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32 results for “Interactions: coexistence”
Data from: An enemy's enemy is an ally: Competitive indirect interactions mediate coexistence of trees, grasses, and subshrubs in Neotropical Savanna
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Data from: Coexistence and the niche in a nurse-cactus interaction: is cyclic dynamics justified?
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The effects of sex allocation coevolution on the coexistence of two closely related plant species interacting via interspecific pollen transfer
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Data from: Accurate predictions of coexistence in natural systems require the inclusion of facilitative interactions and environmental dependency
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Data from: Species coexistence: macroevolutionary relationships and the contingency of historical interactions
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Data from: Epistatic interactions determine the mutational pathways and coexistence of lineages in clonal Escherichia coli populations
Understanding how diversity emerges in a single niche is not fully understood. Rugged fitness landscapes and epistasis between beneficial mutations could explain coexistence amongst emerging lineages. To provide an experimental test of this notion, we investigated epistasis amongst four pleiotropic mutations in rpoS, mglD, malT and hfq present in two coexisting lineages that repeatedly fixed in experimental populations of Escherichia coli. The mutations were transferred into the ancestral background individually or in combination of double or triple alleles. The combined competitive fitness of two or three beneficial mutations from the same lineage was consistently lower than the sum of the competitive fitness of single mutants – a clear indication of negative epistasis within lineages. We also found sign epistasis (i.e. the combined fitness of two beneficial mutations lower than the ancestor), not only from two different lineages (i.e. hfq and rpoS) but also from the same lineage (i.e. mglD and malT). The sign epistasis between loci of different lineages indeed indicated a rugged fitness landscape, providing an epistatic explanation for the coexistence of distinct rpoS and hfq lineages in evolving populations. The negative and sign epistasis between beneficial mutations within the same lineage can further explain the order of mutation acquisition.
Data from: Niche differentiation in the dynamics of host-symbiont interactions: symbiont prevalence as a coexistence problem
Heritable symbioses can have important ecological effects and have triggered important evolutionary innovations. Current predictions for long-term symbiont prevalence are based on their fitness benefits and vertical transmission rates but ignore non-linear competitive feedbacks among symbiotic and symbiont-free hosts. We hypothesized that such feedbacks function as stabilizing mechanisms, promoting coexistence of host types and maintaining intermediate symbiont frequency at the population scale. Using a model grass / endophyte symbiosis, we manipulated competition within and between endophyte-symbiotic (E+) and endophyte-free (E-) hosts and fit competition models to experimental data. We show for the first time that symbiont-structured competition can generate stable coexistence of E+ and E- hosts, even under perfect vertical transmission. Niche differentiation was the key to coexistence, causing hosts of each type to limit themselves more strongly than each other. These results establish roles for non-linear competitive dynamics and niche differentiation in the ecology and evolution of heritable symbionts.
Data from: Diversity increases indirect interactions, attenuates the intensity of competition, and promotes coexistence
A fundamental assumption of coexistence theory is that competition inevitably decreases species diversity. Consequently, in the quest to understand the ecological regulators of diversity, there has been a great deal of focus on processes with the potential to reduce competitive exclusion. However, the notion that competition must decrease diversity is largely based on the outcome of two-species interaction experiments and models, despite the fact that species rarely interact only in pairs in natural systems. In a field experiment, we found that competition among native perennial plants in multispecies assemblages was far weaker than competition between those same species in pairwise arrangements and that indirect interactions appeared to weaken direct competitive effects. These results suggest that community assembly theory based on pairwise approaches may overestimate the strength of competition and likelihood of competitive exclusion in species-rich communities. We also found that Centaurea stoebe, a North American invader, retained strong competitive effects when competing against North American natives in both pairwise and multispecies assemblages. Our experimental results support an emerging body of theory suggesting that complex networks of competing species may generate strong indirect interactions that can maintain diversity and that ecological differentiation may not be necessary to attenuate competition.
Data from: Diversity increases indirect interactions, attenuates the intensity of competition, and promotes coexistence
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Data from: Epistatic interactions determine the mutational pathways and coexistence of lineages in clonal Escherichia coli populations
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Data from: Niche differentiation in the dynamics of host-symbiont interactions: symbiont prevalence as a coexistence problem
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Rancher viewpoint diversity in human-wildlife coexistence management: The case of jaguar-livestock interaction in the region of Calakmul, Mexico
<p>This study focuses on jaguar conservation in ranching landscapes in the Calakmul region of Mexico, where jaguars (Panthera onca) often coexist with ranchers, leading to potential conflicts. To better understand ranchers' perspectives, we conducted discrete choice experiments (DCEs) with 196 ranchers across five localities. The study assessed preferences regarding four key attributes: forest cover, livestock management practices, the desired number of jaguars, and willingness to invest in measures that promote coexistence between livestock and jaguars.</p> <p>Our findings revealed significant diversity in ranchers' preferences. While some ranchers support increased forest cover and the adoption of silvopastoral practices, others prefer reduced forest areas and the absence of jaguars. This heterogeneity underscores the need for tailored conservation strategies that address these diverse viewpoints. Effective conservation policies must go beyond addressing negative interactions with jaguars to also integrate ranchers' fundamental needs, such as education, healthcare, women's empowerment, and cultural preservation.</p> <p>This research highlights the importance of participatory approaches and the value of DCEs in providing actionable insights for developing conservation policies that are both socially acceptable and aligned with local needs. By considering the diverse perspectives of ranchers, this study aims to contribute to more balanced, effective, and equitable jaguar conservation efforts in the Calakmul region.</p> <p> </p>
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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.