Factors affecting clutch Size and Duckling Survival in the Common GoldeneyeBucephala clangula

1998 ◽  
Vol 4 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Markku Milonoff ◽  
Hannu Pöysä ◽  
Pentti Runko
Keyword(s):  
Clutch Size ◽  
Factors Affecting ◽  
Duckling Survival ◽  
The Common

Parental care in the common eider (Somateria mollissima): factors affecting abandonment and adoption of young

1991 ◽  
Vol 69 (6) ◽  
pp. 1538-1545 ◽  
Author(s):  
Jan O. Bustnes ◽  
Kjell E. Erikstad
Keyword(s):  
Parental Care ◽  
Somateria Mollissima ◽  
Factors Affecting ◽  
Lower Survival Rate ◽  
Duckling Survival ◽  
Energetic Stress ◽  
Lower Body Weight ◽  
Common Eiders ◽  
The Common ◽  
Individual Strategies

Parental care in common eiders (Somateria mollissima) was studied during three field seasons in northern Norway. Forty-two percent of the females were found to abandon their brood. Abandonment and tending of broods and crèches were not obligate individual strategies, but changed between years. Females abandoning their young laid smaller clutches and had a lower body weight at hatching than brood- and crèche-tending females, indicating that they were in poor body condition. This supports the hypothesis that abandoning the brood is a salvage strategy in which energetic stress limits females' ability to care for their young. Young of "abandoners" seemed to have a lower survival rate than young of "tenders," which suggests a reproductive cost of abandoning the young. Forty-seven percent of tagged ducklings were found with females other than their mother. Twenty-seven percent of the brood- and crèche-tending females lost young to other females, but never more than one duckling. Adoptions of foreign ducklings, above the normal brood size of four, did not lead to greater parental effort, and duckling survival was similar among broods and crèches of different sizes. This suggests that adoptions may be of neutral adaptive value. Two females often formed stable crèches, but duckling survival was not significantly different from that in broods and crèches with single females.

scholarly journals Understanding Urban Commercial Vehicle Driver Behaviors and Decision Making

2021 ◽  
pp. 036119812110035
Author(s):  
Giacomo Dalla Chiara ◽  
Klaas Fiete Krutein ◽  
Andisheh Ranjbari ◽  
Anne Goodchild
Keyword(s):  
Commercial Vehicle ◽  
Operating Time ◽  
Common Belief ◽  
Policy Makers ◽  
Factors Affecting ◽  
Urban Freight ◽  
The Road ◽  
Commercial Drivers ◽  
The Common ◽  
Printed Materials

As e-commerce and urban deliveries spike, cities grapple with managing urban freight more actively. To manage urban deliveries effectively, city planners and policy makers need to better understand driver behaviors and the challenges they experience in making deliveries. In this study, we collected data on commercial vehicle (CV) driver behaviors by performing ridealongs with various logistics carriers. Ridealongs were performed in Seattle, Washington, covering a range of vehicles (cars, vans, and trucks), goods (parcels, mail, beverages, and printed materials), and customer types (residential, office, large and small retail). Observers collected qualitative observations and quantitative data on trip and dwell times, while also tracking vehicles with global positioning system devices. The results showed that, on average, urban CVs spent 80% of their daily operating time parked. The study also found that, unlike the common belief, drivers (especially those operating heavier vehicles) parked in authorized parking locations, with only less than 5% of stops occurring in the travel lane. Dwell times associated with authorized parking locations were significantly longer than those of other parking locations, and mail and heavy goods deliveries generally had longer dwell times. We also identified three main criteria CV drivers used for choosing a parking location: avoiding unsafe maneuvers, minimizing conflicts with other users of the road, and competition with other commercial drivers. The results provide estimates for trip times, dwell times, and parking choice types, as well as insights into why those decisions are made and the factors affecting driver choices.

