Factors affecting resource use variation for an abundant coastal fish predator, Lutjanus apodus, in a bahamian wetland system

2012 ◽  
Vol 88 (2) ◽  
pp. 211-230 ◽  
Author(s):  
Caroline M Hammerschlag-Peyer ◽  
Craig A Layman
The Auk ◽  
2007 ◽  
Vol 124 (1) ◽  
pp. 197-209 ◽  
Author(s):  
Kazuya Naoki

Abstract The distribution and abundance of food are primary factors affecting resource-use patterns in birds. Many bird species eat several food types, which may differ in their distribution and overall abundance. I studied foraging ecology of seven sympatric species of Tangara at Mindo, Ecuador, to determine whether the patterns of resource use differed between two food types: arthropods and fruits. Interspecific differences in arthropod-foraging were manifested in the fine segregation of microhabitat preference combined with different habitat use. By contrast, interspecific differences in fruit-foraging were manifested in preferences for different plant genera, often associated with different habitats. No evidence was found for spatial partitioning of the same fruit species. Interspecific overlap in fruit-for- aging was 3× higher than that in arthropod-foraging, and species of Tangara that frequently joined the same mixed-species flocks differed largely in arthropod-foraging but overlapped greatly in fruit-foraging. The differences in patterns between arthropod and fruit-foraging may be explained by the different characteristics of arthropods and fruits as food resources. High sympatry of species of Tangara and other omnivorous tanagers, in general, appears to be maintained not because fruits are abundant, resulting in little competition for them, but because these tanagers specialize on different microhabitats for foraging arthropods. Segregación de Artrópodos como Recurso Alimenticio de Tangaras Omnívoras (Tangara spp.) en el Oeste de Ecuador


2017 ◽  
Vol 15 (1) ◽  
pp. 28-39
Author(s):  
Basanta Kumar Barmon ◽  
Mahfuzul Islam

The present study aimed to estimate the resource use efficiency and identify the factors affecting land allocation for wheat production in Bangladesh. Primary data were randomly collected from 183 wheat producers from three Upzillas of Natore district. The results revealed that farmers had experienced decreasing return to scale in wheat production. Farm area, seed cost and labor cost were the main factors that positively, and irrigation negatively affected wheat production. The sampled farmers failed to show their efficiency in using the resources in wheat cultivation. There was further opportunity to increase wheat production using more seed, chemical fertilizers, manure and pesticides. However, there was no further scope to increase wheat production by using irrigation, land preparation and labor inputs. The study also revealed that farmers’ age, education, wheat farming experience, location and family size significantly affected the probability of land allocation in wheat production. Soil type in the study areas played a vital role in the decision process of wheat cultivation. It could be concluded that proper utilization of inputs can increase wheat in Bangladesh.The Agriculturists 2017; 15(1) 28-39


2008 ◽  
Vol 16 (18) ◽  
pp. 1987-1994 ◽  
Author(s):  
Verónica García ◽  
Eva Pongrácz ◽  
Paul Phillips ◽  
Riitta Keiski

Author(s):  
A. A. Mokropulo

Competitiveness is one of the important factors of sustainable development of enterprise economy. Sustainable economic development economic structure characterizes a complex system of indicators, reflecting the dynamics of economic growth, strengthen financial condition and increase of efficiency of use of the entire set and each type of resource, performance during the reporting period, obligations to employees, other businesses and government. The article identifies the main factors affecting the stability of development of economy of the enterprise, highlighted that sustainable development is a process of change in which resource use, investment, trends of technical development and change of the institutions are implemented in harmony, thereby increasing the potential to meet the needs and aspirations of man.


Medicine ◽  
2017 ◽  
Vol 96 (32) ◽  
pp. e7782 ◽  
Author(s):  
Phunchai Charatcharoenwitthaya ◽  
Ngamphol Soonthornworasiri ◽  
Khemajira Karaketklang ◽  
Kittiyod Poovorawan ◽  
Wirichada Pan-ngum ◽  
...  

Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.


Author(s):  
Christine M. Dannels ◽  
Christopher Viney

Processing polymers from the liquid crystalline state offers several advantages compared to processing from conventional fluids. These include: better axial strength and stiffness in fibers, better planar orientation in films, lower viscosity during processing, low solidification shrinkage of injection moldings (thermotropic processing), and low thermal expansion coefficients. However, the compressive strength of the solid is disappointing. Previous efforts to improve this property have focussed on synthesizing stiffer molecules. The effect of microstructural scale has been overlooked, even though its relevance to the mechanical and physical properties of more traditional materials is well established. By analogy with the behavior of metals and ceramics, one would expect a fine microstructure (i..e. a high density of orientational defects) to be desirable.Also, because much microstructural detail in liquid crystalline polymers occurs on a scale close to the wavelength of light, light is scattered on passing through these materials.


1990 ◽  
Vol 54 (11) ◽  
pp. 638-643 ◽  
Author(s):  
PC Damiano ◽  
ER Brown ◽  
JD Johnson ◽  
JP Scheetz

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