Protected area characteristics that help waterbirds respond to climate warming

Protected area networks help species respond to climate warming. However, the contribution of a site's environmental and conservation-relevant characteristics to these responses is not well understood. We investigated how composition of nonbreeding waterbird communities (97 species) in the European Union Natura 2000 (N2K) network (3018 sites) changed in response to increases in temperature over 25 years in 26 European countries. We measured community reshuffling based on abundance time series collected under the International Waterbird Census relative to N2K sites’ conservation targets, funding, designation period, and management plan status. Waterbird community composition in sites explicitly designated to protect them and with management plans changed more quickly in response to climate warming than in other N2K sites. Temporal community changes were not affected by the designation period despite greater exposure to temperature increase inside late-designated N2K sites. Sites funded under the LIFE program had lower climate-driven community changes than sites that did not received LIFE funding. Our findings imply that efficient conservation policy that helps waterbird communities respond to climate warming is associated with sites specifically managed for waterbirds.     

瑞典沿岸水域濒临消失的大叶藻(Zostera Marina,L.)

在瑞典斯卡格拉克海峡沿岸,大叶藻(Zostera marina)是一种生长在浅水软海底上的优势显花植物.大叶藻场是许多甲壳动物和鱼类,不管是洄游种或是稳定种的重要群落生境.在20世纪80年代期间,作为海岸带管理的基础,对瑞典西海岸有大叶藻生长的沿岸浅水区的资源进行了调查.在这次研究中我们再次考察了斯卡格拉克海峡200km沿岸的5个沿海地区中的2000hm2大叶藻场.资源调查的方法(水下测量镜)与80年代的一样,但通过使用全球定位系统(GPS)增加了绘图的精确度.这次研究的结果表明,在10～15年的时间里,大叶藻的区域延伸面积减少了58%,且地区变化很大.大叶藻的减少主要限于大叶藻场的浅水部分.本文探讨了原因和生态后果.     

Mapping and Eradication Prioritization Modeling of Red Sesbania (Sesbania punicea) Populations

Red sesbania is an invasive South American shrub that has rapidly expanded its range along California waterways, emphasizing the need to prioritize eradication sites at a regional scale. To accomplish this, we updated baseline location data in summer 2010 using field surveys throughout the state. We collected relevant GPS attribute data for GIS analysis and eradication prioritization modeling. The regional survey identified upstream and downstream extents for each watershed, as well as outliers in urban areas. We employed the Weed Heuristics: Invasive Population Prioritization for Eradication Tool (WHIPPET) to prioritize red sesbania sites for eradication, and revised the WHIPPET model to consider directional propagule flow of a riparian species. WHIPPET prioritized small populations isolated from larger infestations, as well as outliers in residential areas. When we compared five experts’ assessments of a stratified sample of the red sesbania populations to WHIPPET’s prioritization results, there was a positive, but nonsignificant, correlation. The combination of WHIPPET and independent expert opinion suggests that small, isolated populations and upstream source populations should be the primary targets for eradication. Particular attention should be paid to these small populations in watersheds where red sesbania is a new introduction. The use of this model in conjunction with evaluation by the land manager may help prevent the establishment of new seed sources and protect uninfested riparian corridors and their adjacent watersheds.     

Kinetics of photocatalytic oxidation of trace organic compounds over titanium dioxide

The 350 nm UV-illuminated slurries of titanium dioxide were used to study the photocatalyzed degradation kinetics of dissolved organic carbon (DOC) as water contaminants. The initial rate data were well described by the Langmuir-Hinshelwood rate equation and the simplified Langmuir-Hinshelwood rate equation (i.e., ln(C₀/C)=K′t). The latter will be more easily used for predicting the degradation of DOC concentration at various elapsed times. In different DOC initial concentrations the apparent first-order rate constant (K′) decreased and half-life increased when the initial DOC concentration decreased. The Langmuir-Hinshelwood rate form will be the most convenient to describe the oxidation rate of DOC in the drinking water resources, if it is as brief as v=kKC.     

Unusual sonographic features of ARPKD

The classic sonographic appearance of the kidneys in fetuses with autosomal recessive polycystic kidney disease (ARPKD) has been well described. We report a case of enlarged kidneys with pyramidal hyperechogenicity quite similar to medullary nephrocalcinosis found in a fetus at 34 weeks' gestation. At 39 weeks, a female neonate was delivered and died after 22 h due to pulmonary insufficiency secondary to severe oligohydramnios. On pathological analysis, the gross and microscopic findings were typical of ARPKD with diffuse dilatation of tubules throughout. The fetal renal lobulation was prominent and on section, the pyramids were delineated within each lobule, accounting for the clear image of the pyramids observed on sonography. Copyright © 2006 John Wiley & Sons, Ltd.     

Insider or outsider? how employee perceptions of insider status affect their work behavior

Many researchers have used the insider–outsider distinction when discussing employment relationships (e.g., Graen & Scandura, 1987; Pfeffer & Baron, 1988). However, there is no known empirical research directly assessing employees' perceptions of their status as organizational insiders. This article is intended as an initial step to theoretically and empirically explore the concept of perceived insider status (PIS). First, we build theoretical arguments describing how organizations may differentiate between insider and outsider employees, leading to differences in perceptions of insider status. We then hypothesize and show empirical evidence that contrasts, but relates, actual inclusion and perceived organizational support to PIS. We subsequently examine two types of discretionary employee behavior, altruism and production deviance, as potential consequences of PIS. Our results suggest that both actual inclusion, as well as perceived insider status, have implications for organizational functioning via discretionary employee behaviors. Copyright © 2002 John Wiley & Sons, Ltd.