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7 results for “species dissimilarity”
Similar parasite communities but dissimilar infection patterns in two closely related chickadee species
<p>Haemosporidian parasite communities are broadly similar in Boulder County, CO between two common songbirds –– the Black-capped Chickadee (<em>Poecile</em> <em>atricapillus</em>) and Mountain Chickadee (<em>Poecile</em> <em>gambeli</em>). However, Mountain Chickadees appear more likely to be infected with <em>Plasmodium</em> and potentially experience higher infection burdens with <em>Leucocytozoon</em> in contrast to Black-capped Chickadees. We found that elevation change (and associated ecology) drives the distributions of these parasite genera. For Boulder County chickadees, environmental factors play a more important role in structuring haemosporidian communities than host evolutionary differences. However, evolutionary differences are likely key to shaping the probability of infection, infection burden, and whether an infection remains detectable over time. We found that for recaptured birds, their infection status (i.e., presence or absence of detectable parasite infection) tends to remain consistent across capture periods. We sampled 234 chickadees between 2017–2021 across a ~1500-meter elevation gradient from low elevation (i.e., the city of Boulder) to comparatively high elevation (i.e., the CU Boulder Mountain Research Station). It is unknown whether long-term haemosporidian abundance trends have changed over time in our sampling region. However, we ask whether potentially disparate patterns of <em>Plasmodium</em> susceptibility and <em>Leucocytozoon</em> infection burden could be playing a role in the negative population trends of Mountain Chickadees.</p>
Similar parasite communities but dissimilar infection patterns in two closely related chickadee species
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Data from: Trait hierarchies are stronger than trait dissimilarities in structuring spatial co-occurrence patterns of common tree species in a subtropical forest
<p>1. The dissimilarity and hierarchy of trait values that characterize niche and fitness differences, respectively, have been increasingly applied to infer mechanisms driving community assembly and to explain species co-occurrence patterns. Here, we predict that limiting similarity should result in the spatial segregation of functionally similar species, while functionally similar species will be more likely to co-occur either due to environmental filtering or competitive exclusion of inferior competitors (hereafter hierarchical competition).</p> <p>2. We used a fully mapped 50-ha subtropical forest plot in southern China to explore how pairwise spatial associations between saplings and between adult trees were influenced by trait dissimilarity and hierarchy in order to gain insight into assembly mechanisms. We assessed pairwise spatial associations using two summary statistics of spatial point patterns at different spatial scales and compared the effects of trait dissimilarity and trait hierarchy of different functional traits on the interspecific spatial associations. These comparisons allow us to disentangle the effects of limiting similarity, environmental filtering and hierarchical competition on species co-occurrence.</p> <p>3. We found that trait dissimilarity was generally negatively related with interspecific spatial associations for both saplings and adult trees across spatial scales, meaning that species with similar trait values were more likely to co-occur and thus supporting environmental filtering or hierarchical competition. We further found that trait hierarchy outweighed trait dissimilarity in structuring pairwise spatial associations, suggesting that hierarchical competition played a more important role in structuring our forest community than environmental filtering across life stages.</p> <p>4. This study employed a novel method, by offering the integration of pairwise spatial association and trait dissimilarity as well as trait hierarchy, to disentangle the relative importance of multiple assembly mechanisms in structuring co-occurrence patterns, especially the mechanisms of environmental filtering and hierarchical competition, which lead to indistinguishable co-occurrence patterns. This study also reinforced the importance of trait hierarchy rather than trait dissimilarity in driving neighborhood competition.</p>
Dissimilar climatic niche is predictive of contrasting historical demographic changes and altitudinal shifts in related oak species (<em>Quercus</em>)
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Jaccard dissimilarity in stochastic community models based on the species-independence assumption
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The effect of species composition dissimilarity on plant-herbivore network structure is not consistent over time
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Data from: Exotic or not, leaf trait dissimilarity modulates the effect of dominant species on mixed litter decomposition
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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.
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DANDI Archive for NWB datasets
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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
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