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

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.

Estimating recruitment from capture–recapture data by modelling spatio‐temporal variation in birth and age‐specific survival rates

2018 ◽  
Vol 9 (10) ◽  
pp. 2115-2130 ◽  
Author(s):  
Richard B. Chandler ◽  
Kristin Engebretsen ◽  
Michael J. Cherry ◽  
Elina P. Garrison ◽  
Karl V. Miller
Keyword(s):  
Temporal Variation ◽  
Survival Rates ◽  
Capture Recapture ◽  
Spatio Temporal

scholarly journals Temporal and spatial variation in age-specific survival rates of a long-lived mammal, the Hawaiian monk seal

2006 ◽  
Vol 274 (1608) ◽  
pp. 407-415 ◽  
Author(s):  
Jason D Baker ◽  
Paul M Thompson
Keyword(s):  
Survival Rates ◽  
Adult Survival ◽  
Age Classes ◽  
Temporal And Spatial Variation ◽  
Monachus Schauinslandi ◽  
Breeding Sites ◽  
Capture Recapture ◽  
Temporal And Spatial ◽  
Spatio Temporal ◽  
Monk Seals

Estimates of variability in pinniped survival rates are generally based on observations at single sites, so it is not certain whether observed rates represent the whole population. Here, we provide a comprehensive analysis of spatio-temporal variation in age-specific survival rates for endangered Hawaiian monk seals ( Monachus schauinslandi ) based on capture–recapture analyses of more than 85% of the pups weaned in this population over the last two decades. Uniquely, these data have been collected from six subpopulations, encompassing all major breeding sites across its 1800 km long core range. Analyses of individual subpopulations revealed similar patterns in age-specific survival, characterized by the relatively low survival rates from weaning to 2 years of age, intermediate rates to 4 years of age, and then by relatively high ‘mature’ survival rates until 17 years of age, after which a senescent decline was observed. Juvenile, subadult and adult survival rates all varied significantly over time. Trends in survival among subpopulations were coherent with their relative geographical positions, suggesting regional structuring and connectedness within the archipelago. Survival rates for different age classes tended to be positively correlated, suggesting that similar factors may influence the survival for seals of all ages.

scholarly journals Demographic consequences of climate variation along an elevational gradient for a montane terrestrial salamander

2017 ◽  
Author(s):  
Nicholas M. Caruso ◽  
Leslie J. Rissler
Keyword(s):  
Survival Rates ◽  
Elevational Gradient ◽  
Vital Rates ◽  
Life History Variation ◽  
Growth And Survival ◽  
Active Season ◽  
Asymptotic Size ◽  
Capture Recapture ◽  
Survival And Growth ◽  
The Relationship

AbstractClimate change represents a significant threat to amphibians, which are already imperiled. However, for many species, the relationship between demographic vital rates (survival and growth) and climate is unknown, which limits predictive models. Here we describe the life history variation ofPlethodon montanususing capture-recapture data over a period of four years, at five sites along an elevational gradient to determine how survival and growth vary with temperature, precipitation, and how these relationships vary with elevation. We used a hierarchical model to estimate asymptotic size and growth rate, and used a spatial Cormack-Jolly-Seber model to estimate probability of capture and survival, as well as dispersal variance. Our results show that during the active season, growth and survival rates are both positively affected by precipitation, while survival was positively affected by temperature at all elevations, the relationship between growth rates and temperature varied along the elevational gradient. Generally at lower elevations, higher temperatures led to a decrease in growth while at higher elevations the opposite was true. During the inactive season we found elevational variation in the relationship between survival and the amount of snow; at low elevations snowfall was low but survival decreased with increasing snowfall while at higher elevations increasing snowfall lead to higher survival. Our results demonstrate that understanding how the environment can affect salamander demography to develop mechanistic models, will require knowledge of the actual environmental conditions experienced by a given population as well as an understanding of the overall differences in climate at a given site.

scholarly journals Age-Dependent Decline in Salinity Tolerance in a Euryhaline Fish

