نتایج جستجو برای: variable ecological components

تعداد نتایج: 729860  

2009
Catherine Allan Robyn J. Watts Darren S. Ryder

In this chapter we reflect on a relatively small but influential example of adaptive management which seeks to enhance the environmental benefits of the flow regime in the highly regulated Mitta Mitta River in Australia’s MurrayDarling Basin. In 1999 an operational review recommended the reintroduction of greater in-stream flow variability in the Mitta Mitta River in an attempt to improve river...

2014
Patricia A Soranno Kendra S Cheruvelil Edward G Bissell Mary T Bremigan John A Downing Carol E Fergus Christopher T Filstrup Emily N Henry Noah R Lottig Emily H Stanley Craig A Stow Pang-Ning Tan Tyler Wagner Katherine E Webster

© The Ecological Society of America www.frontiersinecology.org M environmental problems cannot be adequately addressed by viewing them through a single lens, be it narrow or broad, because ecological interactions often cross boundaries of scale or levels of organization (Peters et al. 2011). Cross-scale interactions (CSIs) occur when driver and response variables in cause–effect relationships o...

Journal: :Entropy 2017
Christopher R. Stephens Victor Sánchez-Cordero Constantino González-Salazar

The characterization and quantification of ecological interactions and the construction of species’ distributions and their associated ecological niches are of fundamental theoretical and practical importance. In this paper, we discuss a Bayesian inference framework, which, using spatial data, offers a general formalism within which ecological interactions may be characterized and quantified. I...

2017
James D. Nichols Mitchell J. Eaton Julien Martin

A conceptual framework is provided for considering the threshold concept in natural resource management and conservation. We define three kinds of thresholds relevant to management and conservation. Ecological thresholds are values of system state variables at which small changes bring about substantial or specified changes in system dynamics. They are frequently incorporated into ecological mo...

2014
Sander Uijlen Bas Westerbaan

At the heart of the Conway-Kochen Free Will Theorem and Kochen and Specker’s argument against non-contextual hidden variable theories is the existence of a Kochen-Specker (KS) system: a set of points on the sphere that has no {0,1}-coloring such that at most one of two orthogonal points are colored 1 and of three pairwise orthogonal points exactly one is colored 1. In public lectures, Conway en...

2006
J. Anthony Stallins

The interaction of geomorphic and ecologic landscape components has been largely conceptualized as independent. In one direction, geomorphic processes and landforms shape the distribution of biota. Conversely, in the other direction, biota modify geomorphic processes and landforms. Increasingly, the interactions between geomorphic and ecological components are more circular and developmentally ...

2005
D. Irschick

Although the concept of specialization has played a central role in the development of ecological and evolutionary theory, important questions about specialization remain largely unanswered. We argue that the traditional division of specialization into evolutionary and ecological factors may be less useful than considering specialization as three components, which may not be mutually exclusive:...

The current study was conducted in the rangeland of Glandrood watershed in the province of Mazandaran. The main objective of this study was to investigate the responses of forbs species to some environmental gradients. For these purpose 153 plots of 1m2 were established along the altitude gradient and Trasp. The sampling method was randomized-systematic. In the area sampled, frequency of forbs ...

2016
Evgeny A Kurashov Elena V Fedorova Julia V Krylova Galina G Mitrukova

The paper focuses on the assessment of the spectrum of biological activities (antineoplastic, anti-inflammatory, antifungal, and antibacterial) with PASS (Prediction of Activity Spectra for Substances) for the major components of three macrophytes widespread in the Holarctic species of freshwater, emergent macrophyte with floating leaves, Nuphar lutea (L.) Sm., and two species of submergent mac...

1956
A. Gilchrist M. D. Reid

We demonstrate a contradiction of quantum mechanics with local hidden variable theories for continuous quadrature phase amplitude (“position” and “momentum”) measurements. For any quantum state, this contradiction is lost for situations where the quadrature phase amplitude results are always macroscopically distinct. We show that for optical realizations of this experiment, where one uses homod...

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