scholarly journals Long-term mark-recapture monitoring of a Colorado pikeminnow Ptychocheilus lucius population: assessing recovery progress using demographic trends

2017 ◽  
Vol 34 ◽  
pp. 131-147 ◽  
Author(s):  
DB Osmundson ◽  
GC White
Keyword(s):  
Demographic Trends ◽  
Mark Recapture ◽  
Ptychocheilus Lucius

scholarly journals Arenavirus infection correlates with lower survival of its natural rodent host in a long-term capture-mark-recapture study

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
Joachim Mariën ◽  
Vincent Sluydts ◽  
Benny Borremans ◽  
Sophie Gryseels ◽  
Bram Vanden Broecke ◽  
...  
Keyword(s):  
Rodent Host ◽  
Mark Recapture ◽  
Lower Survival

Establishing A Mark-Recapture Program For Dugongs In Moreton Bay, South-East Queensland

2002 ◽  
Vol 24 (1) ◽  
pp. 51 ◽  
Author(s):  
JM Lanyon ◽  
HL Sneath ◽  
JM Kirkwood ◽  
RW Slade
Keyword(s):  
Mating Strategies ◽  
Clear Water ◽  
Urban Centre ◽  
Mark Recapture ◽  
Moreton Bay ◽  
Yield Information ◽  
Faecal Samples ◽  
Capture Method ◽  
And Gender

This paper reports the commencement of the first mark-recapture program for a dugong (Dugong dugon) population. Moreton Bay, south-east Queensland supported a D. dugon population of more than 800 individuals in 1996 and is close to an urban centre, Brisbane. Several features of this population make a mark-recapture program feasible: a large resident population concentrated over a small and predictable area, a relatively clear water habitat, animals regularly exposed to boating traffic, and an efficient capture method. Fifty-four D. dugon were captured using the ?rodeo? method and tagged. Tags applied included a long-term dorsal PIT tag, a titanium turtle tag, fluke notch and temporary paint stick mark. For each D. dugon, body length, anal girth and gender were recorded. D. dugon were biopsied for genetic (microsatellite) analysis. Faecal samples were obtained for reproductive hormone assays. This program has the potential to yield information on trends in population size and distribution, population dynamics, mating strategies, social structure and general health of the population. This is the first season of a long-term project.

A Decade of Mark-Recapture of Platypuses on The Duckmaloi River: Any New Insights into Population Dynamics?

1998 ◽  
Vol 20 (2) ◽  
pp. 302
Author(s):  
D. Goldney
Keyword(s):  
Sex Ratio ◽  
New South ◽  
First Year ◽  
Mark Recapture ◽  
South Wales ◽  
Adult Status ◽  
Second Year ◽  
Gill Netting ◽  
Population Numbers

A long-term mark-recapture program has been carried out on the Duckmaloi Weir (near Oberon, New south Wales) and associated river over the period 1986 to the present. The pipehead weir creates a long shallow ·pool' about 2.5 ha in area, ideal for gill-netting platypuses. One hundred and eighty-two (182) individual animals have been captured in excess of 500 times. The majority of animals have been captured in the weir pool. A very dynamic situation exists with new adults and juveniles being captured on a regular basis and conversely captured animals "disappearing" on a regular basis from the system. Some individuals exhibit both transience and site attachment characteristics. However, relatively few animals remain site attached for long periods of time. Sixty nine percent of individuals are captured two or fewer times. Band loss cannot account for this phenomenon. Of the captured animals, 11.3% have been caught more than 5 times. The sex ratio of the population favours females in first capture adults (1:1.72) but males in first capture juveniles (1:0.73). Females are more likely to be recaptured than males. The sex ratio of juveniles varies significantly from year to year. The period between recaptures varies greatly and can be up to 6 years. Four animals have been captured over nine years (3 females/1 male) but no animal has been captured every year of the study. Recruitment has occurred at levels able to maintain the current population numbers. Thirty percent of available adults have been found lactating, including second year females. Seventy one percent of first year capture juveniles and 89.9% of first capture adults "disappear" within two years of first capture. Forty two percent of juvenile animals reach adult status before "disappearing".

scholarly journals Survival of Brown Boobies (Sula Leucogaster) at Johnston Atoll: A Long-Term Study

