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1,346 results for “rare species”

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zenodo36/100

Dataset and R code for the manuscript:Interspecific facilitation drives coexistence by favouring rare sensitive species and reducing performance disparities

The following directory contains the data necessary  to replicate the results obtained in the manuscript entitled: Interspecific facilitation drives coexistence by favouring rare sensitive species and reducing performance disparities  We provided an R workspace containing the data "Dataset1.RData", a "ReadMe.txt" archive with detailed information of the variables included in "Dataset1.RData", and the R code necessary to replicate the results and figures ("Rcode1.txt")

opencc-by-4.0Oct 2021View details →

dryad36/100

Phylogeography and genetic variation in Western Jacob's ladder (Polemonium occidentale) provide insights into the origin and conservation of rare species in the Great Lakes region

The perennial herb Western Jacob's Ladder (Polemonium occidentale, Polemoniaceae) is widespread in the mountains of western North America but reappears as a disjunct in the Great Lakes Region in Minnesota and Wisconsin, USA as the narrow endemic P. occidentale subsp. lacustre. This distribution is shown by a diverse assemblage of angiosperms. It has been hypothesized that these species became isolated just after the Last Glacial Maximum, but this has not been tested. Additionally, the genetic diversity and population connectivity of the endemic Great Lakes flora has been understudied, with important conservation implications. Using Genotyping-by-sequencing, we examined the relationship of P. occidentale subsp. lacustre to its closest relatives, relationships among all known populations, and genetic diversity within these populations. Polemonium occidentale subsp. lacustre represents an isolated, unique lineage that diverged from its closest relatives 1.3 ma and arrived in the Great Lakes Region by at least 38 ka. Nearly all extant populations diverged prior to the Last Glacial Maximum, are largely genetically distinct, and show relatively little within-population genetic diversity. Clonality may mitigate reduction in diversity due to drift. Mixed population signal between Wisconsin and some Minnesota populations may be due to gene flow during the Late Pleistocene. While populations of Polemonium occidentale subsp. lacustre may be relictual from a now-extinct western relative, it is best treated as a distinct species. Conservation efforts should focus more on ensuring that current populations remain rather than maintaining large population sizes across a few populations. However, encouraging habitat heterogeneity may accomplish both simultaneously.

opencc-zeroFeb 2023View details →

zenodo36/100

Dataset and R code for the manuscript: Interspecific facilitation favors rare species establishment and reduces performance disparities among adults

The following directory contains the data necessary to replicate the results obtained in the manuscript entitled: Interspecific facilitation favors rare species establishment and reduces performance disparities among adults. We provided an R workspace containing the data "Dataset1.RData", a "ReadMe.txt" archive with detailed information on the variables included in "Dataset1.RData", and the R code necessary to replicate the results ("Rcode1.txt")

opencc-by-4.0Mar 2023View details →

dryad36/100

Performance and preference of four above- and below-ground invertebrate and generalist herbivores on regionally and locally rare plant species

<ol> <li>Rare plant species are suggested to be less resistant to herbivores than common species. Their lower apparency and the fact that they often live in isolated populations, resulting in fewer herbivore encounters, might have led to the evolution of reduced defences. Moreover, their frequently lower levels of genetic diversity compared with common species could negatively affect their resistance against enemies. However, the hypothesis that plant resistance depends on plant regional and local rarity, independently of habitat and competitive and growth strategy, lacks evidence.</li> <li>To test this hypothesis, we assessed the performance and preference of one belowground and three aboveground generalist invertebrate herbivores from different taxonomic groups as indicators of plant resistance. Herbivores were fed a total of 62 regionally and locally rare and common plant species from Switzerland. We accounted for differences in a plant's growth and competitive strategy and habitat resource availability.</li> <li>We found that regionally and locally rare and common plant species did not generally differ in their resistance to most generalist herbivores. However, one herbivore species even performed better and preferred locally and regionally common plant species over rarer ones, indicating that common species are not more resistant, but tend to be less resistant. We also found that all herbivore species consistently performed better on competitive and large plant species, although different herbivore species generally preferred and performed better on different plant species. The latter indicates that the use of generalist herbivores as indicators of plant-resistance levels can be misleading.</li> <li> Synthesis: Our results show that rare plant species are not inherently less resistant than common ones to herbivores. Instead, our results suggest that the ability of plants to allocate resources away from defence towards enhancing their competitive ability might have allowed plants to tolerate herbivory, and to become locally and regionally common.</li> </ol>

opencc-zeroAug 2023View details →

dryad36/100

Data from: Incomplete recovery of tree community composition and rare species after 120 years of tropical forest succession in Panama

Determining how fully tropical forests regenerating on abandoned land recover characteristics of old-growth forests is increasingly important for understanding their role in conserving rare species and maintaining ecosystem services. Despite this, our understanding of forest structure and community composition recovery throughout succession is incomplete, as many tropical chronosequences do not extend beyond the first 50 years of succession. Here, we examined trajectories of forest recovery across eight 1-hectare plots in middle and later stages of forest succession (40 – 120 years) and five 1-hectare old-growth plots, in the Barro Colorado Nature Monument (BCNM), Panama. We first verified that forest age had a greater effect than edaphic or topographic variation on forest structure, diversity and composition and then corroborated results from smaller plots censused 20 years previously. Tree species diversity (but not species richness) and forest structure had fully recovered to old-growth levels by 40 and 90 years, respectively. However, rare species were missing, and old-growth specialists were in low abundance, in the mid- and late secondary forest plots, leading to incomplete recovery of species composition even by 120 years into succession. We also found evidence that dominance early in succession by a long-lived pioneer led to altered forest structure and delayed recovery of species diversity and composition well past a century after land abandonment. Our results illustrate the critical importance of old-growth and old secondary forests for biodiversity conservation, given that recovery of community composition may take several centuries, particularly when a long-lived pioneer dominates in early succession.

opencc-zeroOct 2023View details →

zenodo36/100

Data for "Negative density dependence promotes persistence of a globally rare yet locally abundant plant species (Oenoethera coloradensis)"

This dataset was used to perform the analyses in the manuscript "Negative density dependence promotes persistence of a globally rare yet locally abundant plant species (Oenoethera coloradensis)"

opencc-by-4.0Oct 2023View details →

dryad36/100