Revisions of the Fish Invasiveness Screening Kit (FISK) for its Application in Warmer Climatic Zones,with Particular Reference to Peninsular Florida

The initial version (v1) of the Fish Invasiveness Scoring Kit (FISK) was adapted from the Weed Risk Assessment of Pheloung, Williams, and Halloy to assess the potential invasiveness of nonnative freshwater fishes in the United Kingdom. Published applications of FISK v1 have been primarily in temperate‐zone countries (Belgium, Belarus, and Japan), so the specificity of this screening tool to that climatic zone was not noted until attempts were made to apply it in peninsular Florida. To remedy this shortcoming, the questions and guidance notes of FISK v1 were reviewed and revised to improve clarity and extend its applicability to broader climatic regions, resulting in changes to 36 of the 49 questions. In addition, upgrades were made to the software architecture of FISK to improve overall computational speed as well as graphical user interface flexibility and friendliness. We demonstrate the process of screening a fish species using FISK v2 in a realistic management scenario by assessing the Barcoo grunter Scortum barcoo (Terapontidae), a species whose management concerns are related to its potential use for aquaponics in Florida. The FISK v2 screening of Barcoo grunter placed the species into the lower range of medium risk (score = 5), suggesting it is a permissible species for use in Florida under current nonnative species regulations. Screening of the Barcoo grunter illustrates the usefulness of FISK v2 as a proactive tool serving to inform risk management decisions, but the low level of confidence associated with the assessment highlighted a dearth of critical information on this species.     

THE STRENGTH OF WEAK INDICATORS: A Response to Gilles, Brown, Geletta, and Dalecki

This article responds to Gilles, Brown, Geletta, and Dalecki's (1990) claim that the Legitimate Violence Index (LVX) is invalid because of problems with eight of its twelve indicators and because it is confounded with region and population density.     

What’s happening to the family? Interactions between demographic and institutional change

As soon as men and women … acquire the habit of weighing the individual advantages and disadvantages of any prospective course of action … they cannot fail to become aware of the heavy personal sacrifices that family ties and especially parenthood entail under modern conditions. (Schumpeter 1988/1942, pp. 501–502)     

Becoming Self-Employed

This study explored how persons become self-employed. In critical incident interviews (Flanagan, 1954) with 5 self-employed persons, the critical events that assisted or hindered progress toward self-employment were elicited in chronological order. First, the 108 incidents were organized into 22 categories. Next, using the chronological order of categories of events, 2 basic patterns or plots for becoming self-employed were identified. Last, 8 distinctive themes of personal progress in the patterns were described. In general, becoming self-employed involved establishing conditions of action that enhanced a sense of agency, enabling each person to make a decision.     

Return Migrations of African‐Americans to the South: Reclaiming a Land of Promise,Going Home,or Both?*

Abstract Using samples of census data from the University of Minnesota Population Center's “Integrated Public Use Microdata Series” (IPUMS), we describe trends in African‐American migration to the South across recent decades, and explore the applicability of the concept of “return migration” to various demographic patterns. Our findings suggest that the return movement contains multiple migration streams involving African‐Americans of higher socio‐economic status (compared with both origin and destination populations) moving to both urban and rural destinations. These patterns represent clear differences from the earlier 20^th century's “Great Migration” of African‐Americans from South to North. The recent return migration streams suggest that the South may be replacing the North as a “land of promise” for some upwardly mobile African‐Americans, and may also reflect what Carol Stack (1996) has termed a “call to home” as a motivating factor shaping recent African‐American migration to the rural South.     

Planning for a university,using interactive forecasting

The benefits of programme review, forward planning and control have been demonstrated at the university-wide level. Within a faculty or department, there is also a clear need for developing and using planning methods which are rationally based and forward looking if appropriate responses to changing social and academic trends are to be made. This paper delineates a number of planning and control variables encountered at the faculty or departmental level, describes the development and use of a computer-based interactive forecasting model, and discusses the advantages and limitations of such models in planning a faculty's progress toward its goals.     

A simulation tool for modeling the influence of anatomy on information flow using discrete integrate and fire neurons

There are theories on brain functionality that can only be tested in very large models. In this work, a simulation model appropriate for working with large number of neurons was developed, and Information Theory measuring tools were designed to monitor the flow of information in such large networks. The model’s simulator can handle up to one million neurons in its current implementation by using a discretized version of the Lapicque integrate and fire neuron instead of interacting differential equations. A modular structure facilitates the setting of parameters of the neurons, networks, time and most importantly, architectural changes. Applications of this research are demonstrated by testing architectures in terms of mutual information. We present some preliminary architectural results showing that adding a virtual analogue to white matter called “jumps” to a simple representation of cortex results in: (1) an increase in the rate of mutual information flow, corresponding to the “bias” or “priming” hypothesis; thereby giving a possible explanation of the high speed response to stimuli in complex networks. (2) An increase in the stability of response of the network; i.e. a system with “jumps” is a more reliable machine. This also has an effect on the potential speed of response.     

Unmarried Motherhood: Recent Trends,Composition, and Black-White Differences

The National Survey of Family Growth (1982) is used to examine the extent to which racial differences in premarital birth rates can be explained by differences in parents' socioeconomic status, family structure, and residential characteristics. The findings document a large diversity in premarital births within both populations. Black women from high-risk backgrounds are three times more likely to have a premarital birth than black women from low-risk backgrounds. Racial differences in premarital births arise because (1) black women are more likely to come from high-risk backgrounds and (2) black women from low-risk backgrounds are more likely to have a premarital birth than white women with similar characteristics. There are similar rates of premarital births by race among persons from high-risk backgrounds.