Predictors of Juvenile Survival in Birds

2013 ◽  
Vol 78 (1) ◽  
pp. 1-55 ◽  
Author(s):  
Terri J. Maness ◽  
David J. Anderson
Keyword(s):  
Juvenile Survival

Nature-based tourism impacts on yellow-eyed penguins Megadyptes antipodes: does unregulated visitor access affect fledging weight and juvenile survival?

2004 ◽  
Vol 119 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Maureen R. McClung ◽  
Philip J. Seddon ◽  
M. Massaro ◽  
A.N. Setiawan
Keyword(s):  
Juvenile Survival ◽  
Tourism Impacts

Wing Length and Mass at Fledging Predict Local Juvenile Survival and Age at First Return in Tufted Puffins

The Condor ◽  
2009 ◽  
Vol 111 (3) ◽  
pp. 433-441 ◽  
Author(s):  
Kyle W. Morrison ◽  
J. Mark Hipfner ◽  
Carina Gjerdrum ◽  
David J. Green
Keyword(s):  
Wing Length ◽  
Juvenile Survival

Juvenile survival in common loons Gavia immer: effects of natal lake size and pH

2012 ◽  
Vol 43 (3) ◽  
pp. 280-288 ◽  
Author(s):  
Walter H. Piper ◽  
Jason S. Grear ◽  
Michael W. Meyer
Keyword(s):  
Juvenile Survival ◽  
Gavia Immer ◽  
Common Loons ◽  
Lake Size

scholarly journals Juvenile Survival in a Neotropical Migratory Songbird Is Lower than Expected

PLoS ONE ◽  
2013 ◽  
Vol 8 (2) ◽  
pp. e56059 ◽  
Author(s):  
Matthew I. McKim-Louder ◽  
Jeffrey P. Hoover ◽  
Thomas J. Benson ◽  
Wendy M. Schelsky
Keyword(s):  
Juvenile Survival ◽  
Migratory Songbird

Factors Affecting Juvenile Survival in House Sparrow Passer domesticus

1998 ◽  
Vol 29 (3) ◽  
pp. 241 ◽  
Author(s):  
Thor Harald Ringsby ◽  
Bernt-Erik Saether ◽  
Erling Johan Solberg
Keyword(s):  
House Sparrow ◽  
Passer Domesticus ◽  
Juvenile Survival ◽  
Factors Affecting

scholarly journals Survival rates of adult and juvenile gyrfalcons in Iceland: estimates and drivers

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12404
Author(s):  
Frédéric Barraquand ◽  
Ólafur K. Nielsen
Keyword(s):  
Prey Density ◽  
Survival Rates ◽  
Environmental Drivers ◽  
Juvenile Survival ◽  
Recovery Model ◽  
Mark Recapture ◽  
Weather Effects ◽  
Main Prey ◽  
Positive Effects ◽  
Model Combining

Knowledge of survival rates and their potential covariation with environmental drivers, for both adults and juveniles, is paramount to forecast the population dynamics of long-lived animals. Long-lived bird and mammal populations are indeed very sensitive to change in survival rates, especially that of adults. Here we report the first survival estimates for the Icelandic gyrfalcon (Falco rusticolus) obtained by capture-mark-recapture methods. We use a mark-recapture-recovery model combining live and dead encounters into a unified analysis, in a Bayesian framework. Annual survival was estimated at 0.83 for adults and 0.40 for juveniles. Positive effects of main prey density on juvenile survival (5% increase in survival from min to max density) were possible though not likely. Weather effects on juvenile survival were even less likely. The variability in observed lifespan suggests that adult birds could suffer from human-induced alteration of survival rates.

scholarly journals Juvenile and Adult Survival of Swainson's Thrush (Catharus Ustulatus) in Coastal California: Annual Estimates Using Capture-Recapture Analyses

The Auk ◽  
2003 ◽  
Vol 120 (4) ◽  
pp. 1188-1194
Author(s):  
Thomas Gardali ◽  
Daniel C. Barton ◽  
Jennifer D. White ◽  
Geoffrey R. Geupel
Keyword(s):  
Adult Survival ◽  
Juvenile Survival ◽  
Survival Ratio ◽  
Catharus Ustulatus ◽  
Survival Estimate ◽  
Neotropical Migrant ◽  
Probability Estimates ◽  
Capture Recapture ◽  
Source Sink ◽  
Range Of Values

Abstract We estimated annual rates of survival for juvenile and adult Swainson's Thrushes (Catharus ustulatus) using capture-recapture analyses from 22 years of mist-neting data in coastal California (n= 2,651 individual captures). Our apparent survival estimate was 56% for adults and 25% for juveniles. We are the first to estimate an annual juvenile survival rate for a Neotropical migrant using capture-recapture probability estimates. Like most estimates of annual survival, we could not distinguish between dispersal away from our study area (which is likely high for juveniles) and mortality. Hence, survival is underestimated. However, our juvenile survival estimate did not include the period from fledging to independence, a time when mortality can be high. Many researchers have assumed juvenile survival to be half that of adult survival in population models (e.g. source-sink). Our juvenile to adult survival ratio was 45% (95% CI = 27 to 65%). We caution researchers from simply assuming that juvenile survival approximates half of adult survival when modeling populations and suggest using a range of values. Using a range of values is prudent because of the potential for annual variation, site-specific variation, and especially because estimates are imprecise or completely lacking.

Juvenile survival and recruitment of wood thrushesHylocichla mustelinain a forest fragment

2004 ◽  
Vol 35 (4) ◽  
pp. 316-326 ◽  
Author(s):  
William P. Brown ◽  
Roland R. Roth
Keyword(s):  
Juvenile Survival ◽  
Forest Fragment

Estimating the Juvenile Survival Rate of Male Northern Fur Seals (Callorhinus ursinus)

1989 ◽  
Vol 46 (8) ◽  
pp. 1428-1436 ◽  
Author(s):  
Andrew W. Trites
Keyword(s):  
Survival Rate ◽  
Juvenile Survival ◽  
Callorhinus Ursinus ◽  
Strongly Correlated ◽  
Fur Seals ◽  
Commercial Harvest ◽  
Northern Fur Seals ◽  
Back Calculation ◽  
Number Of Males ◽  
Insight Into

Three methods for estimating the survival rate of juvenile northern fur seals (Callorhinus ursinus) are developed from the earlier works of Chapman, Smith and Polacheck and Lander. Each of the methods I propose divides the estimated number of males alive at 2 yr of age by the estimated number of pups born in their year class. The number of surviving juveniles are reconstructed by back calculation using the number of males killed during the commercial harvest and the subsequent counts of bulls. The three methods differ in their assumptions concerning subadult survival and escapement from the harvest, although all produce similar estimates when applied to the St. Paul Island fur seals. These new estimates of juvenile survival (1950–80) are strongly correlated with the ratio of cohort kill to pup production and with estimates from the currently-used Lander procedure. This is because the harvest morality of males is large compared with natural morality. The new methods perform acceptably over a wider class of data than Lander's. Their greatest advantage over current procedures is that they provide a better insight into the reliability of the survival estimates they produce.

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