Capture-Recapture Models Allowing for Age-Dependent Survival and Capture Rates

Biometrics ◽  
1981 ◽  
Vol 37 (3) ◽  
pp. 521 ◽  
Author(s):  
K. H. Pollock
Keyword(s):  
Age Dependent ◽  
Capture Recapture ◽  
Capture Rates

scholarly journals Age-structured Jolly-Seber model expands inference and improves parameter estimation from capture-recapture data

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0252748
Author(s):  
Nathan J. Hostetter ◽  
Nicholas J. Lunn ◽  
Evan S. Richardson ◽  
Eric V. Regehr ◽  
Sarah J. Converse
Keyword(s):  
Population Dynamics ◽  
Population Growth ◽  
Age Structure ◽  
Growth Rates ◽  
Lifetime Reproductive Success ◽  
Polar Bears ◽  
Population Growth Rates ◽  
Age Dependent ◽  
Capture Recapture ◽  
Age Structured

Understanding the influence of individual attributes on demographic processes is a key objective of wildlife population studies. Capture-recapture and age data are commonly collected to investigate hypotheses about survival, reproduction, and viability. We present a novel age-structured Jolly-Seber model that incorporates age and capture-recapture data to provide comprehensive information on population dynamics, including abundance, age-dependent survival, recruitment, age structure, and population growth rates. We applied our model to a multi-year capture-recapture study of polar bears (Ursus maritimus) in western Hudson Bay, Canada (2012–2018), where management and conservation require a detailed understanding of how polar bears respond to climate change and other factors. In simulation studies, the age-structured Jolly-Seber model improved precision of survival, recruitment, and annual abundance estimates relative to standard Jolly-Seber models that omit age information. Furthermore, incorporating age information improved precision of population growth rates, increased power to detect trends in abundance, and allowed direct estimation of age-dependent survival and changes in annual age structure. Our case study provided detailed evidence for senescence in polar bear survival. Median survival estimates were lower (<0.95) for individuals aged <5 years, remained high (>0.95) for individuals aged 7–22 years, and subsequently declined to near zero for individuals >30 years. We also detected cascading effects of large recruitment classes on population age structure, which created major shifts in age structure when these classes entered the population and then again when they reached prime breeding ages (10–15 years old). Overall, age-structured Jolly-Seber models provide a flexible means to investigate ecological and evolutionary processes that shape populations (e.g., via senescence, life expectancy, and lifetime reproductive success) while improving our ability to investigate population dynamics and forecast population changes from capture-recapture data.

New insight on survivorship of female chamois (Rupicapra rupicapra) from observation of marked animals

1994 ◽  
Vol 72 (4) ◽  
pp. 591-597 ◽  
Author(s):  
A. Loison ◽  
J. M. Gaillard ◽  
H. Houssin
Keyword(s):  
New Zealand ◽  
Survival Rate ◽  
Survival Rates ◽  
Significant Decline ◽  
Time Dependent ◽  
Age Classes ◽  
Rupicapra Rupicapra ◽  
Age Dependent ◽  
Capture Recapture ◽  
Survival Patterns

A population of about 1500 chamois (Rupicapra rupicapra) was monitored in the French Alps between 1985 and 1991 by observing individually marked animals. Data on resighting of marked females were analyzed using capture–recapture models. Resighting probabilities were time dependent and survival rates were age dependent. The annual survival rate was low in juveniles (0.58) and high in adults (0.96). Maturing animals (1.5–3.5 years old) had lower survival rates (0.91) than adults. Older age-classes exhibited no significant decline in survival rates. Survival patterns are compared with those from a previous study in New Zealand, and biological and methodological differences between the two studies are discussed.

Heterogeneous capture rates in low density populations and consequences for capture-recapture analysis of camera-trap data

2010 ◽  
Vol 53 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Bart J. Harmsen ◽  
Rebecca J. Foster ◽  
C. Patrick Doncaster
Keyword(s):  
Camera Trap ◽  
Low Density ◽  
Capture Recapture ◽  
Capture Rates

scholarly journals Combining capture-recapture data and known ages allows estimation of age-dependent survival rates

2018 ◽  
Vol 9 (1) ◽  
pp. 90-99 ◽  
Author(s):  
Tomas Bird ◽  
Jarod Lyon ◽  
Simon Wotherspoon ◽  
Charles Todd ◽  
Zeb Tonkin ◽  
...  
Keyword(s):  
Survival Rates ◽  
Age Dependent ◽  
Capture Recapture

scholarly journals Age–dependent capture–recapture models and unequal time intervals

