scholarly journals Species-specific factors affecting predator-prey interactions of the copepod Acanthocyclops vernalis with its natural prey

1979 ◽  
Vol 24 (4) ◽  
pp. 613-626 ◽  
Author(s):  
Judith L. Li ◽  
Hiram W. Li
2019 ◽  
Vol 239 (4) ◽  
pp. 661-701 ◽  
Author(s):  
Sandra Dummert ◽  
Ute Leber ◽  
Barbara Schwengler

AbstractThe current situation in the German apprenticeship market is characterized by two contradictory developments. On the one hand, establishments are experiencing increasing problems filling the training positions they offer, and the number of vacant training positions is climbing. On the other hand, the transition into training is still difficult for many young people, and the number of unsuccessful vocational training applicants is rising. Hence, matching supply with demand is becoming increasingly difficult in the German job market for training positions. Using the Linked Employer-Employee dataset (LIAB) from the Institute for Employment Research (IAB), our paper provides a closer examination of the phenomenon of unfilled training positions. It presents an overview of the evolution of vacant training positions in eastern and western Germany and attempts to explain the number of vacancies by investigating the factors responsible for the establishments’ inability to fill their training positions. We assume that training position vacancies are due not only to internal company reasons such as firm size or the wage offer for apprentices but also to external conditions such as general regional factors. Therefore, our analysis also considers the situation on the demand side of the labor market within a region. The results of our multilevel mixed-effects estimations show that in addition to characteristics on the enterprise level, regional determinants also affect the share of vacant apprenticeships. With respect to establishment-related factors, mainly characteristics that describe the attractiveness of the firm prove to be important. With regard to regional-specific factors, we find that the availability of school leavers in a region in addition to the level of regional-sectoral competition impacts the recruiting success of establishments. Our analysis also shows that there are remarkable differences between eastern and western Germany concerning both the quantitative importance of unfilled training positions and the factors affecting them.


2014 ◽  
Vol 143 (5) ◽  
pp. 1073-1078 ◽  
Author(s):  
E. NAKATANI ◽  
T. NISHIMURA ◽  
B. ZHOU ◽  
H. KANEDA ◽  
S. TERAMUKAI ◽  
...  

SUMMARYThe objective of this study was to examine temporal and regional variations of sporadic Creutzfeldt–Jakob disease (sCJD) in a retrospective study using Japanese national surveillance data from 2001 to 2010. We calculated the incidence of sCJD by age and sex, derived the standardized incidence in each of the 47 prefectures, and performed spatial disease clustering analysis. The average annual incidence of sCJD was 1·026 per million in men (637 patients) and 1·132 per million in women (733 patients), a significant sex difference after adjustment for age (P = 0·001). The ratios of familial CJD to sCJD apparently increased between 2001–2005 and 2006–2010, possibly as a result of the nationwide introduction of genetic testing after 2006. Based on the data of 2006–2010, certain geographical clusters of sCJD were identified. The incidence of sCJD was higher in several specific prefectures compared to the national average. Thus, sCJD appears to have regional variations, suggesting the existence of genetic or region-specific factors affecting the incidence of the disease.


Paradigm ◽  
2021 ◽  
Vol 25 (2) ◽  
pp. 181-193
Author(s):  
Nitya Garg

Banking sector is the backbone of any economy, so it is necessary to focus on its performance which is largely affected by its non-performing assets (NPAs). In the year 2018–2019, NPA of scheduled banks was Rs 355,076 Crore which is 3.7% of net advances. The purpose of this study is to identify the determinants based on analysis from previous literatures, and majorly macroeconomic and bank specific factors which are affecting NPAs using the relative weight analysis and to frame a model to predict future NPAs using multiple regression model using SPSS. The study also attempts to focus on actions and remedies that banks should make to control future NPAs. Findings of the study will act as a scaffolding for financial analysts and policymakers to prevent the conversion of its performing assets into NPAs and also help in proper management of banks and also in the recovery of economy.


1983 ◽  
Vol 34 (6) ◽  
pp. 627-637 ◽  
Author(s):  
Gloria A. Smart ◽  
Marjorie Warrington ◽  
Dorothy Dellar ◽  
John C. Sherlock

Author(s):  
Roopjot Kochar ◽  
Harmanjot Kaur

Online shopping is a form of electronic commerce which allows consumers to directly buy goods or services from a seller over the Internet using a web browser. Online shopping provides a good example of business revolution. Ecommerce has made life Simple and innovative of individual and groups. Consumer behavior on online shopping is different from physical market where he/she has access to see the products online shopping sites are fast replacing traditional or physical shops. Over, the years the trust of the customers for online shopping sites has increased considerably. The increase in the number of these sites on one hand has led to a fierce competition which means better and cheaper products for customers. However, at the same time customers have their privacy concerns when it comes to shopping online. Internet is changing the way consumers shop and buy goods and services and has rapidly evolved into a global phenomenon. The technology oriented factors like guaranteed quality, cash on delivery discounts and promotions are the major specific factors influencing customer’s attitudes toward online shopping. This research paper attempts to analyze the consumer behavior towards online shopping and the various factors influencing trend of online shopping.


