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139 results for “Species turnover”
Species redistribution combined with invasive dominance but not species turnover promotes biotic homogenization following invasion
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Data for: Increases in functional diversity of mountain plant communities is mainly driven by species turnover under climate change
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High species turnover and unique plant–pollinator interactions make a hyperdiverse mountain
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Data from: Low species turnover of upland Amazonian birds in the absence of physical barriers
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Effects of species richness and turnover on ecosystem functioning in heterogeneous environments of two tropical mountains
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The biotic interactions hypothesis partially explains bird species turnover along a lowland Neotropical precipitation gradient
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Data from: Evaluating temporal turnover in avian species richness in a Mediterranean semiarid region: different responses to elevation and forest cover
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Spatial genetic differentiation correlates with species assemblage turnover across tropical reef fish lineages
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Data from: Opportunistic data reveal widespread species turnover in Enallagma damselflies at biogeographical scales
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Data from: A case for the “Competitive exclusion – tolerance rule” as a general cause of species turnover along environmental gradients
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Mapping trait versus species turnover reveals spatiotemporal variation in functional redundancy and network robustness in a plant‐pollinator community
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Data from: The Chord-Normalized Expected Species Shared (CNESS)-distance represents a superior measure of species turnover patterns
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Developmental plasticity does not improve performance during a species interaction: implications for species turnover
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Revealing the drivers of parasite community assembly: using avian haemosporidians to model global dynamics of parasite species turnover
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The role of island physiography and oceanographic factors in shaping species richness and turnover of nesting seabird assemblages on islands across the southeastern Pacific
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FIGURE 4 in Quantifying vertebrate zoogeographical regions of Australia using geospatial turnover in the species composition of mammals, birds, reptiles and terrestrial amphibians
FIGURE 4. The zoogeographical regions proposed by Cracraft (1991, thick black lines) and superimposed over the three clusters found in this study.
Expanded response data from Perrin et al. - Contrasts in Public Perception of the Role of Alien Species in Climate Driven Species Turnover
<p>Responses given by 30 respondents from 3 different interest groups on their attitudes to climate change driven species turnover in Norwegian freshwater lakes.</p> <p>The groups are a) recreational fishers, b) individuals responsible for management decisions regarding freshwater lakes or rivers and c) academics involved in research regarding freshwater lakes or rivers.</p> <p>Use of square brackets indicates details have been altered so as to preserve anonymity of respondents.</p> <p>A total of 30 interviews were conducted between August of 2019 and April of 2020. Interviews lasted anywhere from 10 to 50 minutes. Of the 30 interviews, 16 were conducted in person, with the remaining 14 conducted via web meeting. Interview respondents were chosen using the snowball method, as described by Miles and Huberman <a href="https://paperpile.com/c/6PEtIR/dSUU/?noauthor=1">(1994)</a>. This requires an initial pool of contacts, who subsequently nominate other respondents that are suitable for the study. </p> <p>In compliance with requirements of the Norwegian National Research Ethics Committee, all respondents were given an overview of the topic beforehand, assured that their responses would be anonymous, and informed of the intended use of their responses. All interviews were anonymously recorded and subsequently transcribed verbatim. Any details which might have allowed the individuals to be identified based on descriptions of their roles or locations were removed. As interviews were anonymous, ethics approval from the Norwegian National Research Ethics Committee was not required.</p>
Data from: The biotic interactions hypothesis partially explains bird species turnover along a lowland Neotropical precipitation gradient