2021 ◽  
Vol 2 ◽  
Author(s):  
Mayu Inokuchi ◽  
Yoko Yamaguchi ◽  
Benjamin P. Moorman ◽  
Andre P. Seale
Keyword(s):  
Environmental Control ◽  
Survival Rates ◽  
Age Related ◽  
Acclimation Period ◽  
Wide Range ◽  
Osmotic Homeostasis ◽  
Age Dependent ◽  
Euryhaline Teleost ◽  
Salinity Challenge ◽  
Effect Of Age

Euryhaline teleost fish are characterized by their ability to tolerate a wide range of environmental salinities by modifying the function of osmoregulatory cells and tissues. In this study, we experimentally addressed the age-related decline in the sensitivity of osmoregulatory transcripts associated with a transfer from fresh water (FW) to seawater (SW) in the euryhaline teleost, Mozambique tilapia, Oreochromis mossambicus. The survival rates of tilapia transferred from FW to SW were inversely related with age, indicating that older fish require a longer acclimation period during a salinity challenge. The relative expression of Na+/K+/2Cl− cotransporter 1a (nkcc1a), which plays an important role in hyposmoregulation, was significantly upregulated in younger fish after SW transfer, indicating a clear effect of age in the sensitivity of branchial ionocytes. Prolactin (Prl), a hyperosmoregulatory hormone in O. mossambicus, is released in direct response to a fall in extracellular osmolality. Prl cells of 4-month-old tilapia were sensitive to hyposmotic stimuli, while those of >24-month-old fish did not respond. Moreover, the responsiveness of branchial ionocytes to Prl was more robust in younger fish. Taken together, multiple aspects of osmotic homeostasis, from osmoreception to hormonal and environmental control of osmoregulation, declined in older fish. This decline appears to undermine the ability of older fish to survive transfer to hyperosmotic environments.

scholarly journals High frequency of social polygyny reveals little costs for females in a songbird

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Simone Santoro ◽  
Pilar Fernández-Díaz ◽  
David Canal ◽  
Carlos Camacho ◽  
László Z. Garamszegi ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Survival Rates ◽  
Central Spain ◽  
Pair Bonds ◽  
Rearing Conditions ◽  
Capture Recapture ◽  
Males And Females ◽  
The Difference ◽  
The Cost

AbstractMating system theory predicts that social polygyny—when one male forms pair bonds with two females—may evolve by female choice in species with biparental care. Females will accept a polygynous male if the benefit of mating with a male providing high-quality genes or rearing resources outweighs the cost of sharing mate assistance in parental care. Based on this rationale, we hypothesise that the population frequency of social polygyny (FSP) varies due to changes in mate sharing costs caused by changing environmental conditions. We predicted that: (1) polygamous females (i.e. mated with a polygynous male) pay a survival cost compared to monogamous females; (2) FSP would be higher in years with better rearing conditions and (3) the difference in survival rates between monogamous and polygamous females would be small following years with higher FSP. We tested these predictions using regression and multistate analyses of capture-recapture data of pied flycatchers, Ficedula hypoleuca, in central Spain collected over 26 years (1990–2016). Monogamous females had a higher mean survival rate than polygamous females (prediction 1), but there was no difference in survival between polygynous and monogamous males. In addition, FSP was positively associated with annual reproductive success (a proxy of the quality of rearing conditions—prediction 2). Finally, following years with high FSP, the survival of polygamous females was similar to that of monogamous females (prediction 3), while the chance of breeding in a polygamous state for 2 years in a row increased for both males and females. Our findings suggest that fluctuating environmental conditions may be a necessary but neglected aspect of understanding social polygyny mechanisms.

Survival of Alytes cisternasii tadpoles in stream pools: a capture-recapture study using photo-identification

2011 ◽  
Vol 32 (3) ◽  
pp. 365-374 ◽  
Author(s):  
Joana Ribeiro ◽  
Rui Rebelo
Keyword(s):  
Survival Rates ◽  
Larval Survival ◽  
Life Cycles ◽  
Life History Stage ◽  
High Survival ◽  
Amphibian Population ◽  
Photo Identification ◽  
Temporary Stream ◽  
Capture Recapture ◽  
First Time

