scholarly journals Functional relationship between group size and population density in Northwest Atlantic seabirds

2011 ◽  
Vol 435 ◽  
pp. 225-233 ◽  
Author(s):  
G Beauchamp
Keyword(s):  
Population Density ◽  
Group Size ◽  
Functional Relationship ◽  
Northwest Atlantic

scholarly journals Instantaneous areal population density of entire Atlantic cod and herring spawning groups and group size distribution relative to total spawning population

2018 ◽  
Vol 20 (2) ◽  
pp. 201-213 ◽  
Author(s):  
Nicholas C. Makris ◽  
Olav Rune Godø ◽  
Dong Hoon Yi ◽  
Gavin J. Macaulay ◽  
Ankita D. Jain ◽  
...  
Keyword(s):  
Population Density ◽  
Size Distribution ◽  
Group Size ◽  
Atlantic Cod ◽  
Group Size Distribution

Variability in Grouping in the Eastern Grey Kangaroo, Macropus giganteus I. Group Density and Group Size

1984 ◽  
Vol 11 (3) ◽  
pp. 423 ◽  
Author(s):  
CJ Southwell
Keyword(s):  
Seasonal Variation ◽  
Population Density ◽  
Group Size ◽  
Spatial Dispersion ◽  
Population Densities ◽  
Forest Habitat ◽  
Open Forest ◽  
Grey Kangaroo ◽  
Group Density ◽  
The Relationship

The effects of season, population density and habitat on group density and group size in the eastern grey kangaroo were examined. In an open forest habitat, both group density and group size increased significantly with population density, but no seasonal variation was detected for either parameter. The relationship with population density was logarithmic for group density and exponential for group size. In a tall shrubland habitat both group density and group size increased with population density, but the range of population densities sampled was too narrow for the nature of the relationships to be determined. Group density was significantly higher, and group size significantly lower, in the tall shrubland than in the open forest. Possible reasons for this difference in spatial dispersion between habitats are discussed.

scholarly journals Plant population is the function of grain yield of maize

2021 ◽  
pp. 103-107
Author(s):  
Mian MAK ◽  
Kakon SS ◽  
Zannat ST ◽  
Begum AA
Keyword(s):  
Population Density ◽  
Grain Yield ◽  
Functional Relationship ◽  
Functional Model ◽  
Plant Population ◽  
Rabi Season ◽  
Area Index ◽  
Good Consistency ◽  
Plant Population Density ◽  
Hybrid Maize

A field experiment on hybrid maize with different plant population density was conducted at the Agronomy field of BARI, Joydebpur, Gazipur during the consecutive rabi season of 2019-2020 and 2020-2021. Five plant population density viz; T1= 66666 plants/ha (75cm × 20cm spacing: 6.67 plants/m2), T2= 83333 plants/ha (60cm × 20cm spacing:8.33 plants/m2), T3=100000 plants/ha (50cm × 20cm spacing:10 plants/m2), T4=125000 plants/ha (40cm × 20cm spacing:12.5 plants/m2) and T5=166666 plants/ha (30cm × 20cm spacing:16.67 plants/m2) were used in the experiment. LAI (leaf area index) and TDM (total dry matter) increased with the increase of plant population, those influenced grain yield of maize. The highest grain yield (10.12-10.78 t/ha) was recorded in T3 (100000 plants/ha) and the lowest (5.02-5.33t/ha) in T5 (166666 plants/ha) treatment. Functional relationship between plant population and grain yield of maize was established as Y = 2.0795x-0.1067x2; (R² = 0.92). The effect of plant population on the grain yield of maize could be explained 92% by the functional model. The co- efficient indicated that increase of one plant/m2 would increase grain yield at the rate of 2.0795 t/ha up to a certain limit. The estimated optimum plant population was 9.74 plants/m2 (974000 plants/ha) through functional model. Then the predicted maximum grain yield would be 10.13 t/ha at that optimum plant population of 9.74 plants/m2 (974000 plants/ha). There existed a good consistency between observed and predicted grain yield of maize (r=0.96 at p<0.01 and R2=0.97; using the developed functional model).

