Flight activity ofProstephanus truncatus (Horn) (Coleoptera: Bostrichidae) in relation to population density, resource quality, age, and sex

1996 ◽  
Vol 9 (2) ◽  
pp. 339-351 ◽  
Author(s):  
Henry Y. Fadamiro ◽  
Tristram D. Wyatt ◽  
Martin C. Birch
Keyword(s):  
Population Density ◽  
Flight Activity ◽  
Resource Quality ◽  
Age And Sex

scholarly journals Age- and sex-specific response to population density and sex ratio

2010 ◽  
Vol 21 (2) ◽  
pp. 356-364 ◽  
Author(s):  
A.N. Dreiss ◽  
J. Cote ◽  
M. Richard ◽  
P. Federici ◽  
J. Clobert
Keyword(s):  
Population Density ◽  
Sex Ratio ◽  
Specific Response ◽  
Age And Sex

Model gospodarowania populacją jelenia europejskiego Cervus elaphus L. w Wolińskim Parku Narodowym i na Wyspie Wolin

2018 ◽  
Vol XI ◽  
pp. 81-90
Author(s):  
Adam Mohr ◽  
Antoni Przybylski ◽  
Małgorzata Zimnicka – Pluskota ◽  
Damian Spieczyński
Keyword(s):  
Population Density ◽  
Population Growth ◽  
Cervus Elaphus ◽  
Environmental Conditions ◽  
Red Deer ◽  
Actual State ◽  
Model Population ◽  
Deer Population ◽  
Proposed Model ◽  
Age And Sex

The paper presents the current methods of management and environmental conditions of the functioning of red deer population on the Wolin Island. The inventory carried out in 2014 using the drive census method revealed the prevalence of stags in the population (0.86 hinds/1stag) and the population density of 225 individuals/1,000 hectares of the forest, whereas harvest conducted in this season showed merely 22 individuals/1,000 hectares. In the analysed seasons before the inventory, harvest was also low (about 10% of the probable actual state) and despite harvesting mainly hinds, it did not curb the population growth. In the years 2006 – 2014, the yearly harvest in the largest hunting district fluctuated within the range of 14.5 to 60.5, x̅=27.0 individuals/1,000 hectares (n=9), while in the remaining four smaller population management units, the average yearly harvest amounted to only 0.2 to 9.8 individuals/1,000 hectares (n=9). The realized rate of population growth determined by the method of summer deer observation in 2015 amounted to 42.2% of the hinds number. Applying the simulation of the model population meeting the parameters indicated in the inventory, the researchers calculated and proposed the optimal indicators of harvesting individual age and sex groups. The proposed model of hunting monitoring and management assumes optimization of environmental conditions, structure and size of the actual population within the next 10 years.

Investigating brushtail possum (Trichosurus vulpecula) home-range size determinants in a New Zealand native forest

2017 ◽  
Vol 44 (4) ◽  
pp. 316 ◽  
Author(s):  
K. S. Richardson ◽  
C. Rouco ◽  
C. Jewell ◽  
N. P. French ◽  
B. M. Buddle ◽  
...  
Keyword(s):  
New Zealand ◽  
Population Density ◽  
Home Range ◽  
Disease Transmission ◽  
Home Range Size ◽  
Range Size ◽  
Home Ranges ◽  
Native Forest ◽  
Trichosurus Vulpecula ◽  
Age And Sex

Context The Australian brushtail possums (Trichosurus vulpecula) introduction to New Zealand has exacted a heavy toll on native biodiversity and presented the country with its greatest wildlife reservoir host for bovine tuberculosis (TB). Management efforts to control both possums and TB have been ongoing for decades, and the biology of possums has been studied extensively in Australia and New Zealand over the past 50 years; however, we still do not have a clear understanding of its home-range dynamics. Aims To investigate determinants of home range size by using a uniquely large dataset in the Orongorongo Valley, a highly monitored research area in New Zealand and compare our findings with those of other studies. Methods Possum density was estimated, for subpopulations on four 13-ha cage-trap grids, by the spatially explicit capture–mark–recapture analysis of trapping data from 10 consecutive months. Home ranges were estimated from trap locations using a 100% minimum convex polygon (MCP) method for 348 individuals and analysed with respect to grid, age and sex. Key results Mean (standard error) possum density, estimated as 4.87 (0.19), 6.92 (0.29), 4.08 (0.21) and 4.20 (0.19) ha–1 for the four grids, was significantly negatively correlated with mean MCP home-range size. Grid, age, and the interaction of age and sex were significantly related to home-range size. Older possums had larger home ranges than did younger possums. When ‘juvenile cohort’ and ‘adult cohort’ data were analysed separately, to investigate the significant interaction, males in the ‘adult cohort’ had significantly larger home ranges than did females, with the grid effect still being apparent, whereas neither sex nor grid effects were significant for the ‘juvenile cohort’. Conclusions Our findings indicate that, in addition to density, age and sex are likely to be consistent determinants of possum home-range size, but their influences may be masked in some studies by the complexity of wild-population dynamics. Implications Our findings have strong implications regarding both disease transmission among possums and possum management. The fact that adult males occupy larger home ranges and the understanding that possum home range increases as population density decreases are an indication that males may be the primary drivers of disease transmission in possum populations. The understanding that possum home range increases as population density decreases could be a direct reflection of the ability of TB to persist in the wild that counteracts current management procedures. If individuals, and particularly males, infected with TB can withstand control measures, their ensuing home-range expansion will result in possible bacteria spread in both the expanded area of habitation and new individuals becoming subjected to infection (both immigrant possums and other control survivors). Therefore, managers should consider potential approaches for luring possum males in control operations.

Diurnal time budget of the mouflon (Ovis musimon) on the Kerguelen archipelago: influence of food resources, age, and sex

1997 ◽  
Vol 75 (11) ◽  
pp. 1828-1834 ◽  
Author(s):  
Sébastien Moncorps ◽  
Patrick Boussès ◽  
Denis Réale ◽  
Jean-Louis Chapuis
Keyword(s):  
Population Density ◽  
Time Budget ◽  
Time Budgets ◽  
Population Densities ◽  
Summer Period ◽  
Drastic Reduction ◽  
Influence Of Food ◽  
Ovis Musimon ◽  
Kerguelen Archipelago ◽  
Age And Sex

The population of introduced mouflons on the Kerguelen subantarctic archipelago (Indian Ocean) is characterized by a demographic cycle marked by rapid variations in density. The diurnal time budgets of the different age–sex classes were compared between two consecutive summers separated by a winter with a massive die-off. Following the drastic reduction in population density between 1994 (100–110 individuals/km2) and 1995 (40–50 individuals/km2), mouflons spent less time foraging, while the time devoted to rest did not differ significantly. This difference is explained by an increase in food availability that allowed the animals to become satiated more rapidly. Although the time spent resting did not differ between the two summers, shorter foraging phases may explain the occurrence of a more polymodal rhythm for these two activities when range conditions improved. Our results indicate that even during the summer period of relative food abundance, the diurnal time budget of mouflons is strongly affected by population density. At high population densities, animals may find it more difficult to restore their body condition and reserves, even in summer. This could have contributed to the high mortality rate observed the following winter.

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