2022 ◽  
Vol 14 (2) ◽  
pp. 890
Author(s):  
Vesna Oražem ◽  
Aleksandra Majić Skrbinšek ◽  
Andrej Šorgo ◽  
Iztok Tomažič

Teaching in a formal learning environment mainly focuses on gaining knowledge, and scarcely on the development of pro-environmental attitudes. Knowledge can also be gained in informal learning institutions, such as zoos, and their potential use in general public education should not be neglected. This paper explores factors influencing the conservation beliefs of zoo visitors about brown bears, grey wolves, and Eurasian lynx. The study undertaken in Zoo Ljubljana (Slovenia) consisted of surveys performed in 2009 (n = 613) and in 2021 (n = 257). The levels of knowledge and education influenced both supporting and opposing beliefs about the three large carnivore species. The gender factor was less uniform: both supporting and opposing beliefs about lynx were demonstrated, but only opposing beliefs about brown bear and wolf. The study indicates that knowledge has the most significant influence on conservation beliefs, thus highlighting the importance of educational and communication activities in management and conservation actions regarding large carnivore species. The varied gender influence suggests that species-specific educational activities should be encouraged.


2021 ◽  
Vol 30 (3) ◽  
pp. 259-268
Author(s):  
KA Fletcher ◽  
LJ Cameron ◽  
M Freeman

Traditionally, assessment of animal welfare generally focused on physiological signs of health with less consideration of psychological well-being. More recently, the Five Domains model highlighted the concept of all aspects of an animal's life influencing their affective state. In equestrianism, however, there is a lack of awareness of the Five Domains model and, specifically, how different factors may affect the mental well-being of horses (Equus caballus). This divide between scientific research and lay horse owners could compromise equine welfare by failing to recognise horses as sentient beings with species-specific needs. The present study therefore aimed to explore how evidence-based information can be effectively communicated to equestrians (n = 259) through an online survey and whether increased knowledge of equine welfare needs has any impact on horse caregivers' assessment of their own horses' quality of life. Results showed that a simple educational infographic based on the Five Domains model had a significant impact on equestrians' assessment of equine welfare, although longitudinal, empirical studies are needed. Scores on a Likert scale for health, behaviour/human interactions and overall welfare were significantly lower following the intervention but scores for emotional well-being were significantly higher. This may suggest that, whilst the infographic increased participant awareness of the importance of emotional state and the factors affecting welfare, there were difficulties or inconsistencies in objectively assessing these emotions. This highlights the need for equine welfare science to be communicated more proactively to horse owners in an accessible, engaging format.


2004 ◽  
Vol 36 (3) ◽  
pp. 639-655 ◽  
Author(s):  
R. Wes Harrison ◽  
Pramod R. Sambidi

A national survey of broiler industry executives is conducted to analyze site-specific factors related to the broiler-complex location problem. Conjoint analysis is used to analyze the broiler complex location decision. Feed costs, community attitude toward the broiler industry, availability of geographically concentrated growers, unemployment rates, and wage rates were found to be the top five factors affecting broiler company location decisions. The quality of roads between feed mill and growers; electricity, heating, water, and sewage costs; and the number of potential growers in the region were also found to be important.


1994 ◽  
Vol 61 (1) ◽  
pp. 91-99 ◽  
Author(s):  
Didier Levieux ◽  
Annie Venien

SummaryA sandwich ELISA (enzyme-linked immunosorbent assay) of the two-site type has been successfully developed for the detection of cows' milk in goats' or ewes' milk. The assay uses two monoclonal antibodies (MAb) raised in mice against cows' β-lactoglobulin (β-lg). These MAb recognize different epitopes of the β-lg, which are sufficiently distinct to allow simultaneous binding of the corresponding antibodies. One of the MAb recognizes a species-specific epitope of the bovine β-lg and was adsorbed to a plastic microtitration plate (capture antibody). The second MAb was labelled with peroxidase and used to detect the captured cows' β-lg. Factors affecting assay performance were investigated. The optimized assay is highly specific, reproducible (intra- and inter-assay CV were 8 and 13% respectively) and sensitive: as little as 5 ng β-lg/ml or 1 part cows' milk per 100000 parts goats' or ewes' milk can be detected. The technique is robust, cheap, rapid, reliable and suitable for high sample throughput, semi-automation and screening surveys. The MAb used guarantee the high specificity of the assay and indefinite reagent supply of constant quality once approved by collaborative national or international trials.


2015 ◽  
Vol 282 (1812) ◽  
pp. 20150973 ◽  
Author(s):  
Daniel Fortin ◽  
Pietro-Luciano Buono ◽  
Oswald J. Schmitz ◽  
Nicolas Courbin ◽  
Chrystel Losier ◽  
...  

Trophic interactions in multiprey systems can be largely determined by prey distributions. Yet, classic predator–prey models assume spatially homogeneous interactions between predators and prey. We developed a spatially informed theory that predicts how habitat heterogeneity alters the landscape-scale distribution of mortality risk of prey from predation, and hence the nature of predator interactions in multiprey systems. The theoretical model is a spatially explicit, multiprey functional response in which species-specific advection–diffusion models account for the response of individual prey to habitat edges. The model demonstrates that distinct responses of alternative prey species can alter the consequences of conspecific aggregation, from increasing safety to increasing predation risk. Observations of threatened boreal caribou, moose and grey wolf interacting over 378 181 km 2 of human-managed boreal forest support this principle. This empirically supported theory demonstrates how distinct responses of apparent competitors to landscape heterogeneity, including to human disturbances, can reverse density dependence in fitness correlates.


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