2019 ◽  
Vol 42 (1) ◽  
pp. 91-98 ◽  
Author(s):  
A. Sanz–Aguilar ◽  
◽  
R. Pradel ◽  
G. Tavecchia ◽  
◽  
...  
Keyword(s):  
Time Intervals ◽  
Age Dependent ◽  
Capture Recapture

Please come again: attractive bait augments recapture rates of capture-naïve snowshoe hares

2020 ◽  
Vol 47 (3) ◽  
pp. 244
Author(s):  
Melanie R. Boudreau ◽  
Jacob L. Seguin ◽  
Sophia G. Lavergne ◽  
Samuel Sonnega ◽  
Lee Scholl ◽  
...  
Keyword(s):  
Sampling Bias ◽  
Field Trials ◽  
Population Demographics ◽  
Trapping Field ◽  
Snowshoe Hares ◽  
Live Trapping ◽  
Capture Recapture ◽  
Trapping Trials ◽  
Repeat Sampling ◽  
Capture Rates

Abstract ContextCapture–recapture sampling is one of the most commonly used methods for monitoring population demographics and is needed in a wide variety of studies where repeat sampling of individuals is desired. Although studies employing capture–recapture methods often assume unbiased sampling, it is well established that inherent capture biases can occur with these methods, including those related to baits. Reducing sources of sampling bias and augmenting recapture reliability is necessary for capture-dependent studies. However, few studies have examined the efficacy of baits on individuals with variable capture experience. AimsTo investigate the use of an attractant-augmented bait in enhancing capture–recapture probabilities for snowshoe hares (Lepus americanus). MethodsTo examine the efficacy of different attractant-augmented bait types, a variety of baits were created, with bait preference tested on a captive hare. Because a strawberry jam-based bait was preferentially consumed (in comparison with other tested baits), the effectiveness of this attractant in enhancing capture–recapture rates was subsequently examined in wild hares, using paired live-trapping field trials (n=6 trials). ResultsLive-trapping trials showed that although overall hare capture rates were not affected by the use of a jam-based bait, recaptures were 33.1% higher in capture-naïve individuals exposed to our attractant. This was not the case for hares with prior capture experience; such hares had an equal likelihood of being recaptured regardless of the bait type used. ConclusionsThe tested attractant improved recapture rates of capture-naïve hares. ImplicationsStudies relying on high recapture rates should use methods that maximise recapture rates wherever possible, including the use of baits that may augment recaptures in capture-naïve animals.

Estimation and effects of tag-misread rates in capture-recapture studies

1999 ◽  
Vol 56 (4) ◽  
pp. 551-559 ◽  
Author(s):  
Carl James Schwarz ◽  
Wayne T Stobo
Keyword(s):  
Simple Model ◽  
Capture Rate ◽  
Capture Recapture ◽  
The Impact ◽  
Biased Estimates ◽  
Capture Rates

Virtually all capture-recapture studies assume that tags are read properly when an animal is captured. However, the animals in resighting studies are often not handled, tags are read at a distance, and misreads can occur. In this paper, we develop a simple model to account for misreads, assess the impact of misreads upon estimates of survival and catchability, and analyze a set of data from resightings of previously branded seals. In general, unless survival, capture, and misread rates are relatively high, most studies have poor power to detect misreads and estimates of survival are not severely biased. Estimates of capture rates will be biased downwards and will tend to estimate the product of the original capture rate and the complement of the misread rate.

Effects of Hyperoxia on Lung Utrastructure

1970 ◽  
Vol 28 ◽  
pp. 26-27
Author(s):  
Gladys Harrison
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Light Microscopy ◽  
Oxygen Effects ◽  
Age Dependent ◽  
The Central Nervous System ◽  
The Subject ◽  
Space Age ◽  
Alveolar Septa ◽  
Extensive Damage

With the advent of the space age and the need to determine the requirements for a space cabin atmosphere, oxygen effects came into increased importance, even though these effects have been the subject of continuous research for many years. In fact, Priestly initiated oxygen research when in 1775 he published his results of isolating oxygen and described the effects of breathing it on himself and two mice, the only creatures to have had the “privilege” of breathing this “pure air”.Early studies had demonstrated the central nervous system effects at pressures above one atmosphere. Light microscopy revealed extensive damage to the lungs at one atmosphere. These changes which included perivascular and peribronchial edema, focal hemorrhage, rupture of the alveolar septa, and widespread edema, resulted in death of the animal in less than one week. The severity of the symptoms differed between species and was age dependent, with young animals being more resistant.

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