genetic variation associated with colonization bottlenecks may constrain trait and niche divergence at leading range edges, thereby impacting management decisions that anticipate future range expansion. The spatial and temporal scales over which adaptation contributes to invasion dynamics remain unresolved. We leveraged detailed records of the ~130-year invasion history of the invasive polyploid plant, leafy spurge (<em>Euphorbia</em> <em>virgata</em>), across ~500km in Minnesota, U.S.A. We examined the consequences of range expansion for population genomic diversity, niche breadth, and the evolution of germination behavior. Using genotyping-by-sequencing, we found some population structure in the range core, where introduction occurred, but panmixia among all other populations. Range expansion was accompanied by only modest losses in sequence diversity, with small, isolated populations at the leading edge harboring similar levels of diversity to those in the range core. The climatic niche expanded during most of the range expansion, and the niche of the range core was largely non-overlapping with the invasion front. Ecological niche models indicated that mean temperature of the warmest quarter was the strongest determinant of habitat suitability and that populations at the leading edge had the lowest habitat suitability. Guided by these findings, we tested for rapid evolution in germination behavior over the time course of range expansion using a common garden experiment and temperature manipulations. Germination behavior diverged from early to late phases of the invasion, with populations from later phases having higher dormancy at lower temperatures. Our results suggest that trait evolution may have contributed to niche expansion during invasion and that distribution models, which inform future management planning, may underestimate invasion potential without accounting for evolution.</p>
Data from: Wallace 2: A shiny app for modeling species niches and distributions redesigned to facilitate expansion via module contributions
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Data from: Tree-fungal interactions across climatic gradients: What is the potential for tree niche expansion via varying fungal associations?
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The role of a synanthropic bird in the nest niche expansion of a secondary cavity-nester to man-made structures
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Data from: Integrating demographic niches and black spruce range expansion at subarctic treelines
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Data from: Adaptive plasticity and niche expansion in an invasive thistle
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Sequencing data for: Chronosequence of invasion reveals minimal losses of population genomic diversity, niche expansion, and trait divergence in the polyploid, leafy spurge
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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
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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.
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