Estimation of Reproductive Rates of Burrowing Owls

2003 ◽  
Vol 67 (3) ◽  
pp. 493 ◽  
Author(s):  
Leah R. Gorman ◽  
Daniel K. Rosenberg ◽  
Noelle A. Ronan ◽  
Katherin L. Haley ◽  
Jennifer A. Gervais ◽  
...  
Keyword(s):  
Burrowing Owls ◽  
Reproductive Rates

Diurnal Time Budget of Burrowing Owls in a Resident Population During the Non-Breeding Season

2008 ◽  
Vol 53 (1) ◽  
pp. 29-33 ◽  
Author(s):  
David H. LaFever ◽  
Kristin E. LaFever ◽  
Daniel H. Catlin ◽  
Daniel K. Rosenberg
Keyword(s):  
Breeding Season ◽  
Time Budget ◽  
Resident Population ◽  
Burrowing Owls

Comparative demography of increasing and stable populations of blue grouse (Dendragapus obscurus)

1975 ◽  
Vol 53 (1) ◽  
pp. 1-11 ◽  
Author(s):  
J. A. Redfield
Keyword(s):  
Mortality Rates ◽  
Demographic Characteristics ◽  
Dendragapus Obscurus ◽  
Comparative Demography ◽  
Reproductive Rates ◽  
Stable Populations

The demographic characteristics of an increasing population of blue grouse were studied from 1968 to 1971. Increasing populations of grouse had high reproductive rates and slightly higher than average mortality rates among females as compared to stable populations.

scholarly journals The emergence of rabbit haemorrhagic disease virus: will a non-pathogenic strain protect the UK?

2001 ◽  
Vol 356 (1411) ◽  
pp. 1087-1095 ◽  
Author(s):  
P.J. White ◽  
R.A. Norman ◽  
R.C. Trout ◽  
E.A. Gould ◽  
P.J. Hudson
Keyword(s):  
Disease Virus ◽  
Pathogenic Strain ◽  
Rabbit Haemorrhagic Disease Virus ◽  
Rabbit Haemorrhagic Disease ◽  
Seroprevalence Data ◽  
Age Structured ◽  
Reproductive Rates ◽  
The Uk ◽  
Haemorrhagic Disease ◽  
Age Structured Model

Rabbit haemorrhagic disease virus emerged in China in 1984, and has killed hundreds of millions of wild rabbits in Australia and Europe. In the UK there appears to be an endemic non–pathogenic strain, with high levels of seroprevalence being recorded, in the absence of associated mortality. Using a seasonal, age–structured model we examine the hypothesis that differences in rabbit population demography differentially affect the basic reproductive rates ( R 0 ) of the pathogenic and non–pathogenic strains, leading to each dominating in some populations and not others. The strain with the higher R 0 excluded the other, with the dynamics depending upon the ratio of the two R 0 values. When the non–pathogenic strain dominated, the pathogenic strain caused only transient mortality, although this could be significant when the two R 0 values were similar. When the pathogenic strain dominated, repeated epidemics led to host eradication. Seroprevalence data suggest that the non–pathogenic strain may be protecting some, but not all UK populations, with half being ‘at risk’ from invasion by the pathogenic strain and a fifth prone to significant transient mortality. We identify key questions for empirical research to test this prediction.

Biophobia breeds unparsimonious exceptionalism

2009 ◽  
Vol 32 (3-4) ◽  
pp. 279-280
Author(s):  
Steven J. C. Gaulin
Keyword(s):  
Sexual Selection ◽  
Evolutionary Model ◽  
Reproductive Rates

AbstractWith respect to aggressiveness it is not enough to say that humans are “like other mammals.” We resemble only those species where males have higher maximum reproductive rates than females. In such species males evolve a set of hormonally mediated competitive traits via sexual selection. Because humans match the predictions of this general evolutionary model, attempts to (re)explain men's aggressiveness in sociological terms are superfluous and misleading.

scholarly journals Population dynamics of the threatened Cumberland Sound beluga (Delphinapterus leucas) population

2020 ◽  
Author(s):  
Cortney Watt ◽  
Marianne Marcoux ◽  
Steven H. Ferguson ◽  
Mike Hammill ◽  
Cory Matthews
Keyword(s):  
Scientific Evidence ◽  
Marine Ecosystem ◽  
Ecological Integrity ◽  
Beluga Whale ◽  
Delphinapterus Leucas ◽  
Commercial Harvest ◽  
Abundance Estimates ◽  
Long Term Trends ◽  
Cumberland Sound ◽  
Reproductive Rates

Current scientific evidence indicates the threatened Cumberland Sound beluga (Delphinapterus leucas) population is genetically differentiated and spatially segregated from other beluga whale populations. This population has been hunted for subsistence for centuries by Inuit who now live in the community of Pangnirtung, Nunavut, Canada, and was harvested commercially from 1860 until 1966. The commercial harvest removed at least 10,000 individuals from the population. Visual and photographic aerial surveys were flown during August 2014 and 2017 and produced beluga whale abundance estimates of 1,151 (CV = 0.214; 95% Confidence Interval [CI] = 760-1,744) and 1,381 (CV = 0.043; CI = 1,270-1,502), respectively. Long-term trends in abundance were examined by fitting a Bayesian surplus-production population model to a time series of abundance estimates (n = 5), flown between 1990 and 2017, taking into account reported subsistence harvests (1960-2017). The model suggests the population is declining. Engaged co-management of the Cumberland Sound beluga population and information on demographic parameters, such as reproductive rates, and age and sex composition of the harvest, are needed to restore the ecological integrity of the Cumberland Sound marine ecosystem.

Sign in / Sign up

Export Citation Format

Share Document