On piecewise models and species–area patterns
WebAbstract. Aim: Area thresholds, at which the form of the species–area relationship (SAR) changes abruptly, have played an important role in the theoretical framework of … Web2 de jul. de 2024 · Europe PMC is an archive of life sciences journal literature.
On piecewise models and species–area patterns
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WebTable 1. Model summary table, generated using the ‘summary.sars’ generic function. The table provides information about the fit of six piecewise models, in addition to linear and intercept-only models. See the legend of Fig.2 for dataset information. “Zslope” models are the left-horizontal models, “Cont” are the continuous models, and “Disc” are the … WebMentioning: 24 - Aim Area thresholds, at which the form of the species–area relationship (SAR) changes abruptly, have played an important role in the theoretical framework of …
Web21 de nov. de 2005 · The new extinction projections come from applying a well-known ecological pattern, the species–area relationship (SAR), to data on the current distributions and climatic requirements of 1103 species. Here, I examine the scientific basis to the claims made in the Nature article. Web8 de out. de 2024 · Several models have been proposed, addressing the issue, and they can be reconducted to three main hypotheses developed to explain the species-area relationship: (1) the area-per se hypothesis (known also as the extinction-colonisation equilibrium), (2) the random placement (passive sampling), and the (3) environmental …
Web2 de jun. de 2024 · The positive relationship between species richness and area—the species–area relationship (SAR)—is a key principle in ecology. Previous studies show large variation in the SAR across taxa collectively indicating the necessity of a taxon-focused approach to accurately evaluate biodiversity scaling patterns. Web20 de jan. de 2024 · Growing evidence suggests that biodiversity on small islands and fragments could be independent of island area, a pattern called the Small Island Effect (SIE). We searched for SIE among the floras of 19 courtyards completely enclosed by buildings in central St Petersburg, Russia, in 1993, 2003 and 2008.
Web8 de out. de 2024 · Area and environmental heterogeneity influence species richness in islands. Whether area or environmental heterogeneity is more relevant in determining …
WebThe ‘sars’ (species–area relationships) package has been programmed using standard S3 methods and is available on CRAN (version 1.2.1) and the development version on GitHub (txm676/sars), meaning researchers can easily add in their own models and functions and integrate these into the multi-model inference framework. request for dcyf recordsWebTo this end, we provide a set of functions for fitting six piecewise regression models to SAR data, calculating confidence intervals around the breakpoint estimates (for certain models), comparing the models using various information criteria, and … proportional relationship grade 7Web1 de fev. de 2012 · Over most scales of space, ISARs are best represented by the power model and other simple models, while more complex, sigmoid models may be … proportional relationship example problemsWebA total of 248 specimens were analyzed 104 of Triportheus albus (25 preflexion, 18 flexion, 45 postflexion, and 16 juveniles) and 143 of T. angulatus (46 preflexion, 54 flexion, 13 postflexion, and 30 juveniles). Yolk sac larvae of both species were not found during sampling. Individuals in the early stages, such as preflexion and flexion, were captured … request for dbs credit card fee waiverWeb10 de abr. de 2024 · The piecewise regression (PWR) model detected two main clusters and indicated that increased temperatures trigger disease progression rapidly and severely. The PWR model used in this study also provided an example that can be used in the management and prediction of fungal diseases. request for disciplinary action uspsWebBased on 78 grassland fragments in fragmented landscapes of the agro-pastoral ecotone of northern China, we used piecewise regression, path analysis and null models to investigate the SIE of the species–area relationship. We then used a multi-model selection to evaluate the impacts of four influencing factors (instability, isolation, habitat ... request for deferred examinationWeb28 de dez. de 2024 · Fitting the continuous and left-horizontal piecewise models (particularly the two-threshold models) can be time consuming if the range in area is large and/or the interval argument is small. For the two-threshold continuous slope and left-horizontal models, the use of parallel processing (using the parallel argument) is … request for deed of sale