AbstractFor amphibians with complex life cycles, the regulation of populations may occur in each life history stage and although available data stress the importance of studying amphibian population dynamics during the larval stage, most studies so far still focus only on the adult phase, due to the difficulty to estimate larval survival under field conditions. Through a two-months capture-recapture study of 646 photo-identified tadpoles of Alytes cisternasii we aimed to estimate tadpole survival in isolated temporary stream pools – their main habitat – as well as to evaluate how pool characteristics and intraspecific competition (tadpole density) affect this parameter. Photo-identification was performed with the help of the software I3S. We used the POPAN formulation of the Jolly-Seber model to estimate survival rates and population size in 9 stream pools. Tadpole density varied from ∼1 to 40 tadpoles · m–2. Tadpole weekly survival was relatively high, varying from 75 to 99% · week–1. Among-pool differences in survival were best explained by pool depth, and not by tadpole density or other pool characteristics. The lower survival estimates were obtained for the deep pools. The very high survival estimates for some pools are an indication that this type of discrete habitat may play an important role for this species. To our knowledge, this is the first time that photo-identification is used to obtain estimates for survival and density of tadpoles.

Comment on “Are survival rates for northern spotted owls biased?”Appears in Can. J. Zool. 83: 1386–1390.

2006 ◽  
Vol 84 (9) ◽  
pp. 1375-1379 ◽  
Author(s):  
A.B. Franklin ◽  
J.D. Nichols ◽  
R.G. Anthony ◽  
K.P. Burnham ◽  
G.C. White ◽  
...  
Keyword(s):  
Population Change ◽  
Survival Rates ◽  
Negative Bias ◽  
Strix Occidentalis ◽  
Spotted Owls ◽  
Strix Occidentalis Caurina ◽  
Capture Recapture ◽  
Northern Spotted Owls ◽  
Biased Estimates

Loehle et al. recently estimated survival rates from radio-telemetered northern spotted owls ( Strix occidentalis caurina (Merriam, 1898)) and suggested that survival rates estimated for this species from capture–recapture studies were negatively biased, which subsequently resulted in the negatively biased estimates of rates of population change (λ) reported by Anthony et al. (Wildl. Monogr. No. 163, pp. 1–47 (2006)) . We argue that their survival estimates were inappropriate for comparison with capture–recapture estimates because (i) the manner in which they censored radio-telemetered individuals had the potential to positively bias their survival estimates, (ii) their estimates of survival were not valid for evaluating bias, and (iii) the size and distribution of their radiotelemetry study areas were sufficiently different from capture–recapture study areas to preclude comparisons. In addition, their inferences of negative bias in rates of population change estimated by Anthony et al. were incorrect and reflected a misunderstanding about those estimators.

scholarly journals Comparing the effects of release methods on survival of the Eurasian black vulture Aegypius monachus reintroduced in France

Oryx ◽  
2013 ◽  
Vol 48 (1) ◽  
pp. 106-115 ◽  
Author(s):  
Jean-Baptiste Mihoub ◽  
Karine Princé ◽  
Olivier Duriez ◽  
Philippe Lécuyer ◽  
Bertrand Eliotout ◽  
...  
Keyword(s):  
Survival Rates ◽  
Population Viability ◽  
Artificial Nests ◽  
Viability Analysis ◽  
Tag Loss ◽  
Black Vulture ◽  
In The Wild ◽  
Capture Recapture ◽  
Similar Survival ◽  
Event Capture

AbstractThe Near Threatened Eurasian black vulture Aegypius monachus is considered highly threatened in Europe, and the species was reintroduced in France between 1992 and 2004. A total of 53 individuals were released, using two methods: immatures were released from large aviaries at the reintroduction site after a stay of several months (the aviary method), whereas juveniles were placed on artificial nests until fledging (the hacking method). The survival rates of released birds were compared to the survival of wild-born offspring through a multi-event capture–recapture analysis accounting for tag loss. Survival rates were higher in adults than in juveniles and immatures (0.98 ± SE 0.02 vs 0.85 ± SE 0.03) and were constant over time. Overall there were no differences in post-release survival between the two release methods: immatures released by the aviary method had a similar survival to juveniles released by the hacking method or born in the wild. Immatures can breed before juveniles, so releasing immatures by the aviary method could accelerate reintroduction settlement and increase population viability. Accurate estimates of post-release survival are essential to improve the reliability of viability analysis of reintroduced populations and the management of such populations.

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