scholarly journals The Relationship between Egg Size and Chick Size in the Laughing Gull and Japanese Quail

The Auk ◽  
1978 ◽  
Vol 95 (1) ◽  
pp. 135-144 ◽  
Author(s):  
Robert E. Ricklefs ◽  
D. Caldwell Hahn ◽  
William A. Montevecchi
Keyword(s):  
Japanese Quail ◽  
Dry Matter ◽  
Egg Size ◽  
Lipid Level ◽  
Body Proportion ◽  
Ecological Requirements ◽  
Stage Of Development ◽  
Low Levels ◽  
The Relationship ◽  
Chick Size

Abstract Variation in the water, lipid, and nonlipid dry matter of eggs and newly hatched chicks of the Laughing Gull and Japanese Quail was related to variation in the size of the egg. Egg contents of the two species were, on average, very similar. Yolk size varied in direct proportion to egg size, but in the quail large eggs contained disproportionately low levels of lipid and high levels of nonlipid dry matter. The composition of the newly hatched gull chick closely resembled that of the newly hatched quail. With increasing egg size, and thus chick size, water level increased and lipid level decreased in the gull chick, whereas lipid level increased in the quail chick. Among body organs, the integument of the gull exhibited a disproportionate increase with an increase in egg size, owing mostly to the accumulation of water; in the quail, the legs were the only organs to increase out of proportion to increase in body size. Disproportionate decreases in body proportion with increasing chick size appeared mostly in the head, stomach, and intestine components of both species. Variation in proportions of lipid and water in the chick related to egg size is discussed in terms of (1) ecological requirements of newly hatched chicks, (2) sibling competition within broods, and (3) stage of development of the young at hatching.

What Does Human Development Index Rating Mean in Terms of Individualism/Collectivism?

2003 ◽  
Vol 8 (2) ◽  
pp. 97-100 ◽  
Author(s):  
Maria José Sotelo ◽  
Luis Gimeno
Keyword(s):  
Human Development ◽  
Human Development Index ◽  
Principal Component ◽  
General Idea ◽  
Development Index ◽  
Low Levels ◽  
The Relationship

The authors explore an alternative way of analyzing the relationship between human development and individualism. The method is based on the first principal component of Hofstede's individualism index in the Human Development Index rating domain. Results suggest that the general idea that greater wealth brings more individualism is only true for countries with high levels of development, while for middle or low levels of development the inverse is true.

Ups and downs on the roller coaster of task conflict: the role of group cognitive complexity, collective emotional intelligence and team creativity

2020 ◽  
Vol 18 (1) ◽  
pp. 23-37
Author(s):  
Andreea Gheorghe ◽  
Oana Fodor ◽  
Anișoara Pavelea
Keyword(s):  
Emotional Intelligence ◽  
Cognitive Complexity ◽  
Empirical Support ◽  
Task Conflict ◽  
Team Creativity ◽  
Mediating Role ◽  
Low Levels ◽  
Explanatory Mechanism ◽  
The Relationship

This study explores the association between task conflict and team creativity and the role of group cognitive complexity (GCC) as a potential explanatory mechanism in a sample of 159 students organized in 49 groups. Moreover, we analyzed the moderating effect of collective emotional intelligence (CEI)in the relationship between task conflict and GCC.As hypothesized, we found that task conflict has a nonlinear relationship with GCC, but contrary to our expectations, it follows a U-shaped association, not an inversed U-shape. In addition,the moderating role of CEI was significant only at low levels. Contrary to our expectation, the mediating role of GCC did not receive empirical support. Theoretical and practical contributions are discussed.

Illicit Economies and Political Violence in Central Asia

2020 ◽  
Author(s):  
Lawrence P. Markowitz ◽  
Mariya Y. Omelicheva
Keyword(s):  
Central Asia ◽  
Political Violence ◽  
Drug Trade ◽  
Weak States ◽  
Collaborative Relationships ◽  
Organized Violence ◽  
Muslim Majority ◽  
Low Levels ◽  
The Relationship ◽  
Terrorist Violence

This chapter examines low levels of terrorist violence in Muslim-majority societies. Studies of terrorism have tended to view the relationship between religion and violence through the narrow lens of security, thereby overpredicting the extent of terrorist violence across societies. After reviewing the various explanations for terrorist violence, and applying them to Central Asia, this chapter explores the conditions under which a state’s involvement in illicit economies—specifically its collusion in the drug trade—can dampen levels of terrorist violence. Combining quantitative analysis (including GIS-enabled tools) with a series of in-depth expert interviews conducted in Central Asia, it emphasizes the complex political economy of security that defines infrastructurally weak states, where political and security apparatuses are often immersed in informal and illicit economies. This approach helps uncover the complex links between religion and organized violence, where state apparatuses are often drawn into collaborative relationships with nonstate actors.