TIP DAMAGE AS AN INDEX OF NANTUCKET PINE TIP MOTH POPULATION DENSITY (LEPIDOPTERA: TORTRICIDAE)

1978 ◽  
Vol 110 (9) ◽  
pp. 917-920 ◽  
Author(s):  
F. M. Stephen ◽  
G. W. Wallis
Keyword(s):  
Population Density ◽  
Functional Relationship ◽  
Tree Age ◽  
Moth Population ◽  
X Ray ◽  
Linear Relationships ◽  
Nantucket Pine Tip Moth ◽  
Rhyacionia Frustrana

AbstractIn order to establish a functional relationship between damaged pine tips apparently infested with Nantucket pine tip moth, Rhyacionia frustrana (Comstock), and within-tip larval and pupal population, X-ray techniques were used to determine numbers of actually infested tips and the numbers of tip moth immatures contained therein. Linear relationships existed between these variables and changes in tip moth density. The effect of different plantations, tip moth generations, season, and tree age did not significantly alter the observed relationships. Approximately 40% of the damaged (i.e. apparently infested) tips were actually infested, and these tips contained an average of 1.4 tip moth immatures per tip. The equation Y = −.509 +.57X estimates the number of tip moth immatures, given the number of apparently damaged tips per tree (r2 =.71).

Mangabey (Cercocebus albigena) population density, group size, and ranging: A twenty-year comparison

1994 ◽  
Vol 32 (3) ◽  
pp. 197-205 ◽  
Author(s):  
William Olupot ◽  
Colin A. Chapman ◽  
Charles H. Brown ◽  
Peter M. Waser
Keyword(s):  
Population Density ◽  
Group Size

scholarly journals Status of blue sheep and Himalayan tahr in Dhorpatan Hunting Reserve, Nepal

2013 ◽  
Vol 21 (1) ◽  
pp. 25-30 ◽  
Author(s):  
JB Karki ◽  
BB Thapa
Keyword(s):  
Population Density ◽  
Sex Ratio ◽  
Group Size ◽  
Blue Sheep ◽  
Average Group ◽  
Hemitragus Jemlahicus ◽  
The Mean ◽  
Pseudois Nayaur ◽  
Himalayan Tahr ◽  
Average Group Size

A survey of blue sheep (Pseudois nayaur) was conducted in six blocks of Dhorpatan Hunting Reserve (DHR), Nepal. A total of 852 blue sheep were recorded in 73 different groups. The average group size was found to be 11.7 individuals. The average population density of blue sheep in the reserve was found to be 1.28 animals per km2. There were 263 rams, 307 ewes, 89 yearlings and 39 lambs. Among the rams, 126 were classified as trophy rams, 92 as medium rams and 45 as young rams. The ratio of trophy rams to other rams was found to be higher than those found in the earlier studies. The mean sex ratio was 86 males per 100 females and the yearling to ewes ratio was 29 per 100 ewes. The survey of Himalayan tahr (Hemitragus jemlahicus) in Sundaha block recorded 53 individuals with 30 males, 14 females, eight yearlings, and one lamb. The results indicated that the existing quota of blue sheep hunting can be safely continued. In case of higher demands, two more quotas can be added to Barse, Dogadi and Sundaha blocks for the next five years (2008-2012). Himalayan tahrs can be hunted in all the blocks. Sundaha block can sustain four while the rest of the blocks can sustain two Himalayan tahrs per year. DOI: http://dx.doi.org/10.3126/banko.v21i1.9060 Banko Janakari, Vol. 21, No. 1 2011; 25-30

scholarly journals Population status, distribution and potential threats of the Blue Bull Boselaphus tragocamelus (Mammalia: Cetartiodactyla: Bovidae) along the Tinau River of Rupandehi District, Nepal

2016 ◽  
Vol 8 (14) ◽  
pp. 9638 ◽  
Author(s):  
Mohan Aryal ◽  
Saroj Panthi ◽  
Manoj Bhatta ◽  
Thakur Prasad Magrati ◽  
Ashok Kumar Shrestha ◽  
...  
Keyword(s):  
Population Density ◽  
Sex Ratio ◽  
Group Size ◽  
Habitat Destruction ◽  
Population Status ◽  
Average Population Density ◽  
Average Population ◽  
Average Group ◽  
The Status ◽  
Average Group Size

The status and conservation of the Blue Bull Boselaphus tragocamelus is becoming one of the prominent discourses of wildlife research.  The study was carried out along the Tinau River at Rupandehi District in western Nepal to ascertain the population status, distribution and potential threats to the Blue Bull.  The study was conducted along six transect lines in the forest.  A total of 40 Blue Bulls were recorded in different transects.  The average group size was five.  The average population density was 0.228 Blue Bulls per ha and the sex ratio was 1 male: 3 females.  The potential threats of the Blue Bull along the Tinau River were habitat destruction, overgrazing, conflict, flooding and accident.  

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