The Auk ◽  
2003 ◽  
Vol 120 (3) ◽  
pp. 811-817
Author(s):  
Jon S. Beadell ◽  
E. A. Schreiber ◽  
Ralph W. Schreiber ◽  
Gary A. Schenk ◽  
Paul F. Doherty
Keyword(s):  
Southern Oscillation ◽  
Adult Survival ◽  
Term Study ◽  
Environmental Fluctuation ◽  
Mark Recapture ◽  
Invariant Model ◽  
Long Term Study ◽  
Sula Leucogaster ◽  
Time Invariant

Abstract Survival of Brown Boobies (Sula leucogaster) at Johnston Atoll was examined over a 17-year period using capture-mark-recapture analysis. Annual adult survival was estimated to be 0.90 ± 0.01 (SE). Variation in survival did not correspond to either local environmental fluctuation or more widespread disturbances associated with El Niño-Southern Oscillation events, and a time-invariant model of survival was best supported by our data. Absence of major oceanographic anomalies in the immediate vicinity of Johnston Atoll may contribute to relatively high and invariant survival in Brown Boobies.

scholarly journals The changing face of the Mediterranean – Land cover, demography and environmental change: Introduction and overview

The Holocene ◽  
2019 ◽  
Vol 29 (5) ◽  
pp. 703-707 ◽  
Author(s):  
Andrew Bevan ◽  
Alessio Palmisano ◽  
Jessie Woodbridge ◽  
Ralph Fyfe ◽  
C Neil Roberts ◽  
...  
Keyword(s):  
Land Cover ◽  
Environmental Change ◽  
Special Issue ◽  
Demographic Trends ◽  
Human Environment ◽  
Research Initiative ◽  
Long Term Trends ◽  
The Mediterranean

This paper introduces a special issue on The Changing Face of the Mediterranean: Land Cover, Demography, and Environmental Change, which brings together up-to-date regional or thematic perspectives on major long-term trends in Mediterranean human–environment relations. Particularly, important insights are provided by palynology to reconstruct past vegetation and land cover, and archaeology to establish long-term demographic trends, but with further significant input from palaeoclimatology, palaeofire research and geomorphology. Here, we introduce the rationale behind this pan-Mediterranean research initiative, outline its major sources of evidence and method, and describe how individual submissions work to complement one another.

Finland's reforms may end period of stagnation

2016 ◽  
Keyword(s):  
Public Debt ◽  
Growth Potential ◽  
Gdp Growth ◽  
Demographic Trends ◽  
Content Type ◽  
Economic Stagnation ◽  
One Year ◽  
Pension Age ◽  
The Eu

Subject Finland's economy. Significance The Finnish economy contracted from 2012 to 2014 and grew by only 0.5% last year. It has been facing both structural and cyclical headwinds and since 2010 three different governments have been unable to jump-start it. However, the current one-year-old Finnish government has staked much of its political capital on various reforms which are expected to lead to a resumption of growth and a slower increase in public debt. Impacts Due to demographic trends, Finland's long-term growth potential is estimated to be below 2%. Prolonged economic stagnation in the EU and Russia is likely to depress export and GDP growth. The pension age in Finland will increase automatically as life expectancy rises, which may be a model for other European countries.

Change-in-ratio density estimator for feral pigs is less biased than closed mark - recapture estimates

2008 ◽  
Vol 35 (7) ◽  
pp. 695 ◽  
Author(s):  
Laura B. Hanson ◽  
James B. Grand ◽  
Michael S. Mitchell ◽  
D. Buck Jolley ◽  
Bill D. Sparklin ◽  
...  
Keyword(s):  
Estimation Method ◽  
Density Estimator ◽  
Density Estimates ◽  
Mark Recapture ◽  
Closed Population ◽  
Feral Pigs ◽  
Open Population ◽  
Detection Probabilities ◽  
Models Comparison

Closed-population capture–mark–recapture (CMR) methods can produce biased density estimates for species with low or heterogeneous detection probabilities. In an attempt to address such biases, we developed a density-estimation method based on the change in ratio (CIR) of survival between two populations where survival, calculated using an open-population CMR model, is known to differ. We used our method to estimate density for a feral pig (Sus scrofa) population on Fort Benning, Georgia, USA. To assess its validity, we compared it to an estimate of the minimum density of pigs known to be alive and two estimates based on closed-population CMR models. Comparison of the density estimates revealed that the CIR estimator produced a density estimate with low precision that was reasonable with respect to minimum known density. By contrast, density point estimates using the closed-population CMR models were less than the minimum known density, consistent with biases created by low and heterogeneous capture probabilities for species like feral pigs that may occur in low density or are difficult to capture. Our CIR density estimator may be useful for tracking broad-scale, long-term changes in species, such as large cats, for which closed CMR models are unlikely to work.

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