نتایج جستجو برای: guppy
تعداد نتایج: 615 فیلتر نتایج به سال:
Rana W. El-Sabaawi*, Eugenia Zandonà, Tyler J. Kohler, Michael C. Marshall, Jennifer M. Moslemi, Joseph Travis, Andrés López-Sepulcre, Regis Ferriére, Catherine M. Pringle, Steven A. Thomas, David N. Reznick and Alexander S. Flecker Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York 14853, USA; Department of Biology, Drexel University, Philadelphia, Pennsylvani...
DAPI staining of the metaphase chromosomes pretreated with barium hydroxide generates a C-like banding pattern. In this work a protocol for visualizing similar pattern at the synaptonemal complex (SC) spreads after immunostaining is suggested. This method was used to visualize centromeric and sex heterochromatin at the SC spreads of guppy fish (Poecilia reticulata Peters, 1859). The efficiency ...
Quantitative structure-toxicity relationships were developed for the prediction of aqueous toxicities for Poecilia reticulata (guppy) using the CODESSA treatment. A two-parameter correlation was found for class 1 toxins with R(2) = 0.96, and a five-parameter correlation was found for class 2 toxins with R(2) = 0.92. A five-parameter correlation for class 3 toxins had R(2) = 0.85. The correlatio...
Livebearer poeciliids, with few exceptions, are among the most popular and highly traded ornamental fish species. Therefore, they frequently introduced to natural waters outside their native range mostly by aquarium hobbyists. Here we report feral populations of two exotic poecilid species, swordtail (Xiphophorus hellerii) guppy (Poecilia reticulata), established in a hot spring Eastern Turkey....
Well-studied model systems present ideal opportunities to understand the relative roles of contemporary selection versus historical processes in determining population differentiation and speciation. Although guppy populations in Trinidad have been a model for studies of evolutionary ecology and sexual selection for more than 50 years, this work has been conducted with little understanding of t...
Similar to the ‘guppy effect’ identified in Osherson & Smith (1981), Hampton (1988a,b) measures substantial deviations from classical fuzzy set and probability models for membership weights for conjunction and disjunction, and calls them respectively ‘overextension’ and ‘underextension’. Introducing two quantities, ‘the minimum or maximum rule deviation’, denoted ∆, and ‘the Kolmogorovian facto...
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