scholarly journals Co-Occurrence of Regulated and Emerging Mycotoxins in Corn Silage: Relationships with Fermentation Quality and Bacterial Communities

Toxins ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 232
Author(s):  
Antonio Gallo ◽  
Francesca Ghilardelli ◽  
Alberto Stanislao Atzori ◽  
Severino Zara ◽  
Barbara Novak ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Communities ◽  
Dry Matter ◽  
Kojic Acid ◽  
Corn Silage ◽  
Fungal Metabolites ◽  
Fusarium Mycotoxins ◽  
Low Concentrations ◽  
Fermentation Quality ◽  
Low Levels

Sixty-four corn silages were characterized for chemicals, bacterial community, and concentrations of several fungal metabolites. Silages were grouped in five clusters, based on detected mycotoxins, and they were characterized for being contaminated by (1) low levels of Aspergillus- and Penicillium-mycotoxins; (2) low levels of fumonisins and other Fusarium-mycotoxins; (3) high levels of Aspergillus-mycotoxins; (4) high levels of non-regulated Fusarium-mycotoxins; (5) high levels of fumonisins and their metabolites. Altersetin was detected in clusters 1, 3, and 5. Rugulusovin or brevianamide F were detected in several samples, with the highest concentration in cluster 3. Emodin was detected in more than 50.0% of samples of clusters 1, 3 and 5, respectively. Kojic acid occurred mainly in clusters 1 and 2 at very low concentrations. Regarding Fusarium mycotoxins, high occurrences were observed for FB3, FB4, FA1, whereas the average concentrations of FB6 and FA2 were lower than 12.4 µg/kg dry matter. Emerging Fusarium-produced mycotoxins, such as siccanol, moniliformin, equisetin, epiequisetin and bikaverin were detected in the majority of analyzed corn silages. Pestalotin, oxaline, phenopirrozin and questiomycin A were detected at high incidences. Concluding, this work highlighted that corn silages could be contaminated by a high number of regulated and emerging mycotoxins.

Entrepreneurs and Burnout. How Hardy Pesonality works in this process

2021 ◽  
pp. 003329412199697
Author(s):  
Laura Quiun ◽  
Marta Herrero ◽  
Maria del Carmen Yeo Ayala ◽  
Bernardo Moreno-Jiménez
Keyword(s):  
Emotional Exhaustion ◽  
Descriptive Analysis ◽  
Working Hours ◽  
Burnout Syndrome ◽  
Hierarchical Regression ◽  
Occupational Factors ◽  
Low Levels ◽  
And Performance ◽  
The Impact ◽  
The Relationship

Background Considering the importance of entrepreneurship and the impact of burnout on workers’ health, this study aims to explore the presence of burnout in entrepreneurs and the interaction of hardy personality (HP) in this process. Method The sample included 255 Spanish entrepreneurs. Occupational factors, working hours, labour immersion, HP, burnout syndrome (i.e. Emotional exhaustion, Depersonalization and Lack of accomplishment) and burnout consequences were assessed. Results Descriptive analysis showed that entrepreneurs had low levels of occupational factors, burnout syndrome and consequences. Hierarchical regression exploratory results indicated that working hours, labour immersion, and Emotional exhaustion were the most relevant predictors of the consequences. Besides, mediation models with PROCESS macro (v.3.0) highlighted the indirect effect of occupational factors and showed that emotional exhaustion was the only component of burnout that mediated in between the predictors and the consequences. As well, HP moderated the relationship between occupational factors and emotional exhaustion. Conclusions Occupational factors are the main predictor of burnout in entrepreneurs and HP could prevent their effect on Emotional exhaustion. The results suggest the importance of training to promote HP for better health and performance of entrepreneurs.

When do job insecure employees adapt to change?

