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227 results for “range size”
Supplementary Data and Code: Determinants of range sizes pinpoint vulnerability of groundwater species to climate change: a case study on subterranean amphipods from the Dinarides
<p>Supplementary Data and R code for phylogenetic analyses for manuscript entitled <em>Determinants of range sizes pinpoint vulnerability of groundwater species to climate change: a case study on subterranean amphipods from the Dinarides.</em></p> <p><strong>The dataset contains</strong></p> <p><em>beast.tree</em> → data for import into R: maximum credibility phylogeny<br> <em>data_lambert.csv</em> → data for import into R: data on habitat and distribution for 52 <em>Niphargus </em>species<br> <em>morpho.csv</em> → data for import into R: morphometric data (body length) for 52 <em>Niphargus </em>species<br> <em>niphargus_ranges.Rmd</em> → fully reproducible R markdown file<br> <em>niphargus_ranges.html </em>→ html output of Rmd file</p> <p>To be able to run the analysis put the data files into folder <data> and run the Rmd script.</p>
Climate or diet? The importance of biotic interactions in determining species range size
<p><strong>Aim</strong>: Species geographical range sizes play a crucial role in determining species vulnerability to extinction. Although several mechanisms affect range sizes, the number of biotic interactions and species climatic tolerance are often thought to play discernible roles, defining two dimensions of the Hutchinsonian niche. Yet, the relative importance of the trophic and the climatic niche for determining species range sizes is largely unknown.<br><br><strong>Location</strong>: Central and Northern Europe<br><strong>Time period</strong>: Present<br><strong>Major taxa studied</strong>: Gall-inducing sawflies and their parasitoids<br><br><strong>Methods</strong>: We use data documenting the spatial distributions and biotic interactions of 96 herbivore species, and their 125 parasitoids, across Europe and analyse the relationship between species range size and the climatic and trophic dimensions of the niche. We then compare the observed relationships with null expectations based on species occupancy to understand whether the relationships observed are an inevitable consequence of species range size or if they contain information about the importance of each dimension of the niche on species range size.<br><br><strong>Results</strong>: We find that both niche dimensions are positively correlated with species range size, with larger ranges being associated with wider climatic tolerances and larger numbers of interactions. However, diet breadth appears to more strongly limit species range size. Species with larger ranges have more interactions locally and they are also able to interact with a larger diversity of species across sites (i.e. higher beta-diversity), resulting in a larger number of interactions at continental scales.<br><br><strong>Main conclusions</strong>: We show for the first time how different aspects of species diet niche are related to their range size. Our study offers new insight into the importance of biotic interactions in determining species spatial distributions, which is critical for improving understanding and predictions of species vulnerability to extinction under the current rates of global environmental change.</p>
Legume and ant polygons for range size analysis and visualization
<p>Mutualism improves organismal fitness, but strong dependence on another species can also limit a species' ability to thrive in a new range if its partner is absent. We assembled a large, global dataset on mutualistic traits and species ranges to investigate how multiple plant-animal and plant-microbe mutualisms affect the spread of legumes and ants to novel ranges. We found that generalized mutualisms increase the likelihood that a species establishes and thrives beyond its native range, whereas specialized mutualisms either do not affect or reduce non-native spread. This pattern held in both legumes and ants, indicating that specificity between mutualistic partners is a key determinant of ecological success in a new habitat. Our global analysis shows that mutualism plays an important, if often overlooked, role in plant and insect invasions.</p>
FIGURE 1 in Range sizes of groundwater amphipods (Crustacea) are not smaller than range sizes of surface amphipods: a case study from Iran
FIGURE 1 Distribution map of analyzed gammarid and niphargid species from Iran. Red circles show gammarid distribution records. Black triangles show previous niphargid distributions. Blue triangles show new distribution of Niphargus populations in this study.
FIGURE 4 in Range sizes of groundwater amphipods (Crustacea) are not smaller than range sizes of surface amphipods: a case study from Iran
FIGURE 4 Violin plots, representing maximum linear extent for Gammarus and Niphargus species delimited using ABGD (A) and bPTP (B). The white dot in the middle indicates the median value in the range size, the thick black bar in the center represents the interquartile range and the thin black line shows 95% of all data. The distributions of surface species are not larger than the distributions of subterranean species (Mann-Whitney U test, p = 0.794 (A), p = 0.837 (B)). MOTUs found on a single localities are excluded.
FIGURE 3 in Range sizes of groundwater amphipods (Crustacea) are not smaller than range sizes of surface amphipods: a case study from Iran
FIGURE 3 Species delimitations of new Niphargus populations. The figure shows the BEAST tree as inferred from COI gene sequences. Putative species, as a result of species delineation using bPTP and ABGD, are indicated with side bars. Please note that the figure does not contain five additional species for which we did not have COI sequences, known from a single locality, which proved to be morphologically and genetically distinct according to the more conservative 28S gene marker. New samples are presented in boldface.
Predator home range size mediates indirect interactions between prey species in an arctic vertebrate community
<ol> <li>Indirect interactions are widespread among prey species that share a common predator, but the underlying mechanisms driving these interactions are often unclear, and our ability to predict their outcome is limited. </li> <li>Changes in behavioural traits that impact predator space use could be a key proximal mechanism mediating indirect interactions, but there is little empirical evidence of the causes and consequences of such behavioural-numerical response in multi-species systems. </li> <li>Here, we investigate the complex ecological relationships between seven prey species sharing a common predator. We used a path analysis approach on a comprehensive 9-year dataset simultaneously tracking predator space use, prey densities, and prey mortality rate on key species of a simplified Arctic food-web. </li> <li>We show that high availability of a clumped and spatially predictable prey (goose eggs) leads to a two-fold reduction in predator (arctic fox) home range size, which increases local predator density and strongly decreases nest survival of an incidental prey (American golden plover). On the other hand, a scattered cyclic prey with potentially lower spatial predictability (lemming) had a weaker effect on fox space use and an overall positive impact on the survival of incidental prey.</li> <li>These contrasting effects underline the importance of studying behavioural responses of predators in multi-prey systems and to explicitly integrate behavioural-numerical responses in multi-species predator-prey models.</li> </ol>
Data for: Marine fish movement: home range sizes for commercially relevant species
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Data from: Sex-specific resource strategies mediate home range sizes of an endangered carnivore across multiple scales
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Data from: The evolution of environmental tolerance and range size: A comparison of geographically restricted and widespread Mimulus
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Climate or diet? The importance of biotic interactions in determining species range size
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Predator home range size mediates indirect interactions between prey species in an arctic vertebrate community
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Data from: Social and seasonal variation in dwarf mongoose home-range size, daily movements and burrow use
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Legume and ant polygons for range size analysis and visualization
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Diversification in the Rosales is influenced by dispersal, geographic range size, and pre-existing species richness
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Data and R codes: species range-size variation in oaks
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No evidence for the consistent effect of supplementary feeding on home range size in terrestrial mammals
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Data from: Effects of home range size and burrow fidelity on survival and reproduction in eastern chipmunks (Tamias striatus) across different environmental contexts
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Elevational range size patterns of vascular plants in Himalaya contradict Rapoport’s rule
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Home range use in the West Australian seahorse Hippocampus subelongatus is influenced by sex and partner’s home range but not by body size or paired status
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