Population density effects on longevity

Genetica ◽  
1993 ◽  
Vol 91 (1-3) ◽  
pp. 99-109 ◽  
Author(s):  
Joseph L. Graves ◽  
Laurence D. Mueller
Keyword(s):  
Population Density ◽  
Density Effects

Effects of population density on female and male burrow characteristics in the fiddler crab, Uca bengali Crane, 1975

Crustaceana ◽  
2015 ◽  
Vol 88 (12-14) ◽  
pp. 1283-1299 ◽  
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee
Keyword(s):  
Body Size ◽  
Population Density ◽  
Fiddler Crab ◽  
High Density ◽  
The Other ◽  
Low Density ◽  
Density Effects ◽  
Egg Incubation ◽  
Other Hand ◽  
Males And Females

We examined the effects of population density on body size and burrow characteristics ofUca bengaliCrane, 1975. We predicted that (1) males in high-density areas (HD) should be larger in size and build higher quality burrows than males in low-density areas (LD), and (2) HD females should be larger in size, but build lower quality burrows than LD females, as HD females can find higher numbers of good quality male burrows around them for breeding and egg incubation. Our results showed that males and females in HD were larger in size than those in LD. Since HD males were larger in size, they built higher quality burrows than males in LD. On the other hand, even though LD females were smaller in size than HD ones, they built higher quality burrows than HD females. Our results thus indicate that density effects both body size and burrow characteristics.

scholarly journals Dispersal of the Invasive Pasture Pest Heteronychus arator into Areas of Low Population Density: Effects of Sex and Season, and Implications for Pest Management

2016 ◽  
Vol 7 ◽  
Author(s):  
Sarah Mansfield ◽  
Philippa J. Gerard ◽  
Mark R. H. Hurst ◽  
Richard J. Townsend ◽  
Derrick J. Wilson ◽  
...  
Keyword(s):  
Population Density ◽  
Pest Management ◽  
Density Effects

Path Analyses of Population Density Effects on Short-Season Soybean Yield

2001 ◽  
Vol 93 (1) ◽  
pp. 187-195 ◽  
Author(s):  
Rosalind A. Ball ◽  
Ronald W. McNew ◽  
Earl D. Vories ◽  
Terry C. Keisling ◽  
Larry C. Purcell
Keyword(s):  
Population Density ◽  
Soybean Yield ◽  
Density Effects ◽  
Path Analyses ◽  
Short Season

scholarly journals Temperature and Population Density Effects on Locomotor Activity of Musca domestica (Diptera: Muscidae)

2013 ◽  
Vol 42 (6) ◽  
pp. 1322-1328 ◽  
Author(s):  
T. M. Schou ◽  
S. Faurby ◽  
A. Kjærsgaard ◽  
C. Pertoldi ◽  
V. Loeschcke ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Population Density ◽  
Musca Domestica ◽  
Density Effects

Row cover and population density effects on yield of bell peppers in south coastal British Columbia

1992 ◽  
Vol 72 (3) ◽  
pp. 901-909 ◽  
Author(s):  
M. M. Gaye ◽  
P. A. Jolliffe ◽  
A. R. Maurer
Keyword(s):  
Population Density ◽  
Fruit Size ◽  
Plant Population ◽  
Research Station ◽  
Density Effects ◽  
Row Covers ◽  
Net Returns ◽  
Bell Peppers ◽  
Plant Population Density ◽  
Density Treatment

Row cover and plant population density effects were studied at the Agriculture Canada Research Station, Agassiz, BC in 1988 and 1989. Bell pepper plants (Ace Hybrid) were transplanted into twin rows (0.45 m apart) on raised beds (1.8-m centers) at five population densities of 1.39, 1.85, 2.78, 5.56 and 11.1 plant m−2. For 7 wk in 1988 or 8 wk in 1989, subplots were either covered or not covered with slit clear polyethylene tunnels. A nonlinear regression model was used to define yield-population density responses. Row covers enhanced early and overall yields in 1988 and overall yield in 1989. Vegetative and reproductive yields (kg plant−1) declined with increasing plant population density. Yields were directly related to population density when measured on a land-area basis. Maximum fruit yield (7.9 kg m−2) was obtained at the highest population density. Treatment influences on fruit size were small and did not affect horticultural quality. An economic analysis showed that net returns were greatest with plants grown under row covers at the highest population density.Key words: Capsicum annuum L., field bell peppers, population density, row covers

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