نتایج جستجو برای: meadows

تعداد نتایج: 2563  

Journal: :The Journal of Symbolic Logic 2010

Journal: :CoRR 2009
Jan A. Bergstra Inge Bethke

Let Q0 denote the rational numbers expanded to a meadow by totalizing inversion such that 0 = 0. Q0 can be expanded by a total sign function s that extracts the sign of a rational number. In this paper we discuss an extension Q0(s, √ ) of the signed rationals in which every number has a unique square root.

2003
David Gutiérrez Rosa Menéndez Marcos Méndez

Quick biodiversity studies on poorly studied taxa and areas are increasingly popular for setting conservation priorities over a wide range of spatial scales. However, the implementation of such studies is complicated by the variable extent to which the different criteria used in prioritisation are correlated to each other. Using methods of constrained ordination, we examined the specieshabitat ...

2017
Steven R Lee Eric L Berlow Steven M Ostoja Matthew L Brooks Alexandre Génin John R Matchett Stephen C Hart

We evaluated the influence of pack stock (i.e., horse and mule) use on meadow plant communities in Sequoia and Yosemite National Parks in the Sierra Nevada of California. Meadows were sampled to account for inherent variability across multiple scales by: 1) controlling for among-meadow variability by using remotely sensed hydro-climatic and geospatial data to pair stock use meadows with similar...

2018
Abigail L. Scott Paul H. York Clare Duncan Peter I. Macreadie Rod M. Connolly Megan T. Ellis Jessie C. Jarvis Kristin I. Jinks Helene Marsh Michael A. Rasheed

Seagrass meadows support key ecosystem services, via provision of food directly for herbivores, and indirectly to their predators. The importance of herbivores in seagrass meadows has been well-documented, but the links between food webs and ecosystem services in seagrass meadows have not previously been made explicit. Herbivores interact with ecosystem services - including carbon sequestration...

Journal: :J. Log. Algebr. Meth. Program. 2015
Inge Bethke Pieter Hendrik Rodenburg Arjen Sevenster

A meadow is a commutative ring with a total inverse operator satisfying 0 = 0. We show that the class of finite meadows is the closure of the class of Galois fields under finite products. As a corollary, we obtain a unique representation of minimal finite meadows in terms of finite prime fields.

2017
Malie Lessard-Therrien Jean-Yves Humbert

Question: The biodiversity of mountain hay meadows has historically been maintained through traditional, low-intensity farming practices. In recent decades, however, agricultural intensification for hay production has led to dramatic declines in their biodiversity. This study asks: which management practices can contribute to maintaining the biodiversity value of mountain hay meadows without je...

Journal: :Ecology 2009
Daniel Fortin Marie-Eve Fortin Hawthorne L Beyer Thierry Duchesne Sabrina Courant Karine Dancose

For gregarious animals the cost-benefit trade-offs that drive habitat selection may vary dynamically with group size, which plays an important role in foraging and predator avoidance strategies. We examined how habitat selection by bison (Bison bison) varied as a function of group size and interpreted these patterns by testing whether habitat selection was more strongly driven by the competing ...

2015
Sébastien Nusslé Kathleen R. Matthews Stephanie M. Carlson Kyle A. Young

Rising temperatures due to climate change are pushing the thermal limits of many species, but how climate warming interacts with other anthropogenic disturbances such as land use remains poorly understood. To understand the interactive effects of climate warming and livestock grazing on water temperature in three high elevation meadow streams in the Golden Trout Wilderness, California, we measu...

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