Factors Affecting Clutch Size in the Teiid Lizards Cnemidophorus tigris gracilis and C. t. septentrionalis

1992 ◽  
Vol 26 (4) ◽  
pp. 443 ◽  
Author(s):  
Harry L. Taylor ◽  
Christopher R. Cooley ◽  
Rose Ann Aguilar ◽  
Carmeliza J. Obana
Keyword(s):  
Clutch Size ◽  
Factors Affecting

scholarly journals Factors affecting the motivation of Chemistry university students

2013 ◽  
Vol 1 (1) ◽  
pp. 3-16
Author(s):  
Johanna Havia
Keyword(s):  
University Students ◽  
Group Formation ◽  
Self Determination Theory ◽  
Self Determination ◽  
Motivation To Learn ◽  
Laboratory Practice ◽  
Factors Affecting ◽  
Research Results ◽  
Chemistry Students ◽  
The Common

As a part of this research, a survey and four student interviews were done on the motivation of chemistry students of University of Oulu. The aim was to find out the formation of motivation, and seek factors that affect the students’ motivation to study chemistry. The survey measured the inner motivation, outer motivation and lack of motivation based on self-determination theory. The most common aspect of motivation among the students was the inner motivation to learn more about chemistry. Among the common aspects were also the aspects of outer motivation: outside regulation and benefit. By interviewing four of the students, a deeper understanding of the factors behind motivation was sought. Among the positive factors were the parallel lectures and laboratory practices, and including recent research results into teaching. The significance of laboratory practice was the most evident factor. Among the factors reducing motivation were problems with group formation, unclear issues and lectures where everything was readily given. By paying attention to group formation, motivation to study could be increased relatively easily.

scholarly journals Exploration of Factors Affecting Learners' Motivation in E-learning

2019 ◽  
pp. 1269-1275
Author(s):  
Shubham Dubey ◽  
Biro Piroska ◽  
Manjulata Gautam
Keyword(s):  
Dropping Out ◽  
Individual Factor ◽  
Factors Affecting ◽  
E Learning ◽  
Learning Platforms ◽  
The Common ◽  
Khan Academy ◽  
Future Work ◽  
The Impact

The world is changing rapidly, so is academics. E-learning has altered the area of academics and education. ICT enabled learning has given ideal services to students by providing any type of content on demand which is proportional to the performance of students. The concentration of learner has been found instinctive; thus there is a need of engaging mind towards course progress with its entirety till the objectives of the course will be achieved. There are several e-learning platforms available as EdX, Udacity, Khan Academy, Alison those have a number of learners registered for various courses. Studies suggest that these platforms suffer from the common problem of learners’ dropping out. Investigations also claim early leaving rate is increasing due to lack of quality of content, distraction factors, learners’ mind change, outdated and succinct information, and some more detraction factors. These issues have been observed on the basis of early leaving rates in various MOOCs. Thus there is a mammoth scope for minimizing the impact of these reasons on the learners’ mind. It can be achieved by identifying these factors affecting learners’ motivation during the course. This study is aiming on identifying these factors. The approach is to explore some certain keywords on previous literature (total 41) and then calculating their frequencies and co-factors associated with them. Both grouped factors contribution and individual factor contribution have been taken care. The study gives a direction for future work towards overcoming these actor and engaging learners in ICT enabled learning.

Catheters at home: managing urinary catheters in the home environment

2021 ◽  
Vol 26 (8) ◽  
pp. 370-376
Author(s):  
Drew Payne
Keyword(s):  
Emergency Department ◽  
Health Service ◽  
Literature Review ◽  
Home Environment ◽  
Negative Impact ◽  
Community Settings ◽  
Urinary Catheters ◽  
Factors Affecting ◽  
The Common ◽  
At Home

In England, there are some 90000 people with catheters in the community, and community nurses often have to manage catheter-related problems. This article looks at these common catheter problems found in the community, for example, blockage, infections and positioning problems. These problems were identified by a literature review and from the author's experience, from many years working in the community. It has been found that education, knowledge, empowerment and communication are vital factors affecting patients' ability to manager their catheters themselves. The article begins with a discussion about how patients can be involved in and manage many aspects of care for their own catheters. It goes on to talk about the common catheter-associated problems and how these can be avoided or addressed. It is hoped that better management of catheter-associated complications in the community settings can prevent unnecessary visits to the emergency department, which will save time and costs for the health service, as well as avoid the negative impact of these on patient lives.