2019 ◽  
Vol 25 (3) ◽  
pp. 271-286 ◽  
Author(s):  
Kristi N. Lavigne ◽  
Victoria L. Whitaker ◽  
Dustin K. Jundt ◽  
Mindy K. Shoss
Keyword(s):  
Job Insecurity ◽  
Small Sample ◽  
Adaptive Performance ◽  
Work Behaviors ◽  
Content Type ◽  
Work Tasks ◽  
Main Effect ◽  
Low Levels ◽  
The Impact ◽  
The Relationship

Purpose The purpose of this paper is to examine the relationship between job insecurity and adaptive performance (AP), contingent on changes to core work tasks, which we position as a situational cue to employees regarding important work behaviors. Design/methodology/approach Employees and their supervisors were invited to participate in the study. Supervisors were asked to provide ratings of employees’ AP and changes to core tasks; employees reported on job insecurity. Findings As predicted, changes to core tasks moderated the relationship between job insecurity and AP. Job insecurity was negatively related to AP for those experiencing low levels of change, but was not related to AP for those experiencing high levels of change. Counter to expectations, no main effect of job insecurity was found. Research limitations/implications This study employed a fairly small sample of workers from two organizations, which could limit generalizability. Practical implications The study identifies changes to core tasks as a boundary condition for the job insecurity–AP relationship. Findings suggest that organizations may not observe deleterious consequences of job insecurity on AP when changes to core tasks are high. Originality/value Few researchers have examined boundary conditions of the impact of job insecurity on AP. Furthermore, inconsistent findings regarding the link between job insecurity and AP have emerged. This study fills the gap and expands upon previous research by examining changes to core tasks as a condition under which job insecurity does not pose an issue for AP.

Cold tolerance of the Antarctic springtail Gomphiocephalus hodgsoni (Collembola, Hypogastruridae)

2001 ◽  
Vol 13 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Brent J. Sinclair ◽  
Heidi Sjursen
Keyword(s):  
Cold Tolerance ◽  
Thermal Environment ◽  
Strong Relationship ◽  
Dry Weight ◽  
Glycerol Content ◽  
Recrystallization Inhibition ◽  
Low Levels ◽  
Inhibition Studies ◽  
The Antarctic ◽  
The Relationship

Cold tolerance of the springtail Gomphiocephalus hodgsoni Carpenter (Collembola: Hypogastruridae) was studied at Cape Bird, Ross Island, Antarctica (77°13′S, 166°26′E). Microclimate temperatures indicate a highly seasonal thermal environment, with winter minima <–39°C. Snow cover significantly buffers both minimum temperatures and cooling rates. Gomphiocephalus hodgsoni survives low temperatures by avoiding freezing. Mean low group supercooling points (SCPs) ranged from –35.4°C in October to –28.3°C in January. The lowest SCP measured was –38.0°C. The high SCP group was very small, making up only 18% of the population in January. In October, G. hodgsoni had a very high glycerol content (>80 μg mg−1 dry weight), although this declined rapidly to low levels (c. 7–10 μg mg−1 dry weight) in January. Quantities of glucose and trehalose were low during October, but steadily increased throughout the summer. Haemolymph osmolality was exceptionally high (up to 1755 mOsm kg−1) at the end of November, but this rapidly declined to c. 500 mOsm kg−1 by late December. The presence of thermal hystersis proteins was indicated by both osmometry on haemolymph samples and recrystallization inhibition studies of springtail homogenates. There was a strong relationship between glycerol content and SCP, but the relationship between haemolymph osmolality, SCP and carbohydrates is uncertain.

CHANGES IN ALPHA- AND BETA-AMYLASE ACTIVITIES DURING THE MATURATION OF DIFFERENT BARLEY CULTIVARS

1971 ◽  
Vol 51 (6) ◽  
pp. 469-477 ◽  
Author(s):  
D. E. LaBERGE ◽  
A. W. MacGREGOR ◽  
W. O. S. MEREDITH
Keyword(s):  
Dry Matter ◽  
Amylase Activity ◽  
Kernel Weight ◽  
Kernel Development ◽  
Barley Cultivars ◽  
Low Levels ◽  
Days After Anthesis ◽  
Unfavorable Weather

The percentage of dry matter, kernel weight, α-amylase activity and β-amylase activity, were determined at several stages of kernel development, from anthesis to harvest, in seven cultivars of Canadian barley. These included 6-row barleys (Conquest, Bonanza, and Keystone), 2-row barleys (Betzes and Centennial), and two 6-rowed selections from crosses between 2-row and 6-row barleys. The patterns for development of β-amylase enzymes were similar in all cultivars, and these activities were low initially, followed by a period of increasing activities commencing about 10 days after anthesis and reaching maximum values 20 days later; they then remained constant until the kernels were harvested. α-Amylase activity increased in all cultivars immediately after anthesis and then decreased to low levels after 10 days of kernel development. The α-amylase activities of Conquest, Bonanza, and Betzes increased again to quite high levels after maturity and just prior to delayed harvesting, owing to unfavorable weather that caused sprouting in these cultivars.

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