s p o n s o r e d   l i n k s

Search

Your search yielded no results

  • Check if your spelling is correct.
  • Remove quotes around phrases to match each word individually: "blue smurf" will match less than blue smurf.
  • Consider loosening your query with OR: blue smurf will match less than blue OR smurf.

Ebook Intraspecific competition affects the strength of individual specialization: an optimal diet theory method

Many apparently generalist populations are in fact composed of relatively specialized individuals (Bolnick et al., 2003). For example, the Cocos finch, Pinaroloxias inornata, uses a broad range of resources including insects, fruits and flower nectar (Werner and Sherry, 1986). This diet diversity spans a range of resources normally characteristic of disparate families of birds. In contrast, individual finches tend to specialize on one particular foraging strategy (Werner and Sherry, 1986). Such individual specialization has important implications for both ecological interactions and evolutionary processes, including polymorphism and speciation (Bolnick et al., 2003). However, very little is known about the mechanistic basis for diet variation. In particular, why would a group of conspecific individuals, faced with the same set of available resources, select different diets?.

To effectively address the basis of intra-population diet variation, one must first consider the factors determining diet selection of a single individual. This classic topic in individual ecology is most often addressed via optimal diet theory (ODT) (Schoener, 1971; Pulliam, 1974; Werner, 1974), which wasdeveloped to explain why an individual forager might select a restricted diet, when a range of potentially profitable resources is available. The theory proposes that an individual selects a particular foraging strategy to maximize some currency related to fitness, such as the rate of energy income. This rate depends on the energetic content of alternative prey, encounter rates, and how effective the forager is at detecting, capturing, handling and digesting the prey. The forager should drop any food type whose energetic value is less than the expected energetic return for foregoing that item to search for more profitable prey. Optimal diet theory has been fairly successful, allowing qualitative and often even quantitative predictions of individuals’ diets in many systems (Sih and Christensen, 2001), though it has also been subjected to extensive criticism (Pierce and Ollason, 1987; Bunnell and Harestad, 1990; Ward, 1992; Sih and Christensen, 2001).

Ebook Central Oregon Economic Activity & Business Condition Analysis

In a world without crystal balls, there are few reliable tools for economists to predict future economic activity. As a response to the desire of politicians, business leaders, and the general public to have information regarding the future business climate, economists have developed forecasting tools such as indexes of economic activity. These indexes, which track the combined activity of a series of indicators over time, have been developed with the goal of forecasting future activity. Former Vice President of the Conference Board, Edgar R. Fiedler approaches the subject of precision in forecasting within his paper The Future Lies Ahead. He describes economic forecasting as a maddening occupation that is always fascinating, exciting and rewarding; a profession that is regularly exasperating, infuriating, and occasionally even deranging. In our own experience of building an index for Central Oregon, we have come largely to the same conclusion. Yet as Fiedler remarks, forecasting, no matter by what method it is done, is an intrinsic part within every community’s decision process.

Philip Klein, Professor of Economics at Penn State University identifies the two most prominent current forecasting techniques to be the leading indicator method and the construction and interpretation of econometric models. These two camps of thought have at times battled with one another for higher ground in the economic literature. However, it now appears that a consensus has been reached that these two techniques can be complementary, as they can together assist in the complex task of monitoring business cycle developments. According to Klein, the public has the right to be skeptical over predictions of the future when no one has certain knowledge about the future, or even of the present. In fact, much of the knowledge of the recent past is incomplete at best. In light of this, the saying that “an imprecise forecast is better than none” has much value. Indeed, in our review of the economic literature, it seems that all agree that the current system of forecasting economic activity using indexes of leading indicators, while flawed, is still the best available option.

PDF Ebook Adobe InDesign CS3 Scripting Tutorial

Scripting is the most powerful feature in Adobe? InDesign? CS3. No other feature can save you as much time, trouble, and money as scripting. This document is for every InDesign user. If you never created a script before, we show you how to get started. If you wrote scripts for other applications, we show you how to apply your knowledge to InDesign scripting.

The document also covers how to install and run an InDesign script and describes what InDesign scripting can and cannot do. We discuss the software you need to start writing your own scripts. After you learn the basics of InDesign scripting in this tutorial, you can move on to Adobe InDesign CS3 Scripting Guide, which explores scripting in more depth.

Search term

Get Updates By Email:

Enter your email address:

Delivered by FeedBurner