<p><strong>Aim:</strong> We evaluated the influence of climate in determining bird communities along precipitation gradients. We argue that mechanisms responsible for community turnover along precipitation gradients are similar to mechanisms operating along temperature and latitudinal gradients. We test the hypothesis that environmental conditions affect community composition in dry forests, whereas biotic interactions affect community composition in wet forests.</p> <p><strong>Location:</strong> Low-elevation forests along a precipitation gradient in Colombia where precipitation ranges from 700 – 4000 mm annually but elevation and temperature remain constant.</p> <p><strong>Time period:</strong> Present day</p> <p><strong>Major Taxa Studied:</strong> Tropical Forest Birds.</p> <p><strong>Methods:</strong> We performed 291 bird counts in nine study areas across the ~3000 mm precipitation range. In each locality we obtained climatic characteristics, and a phylogenetic, morphological and physiological proxy data set to test predictions about the evolutionary relationships and distribution of traits.</p> <p><strong>Results:</strong> Bird communities changed abruptly along the precipitation gradient and could be divided into dry and wet forest communities. Analyses of phylogenetic relationships, trait space, and observations at nests suggested that environmental filtering is more important in dry forest, especially for breeding. In contrast, we found little evidence that competition was more important in wet forest. Nest predation or competition for nest space, however, may be more critical in wetter forests.</p> <p><strong>Conclusions:</strong> The two distinct bird communities we documented suggest that lowland precipitation gradients, where temperature is constant, can be as important as temperature gradients in generating high beta diversity. We conclude that the breeding process in bird communities might be crucial for determining community assembly along environmental gradients. Given that recent population declines in tropical birds have been attributed to changes in precipitation, by understanding the mechanisms underlying community assembly along precipitation gradients our study may improve our ability to understand those declines and predict the effects of climate change on neotropical avifauna.</p>
Data from: Dispersal, niche, and isolation processes jointly explain species turnover patterns of nonvolant small mammals in a large mountainous region of China
Understanding the mechanisms that govern the spatial patterns of species turnover (beta diversity) has been one of the fundamental issues in biogeography. Species turnover is generally recognized as strong in mountainous regions, but the way in which different processes (dispersal, niche, and isolation) have shaped the spatial turnover patterns in mountainous regions remains largely unexplored. Here, we explore the directional and elevational patterns of species turnover for nonvolant small mammals in the Hengduan Mountains of southwest China and distinguish the relative roles of geographic distance, environmental distance, and geographic isolation on the patterns. The spatial turnover was assessed using the halving distance (km), which was the geographic distance that halved the similarity (Jaccard similarity) from its initial value. The halving distance was calculated for the linear, logarithmic, and exponential regression models between Jaccard similarity and geographic distance. We found that the east–west turnover is generally faster than the south–north turnover for high-latitudinal regions in the Hengduan Mountains and that this pattern corresponds to the geographic structure of the major mountain ranges and rivers that mainly extend in a south–north direction. There is an increasing trend of turnover toward the higher-elevation zones. Most of the variation in the Jaccard similarity could be explained by the pure effect of geographic distance and the joint effects of geographic distance, environmental distance, and average elevation difference. Our study indicates that dispersal, niche, and isolation processes are all important determinants of the spatial turnover patterns of nonvolant small mammals in the Hengduan Mountains. The spatial configuration of the landscape and geographic isolation can strongly influence the rate of species turnover in mountainous regions at multiple spatial scales.
Data from: Diversity in tropical ecosystems: the species richness and turnover of moths in Malaysian rainforests
As a contribution to accurate estimation of arthropod alpha and beta diversities in tropical forests, we present results of some of the largest moth samples ever collected in the Malaysian region. To estimate alpha diversity, light traps were run at three geographically distinct locations. We generated individual-based and coverage-based rarefaction curves to estimate sampling sufficiency and alpha diversity of the locations. Despite a large number of moths collected (67 282 individuals, from three locations), none of the rarefaction curves reached asymptote. The species accumulation curves based on the Chao1 richness estimator at each location suggested that, even when sampling yielded over 30 000 individuals, Chao1 could not reliably estimate the observed number of species. In one of the three locations, moths were collected systematically by light traps in 1979–1980 and 2000–2001. Despite over 160 trapping nights and 16 500 individuals collected in total, the estimated total number of species (2262) was well below the general collection conducted at the same location over a 35-year period [3921 species (1975–2013)]. Beta diversity was investigated using the samples collected at one location on two occasions over a 20-year period. The faunal composition has changed over the 20-year period, possibly as a result of extensive land-use change around the study location. We estimated the minimum sampling effort required to detect such changes by calculating type II errors. Unlike alpha diversity estimation, we found that only four replicate samples, each with only two trapping nights, would be sufficient to reliably detect changes in assemblage composition.
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Allen Brain Atlas
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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.
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.