Gut microbiota in a host–brood parasite system: insights from common cuckoos raised by two warbler species

2020 ◽  
Vol 96 (9) ◽  
Author(s):  
Lucie Schmiedová ◽  
Jakub Kreisinger ◽  
Milica Požgayová ◽  
Marcel Honza ◽  
Jean-François Martin ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Gut Microbiota ◽  
Acrocephalus Arundinaceus ◽  
Brood Parasite ◽  
Bacterial Strains ◽  
Factors Affecting ◽  
The Common ◽  
Animal Hosts ◽  
Bacterial Sources ◽  
Selection Of

ABSTRACT An animal's gut microbiota (GM) is shaped by a range of environmental factors affecting the bacterial sources invading the host. At the same time, animal hosts are equipped with intrinsic mechanisms enabling regulation of GM. However, there is limited knowledge on the relative importance of these forces. To assess the significance of host-intrinsic vs environmental factors, we studied GM in nestlings of an obligate brood parasite, the common cuckoo (Cuculus canorus), raised by two foster species, great reed warblers (Acrocephalus arundinaceus) and Eurasian reed warblers (A. scirpaceus), and compared these with GM of the fosterers’ own nestlings. We show that fecal GM varied between cuckoo and warbler nestlings when accounting for the effect of foster/parent species, highlighting the importance of host-intrinsic regulatory mechanisms. In addition to feces, cuckoos also expel a deterrent secretion, which provides protection against olfactory predators. We observed an increased abundance of bacterial genera capable of producing repulsive volatile molecules in the deterrent secretion. Consequently, our results support the hypothesis that microbiota play a role in this antipredator mechanism. Interestingly, fosterer/parent identity affected only cuckoo deterrent secretion and warbler feces microbiota, but not that of cuckoo feces, suggesting a strong selection of bacterial strains in the GM by cuckoo nestlings.

Exploring the common factors affecting the strategic plans in Iranian academic libraries

2020 ◽  
Vol 41 (4/5) ◽  
pp. 123-134
Author(s):  
Sirous Panahi ◽  
Hossein Ghalavand ◽  
Shahram Sedghi ◽  
Abdolahad Nabiolahi ◽  
Sedigheh Khani
Keyword(s):  
Academic Libraries ◽  
Academic Library ◽  
Common Factors ◽  
Organizational Factors ◽  
Personal Factors ◽  
Affecting Factors ◽  
Content Type ◽  
Factors Affecting ◽  
Strategic Plans ◽  
The Common

PurposeOne of the important processes for success or failure of strategic plans in academic libraries is identifying different dimensions and factors affecting library activities and services. However, more previous studies focusing on strategic planning processes and few research have explored perspectives of academic library managers in factors affecting designed strategic plans. This article aims to identify the common factors affecting the strategic plans in Iranian academic libraries.Design/methodology/approachAfter adopting a qualitative survey design, 28 Iranian academic library managers were interviewed. Purposive snowball sampling method was used to select the libraries’ managers, and the data analysis was done using the thematic analysis method by MAXQDA 10.FindingsThe study revealed three main themes including personal, professional and organizational factors that effect on academic libraries’ strategic plans. Users' expectations and librarians' personality characteristics were identified as two sub-themes for personal factors. In term of professional factors, scientific achievement of libraries and communication skills are the most important factors. Academicals factors, managerial factors and budget alignment are most important organizational factors that affect the Iranian academic libraries’ strategic plans.Originality/valueIranian academic libraries use different approaches for developing their strategic plans. However, by revealing the common affecting factors by academic library managers, the study provides an opportunity for better controlling the academic libraries' strategic plans progresses.

Antipredator behaviour of old-world tropical lizard, common agama Agama agama, in an urban environment

2019 ◽  
Vol 40 (3) ◽  
pp. 389-393
Author(s):  
Peter Mikula ◽  
Emma Nelson ◽  
Piotr Tryjanowski ◽  
Tomáš Albrecht
Keyword(s):  
Potential Effect ◽  
Antipredator Behaviour ◽  
Head Orientation ◽  
Adult Males ◽  
Escape Behaviour ◽  
Old World ◽  
Factors Affecting ◽  
The Common ◽  
Antipredator Strategy ◽  
Old World Tropics

Abstract Escape behaviour is a common antipredator strategy of lizards. Here, we studied the effect of several variables predicted to have a potential effect on escape behaviour of lizards. Specifically, we measured the effects of starting distance (SD), distance to cover, sex–age and the observer’s head orientation on flight initiation distance (FID) in the common agama Agama agama. Agamas were approached in urban localities in Limbe city, Cameroon, where they were habituated to the presence of humans. We found no association between FID and SD, but individuals closer to potential cover had shorter FID than individuals farther from a refuge. Juveniles escaped later than adults, but no significant differences were found in the FID between adult males and females. Head direction of the approaching observer had no effect on FID. This is, to the best of our knowledge, the first study investigating factors affecting FID in common agamas, extending our knowledge of risk-related behaviour in lizards of the Old World tropics.

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